Re: [Elecraft] K3 Sub Receiver

[Dave Cole]

I had no idea I could paste the Elecraft PDF files!  THANK YOU!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 1/3/21 1:44 PM, K8TE wrote:

It is a simple process to review firmware updates, and when appropriate, copy
and paste an update into the PDF version of the manual in Acrobat Reader,
and then save that file with the updates.  Then, when one searches for a
question, the annotated manual has both the then (manual's publishing date)
current text plus the updated annotation.

BTW, the "Big Three" do not allow updating their PDF manuals while Elecraft
does.  Thanks Wayne, Eric, and all those who allow this!

RTFM also means keeping the "M" current!  I find that is much easier than
attempting, and sometimes failing, to remember everything, especially those
things I rarely use.

73, Bill, K8TE



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Re: [Elecraft] K3 Sub Receiver

[K8TE]

It is a simple process to review firmware updates, and when appropriate, copy
and paste an update into the PDF version of the manual in Acrobat Reader,
and then save that file with the updates.  Then, when one searches for a
question, the annotated manual has both the then (manual's publishing date)
current text plus the updated annotation.

BTW, the "Big Three" do not allow updating their PDF manuals while Elecraft
does.  Thanks Wayne, Eric, and all those who allow this!

RTFM also means keeping the "M" current!  I find that is much easier than
attempting, and sometimes failing, to remember everything, especially those
things I rarely use.

73, Bill, K8TE



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Re: [Elecraft] K3 Sub Receiver

[Lyn Norstad]

The latest version of the K3 manual (2011) is in its 10th year, and the last
errata sheet was over 5 years ago (2015).

So much for the advantages of online documentation.

73
Lyn, W0LEN


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Saturday, December 26, 2020 12:08 PM
To: John Lemay; 'Elecraft Reflector Reflector'
Subject: Re: [Elecraft] K3 Sub Receiver

John,

To keep up with all the changes, you should read the firmware release 
notes too.  Mark up the manual with that information.

73,
Don W3FPR

On 12/26/2020 12:47 PM, John Lemay wrote:
> Ken
> 
>   
> 
> Thanks for replying quickly.
> 
>   
> 
> I am reading the current (D10 version) manual, but on looking at your
reply
> I decided to check out the errata - and there it is :-
> 
>   
> 
> < Pg. 14 (VFO Tuning Controls): Holding SUB now turns diversity receive
> on/off. To link VFOs, use CONFIG:VFO LNK >
> 
>   
> 
> And it works fine of course.
> 
>   
> 
> It would have saved me hours of head scratching if someone at Elecraft had
> updated the manual .
> 
>   
> 
> John G4ZTR
> 
>   
> 
>   
> 
> From: Ken K6MR [mailto:k...@outlook.com]
> Sent: 26 December 2020 17:29
> To: John Lemay; Elecraft Reflector Reflector
> Subject: RE: [Elecraft] K3 Sub Receiver
> 
>   
> 
> You are reading an old description of the SUB button.  A firmware change
> made the long press of SUB the activation of Diversity.  Linking is done
> through the config menu.
> 
>   
> 
> Ken K6MR
> 
>   
> 
> From: John Lemay <mailto:j...@carltonhouse.eclipse.co.uk>
> Sent: Saturday, December 26, 2020 09:13
> To: Elecraft Reflector Reflector <mailto:elecraft@mailman.qth.net>
> Subject: [Elecraft] K3 Sub Receiver
> 
>   
> 
> Hello all
> 
> I have a K3 with the sub-receiver installed, and working. But .
> 
> The handbook says < Holding SUB links the VFOs (whether the sub
> receiver is on or off). The kHz decimal point of
> VFO B flashes as a reminder. VFO A is the master,
> moving both VFOs in tandem. >
> 
> I cannot get this to work. I can get the sub rx to be on or off (by
tapping
> SUB), and I can get Diversity to work as well (with a long hold of SUB).
> 
> What other settings can there be on the radio that make it impossible to
> select moving both VFO's in tandem ? - which is exactly what I want.
> 
> Thanks, and seasons greetings !
> 
> John G4ZTR
> 
> 
> 
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Re: [Elecraft] K3 Sub Receiver

[Don Wilhelm]

John,

To keep up with all the changes, you should read the firmware release 
notes too.  Mark up the manual with that information.


73,
Don W3FPR

On 12/26/2020 12:47 PM, John Lemay wrote:

Ken

  


Thanks for replying quickly.

  


I am reading the current (D10 version) manual, but on looking at your reply
I decided to check out the errata - and there it is :-

  


< Pg. 14 (VFO Tuning Controls): Holding SUB now turns diversity receive
on/off. To link VFOs, use CONFIG:VFO LNK >

  


And it works fine of course.

  


It would have saved me hours of head scratching if someone at Elecraft had
updated the manual .

  


John G4ZTR

  

  


From: Ken K6MR [mailto:k...@outlook.com]
Sent: 26 December 2020 17:29
To: John Lemay; Elecraft Reflector Reflector
Subject: RE: [Elecraft] K3 Sub Receiver

  


You are reading an old description of the SUB button.  A firmware change
made the long press of SUB the activation of Diversity.  Linking is done
through the config menu.

  


Ken K6MR

  


From: John Lemay <mailto:j...@carltonhouse.eclipse.co.uk>
Sent: Saturday, December 26, 2020 09:13
To: Elecraft Reflector Reflector <mailto:elecraft@mailman.qth.net>
Subject: [Elecraft] K3 Sub Receiver

  


Hello all

I have a K3 with the sub-receiver installed, and working. But .

The handbook says < Holding SUB links the VFOs (whether the sub
receiver is on or off). The kHz decimal point of
VFO B flashes as a reminder. VFO A is the master,
moving both VFOs in tandem. >

I cannot get this to work. I can get the sub rx to be on or off (by tapping
SUB), and I can get Diversity to work as well (with a long hold of SUB).

What other settings can there be on the radio that make it impossible to
select moving both VFO's in tandem ? - which is exactly what I want.

Thanks, and seasons greetings !

John G4ZTR




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Re: [Elecraft] K3 Sub Receiver

[Ken K6MR]

It’s a common problem with documentation for just about everything these days.  
Luckily with pdf files it’s pretty easy to add notes or edit things yourself.

And of course when all else fails there is always the group.  Something about 
the group being smarter than any individual!

Ken K6MR

From: John Lemay<mailto:j...@carltonhouse.eclipse.co.uk>
Sent: Saturday, December 26, 2020 09:48
To: 'Ken K6MR'<mailto:k...@outlook.com>; 'Elecraft Reflector 
Reflector'<mailto:elecraft@mailman.qth.net>
Subject: RE: [Elecraft] K3 Sub Receiver

Ken

Thanks for replying quickly.

I am reading the current (D10 version) manual, but on looking at your reply I 
decided to check out the errata – and there it is :-

< Pg. 14 (VFO Tuning Controls): Holding SUB now turns diversity receive on/off. 
To link VFOs, use CONFIG:VFO LNK >

And it works fine of course.

It would have saved me hours of head scratching if someone at Elecraft had 
updated the manual …

John G4ZTR


From: Ken K6MR [mailto:k...@outlook.com]
Sent: 26 December 2020 17:29
To: John Lemay; Elecraft Reflector Reflector
Subject: RE: [Elecraft] K3 Sub Receiver

You are reading an old description of the SUB button.  A firmware change made 
the long press of SUB the activation of Diversity.  Linking is done through the 
config menu.

Ken K6MR

From: John Lemay<mailto:j...@carltonhouse.eclipse.co.uk>
Sent: Saturday, December 26, 2020 09:13
To: Elecraft Reflector Reflector<mailto:elecraft@mailman.qth.net>
Subject: [Elecraft] K3 Sub Receiver

Hello all

I have a K3 with the sub-receiver installed, and working. But .

The handbook says < Holding SUB links the VFOs (whether the sub
receiver is on or off). The kHz decimal point of
VFO B flashes as a reminder. VFO A is the master,
moving both VFOs in tandem. >

I cannot get this to work. I can get the sub rx to be on or off (by tapping
SUB), and I can get Diversity to work as well (with a long hold of SUB).

What other settings can there be on the radio that make it impossible to
select moving both VFO's in tandem ? - which is exactly what I want.

Thanks, and seasons greetings !

John G4ZTR



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Re: [Elecraft] K3 Sub Receiver

[John Lemay]

Ken

 

Thanks for replying quickly.

 

I am reading the current (D10 version) manual, but on looking at your reply
I decided to check out the errata - and there it is :-

 

< Pg. 14 (VFO Tuning Controls): Holding SUB now turns diversity receive
on/off. To link VFOs, use CONFIG:VFO LNK >

 

And it works fine of course.

 

It would have saved me hours of head scratching if someone at Elecraft had
updated the manual .

 

John G4ZTR

 

 

From: Ken K6MR [mailto:k...@outlook.com] 
Sent: 26 December 2020 17:29
To: John Lemay; Elecraft Reflector Reflector
Subject: RE: [Elecraft] K3 Sub Receiver

 

You are reading an old description of the SUB button.  A firmware change
made the long press of SUB the activation of Diversity.  Linking is done
through the config menu.

 

Ken K6MR

 

From: John Lemay <mailto:j...@carltonhouse.eclipse.co.uk> 
Sent: Saturday, December 26, 2020 09:13
To: Elecraft Reflector Reflector <mailto:elecraft@mailman.qth.net> 
Subject: [Elecraft] K3 Sub Receiver

 

Hello all

I have a K3 with the sub-receiver installed, and working. But .

The handbook says < Holding SUB links the VFOs (whether the sub
receiver is on or off). The kHz decimal point of
VFO B flashes as a reminder. VFO A is the master,
moving both VFOs in tandem. >

I cannot get this to work. I can get the sub rx to be on or off (by tapping
SUB), and I can get Diversity to work as well (with a long hold of SUB).

What other settings can there be on the radio that make it impossible to
select moving both VFO's in tandem ? - which is exactly what I want.

Thanks, and seasons greetings !

John G4ZTR



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Re: [Elecraft] K3 Sub Receiver

[Ken K6MR]

You are reading an old description of the SUB button.  A firmware change made 
the long press of SUB the activation of Diversity.  Linking is done through the 
config menu.

Ken K6MR

From: John Lemay
Sent: Saturday, December 26, 2020 09:13
To: Elecraft Reflector Reflector
Subject: [Elecraft] K3 Sub Receiver

Hello all

I have a K3 with the sub-receiver installed, and working. But .

The handbook says < Holding SUB links the VFOs (whether the sub
receiver is on or off). The kHz decimal point of
VFO B flashes as a reminder. VFO A is the master,
moving both VFOs in tandem. >

I cannot get this to work. I can get the sub rx to be on or off (by tapping
SUB), and I can get Diversity to work as well (with a long hold of SUB).

What other settings can there be on the radio that make it impossible to
select moving both VFO's in tandem ? - which is exactly what I want.

Thanks, and seasons greetings !

John G4ZTR



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Re: [Elecraft] [K3] Sub receiver intermittant failures

[w4sc]

Ray

If you have KSYN3A synthesizers installed, check for the following mod.

Ref:  KSYN3A Synthesized Installation Instructionspp 5

https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740257%20KSYN3A%20Installation%20Rev%20A6.pdf

KREF3 Output Level Modification
https://ftp.elecraft.com/K3/Mod%20Notes%20Alerts/E740278%20KREF3%20Output%20Level%20Modification.pdf

Ben  W4SC

Sent from Mail for Windows 10

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Re: [Elecraft] [K3] Sub receiver intermittant failures

[Buck]

Check the obvious.  Are you sure you didn't accidentally turn down the 
RF and/or AF gain on the SubRx?  I know how easy it is to do.  I have 
seen me do it.


Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 6/10/2020 2:26 PM, hawley, charles j jr wrote:

Maybe you could remove the sub and send it for evaluation somewhat economically

Chuck Jack Hawley
KE9UW

Sent from my iPhone, cjack


On Jun 10, 2020, at 12:59 PM, Ray Albers  wrote:

I bought my K3 used. It's now a bit over six years old (S/N 8240). The
seller kindly included the manual, original invoice, a repair invoice and
even the Fred Cady book. The K3 was factory assembled, with a
factory-installed KRX3 subreceiver and the BNC auxiliary antenna connection.

If I had bought a new K3 or K3S I probably would not have bothered getting
the subreceiver, but since I have it, I figured I may as well put it to
some use. I don't chase DX but the notion of experimenting with diversity
reception interested me. So I threw a chunk of wire over the roof and
connected it to the BNC input. Admittedly not a really good diversity
antenna (much too close to the main antenna, for one thing) but OK to play
with.  When I found that the Carrier Operated Relay was operating as I sent
CW, in order to protect the sub-receiver, I stopped until I could get and
install an Array Solutions Receiver Front End Protector.

So I had many months of fun and even found that at times there was enough
diversity between the antennas to help with reception in the face of fast
QSB. And then suddenly the sub started failing.

I check it when turning the radio on, and often the sub is working but
then after a while it stops. It doesn't seem to be correlated to
transmitting, i.e., it may stop after I've been sending but not always and
never right away. There has even been a time or two when it didn't work
initially but then came back to life after a while. Often it will work on
20 and up but not on 80, 40, and 30.

I've opened the radio, taken the cover off the sub, and poked, wiggled and
re-seated everything I could get my hands on. I've even tried this poking
while the radio was powered up and the sub was quiet, to see if any poking
could bring it to life. Nada.

I suppose at this point the "right" thing to do would be to send the radio
to Elecraft and I may do that at some distant future point, but right now I
feel that I don't want the sub badly enough to warrant the expense and time.

Of course if meanwhile anyone has a miracle cure to suggest, that'd be
great!

Thanks for listening.

73
Ray K2HYD
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Re: [Elecraft] [K3] Sub receiver intermittant failures

[hawley, charles j jr]

Maybe swap synthesizers


Jack BMW Motorcycles
Chuck KE9UW
c-haw...@illinois.edu

Sent from my iPad

> On Jun 10, 2020, at 2:00 PM, Jack Brindle via Elecraft 
>  wrote:
> 
> That probably wouldn’t help. In this case the system includes the SubRx, the 
> Synthesizer and all the interconnects and cables that connect these to the 
> rest of the radio. 
> 
> I would check the interconnects, especially the tmp coax cables that go from 
> the SubRx to the rear panel connector and to the Synthesizer. Also make sure 
> the SubRx synthesizer is working properly. That might also explain the SubRx 
> issue.
> 
> 73!
> Jack, W6FB
> 
> 
>> On Jun 10, 2020, at 11:26 AM, hawley, charles j jr  
>> wrote:
>> 
>> Maybe you could remove the sub and send it for evaluation somewhat 
>> economically 
>> 
>> Chuck Jack Hawley 
>> KE9UW
>> 
>> Sent from my iPhone, cjack 
>> 
 On Jun 10, 2020, at 12:59 PM, Ray Albers  wrote:
>>> 
>>> I bought my K3 used. It's now a bit over six years old (S/N 8240). The
>>> seller kindly included the manual, original invoice, a repair invoice and
>>> even the Fred Cady book. The K3 was factory assembled, with a
>>> factory-installed KRX3 subreceiver and the BNC auxiliary antenna connection.
>>> 
>>> If I had bought a new K3 or K3S I probably would not have bothered getting
>>> the subreceiver, but since I have it, I figured I may as well put it to
>>> some use. I don't chase DX but the notion of experimenting with diversity
>>> reception interested me. So I threw a chunk of wire over the roof and
>>> connected it to the BNC input. Admittedly not a really good diversity
>>> antenna (much too close to the main antenna, for one thing) but OK to play
>>> with.  When I found that the Carrier Operated Relay was operating as I sent
>>> CW, in order to protect the sub-receiver, I stopped until I could get and
>>> install an Array Solutions Receiver Front End Protector.
>>> 
>>> So I had many months of fun and even found that at times there was enough
>>> diversity between the antennas to help with reception in the face of fast
>>> QSB. And then suddenly the sub started failing.
>>> 
>>> I check it when turning the radio on, and often the sub is working but
>>> then after a while it stops. It doesn't seem to be correlated to
>>> transmitting, i.e., it may stop after I've been sending but not always and
>>> never right away. There has even been a time or two when it didn't work
>>> initially but then came back to life after a while. Often it will work on
>>> 20 and up but not on 80, 40, and 30.
>>> 
>>> I've opened the radio, taken the cover off the sub, and poked, wiggled and
>>> re-seated everything I could get my hands on. I've even tried this poking
>>> while the radio was powered up and the sub was quiet, to see if any poking
>>> could bring it to life. Nada.
>>> 
>>> I suppose at this point the "right" thing to do would be to send the radio
>>> to Elecraft and I may do that at some distant future point, but right now I
>>> feel that I don't want the sub badly enough to warrant the expense and time.
>>> 
>>> Of course if meanwhile anyone has a miracle cure to suggest, that'd be
>>> great!
>>> 
>>> Thanks for listening.
>>> 
>>> 73
>>> Ray K2HYD
>>> __
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>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>> Message delivered to c-haw...@illinois.edu 
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Re: [Elecraft] [K3] Sub receiver intermittant failures

[Keith Trinity WE6R]

Do NOT send in just the sub! (also an intermittent will invariably NOT 
fail when here at Elecraft).
Like Jack said, check the sub KSYN3 by tapping DISP and look for PL2 
voltages or SYN2 OK (tech mode must be on). When wiggling all the 
cables, don't forget the one at the back of the sub. Look for green LED 
if you have the newer KSYN3A.
BUT if it works on some bands, and not others, it points to the KSYN3 if 
older, run the VCO cal *on the sub receiver* if you have the old KSYN3  
(shows PL2 voltages vs SYN2). (a BPF or LPF problem would be by band 
"pairs", not the whole range below 20M).

When "quiet" is it just low sensitivity? Or dead completely?
Is it dead on BOTH antenna inputs to the sub, IE Aux and Main sharing? 
Toggle back and forth repeatedly.

When dead, does toggling JUST the SUB on and off fix it?
Keith WE6R Elecraft K3 Tech.

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Re: [Elecraft] [K3] Sub receiver intermittant failures

[Jack Brindle via Elecraft]

That probably wouldn’t help. In this case the system includes the SubRx, the 
Synthesizer and all the interconnects and cables that connect these to the rest 
of the radio. 

I would check the interconnects, especially the tmp coax cables that go from 
the SubRx to the rear panel connector and to the Synthesizer. Also make sure 
the SubRx synthesizer is working properly. That might also explain the SubRx 
issue.

73!
Jack, W6FB


> On Jun 10, 2020, at 11:26 AM, hawley, charles j jr  
> wrote:
> 
> Maybe you could remove the sub and send it for evaluation somewhat 
> economically 
> 
> Chuck Jack Hawley 
> KE9UW
> 
> Sent from my iPhone, cjack 
> 
>> On Jun 10, 2020, at 12:59 PM, Ray Albers  wrote:
>> 
>> I bought my K3 used. It's now a bit over six years old (S/N 8240). The
>> seller kindly included the manual, original invoice, a repair invoice and
>> even the Fred Cady book. The K3 was factory assembled, with a
>> factory-installed KRX3 subreceiver and the BNC auxiliary antenna connection.
>> 
>> If I had bought a new K3 or K3S I probably would not have bothered getting
>> the subreceiver, but since I have it, I figured I may as well put it to
>> some use. I don't chase DX but the notion of experimenting with diversity
>> reception interested me. So I threw a chunk of wire over the roof and
>> connected it to the BNC input. Admittedly not a really good diversity
>> antenna (much too close to the main antenna, for one thing) but OK to play
>> with.  When I found that the Carrier Operated Relay was operating as I sent
>> CW, in order to protect the sub-receiver, I stopped until I could get and
>> install an Array Solutions Receiver Front End Protector.
>> 
>> So I had many months of fun and even found that at times there was enough
>> diversity between the antennas to help with reception in the face of fast
>> QSB. And then suddenly the sub started failing.
>> 
>> I check it when turning the radio on, and often the sub is working but
>> then after a while it stops. It doesn't seem to be correlated to
>> transmitting, i.e., it may stop after I've been sending but not always and
>> never right away. There has even been a time or two when it didn't work
>> initially but then came back to life after a while. Often it will work on
>> 20 and up but not on 80, 40, and 30.
>> 
>> I've opened the radio, taken the cover off the sub, and poked, wiggled and
>> re-seated everything I could get my hands on. I've even tried this poking
>> while the radio was powered up and the sub was quiet, to see if any poking
>> could bring it to life. Nada.
>> 
>> I suppose at this point the "right" thing to do would be to send the radio
>> to Elecraft and I may do that at some distant future point, but right now I
>> feel that I don't want the sub badly enough to warrant the expense and time.
>> 
>> Of course if meanwhile anyone has a miracle cure to suggest, that'd be
>> great!
>> 
>> Thanks for listening.
>> 
>> 73
>> Ray K2HYD
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Re: [Elecraft] [K3] Sub receiver intermittant failures

[hawley, charles j jr]

Maybe you could remove the sub and send it for evaluation somewhat economically 

Chuck Jack Hawley 
KE9UW

Sent from my iPhone, cjack 

> On Jun 10, 2020, at 12:59 PM, Ray Albers  wrote:
> 
> I bought my K3 used. It's now a bit over six years old (S/N 8240). The
> seller kindly included the manual, original invoice, a repair invoice and
> even the Fred Cady book. The K3 was factory assembled, with a
> factory-installed KRX3 subreceiver and the BNC auxiliary antenna connection.
> 
> If I had bought a new K3 or K3S I probably would not have bothered getting
> the subreceiver, but since I have it, I figured I may as well put it to
> some use. I don't chase DX but the notion of experimenting with diversity
> reception interested me. So I threw a chunk of wire over the roof and
> connected it to the BNC input. Admittedly not a really good diversity
> antenna (much too close to the main antenna, for one thing) but OK to play
> with.  When I found that the Carrier Operated Relay was operating as I sent
> CW, in order to protect the sub-receiver, I stopped until I could get and
> install an Array Solutions Receiver Front End Protector.
> 
> So I had many months of fun and even found that at times there was enough
> diversity between the antennas to help with reception in the face of fast
> QSB. And then suddenly the sub started failing.
> 
> I check it when turning the radio on, and often the sub is working but
> then after a while it stops. It doesn't seem to be correlated to
> transmitting, i.e., it may stop after I've been sending but not always and
> never right away. There has even been a time or two when it didn't work
> initially but then came back to life after a while. Often it will work on
> 20 and up but not on 80, 40, and 30.
> 
> I've opened the radio, taken the cover off the sub, and poked, wiggled and
> re-seated everything I could get my hands on. I've even tried this poking
> while the radio was powered up and the sub was quiet, to see if any poking
> could bring it to life. Nada.
> 
> I suppose at this point the "right" thing to do would be to send the radio
> to Elecraft and I may do that at some distant future point, but right now I
> feel that I don't want the sub badly enough to warrant the expense and time.
> 
> Of course if meanwhile anyone has a miracle cure to suggest, that'd be
> great!
> 
> Thanks for listening.
> 
> 73
> Ray K2HYD
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Re: [Elecraft] K3 Sub-receiver RIT

[K9MA]

You have to integrate SO2V operation with the logging software. If you 
just switch VFO's, you have to switch back to run mode when you go back 
to the run frequency. Any small delay improves the chances you'll miss a 
contact or lose the frequency, so it has to be very fast. With the 
software I use, ctl-right arrow switches both tx and rx to VFO B, and 
moves to the VFO B logging window. Ctl-left arrow switches back to VFO 
A. There's no issue with using RIT when running on A and searching with 
B, but then the P3 can't be used to find new signals more than 10 kHz 
from the run frequency. Running on B solves that problem, but then 
there's no RIT when running.


Actually, while RIT on the search and pounce VFO is most important, XIT 
is more useful when running. The ideal SO2V radio would allow RIT on B 
and XIT on A, automatically switching with the logging software.


73,
Scott K9MA



On 1/15/2019 16:04, Don Wilhelm wrote:

Gernot,

If you have the subRX, why not tune to listen for those off-frequency 
stations with the VFO B knob.  Your transmit frequency is unchanged on 
VFO A, so no need for RIT unless you are only listening to the mainRX.


An easy VFO A>B pushbutton will put VFO on the same frequency as VFO A 
anytime you change your transmit frequency.


73,
Don W3FPR

On 1/15/2019 4:29 PM, g...@gmx.net wrote:

John,
the issue with SO2V is that you want to stay on your run frequency, 
but be able to slightly tune up and down to hear callers which are 
not exactly on your TX freq. RIT comes in handy here, as you just 
press RIT or CLR after the QSO is finished. I don't have a K-POD, but 
if it would let me do this stuff I'd consider buying one.

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Re: [Elecraft] K3 Sub-receiver RIT

[Don Wilhelm]

Gernot,

If you have the subRX, why not tune to listen for those off-frequency 
stations with the VFO B knob.  Your transmit frequency is unchanged on 
VFO A, so no need for RIT unless you are only listening to the mainRX.


An easy VFO A>B pushbutton will put VFO on the same frequency as VFO A 
anytime you change your transmit frequency.


73,
Don W3FPR

On 1/15/2019 4:29 PM, g...@gmx.net wrote:

John,
the issue with SO2V is that you want to stay on your run frequency, but 
be able to slightly tune up and down to hear callers which are not 
exactly on your TX freq. RIT comes in handy here, as you just press RIT 
or CLR after the QSO is finished. I don't have a K-POD, but if it would 
let me do this stuff I'd consider buying one.

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Re: [Elecraft] K3 Sub-receiver RIT

[gt-i]

John,
the issue with SO2V is that you want to stay on your run frequency, but 
be able to slightly tune up and down to hear callers which are not 
exactly on your TX freq. RIT comes in handy here, as you just press RIT 
or CLR after the QSO is finished. I don't have a K-POD, but if it would 
let me do this stuff I'd consider buying one.

73
Gernot
DF5RF

Am 15.01.2019 um 02:55 schrieb j...@kk9a.com:

If you have a K-Pod it is just as easy to tune with VFO B while running on
A. Is the issue the way the P3 is used to move in on a signal? I have K-Pod
buttons to turn RIT on and off and also to clear the offset.

John KK9A


K9MA wrote:

I've found that during some contest operation, it's handy to call CQ on
VFO B, while using VFO A to search and pounce. (Known as Single Operator
2 VFO mode, SO2V.) That way, when unassisted, I can use the P3 to locate
promising signals. However, I sometimes wish the RIT would work with the
sub-receiver on VFO B. Has anyone found a way to do this? Even better
would be to have RIT on VFO B and XIT on VFO A.

If it's not currently possible, I'd add it to my firmware wish list.

73,

Scott K9MA

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Re: [Elecraft] K3 Sub-receiver RIT

[K9MA]

"Of course if you get too far away from your run frequency, you'll have 
to increase the P3 span so that you can still the VFO B cursor"


Therein lies the problem: With the span set to more than 10 kHz, it's 
very hard to resolve CW signals on the P3. A VGA display would help, of 
course, but I'd rather not go that way.


Anyhow, I'm hoping maybe just a little mod to the K3(s) firmware could 
provide a way to use RIT with VFO B.


73,
Scott K9MA

On 1/14/2019 23:58, Bob Wilson, N6TV wrote:
On Sun, Jan 13, 2019 at 9:15 AM K9MA > wrote:


I've found that during some contest operation, it's handy to call
CQ on
VFO B, while using VFO A to search and pounce. (Known as Single
Operator
2 VFO mode, SO2V.) That way, when unassisted, I can use the P3 to
locate
promising signals. However, I sometimes wish the RIT would work
with the
sub-receiver on VFO B. Has anyone found a way to do this? Even better
would be to have RIT on VFO B and XIT on VFO A.


When running SO2V unassisted, I find it easiest to do the opposite:  
CQ on VFO A, and S on VFO B.  Then you can have the RIT on A and 
watch the VFO B cursor track VFO B. Of course if you get too far away 
from your run frequency, you'll have to increase the P3 span so that 
you can still the VFO B cursor, but this is the best way around this 
problem for now, without resorting to extra hardware.


Of course assisted operators can just send a spot to VFO B to have a 
listen.


73,
Bob, N6TV



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Re: [Elecraft] K3 Sub-receiver RIT

[Bob Wilson, N6TV]

On Sun, Jan 13, 2019 at 9:15 AM K9MA  wrote:

> I've found that during some contest operation, it's handy to call CQ on
> VFO B, while using VFO A to search and pounce. (Known as Single Operator
> 2 VFO mode, SO2V.) That way, when unassisted, I can use the P3 to locate
> promising signals. However, I sometimes wish the RIT would work with the
> sub-receiver on VFO B. Has anyone found a way to do this? Even better
> would be to have RIT on VFO B and XIT on VFO A.
>

When running SO2V unassisted, I find it easiest to do the opposite:  CQ on
VFO A, and S on VFO B.  Then you can have the RIT on A and watch the VFO
B cursor track VFO B.  Of course if you get too far away from your run
frequency, you'll have to increase the P3 span so that you can still the
VFO B cursor, but this is the best way around this problem for now, without
resorting to extra hardware.

Of course assisted operators can just send a spot to VFO B to have a listen.

73,
Bob, N6TV
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Re: [Elecraft] K3 Sub-receiver RIT

[K9MA]

On 1/14/2019 19:55, j...@kk9a.com wrote:

  Is the issue the way the P3 is used to move in on a signal?


Yes, that is exactly the issue. When unassisted, using the P3 is the 
best method I've found for finding new contacts. However, the span has 
to be 10 kHz, or it's too hard to resolve cw signals. (I know, I could 
add a VGA display.) Other than the RIT issue, running on VFO B and the 
sub rx works well.


If there were a setting, say, to make the RIT apply to VFO B only when 
the sub was on, the problem would be solved.


73,

Scott K9MA

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Re: [Elecraft] K3 Sub-receiver RIT

[K9MA]

Thanks, Gernot. I came to the same conclusion. I also tried using 
"BSET", but it doesn't enable the RIT on VFO B. Maybe a firmware update 
could fix that?


73,
Scott K9MA


On 1/14/2019 19:01, g...@gmx.net wrote:

Scott,
I looked at the programmer ref manual and realized there is only one 
RIT/XIT, which is controlling VFO A. I guess there are two choices left:

- either you press A/B to switch to your CQ VFO.
- or you try to mimick RIT of VFO B via FBxxx; commands with the help 
of an external control knob.

Maybe this feature can be added more easily to the K-POD?
73
Gernot
DF5RF


Am 13.01.2019 um 18:14 schrieb K9MA:
I've found that during some contest operation, it's handy to call CQ 
on VFO B, while using VFO A to search and pounce. (Known as Single 
Operator 2 VFO mode, SO2V.) That way, when unassisted, I can use the 
P3 to locate promising signals. However, I sometimes wish the RIT 
would work with the sub-receiver on VFO B. Has anyone found a way to 
do this? Even better would be to have RIT on VFO B and XIT on VFO A.


If it's not currently possible, I'd add it to my firmware wish list.

73,

Scott K9MA


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Re: [Elecraft] K3 Sub-receiver RIT

[gt-i]

Scott,
I looked at the programmer ref manual and realized there is only one 
RIT/XIT, which is controlling VFO A. I guess there are two choices left:

- either you press A/B to switch to your CQ VFO.
- or you try to mimick RIT of VFO B via FBxxx; commands with the help of 
an external control knob.

Maybe this feature can be added more easily to the K-POD?
73
Gernot
DF5RF


Am 13.01.2019 um 18:14 schrieb K9MA:
I've found that during some contest operation, it's handy to call CQ 
on VFO B, while using VFO A to search and pounce. (Known as Single 
Operator 2 VFO mode, SO2V.) That way, when unassisted, I can use the 
P3 to locate promising signals. However, I sometimes wish the RIT 
would work with the sub-receiver on VFO B. Has anyone found a way to 
do this? Even better would be to have RIT on VFO B and XIT on VFO A.


If it's not currently possible, I'd add it to my firmware wish list.

73,

Scott K9MA


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Re: [Elecraft] K3 Sub-Receiver, filters, I/O Board For Sale

[Bill Leonard N0CU]

Jeff,

Is your sub-receiver still available?

Bill N0CU



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Re: [Elecraft] K3 Sub receiver

[Joe Subich, W4TV]

It has a dual RTTY mode with two decode windows, one for the main
receiver and one for the sub, like using stereo headphones for CW of
SSB. It is the only program I know of, for any platform, that does
this.


MixW has a dual channel decode mode.  N1MM Logger+, and WiteLog will
both open two RTTY decode windows (using two copies of MMTTY), DXLab
Suite will open three RTTY decode Windows (using MMTTY, 2Tone and the
K3 Decoder or a hardware TU) which can be assigned to either receiver,
and Logger32 can open two decode windows (one for each receiver).

Dual channel decode is quite common in the Windows world.

73,

   ... Joe, W4TV


On 2/9/2017 6:30 PM, Bill Frantz wrote:

Being able to easily run both main and sub in RTTY is why I still use
cocoaModem on my Macintosh. (It suffered from serious incompatibility
with a new version of the OS a few versions ago. I still have a
backlevel machine with full functionality.)

It has a dual RTTY mode with two decode windows, one for the main
receiver and one for the sub, like using stereo headphones for CW of
SSB. It is the only program I know of, for any platform, that does this.

73 Bill AE6JV

On 2/9/17 at 10:48 AM, n...@widomaker.com (Nr4c) wrote:


Wrong question. It's already there. The USB audio is stereo. The main
RX is on the left channel and the sub is on the right.
Question is what do you want to do with the sub RX audio?

I.e., for RTTY you'd need to run a separate instance if MMTTY and set
input from RTTY channel.


Bill Frantz|"Insofar as the propositions of mathematics refer to
408-356-8506   | reality, they are not certain; and insofar they are
www.pwpconsult.com | certain, they do not refer to reality.” -- Einstein

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Re: [Elecraft] K3 Sub receiver

[Bill Frantz]

Being able to easily run both main and sub in RTTY is why I 
still use cocoaModem on my Macintosh. (It suffered from serious 
incompatibility with a new version of the OS a few versions ago. 
I still have a backlevel machine with full functionality.)


It has a dual RTTY mode with two decode windows, one for the 
main receiver and one for the sub, like using stereo headphones 
for CW of SSB. It is the only program I know of, for any 
platform, that does this.


73 Bill AE6JV

On 2/9/17 at 10:48 AM, n...@widomaker.com (Nr4c) wrote:

Wrong question. It's already there. The USB audio is stereo. 
The main RX is on the left channel and the sub is on the right.

Question is what do you want to do with the sub RX audio?

I.e., for RTTY you'd need to run a separate instance if MMTTY and set input 
from RTTY channel.


Bill Frantz|"Insofar as the propositions of mathematics 
refer to
408-356-8506   | reality, they are not certain; and insofar 
they are
www.pwpconsult.com | certain, they do not refer to reality.” 
-- Einstein


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Re: [Elecraft] K3 Sub receiver

[John Lemay]

Bill, Joe and Fred

Thanks for your quick replies. It certainly WAS the correct question to ask.

Fred has put his finger on the problem; my Windows settings had defaulted to
single channel audio. My question turns into "how do I get Spectran to look
at the other channel" but that's not an Elecraft question.

Why am I interested in the audio from the second receiver ? This goes back
to a problem with my K3 which on 28MHz has a large number of receiver
birdies - I posted about this a couple of weeks ago. The situation has been
improved by tightening all the panel screws absolutely as hard as I can. I'm
no weakling but it seems that I was being a bit too cautious. But some
birdies remain, and I noticed that they are at different levels and
different frequencies on the sub. So I was making a careful check and
listing the frequencies and signal level, using Spectran. But so far, only
on the main rx. Hence my question.

John G4ZTR

-Original Message-
From: Nr4c [mailto:n...@widomaker.com] 
Sent: Thursday, February 9, 2017 18:48
To: John Lemay
Cc: Elecraft Reflector Reflector
Subject: Re: [Elecraft] K3 Sub receiver

Wrong question. It's already there. The USB audio is stereo. The main RX is
on the left channel and the sub is on the right. 

Question is what do you want to do with the sub RX audio?

I.e., for RTTY you'd need to run a separate instance if MMTTY and set input
from RTTY channel. 

Sent from my iPhone
...nr4c. bill


> On Feb 9, 2017, at 8:55 AM, John Lemay <j...@carltonhouse.eclipse.co.uk>
wrote:
> 
> Hello all
> 
> I hope this is not a dumb question .. I have a K3 (not S) 
> which has the sub receiver and has been updated with the KIO3B.
> 
> I have main RX audio available on the USB port.
> 
> Can I have the sub RX audio on the USB port - and if so, how is it done ?
> 
> Many thanks
> 
> John G4ZTR
> 
> 
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Re: [Elecraft] K3 Sub receiver

[Cady, Fred]

Maybe not so wrong.  The sub audio is on the right channel of the USB audio but 
you may have to go into the Windows Sound set up and the USB audio Codec to be 
a 2, channel, 48000 Hz device.  Windows sometimes sets this to be a single 
channel device.


Cheers and 73,

Fred KE7X


For all KE7X books, see www.ke7x.com<http://www.ke7x.com>




From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Nr4c 
<n...@widomaker.com>
Sent: Thursday, February 9, 2017 11:48 AM
To: John Lemay
Cc: Elecraft Reflector Reflector
Subject: Re: [Elecraft] K3 Sub receiver

Wrong question. It's already there. The USB audio is stereo. The main RX is on 
the left channel and the sub is on the right.

Question is what do you want to do with the sub RX audio?

I.e., for RTTY you'd need to run a separate instance if MMTTY and set input 
from RTTY channel.

Sent from my iPhone
...nr4c. bill


> On Feb 9, 2017, at 8:55 AM, John Lemay <j...@carltonhouse.eclipse.co.uk> 
> wrote:
>
> Hello all
>
> I hope this is not a dumb question .. I have a K3 (not S) which has
> the sub receiver and has been updated with the KIO3B.
>
> I have main RX audio available on the USB port.
>
> Can I have the sub RX audio on the USB port - and if so, how is it done ?
>
> Many thanks
>
> John G4ZTR
>
>
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Re: [Elecraft] K3 Sub receiver

[Nr4c]

Wrong question. It's already there. The USB audio is stereo. The main RX is on 
the left channel and the sub is on the right. 

Question is what do you want to do with the sub RX audio?

I.e., for RTTY you'd need to run a separate instance if MMTTY and set input 
from RTTY channel. 

Sent from my iPhone
...nr4c. bill


> On Feb 9, 2017, at 8:55 AM, John Lemay  
> wrote:
> 
> Hello all
> 
> I hope this is not a dumb question .. I have a K3 (not S) which has
> the sub receiver and has been updated with the KIO3B.
> 
> I have main RX audio available on the USB port.
> 
> Can I have the sub RX audio on the USB port - and if so, how is it done ?
> 
> Many thanks
> 
> John G4ZTR
> 
> 
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Re: [Elecraft] K3 Sub receiver

[Joe Subich, W4TV]

Sub receiver audio is available on the *RIGHT CHANNEL* of USB Audio
CODEC - just as it is available on the *RING* of the LINE OUT jack
and RING of the headphones jack.

73,

   ... Joe, W4TV


On 2/9/2017 8:55 AM, John Lemay wrote:

Hello all

I hope this is not a dumb question .. I have a K3 (not S) which has
the sub receiver and has been updated with the KIO3B.

I have main RX audio available on the USB port.

Can I have the sub RX audio on the USB port - and if so, how is it done ?

Many thanks

John G4ZTR


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Re: [Elecraft] K3 Sub Receiver problem with KSYN3A

[Jeff]

I worked it with Howard from Elecraft and everything points to the board but 
also wanted to run it through here to see if anyone else had a problem like 
that. My K3 is an older one with the older Synthesizer boards so I can’t do any 
“swaptronix” with the boards. 

 

From: guyk...@gmail.com [mailto:guyk...@gmail.com] On Behalf Of Guy Olinger K2AV
Sent: Saturday, January 16, 2016 3:58 PM
To: Jeff <k8...@charter.net>
Cc: Elecraft Reflector <elecraft@mailman.qth.net>
Subject: Re: [Elecraft] K3 Sub Receiver problem with KSYN3A

 

I hope that you worked that problem through with Elecraft Tech Support on the 
phone, particularly since there's the cost of a KSYN3A involved. Some troubles 
have so much stuff floating around to sort through that it's just plain 
difficult to work it via email. 

 

73, Guy K2AV

 

On Sat, Jan 16, 2016 at 12:50 PM, Jeff <k8...@charter.net 
<mailto:k8...@charter.net> > wrote:

Hello,



My Dad picked up a K3 that is a late number 9xxx it had a sub receiver and
both synthesizers are the KSYN3A. A little history on the rig first,
Original owner bought as 100 watt kit and installed the sub receiver. Second
owner installed a couple filters on the main board and the antenna tuner
KAT3 and my Dad got from him. Anyway, my Dad and I were going through it and
could not get anything out of the sub receiver, set speakers to 1 and now we
get static so that's a good sign.



Figured it was the settings so checked KRX3 and set it to Ant-BNC and hooked
up to the AUX BNC to the signal generator. Went through setup with K3
Support from Elecraft and still nothing. Checked all connections on sub
receiver and noticed that the Green LED on the sub KSYN3A was not lit like
on the main receiver KSYN3A. Swapped them and appears that the problem is on
the board because now I have a green light on the sub (originally main) and
nothing on the main (originally sub). Went to check syn status and it showed
PLL instead of SYN1 OK and SYN2 OK. No receive on main or sub.



I put them back the original way and main works but no sub Status says SYN1
OK and SYN 2 OK but no green LED light on the sub board. I ordered a new
KSYN3A for the sub so hope that works but still have no idea why no green
LED but says SYN2 OK.



Any thoughts on my long winded comment?



73,

Jeff

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Re: [Elecraft] K3 Sub Receiver problem with KSYN3A

[Jeff]

Thanks for the reply, I hope that it's the board, that way I can send in the 
"broke" one and see if they can fix it cheaper than a new one. That way I would 
be halfway to getting my K3 updated hi hi.

Anyway I got My dad's set up for him and he is tickled to have a good rig for 
CW. He'll just use RIT for DX and he is good with that for now.

73,
Jeff

-Original Message-
From: Merv Schweigert [mailto:k...@flex.com] 
Sent: Saturday, January 16, 2016 5:06 PM
To: Jeff <k8...@charter.net>
Subject: Re: [Elecraft] K3 Sub Receiver problem with KSYN3A

Jeff,  not sure if anyone answered your real question,  but yes have seen 
several posts about the new Synth board stop working, and a couple not working 
from the factory,  same problem as you have,  no green light etc.
Seems to be some are having the problems,  not many but a few.

73 Merv K9FD/KH6

> I worked it with Howard from Elecraft and everything points to the board but 
> also wanted to run it through here to see if anyone else had a problem like 
> that. My K3 is an older one with the older Synthesizer boards so I can’t do 
> any “swaptronix” with the boards.
>
>   
>
> From: guyk...@gmail.com [mailto:guyk...@gmail.com] On Behalf Of Guy 
> Olinger K2AV
> Sent: Saturday, January 16, 2016 3:58 PM
> To: Jeff <k8...@charter.net>
> Cc: Elecraft Reflector <elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] K3 Sub Receiver problem with KSYN3A
>
>   
>
> I hope that you worked that problem through with Elecraft Tech Support on the 
> phone, particularly since there's the cost of a KSYN3A involved. Some 
> troubles have so much stuff floating around to sort through that it's just 
> plain difficult to work it via email.
>
>   
>
> 73, Guy K2AV
>
>   
>
>



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Re: [Elecraft] K3 Sub Receiver problem with KSYN3A

[Guy Olinger K2AV]

I hope that you worked that problem through with Elecraft Tech Support on
the phone, particularly since there's the cost of a KSYN3A involved. Some
troubles have so much stuff floating around to sort through that it's just
plain difficult to work it via email.

73, Guy K2AV

On Sat, Jan 16, 2016 at 12:50 PM, Jeff  wrote:

> Hello,
>
>
>
> My Dad picked up a K3 that is a late number 9xxx it had a sub receiver and
> both synthesizers are the KSYN3A. A little history on the rig first,
> Original owner bought as 100 watt kit and installed the sub receiver.
> Second
> owner installed a couple filters on the main board and the antenna tuner
> KAT3 and my Dad got from him. Anyway, my Dad and I were going through it
> and
> could not get anything out of the sub receiver, set speakers to 1 and now
> we
> get static so that's a good sign.
>
>
>
> Figured it was the settings so checked KRX3 and set it to Ant-BNC and
> hooked
> up to the AUX BNC to the signal generator. Went through setup with K3
> Support from Elecraft and still nothing. Checked all connections on sub
> receiver and noticed that the Green LED on the sub KSYN3A was not lit like
> on the main receiver KSYN3A. Swapped them and appears that the problem is
> on
> the board because now I have a green light on the sub (originally main) and
> nothing on the main (originally sub). Went to check syn status and it
> showed
> PLL instead of SYN1 OK and SYN2 OK. No receive on main or sub.
>
>
>
> I put them back the original way and main works but no sub Status says SYN1
> OK and SYN 2 OK but no green LED light on the sub board. I ordered a new
> KSYN3A for the sub so hope that works but still have no idea why no green
> LED but says SYN2 OK.
>
>
>
> Any thoughts on my long winded comment?
>
>
>
> 73,
>
> Jeff
>
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Re: [Elecraft] K3 Sub Receiver Question

[Mike K2MK]

Hi Mike,

Did you possibly click on a spot from your logging programing? 

Have you conducted any tests without any PC programs talking to the K3?

Do you use the M1 through M4 buttons as quick band segment jump keys? Did
you use the K3 Frequency memory editor program? Did you set up the sub RX as
well as the main RX in the program?

73,
Mike K2MK


Mike VE3YF wrote
 Hi:
 
 For some reason every time I engage the Sub Receiver it defaults to 
 CW. For example I have set it up on 80m to be in LSB via BSET and 
 saved it, and yet it will stay
 in LSB for awhile, and at some point in time it just changes mode to 
 CW still on the same freq etc. The setting will be held even if I 
 turn the rig off and on, just after a
 period of time it just reverts back to CW. On my other K3, I don't 
 have this problem. the other K3 holds the setting just fine. I 
 thought perhaps the memory battery is
 going bad, but it is ok and all customized settings are holding.
 
 Has anyone ever experienced this problem
 
 73 De Mike
 VE3YF





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Re: [Elecraft] K3: Sub receiver goes silent at narrow bandwidth

[Chuck Teague via Elecraft]

Hi Wayne, 
No new synth.  I first noticed the problem when using diversity, but it
persists when the receivers are separated.  I'm thinking it is probably a
construction or installation problem and wanted to know if there are known
errors that would cause this.

NN7U



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Re: [Elecraft] K3: Sub receiver goes silent at narrow bandwidth

[Wayne Burdick]

This could be a bug. Are you using new synths? Diversity mode?

Wayne
N6KR



On Mar 12, 2015, at 9:25 AM, Chuck Teague via Elecraft 
elecraft@mailman.qth.net wrote:

 My first post on this didn't make it to the list due to clerical error on my 
 part, so here is attempt two.
 The sub-receiver in my K3 is equipped with a 2.7 5 pole filter in position 1, 
 and a 400Hz 8 pole in position 5.  All works well until I narrow the 
 bandwidth to 400 Hz, then the sub-receiver goes quiet (the main continues to 
 work normally.)  I used the K3 utility to set filter 5 bandwidth both 
 narrower and wider, and wherever it is configured is where the receiver goes 
 quiet.
 I can't find anything in the archives about this particular problem, but 
 thought I would seek the group collective wisdom before tearing into the 
 radio. Thanks,
 Chuck Teague, NN7U
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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Don Wilhelm]

Doug,

Not necessarily - the K3 RX antenna input can be exposed to RF from the 
TX antenna whether that is the K3 transmitting or another transmitter.
In the case of another transmitter, one can add the exposure to the K3 
normal ANT1 or ANT2 input if an antenna is connected.


73,
Don W3FPR

On 1/28/2015 7:45 AM, Doug Turnbull wrote:

Lyle and company,
  To be clear are you talking about using another transmitter other than
the K3's transmitter and external amplifier?   This is my reading and I am
just checking.   Thank you.




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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Doug Turnbull]

Lyle and company,
 To be clear are you talking about using another transmitter other than
the K3's transmitter and external amplifier?   This is my reading and I am
just checking.   Thank you.

   73 Doug EI2CN

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle
Johnson
Sent: 27 January 2015 23:45
To: Elecraft Reflector
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

In general, ensure the coupled energy into the receiver antenna 
connector is less than 1 watt under absolute worst case conditions, and 
preferably under 100 mW, and your receiver should be OK.

Put another way, the antennas should be separated by 40 dB if running up 
to 1 kW, 30 dB if running up to 100W and 20 dB if running up to 10W.  
You might get away with 10 dB less coupling. If you can't get this level 
of isolation by physical separation and/or orientation of the antennas, 
provide some external means of reducing the signal to the receiver input.

Yes, the K3 inputs are tested to higher levels than this, but why stress 
the radio and risk damage to or degradation of the receiver(s)?

If you hear the receiver COR relay click when using the other 
transmitter, reduce the coupling between the antennas or otherwise 
prevent the excess energy from reaching the receiver input.

73,

Lyle KK7P

 ...can you please elaborate on what is sufficient antenna separation when
a transmitter is operating on another antenna?

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[David Cutter]

If the 2nd rx pre-amp can add sufficient gain, then a resistive divider on 
that input will add a good degree of protection.  Receive-only aerials often 
have their own pre-amps, so there might be plenty of gain in hand.  Coax to 
the 2nd rx should still be protected against common mode current.


David
G3UNA




On Jan 28, 2015, at 7:45 AM, Doug Turnbull turnb...@net1.ie wrote:

Lyle and company,
To be clear are you talking about using another transmitter other 
than
the K3's transmitter and external amplifier?   This is my reading and I 
am

just checking.   Thank you.



Both.   I believe the OP asked about the sub RX and the K3 transmitter   I 
broadened the question because I blew out the front end on the K3 while 
testing another transmitter.   Either situation speaks to how much the K3 
receiver can take from external RF.  But some solutions such as putting 
protective devices in front of the K3 sub receiver will not work of course 
when the situation involves the K3 main receiver and an external 
transmitter.


Ken WA8JXM


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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Edward R Cole]

Semi-related topic:

Recently, I was hosting a local 2m-SSB net and had my KX3-2M 
connected to a 7-element yagi pointed 90-degrees from the 
transmitting antenna array (K3+xvtr+150w amp).  Spacing is about 
40-feet horizontally and 30-feet vertically (Tx ant higher).  Its 
normal to run the Preamp with the KX3 on 2m and when I transmitted 
the signal was strong enough to trigger overload protection in the 
KX3 which disables the preamp.  Probably 25-dB front-back ratio on 
the transmitting antenna and maybe 15-dB rejection off the side of 
the Rx antenna (both yagis) so estimated power at the KX3 is +52-dBm 
- 40dB = +12 dBm (not including space loss between antennas).  +12 
dBm into the KX3-2M is pretty marginal for safety of the 
preamp.  Probably actual level is closer to 0 dBm (because I didn't 
include coax loss or space loss).  -33 dBm signal from my XG3 will 
drive the KX3 to S9+40 (-73 dBm=S9*).  *with preamp=ON.


Since antennas are within near-fields, ordinary space loss formula do 
not apply.  That is the typical situation with the KRX3 used on HF.


1-watt is way too high for safety for my eme preamps.  +5 dBm is my 
maximum tolerance.  +15 dBm is certainty of blow out.  (I disconnect 
other antennas when running 1300w on the main array)


73, Ed - KL7UW
http://www.kl7uw.com
Kits made by KL7UW
Dubus Mag business:
dubus...@gmail.com

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Ken]

 On Jan 28, 2015, at 7:45 AM, Doug Turnbull turnb...@net1.ie wrote:
 
 Lyle and company,
 To be clear are you talking about using another transmitter other than
 the K3's transmitter and external amplifier?   This is my reading and I am
 just checking.   Thank you.


Both.   I believe the OP asked about the sub RX and the K3 transmitter   I 
broadened the question because I blew out the front end on the K3 while testing 
another transmitter.   Either situation speaks to how much the K3 receiver can 
take from external RF.  But some solutions such as putting protective devices 
in front of the K3 sub receiver will not work of course when the situation 
involves the K3 main receiver and an external transmitter.

Ken WA8JXM

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Doug Turnbull]

Don,
Thank you.   There is no problem so far but I will place an order with
Array Solutions for a bit of additional protection.   The forum is useful!
Thanks to all for bringing this issue up.

  73 Doug EI2CN

-Original Message-
From: Don Wilhelm [mailto:w3...@embarqmail.com] 
Sent: 28 January 2015 13:41
To: Doug Turnbull; 'Lyle Johnson'; 'Elecraft Reflector'
Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

Doug,

Not necessarily - the K3 RX antenna input can be exposed to RF from the 
TX antenna whether that is the K3 transmitting or another transmitter.
In the case of another transmitter, one can add the exposure to the K3 
normal ANT1 or ANT2 input if an antenna is connected.

73,
Don W3FPR

On 1/28/2015 7:45 AM, Doug Turnbull wrote:
 Lyle and company,
   To be clear are you talking about using another transmitter other
than
 the K3's transmitter and external amplifier?   This is my reading and I am
 just checking.   Thank you.




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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Frank Krozel]

Folks, 

Have we lost track of our senses?  (I never vent so please allow me to do so..)

I like to “trade a lot and see many radios that have a blown out front end, 
which usually I can fix.

Most times the victim radio was “on receive” with a shiny new transmitter that 
was “just being set in place” into the operator position.
Usually the old radio is on an antenna that was in very close proximity to the 
new one.

Professionally I do EMC work and while I can bore you with the math… ether you 
connect “something” in line with the old receiver (there are lots of 
manufacturers out there) … or you leave the old radio disconnected when 
transmitting.Not too many radios are designed for 100 watts into an 
adjacent antenna, let alone 500W or 1kW….

This is NOT an Elecraft issue….

Sorry to vent, I love my K2’s

Frank KG9H






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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Harry Yingst via Elecraft]

Now this has me wondering about having my 2 meter and 6 meter antennas in close 
proximity.

 



  From: Edward R Cole kl...@acsalaska.net
 To: Elecraft@mailman.qth.net 
 Sent: Wednesday, January 28, 2015 4:44 PM
 Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
   
Semi-related topic:

Recently, I was hosting a local 2m-SSB net and had my KX3-2M 
connected to a 7-element yagi pointed 90-degrees from the 
transmitting antenna array (K3+xvtr+150w amp).  Spacing is about 
40-feet horizontally and 30-feet vertically (Tx ant higher).  Its 
normal to run the Preamp with the KX3 on 2m and when I transmitted 
the signal was strong enough to trigger overload protection in the 
KX3 which disables the preamp.  Probably 25-dB front-back ratio on 
the transmitting antenna and maybe 15-dB rejection off the side of 
the Rx antenna (both yagis) so estimated power at the KX3 is +52-dBm 
- 40dB = +12 dBm (not including space loss between antennas).  +12 
dBm into the KX3-2M is pretty marginal for safety of the 
preamp.  Probably actual level is closer to 0 dBm (because I didn't 
include coax loss or space loss).  -33 dBm signal from my XG3 will 
drive the KX3 to S9+40 (-73 dBm=S9*).  *with preamp=ON.

Since antennas are within near-fields, ordinary space loss formula do 
not apply.  That is the typical situation with the KRX3 used on HF.

1-watt is way too high for safety for my eme preamps.  +5 dBm is my 
maximum tolerance.  +15 dBm is certainty of blow out.  (I disconnect 
other antennas when running 1300w on the main array)

73, Ed - KL7UW
http://www.kl7uw.com
    Kits made by KL7UW
Dubus Mag business:
    dubus...@gmail.com

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Wayne Burdick]

This would only be necessary if you're running high power and/or the antenna to 
be used with the KRX3 is close to the transmit antenna. Could you describe your 
antenna system?

Wayne
N6KR


http://www.elecraft.com

 On Jan 27, 2015, at 7:12 AM, Harry Yingst via Elecraft 
 elecraft@mailman.qth.net wrote:
 
 I ordered the sub receiver and in the conversation with Elecraft I was 
 informed that it is good idea to build a device that would short the 
 dedicated RX antenna to ground to protect it during transmit.
 The simple way would be a relay but I'd rather not hear a relay click with 
 each transmission.
 I was wondering what others are using to accomplish this.
 
 Thank you
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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Phil Anderson]

Perhaps you could clarify protection on RX inputs. I have the KRX3 and 
run the internal 100 watt amp.
Sometimes I share the same antenna with TX,  ANT 1 or ANT2. I assumed 
there that the RX is protected.
Sometimes I use the AUX antenna for diversity receive. Is that input not 
protected? When does it need to be?


Is there a general rule?

TNX and love the rig: K3, P3, KXR3 and 100 watt internal amp.

Phil, W0XI, KS


Wayne Burdick mailto:n...@elecraft.com
Tuesday, January 27, 2015 1:07 PM
This would only be necessary if you're running high power and/or the 
antenna to be used with the KRX3 is close to the transmit antenna. 
Could you describe your antenna system?


Wayne
N6KR


http://www.elecraft.com

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Harry Yingst via Elecraft mailto:elecraft@mailman.qth.net
Tuesday, January 27, 2015 9:12 AM
I ordered the sub receiver and in the conversation with Elecraft I was 
informed that it is good idea to build a device that would short the 
dedicated RX antenna to ground to protect it during transmit.
The simple way would be a relay but I'd rather not hear a relay click 
with each transmission.

I was wondering what others are using to accomplish this.

Thank you
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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Lyle Johnson]

In general, ensure the coupled energy into the receiver antenna 
connector is less than 1 watt under absolute worst case conditions, 
and preferably under 100 mW, and your receiver should be OK.


Put another way, the antennas should be separated by 40 dB if running 
up to 1 kW, 30 dB if running up to 100W and 20 dB if running up to 
10W.  You might get away with 10 dB less coupling.


Of course, I meant 10 dB *more* coupling, or 10 dB *less* isolation.

If you can't get this level of isolation by physical separation and/or 
orientation of the antennas, provide some external means of reducing 
the signal to the receiver input.


Yes, the K3 inputs are tested to higher levels than this, but why 
stress the radio and risk damage to or degradation of the receiver(s)?


If you hear the receiver COR relay click when using the other 
transmitter, reduce the coupling between the antennas or otherwise 
prevent the excess energy from reaching the receiver input.


73,

Lyle KK7P

...can you please elaborate on what is sufficient antenna separation 
when a transmitter is operating on another antenna?





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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Harry Yingst via Elecraft]

Thank you


  From: Lyle Johnson kk7p4...@gmail.com
 To: Elecraft Reflector elecraft@mailman.qth.net 
 Sent: Tuesday, January 27, 2015 6:45 PM
 Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
   
In general, ensure the coupled energy into the receiver antenna 
connector is less than 1 watt under absolute worst case conditions, and 
preferably under 100 mW, and your receiver should be OK.

Put another way, the antennas should be separated by 40 dB if running up 
to 1 kW, 30 dB if running up to 100W and 20 dB if running up to 10W.  
You might get away with 10 dB less coupling. If you can't get this level 
of isolation by physical separation and/or orientation of the antennas, 
provide some external means of reducing the signal to the receiver input.

Yes, the K3 inputs are tested to higher levels than this, but why stress 
the radio and risk damage to or degradation of the receiver(s)?

If you hear the receiver COR relay click when using the other 
transmitter, reduce the coupling between the antennas or otherwise 
prevent the excess energy from reaching the receiver input.

73,

Lyle KK7P

 ...can you please elaborate on what is sufficient antenna separation when a 
 transmitter is operating on another antenna?

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[d...@lightstream.net]

I've been using the Array Solutions device (AS-RXFEP) for over a year on
my K3. I have a homebrew magnetic loop connected to the K3 sub rx, with
the loop located about 15 feet from the transmitting ground plane (about
6' above ground). Prior to installing the AS-RXFEP, the sub rx COR would
be triggered with anything over about 25 watts. With the AS-RXFEP in
place, I can run the KPA-500 at 600W without the COR ever tripping.

The S-RXFEP has no relays, requires no supply voltage, and is simply
installed in between the rx antenna and the sub rx antenna input via a
pair of SO-239 connectors.

73, Dale
WA8SRA




 There are a couple of things to think about. How much power are you
 running?
 How close is the receive antenna to your transmitting antenna? Does your
 receive only antenna possibly have an interface that can connect to the
 key
 out of the K3? (My Pixel Loop antenna has such a device)

 You can also try it out and listen for a clicking noise from the carrier
 operated relay inside the K3. It is a protective relay that will energize
 if
 it sees too much power coming in on the RX antenna input. If you hear it
 clicking then it is a good idea to consider additional protection.

 There are external protective devices available that you can purchase. DX
 Engineering and Array Solutions have them I think there are others out
 there.

 http://www.dxengineering.com/search/department/antennas/section/receive-antennas-and-arrays/product-line/dx-engineering-receiver-guard-5000-electronic-rf-limiters?autoview=SKUN=4294953330%2B4294951218sortby=Defaultsortorder=Ascending

 http://www.arraysolutions.com/Products/as_rxfep.htm

 73,
 Mike K2MK


 Elecraft mailing list wrote
 I ordered the sub receiver and in the conversation with Elecraft I was
 informed that it is good idea to build a device that would short the
 dedicated RX antenna to ground to protect it during transmit.
 The simple way would be a relay but I'd rather not hear a relay click
 with
 each transmission.
 I was wondering what others are using to accomplish this.

 Thank you



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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Don Wilhelm]

Phil,

The K3 ANT1 and ANT2 connections are not of concern, they are protected 
by the T/R circuits in the K3.


The AUX ant is protected by a COR (Carrier Operated Relay) that will 
activate if there is too much RF being brought in by the AUX antenna.  
While it should protect the K3 (and KRX3) from damage, you will hear the 
COR clicking as you transmit.
If you do hear such relay clicking, the cure is to move the RX antenna 
further out of the field of the TX antenna, or provide some form of 
external 'protection' such as shorting the RX antenna input during TX or 
alternate means of disconnecting the RX antenna during RX.


73,
Don W3FPR

On 1/27/2015 4:41 PM, Phil Anderson wrote:
Perhaps you could clarify protection on RX inputs. I have the KRX3 and 
run the internal 100 watt amp.
Sometimes I share the same antenna with TX,  ANT 1 or ANT2. I assumed 
there that the RX is protected.
Sometimes I use the AUX antenna for diversity receive. Is that input 
not protected? When does it need to be?




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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Ken]

Wayne,   can you please elaborate on what is sufficient antenna separation when 
a transmitter is operating on another antenna?   I ask this because my K3 
returning from a trip to Elecraft after damaging the front end.   I assume it 
happened when I was testing an old boat anchor (Viking II, 100 watts) on an 
antenna 15’ feet away and parallel to the K3’s antenna.  How far is enough?  
Yes, I realize that’s probably too close but at this point I am concerned.   

I know the K3 is popular in Field Day and DXpedition operation so obviously it 
can work, but I’d like some guidelines.  

Thanks,

Ken WA8JXM 

 On Jan 27, 2015, at 2:07 PM, Wayne Burdick n...@elecraft.com wrote:
 
 This would only be necessary if you're running high power and/or the antenna 
 to be used with the KRX3 is close to the transmit antenna. Could you describe 
 your antenna system?
 
 Wayne
 N6KR

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[hsherriff]

Yesplease Wayne.


Sent from my Verizon Wireless 4G LTE smartphone

div Original message /divdivFrom: Ken wa8...@gmail.com 
/divdivDate:01/27/2015  5:53 PM  (GMT-05:00) /divdivTo: Wayne Burdick 
n...@elecraft.com /divdivCc: Elecraft Reflector 
elecraft@mailman.qth.net /divdivSubject: Re: [Elecraft] K3 Sub Receiver 
and protecting the Sub RX input /divdiv
/divWayne,   can you please elaborate on what is sufficient antenna 
separation when a transmitter is operating on another antenna?   I ask this 
because my K3 returning from a trip to Elecraft after damaging the front end.   
I assume it happened when I was testing an old boat anchor (Viking II, 100 
watts) on an antenna 15’ feet away and parallel to the K3’s antenna.  How far 
is enough?  Yes, I realize that’s probably too close but at this point I am 
concerned.   

I know the K3 is popular in Field Day and DXpedition operation so obviously it 
can work, but I’d like some guidelines.  

Thanks,

Ken WA8JXM 

 On Jan 27, 2015, at 2:07 PM, Wayne Burdick n...@elecraft.com wrote:
 
 This would only be necessary if you're running high power and/or the antenna 
 to be used with the KRX3 is close to the transmit antenna. Could you describe 
 your antenna system?
 
 Wayne
 N6KR

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Don Wilhelm]

Ken,

I am not Wayne, but I can tell you that you question does not have a 
single answer.
Do you run an amplifier?  More power requires greater separation between 
the TX and the RX antennas.


Another factor is the orientation of the antennas.  An RX antenna in the 
null pattern of the TX antenna will not pick up a lot of TX RF, while an 
RX antenna broadside to the full TX antenna RF will be a problem.


If the antennas have orthogonal polarity (one horizontal and one 
vertical), that will reduce the pickup on the RX antenna during TX.


So a lot depends on the type of RX antenna, its orientation, its 
directivity, and a vast array of other factors.  There is no one answer 
to your question, it all depends on your installation.


73,
Don W3FPR

On 1/27/2015 5:53 PM, Ken wrote:

Wayne,   can you please elaborate on what is sufficient antenna separation when 
a transmitter is operating on another antenna?   I ask this because my K3 
returning from a trip to Elecraft after damaging the front end.   I assume it 
happened when I was testing an old boat anchor (Viking II, 100 watts) on an 
antenna 15’ feet away and parallel to the K3’s antenna.  How far is enough?  
Yes, I realize that’s probably too close but at this point I am concerned.

I know the K3 is popular in Field Day and DXpedition operation so obviously it 
can work, but I’d like some guidelines.




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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Lyle Johnson]

In general, ensure the coupled energy into the receiver antenna 
connector is less than 1 watt under absolute worst case conditions, and 
preferably under 100 mW, and your receiver should be OK.


Put another way, the antennas should be separated by 40 dB if running up 
to 1 kW, 30 dB if running up to 100W and 20 dB if running up to 10W.  
You might get away with 10 dB less coupling. If you can't get this level 
of isolation by physical separation and/or orientation of the antennas, 
provide some external means of reducing the signal to the receiver input.


Yes, the K3 inputs are tested to higher levels than this, but why stress 
the radio and risk damage to or degradation of the receiver(s)?


If you hear the receiver COR relay click when using the other 
transmitter, reduce the coupling between the antennas or otherwise 
prevent the excess energy from reaching the receiver input.


73,

Lyle KK7P


...can you please elaborate on what is sufficient antenna separation when a 
transmitter is operating on another antenna?


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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Mike K2MK]

There are a couple of things to think about. How much power are you running?
How close is the receive antenna to your transmitting antenna? Does your
receive only antenna possibly have an interface that can connect to the key
out of the K3? (My Pixel Loop antenna has such a device)

You can also try it out and listen for a clicking noise from the carrier
operated relay inside the K3. It is a protective relay that will energize if
it sees too much power coming in on the RX antenna input. If you hear it
clicking then it is a good idea to consider additional protection.

There are external protective devices available that you can purchase. DX
Engineering and Array Solutions have them I think there are others out
there.

http://www.dxengineering.com/search/department/antennas/section/receive-antennas-and-arrays/product-line/dx-engineering-receiver-guard-5000-electronic-rf-limiters?autoview=SKUN=4294953330%2B4294951218sortby=Defaultsortorder=Ascending

http://www.arraysolutions.com/Products/as_rxfep.htm

73,
Mike K2MK


Elecraft mailing list wrote
 I ordered the sub receiver and in the conversation with Elecraft I was
 informed that it is good idea to build a device that would short the
 dedicated RX antenna to ground to protect it during transmit.
 The simple way would be a relay but I'd rather not hear a relay click with
 each transmission.
 I was wondering what others are using to accomplish this.
 
 Thank you





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http://elecraft.365791.n2.nabble.com/K3-Sub-Receiver-and-protecting-the-Sub-RX-input-tp7597571p7597578.html
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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Edward R Cole]

An alternative to a relay (which should ground the sub-receiver ant) 
is using a pin diode to short the input.


Typically one uses a coupling capacitor to isolate the antenna from 
the circuit which will have a low value of dc bias to turn on the pin 
diode which will conduct to ground and short the antenna ckt.  I 
assume the K3 sub-receiver antenna ckt is capacitively coupled to 
isolate it dc wise.  Use a RF choke between pin diode and antenna to 
keep from loading the antenna in normal use.  hint: google pin diode 
antenna switching.


Use KEY OUT ckt from the K3 to control the pin diode via a transistor 
switch that applies the bias thru a dropping resistor.  You will have 
to do some design work - not plug-n-play freebie


Many ham rigs that do QSK use pin-diode TR switching.

73, Ed - KL7UW
http://www.kl7uw.com
Kits made by KL7UW
Dubus Mag business:
dubus...@gmail.com

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Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input

[Harry Yingst via Elecraft]

Thank you
Sounds like that may be my solution


  From: d...@lightstream.net d...@lightstream.net
 To: elecraft@mailman.qth.net 
 Sent: Tuesday, January 27, 2015 9:11 PM
 Subject: Re: [Elecraft] K3 Sub Receiver and protecting the Sub RX input
   
I've been using the Array Solutions device (AS-RXFEP) for over a year on
my K3. I have a homebrew magnetic loop connected to the K3 sub rx, with
the loop located about 15 feet from the transmitting ground plane (about
6' above ground). Prior to installing the AS-RXFEP, the sub rx COR would
be triggered with anything over about 25 watts. With the AS-RXFEP in
place, I can run the KPA-500 at 600W without the COR ever tripping.

The S-RXFEP has no relays, requires no supply voltage, and is simply
installed in between the rx antenna and the sub rx antenna input via a
pair of SO-239 connectors.

73, Dale
WA8SRA




 There are a couple of things to think about. How much power are you
 running?
 How close is the receive antenna to your transmitting antenna? Does your
 receive only antenna possibly have an interface that can connect to the
 key
 out of the K3? (My Pixel Loop antenna has such a device)

 You can also try it out and listen for a clicking noise from the carrier
 operated relay inside the K3. It is a protective relay that will energize
 if
 it sees too much power coming in on the RX antenna input. If you hear it
 clicking then it is a good idea to consider additional protection.

 There are external protective devices available that you can purchase. DX
 Engineering and Array Solutions have them I think there are others out
 there.

 http://www.dxengineering.com/search/department/antennas/section/receive-antennas-and-arrays/product-line/dx-engineering-receiver-guard-5000-electronic-rf-limiters?autoview=SKUN=4294953330%2B4294951218sortby=Defaultsortorder=Ascending

 http://www.arraysolutions.com/Products/as_rxfep.htm

 73,
 Mike K2MK


 Elecraft mailing list wrote
 I ordered the sub receiver and in the conversation with Elecraft I was
 informed that it is good idea to build a device that would short the


 dedicated RX antenna to ground to protect it during transmit.
 The simple way would be a relay but I'd rather not hear a relay click
 with
 each transmission.
 I was wondering what others are using to accomplish this.

 Thank you



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Re: [Elecraft] K3 sub receiver stopped working - where to start

[Mike K2MK]

Hi Mike,

The most common (and easiest to correct) reason for this is incorrect
antenna selection for the SUB RX. If you hold the BSET button it will
momentarily flash which antenna is being used by the SUB RX on the lower
display. You probably want to be using the same antenna as your MAIN RX so
you want to see MAIN on the lower display and not AUX.

73,
Mike K2MK


mike wrote
 Sub receiver all of sudden does not produce signal. Audio is not dead, but
 cannot hear the VFO B signal in split operation. Where should I start to
 find what has gone wrong?  ..mike





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Re: [Elecraft] K3 sub receiver stopped working - where to start --FIXED

[mike]

Dick, K8ZTT has the winning answer:

Turn on the sub receiver, then check to see what input you are using for
the sub.   Turn on the sub receiver, then HOLD (not push)  the RX/ANT
button (next to the power switch) and make sure you are not using the AUX
input (it needs to be MAIN). The one in use comes into view in the bottom
right side of the readout  (to the right of the XFIL window). Dick,  K8ZTT

That was it. All is back to perfect working order. Thanks es 73  ..mike 
AI6II




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Re: [Elecraft] K3 sub receiver gradual noise level increase

[Stewart]

Hi Graham,
I had a problem early on with my K3 S/N 307.

The Sub RX mixer was intermittently noisy. I verified this by swapping the 
mixer 
with the one in the Main RX.

Elecraft replaced it FOC.

Hope this helps.

73
Stewart G3RXQ

P.S. Lot's of bad signals in SSB CQWW. Obviously they are not using K3's !

On Sat, 25 Oct 2014 16:17:36 +0100, G4FNL wrote:
 Guys
 I have a K3 that has developed what I think is a fault on the sub-receiver. 
 It 
is S/N 883. MCU Firmware is at 4.86

 If I switch on the K3 and enable the sub receiver, I hear equally as well as 
the main receiver but after a few seconds, an increasingly loud noise level 
builds up and the signal level drops down (in this situation, the noise remains 
present even when the aerial is disconnected). The main receiver operates 
without any such issues.

 I  have saved a small video file showing the effect and how switching the sub 
receiver off and then immediately back on restores the receiver, until the 
noise 
returns and the signal drops out once again.  See
 https://dl.dropboxusercontent.com/u/43142183/2.wmv

 I have checked internal TMP connections and also the multi-pin connectors on 
the sub receiver board, but having put things back together the situation 
remains unchanged.

 Has anyone had a similar fault and if so, what was the solution?

 73 Graham G4FNL

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Re: [Elecraft] K3 sub receiver no signals

[Bruce Hammond]

This thread is a bit old, may have been solved. In case it was not, I had a
similar problem getting sub Rx to work and it was cockpit error. Try holding
*A/B* button to get *BSET*, then look in display at what antenna is
selected. If different from MAIN ANT or what you want it to be, push *ANT*
button until you get what you want.



-
73 de KK7EL Bruce
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Re: [Elecraft] K3 sub receiver no signals

[vtdave]

I just finished building the K3 with the sub receiver. All went well until I
fired up the rig and found that I was not getting a signal in the sub
receiver.. I had white noise but no signal. I checked all the wiring that
went from the main board to the sub receiver and all was in place and tight. 

I put another antenna on the aux antenna jack and got normal operation from
the sub receiver! So now I know the sub works but still no signal using the
main antenna. All firmware is updated and initialization went as it should
via the op manual. 

I called Elecraft with the problem and they said it's most likely that the
problem stems from the two sets of pins on the sub module not fully mating
with the small sub in and sub out boards that plug into the main board. They
said this is a common problem when installing the sub module as the fit it
tight (!). 

I re-positioned the sub module after monkeying around with the TMP cables
and made sure all the pins fully mated with the sub in/out boards. I fired
up the rig and my sub receiver worked off the main antenna! 

Before you start tearing the sub receiver apart, make sure those two sets of
pins mate correctly and you may save your self alot of work and agita! 

  73!...Dave



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Re: [Elecraft] K3 Sub Receiver Problems

[ON4YVO]

I got the sub receiver fixed.  The previous owner had the filter inserted the
wrong way.  By this the signal pins are shorted to ground through by the
filter.

I discovered this by measuring on the pins of the filters.  On the selected
filter the signal pins carry 5 volt DC.  The DC is blocked by capacitors on
the filter circuit.

When having few resources, you can swap the NB and mixer print and also
change coaxes to swap main and sub receiver. 



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Re: [Elecraft] K3 Sub Receiver Problems

[Guy Olinger K2AV]

You need to call Elecraft Tech Support on this problem before you go
further.  They don't live on the reflector.  Someone knowledgeable can walk
you through a series of steps to isolate what is going on.  There are too
many possibilities to work this efficiently over email.

Do not go soldering things until you have called Elecraft.  It could easily
be something you misread in the manual, or a misconception about how it
works with the components you have.  Or it can be an improperly seated tiny
plug on those coax leads.  Everyone has done that.  There is a certain
feel to it when it is really seated.

Frankly 9 S units usually means that something is not connected at all.  9
S units down means all you are hearing is capacitive coupling.  BOTH the
cable connections AND the state of the RX hold button must match.  But
there is a pile of possibilities.

Call Elecraft and have them walk you through.

73, Guy.

On Thu, Jan 10, 2013 at 11:32 PM, KGØUS kg...@sbcglobal.net wrote:



 That's why I took the effort to measure the resistors.  R43 is 51 Ohm, R37
 and R45 are both 63 Ohm.

 From what you measured above, I can tell you that your R43, R37, and R45
 resistors are all good.

 Please take a closer look at the schematic.  When you measure R43, you are
 actually measuring R43 in parallel with R37 and R45 in series.  This would
 be 68 || (100 + 100) = 50.74 Ohms.

 When you measure R37 or R45, you are actually measuring 100 || (68 + 100) =
 62.68 Ohms.

 I plan to make a few more measurements this weekend and was hoping for some
 guidance from the experts.  I have been getting the cold shoulder here.

 I will make a few more measurements here but I have limited resources at
 home.  I have unlimited resources at work but I am not allowed to work on
 home equipment.

 I have four choices:
 1.)  Try to fix it myself but I will need to ask a friend if I can use his
 surface mount solder station.
 2.)  Do nothing, remove it, or live with it.
 3.)  By another subreceiver kit for $600.
 4.)  Send it in for repair.

 Good luck,

 Dave KG0US





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Re: [Elecraft] K3 Sub Receiver Problems

[Eric Swartz - WA6HHQ, Elecraft]

Or email k3supp...@elecraft.com

73,

Eric
---
www.elecraft.com

On 1/11/2013 10:09 AM, Guy Olinger K2AV wrote:

You need to call Elecraft Tech Support on this problem before you go
further.  They don't live on the reflector.


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Re: [Elecraft] K3 Sub Receiver Problems

[KGØUS]

That's why I took the effort to measure the resistors.  R43 is 51 Ohm, R37
and R45 are both 63 Ohm.

From what you measured above, I can tell you that your R43, R37, and R45
resistors are all good.

Please take a closer look at the schematic.  When you measure R43, you are
actually measuring R43 in parallel with R37 and R45 in series.  This would
be 68 || (100 + 100) = 50.74 Ohms.

When you measure R37 or R45, you are actually measuring 100 || (68 + 100) =
62.68 Ohms.

I plan to make a few more measurements this weekend and was hoping for some
guidance from the experts.  I have been getting the cold shoulder here.

I will make a few more measurements here but I have limited resources at
home.  I have unlimited resources at work but I am not allowed to work on
home equipment.  

I have four choices:
1.)  Try to fix it myself but I will need to ask a friend if I can use his
surface mount solder station.
2.)  Do nothing, remove it, or live with it.
3.)  By another subreceiver kit for $600.
4.)  Send it in for repair.

Good luck,

Dave KG0US





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Re: [Elecraft] K3 Sub Receiver Problems

[Matt Zilmer]

Hi Dave,

To some extent, my sub-RX experience duplicated yours.  After a lot of
experimentation, I determined that the sub's antenna has a number of
differences from the main antenna.  This is the purpose (in the case
of diversity reception) anyway: To reduce fading effects.  For SO2V
ops, having such differences may not be desirable - because you want
to use each receiver in a similar way listening to signals on and off
your main's frequency.

I can only use my sub's antenna on 60, 40, and 30m because it's a full
length 40m 1/4-wave vertical.  The main antenna is a doublet cut long
for 80m.  There is a world of difference between these two antennas.
On bands where the vertical isn't even close to resonance, it doesn't
work very well.  Not too much of a surprise when one thinks about it.

I mostly use the subRX for diversity reception.  This is quite a
different use case than SO2V.  For SO2V, you might want to use a subRX
antenna similar to your main RX.  Of course, you'd probably need to
separate them a fair distance.

One suggestion for you is to check the sensitivity of each receiver,
independently of the other and not considering antennas.  This should
be reassuring to you, that the subRX isn't deaf -and- that most
differences you hear are due to antennas being different.  Using one
of Elecraft's XG (XG2 or XG3) signal generators might of value to you.
The XG2 is a kit but it's inexpensive and kinda fun to assemble (easy
enough as well).  The XG2 uses fixed frequencies on 80, 40, and 20m.
The XG3 is a lot more flexible -programmable from a PC- and it comes
already assembled.

I used a regular HP signal generator to measure MDS on each receiver.
I found that they both meet the rated senstivity spec, and are matched
within 1 or 2 dB of each other.  You could do the same with one of the
XG signal generators.

Not everyone has a lab full of test equipment around the shack.  The
XG devices can help make up for this.  

Just a suggestion.  

73,
matt W6NIA

On Wed, 02 Jan 2013 21:27:12 -0800 (PST), you wrote:

I tried to work the recent 10 meter contest using SO2V but I found that weaker 
signals were virtually uncopyable when using the sub receiver.  The main 
receiver appears to be working correctly.
 
The sub receiver appears to have problems:
 
I have noticed that the PRE does nothing when pressed after pressing the SUB 
and 
then pressing the BSET button.  Pressing the PRE on the main receiver, I see a 
one or two S unit increase on the meter as well as hearing an increase in 
noise.  I see no increase on the S meter and hear no noise increase when 
activating the PRE on the sub receiver.
 
I have had a constant S9 noise on the 75 meter DX window since our light snow 
the other night.  On a clear frequency I notice that the sub receiver only 
shows 
S6 on the meter.  I did use the RX ANT button to switch to Main from Aux to 
eliminate differences in receive antennas.  I also physically swapped the 
antennas in the back to verify the difference in sensitivity.  I used a PL259 
to 
BNC adapter to make the swap.
 
I also noticed that the sub receiver audio and S meter goes completely dead 
when 
I engage the ATT using BSET on the sub receiver.
 
I successfully ran the RF gain cal but I do not have a calibrated source.  
Without the calibrated source, the procedure only uses factory default values.
 
I am not sure if this is related but occasionally I have been getting the 
following error:
 
E 040AA8  err dse
 
Anyone know what the error code means?
 
73,
 
Dave KG0US
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Re: [Elecraft] K3 Sub receiver

[K7MDL]

The internal 2M transverter IF connects into the the Main receiver input
chain downstream of the Main/RX antenna switch.  So it can only be used on
the Main receiver.  In fact the ATT and Preamp works as normal as the whole
input side is pretty much connected.  

I have other 2M transverters here and have at times hooked them up to the
alternate antenna input (ANT2) and it is routed to the Sub RX.  The
advantage of this is it works with either receiver but with the XV144
external unit it does not cover the FM portion of the band and does not
benefit from the Reflock feature.  With both transverters connected (with
separate antennas or RX only with splitter) I can monitor 2 ends of the band
at once and use the internal as the primary.   I went further and brought
out to the back panel my ANT 2 internal connection to the SubRX and the
SubRX connection and normally have a coax jumper between them.  I can pull
the jumper and insert any transverter (or RX splitter output) and not worry
about transmitting into it at high power. :-)   I actually rarely use it but
it is there when I need it.

I see no way to enter frequency directly in Bset or other method than A/B
swapping.

- Mike





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Re: [Elecraft] K3: Sub receiver question

[Oliver Dröse]

Hi David,

in standard configuration you can only use one transverter at a time, no 
matter if internal or external (the internal K144XV is switched from the 
same XV3A board as the external transverters).

73, Olli - DH8BQA



- Original Message - 
From: David Pratt da...@g4dmp.fsnet.co.uk
To: elecraft@mailman.qth.net
Sent: Monday, August 06, 2012 3:35 PM
Subject: [Elecraft] K3: Sub receiver question


I am using the internal K144XV 2-metre transverter at VFO B and an
 external XV50 (modified for 4 metres) at VFO A.

 Switching in the SUB I can hear VFO A (4 metres) okay but, although I
 can hear the K144XV noise level when advancing the SUB RF  AF gain
 controls, I do not hear any signals. I do have a 2 metre antenna in the
 ANT3 socket.

 Am I doing something wrong ?  I would have expected to be able to
 receive 2 metres and 4 metres at the same time.

 David G4DMP

 -- 
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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 Von AVG uberpruft - www.avg.de
 Version: 2012.0.2197 / Virendatenbank: 2437/5179 - Ausgabedatum: 
 05.08.2012
 

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Re: [Elecraft] K3: Sub receiver question

[David Pratt]

Thank you, Olli, that is useful to know.

73 de David G4DMP

In a recent message, Oliver Dröse dro...@necg.de writes
Hi David,

in standard configuration you can only use one transverter at a time,
no matter if internal or external (the internal K144XV is switched from
the same XV3A board as the external transverters).
-- 
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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Re: [Elecraft] K3 Sub Receiver / Diversity Question

[Jim Bennett]

Thanks for the several replies I got on this Diversity Mode newbie question. 
Now I understand, and after reading those replies, took a closer listen - sure 
enough, the two receivers ARE on the same (VFO A) frequency. I was reading too 
much into the instructions! And yes, it is obvious now why the two VFO displays 
aren't in sync until / unless one wants them to be and that is easy enough to 
do.

73, Jim / W6JHB


On   Sunday, Jul 29, 2012, at  Sunday, 3:17 PM, Jim Bennett wrote:

 Hi -
 
 I just finished installing the sub receiver in my K3 # 4359. Set up the 
 filters, sub synth, etc.The subrx book sez (page 44), that if you press  
 hold the SUB for 2 seconds or more it will go into Diversity mode. That it 
 does. It also sez that the kHz dot on VFO A will flash, to indicate 
 Diversity mode. That it does. But it also sez on page 45 that when this is 
 done, it sets the sub to the same frequency as the main (VFO A). It does NOT 
 - frequency in VFO B stays right where it was. I did find a way to make it 
 work, but I'm wondering if the book is wrong, if I'm not reading it 
 correctly, or if there is a screw-up in the firmware. I did download the 
 most recent non-beta f/w into the K3.
 
 On my K3 I have to first do the AB twice to get both VFO's on the same 
 freq, with the same settings, then go into Diversity mode, and finally press 
 the SUB button again for less than 2 seconds to make it Link. This keeps 
 it in Diversity mode and Links the two VFO's on the same frequency. If it 
 worked as the book sez on page 45, it'd be a lot easier. Any suggestions?
 
 Jim / W6JHB
 
 
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Re: [Elecraft] K3 Sub Receiver / Diversity Question

[iain macdonnell - N6ML]

On Sun, Jul 29, 2012 at 3:17 PM, Jim Bennett w6...@mac.com wrote:
 Hi -

 I just finished installing the sub receiver in my K3 # 4359. Set up the 
 filters, sub synth, etc.The subrx book sez (page 44), that if you press  
 hold the SUB for 2 seconds or more it will go into Diversity mode. That it 
 does. It also sez that the kHz dot on VFO A will flash, to indicate 
 Diversity mode. That it does. But it also sez on page 45 that when this is 
 done, it sets the sub to the same frequency as the main (VFO A). It does NOT 
 - frequency in VFO B stays right where it was. I did find a way to make it 
 work, but I'm wondering if the book is wrong, if I'm not reading it 
 correctly, or if there is a screw-up in the firmware. I did download the 
 most recent non-beta f/w into the K3.

 On my K3 I have to first do the AB twice to get both VFO's on the same 
 freq, with the same settings, then go into Diversity mode, and finally press 
 the SUB button again for less than 2 seconds to make it Link. This keeps 
 it in Diversity mode and Links the two VFO's on the same frequency. If it 
 worked as the book sez on page 45, it'd be a lot easier. Any suggestions?

Jim,

When in diversity mode, the VFO B display does not represent the
Sub-RX (as it does not when the Sub-RX is turned off). It's done this
way because you can operate split while diversity is on - i.e. a TX
frequency that is different from the frequency that the two receivers
are locked together on.

So, basically, ignore VFO B when experimenting with diversity RX.

73,

~iain / N6ML
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Re: [Elecraft] K3 Sub Receiver / Diversity Question

[Guy Olinger K2AV]

What the book says means that the SubRX is now controlled by VFO A.  VFO B
is used for split TX.It does not mean that the readout on VFO B changes
to whatever is on VFO A.   73, Guy.

On Sun, Jul 29, 2012 at 6:17 PM, Jim Bennett w6...@mac.com wrote:

 Hi -

  I just finished installing the sub receiver in my K3 # 4359. Set up the
 filters, sub synth, etc.The subrx book sez (page 44), that if you press 
 hold the SUB for 2 seconds or more it will go into Diversity mode. That it
 does. It also sez that the kHz dot on VFO A will flash, to indicate
 Diversity mode. That it does. But it also sez on page 45 that when this is
 done, it sets the sub to the same frequency as the main (VFO A). It does
 NOT - frequency in VFO B stays right where it was. I did find a way to make
 it work, but I'm wondering if the book is wrong, if I'm not reading it
 correctly, or if there is a screw-up in the firmware. I did download the
 most recent non-beta f/w into the K3.
 
  On my K3 I have to first do the AB twice to get both VFO's on the same
 freq, with the same settings, then go into Diversity mode, and finally
 press the SUB button again for less than 2 seconds to make it Link. This
 keeps it in Diversity mode and Links the two VFO's on the same frequency.
 If it worked as the book sez on page 45, it'd be a lot easier. Any
 suggestions?

 Jim / W6JHB


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Re: [Elecraft] K3 sub receiver no signals

[Mike K2MK]

Hi Mike,

This question comes up quite often on the reflector and it is usually
incorrect antenna selection as others have commented. But there are also
several other things that could be amiss. You could have the RF gain for the
sub turned down. It's the outer ring on the RF gain knob. Assuming that you
are using headphones you should also check to see how you have the audio
gain knobs set up. They can be configured so that the outer AF knob is a sub
volume control or configured so that it is a left/right balance control.
Another thought is that you have the sub RX filters configured incorrectly.
You could also have the sub set up in diversity mode. In diversity you'll be
listening to VFO A in both ears regardless of what is displayed in VFO B.
The tip off is a blinking decimal point (the right decimal point) in the VFO
A display.

73,
Mike K2MK



w0mu wrote
 
 I installed this 2nd receiver quite some time ago.  I probably never 
 checked but i hear background noise in the sub receiver but no signals.  
 I suspect this is something stupid, can someone point me in a direction.
 
 -- 
 Mike W0MU
 


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Re: [Elecraft] K3 sub receiver no signals

[Cady, Fred]

Hi Mike,
Is it dead-dead or do you get audio noise when turning the audio/rf
gain. If it is dead-dead it might be the l-mix-r setting to a-a or
something other than a-b.
Also, if you have SPKRS=2 and are listening with the internal speaker
you get the main audio only.
Hope you find it.
Cheers,
Fred KE7X
 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W0MU Mike
Fatchett
Sent: Sunday, July 01, 2012 10:50 PM
To: Bill Conkling
Cc: 'Elecraft Reflector'
Subject: Re: [Elecraft] K3 sub receiver no signals

The 2nd receiver was hooked up to the bnc aux connector.  I had to
change that.  However still no signals.  I have tried every combination
of antennas etc.

I suspect maybe there was an issue when I uploaded the new firmware.


Mike W0MU

W0MU-1 CC Cluster w0mu.net

On 7/1/2012 9:33 PM, Bill Conkling wrote:
 Check antenna wiring, and make sure you have selected an antenna for 
 the SUB.

 ...bill  nr4c

 -Original Message-
 From: W0MU Mike Fatchett [mailto:w...@w0mu.com]
 Sent: Sunday, July 01, 2012 10:32 PM
 To: Elecraft Reflector
 Subject: [Elecraft] K3 sub receiver no signals

 I installed this 2nd receiver quite some time ago.  I probably never 
 checked but i hear background noise in the sub receiver but no
signals.
 I suspect this is something stupid, can someone point me in a
direction.



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Re: [Elecraft] K3 sub receiver no signals

[nr4c]

I saw that someone else suggested checking all the cabling.  Good idea. 
Also, press the AB switch twice quickly (should see AB ALL in VFO 
B window) to make sure both main and sub are on same freq, filters etc.

Oh, yeah, lyou DID turn ON the Sub-rec'ver.  Didn't you?

Let's see, check internal cabling, Antenna, settings.  Oh, how is your 
RF/AF gain controls set up.  I have separate RF gains, but the AF gains 
are set up so that the little knob is volume, and the larger one is a 
fader.  How are your set up?

./...bill  nr4c
On Sun, 01 Jul 2012 22:49:36 -0600, W0MU Mike Fatchett wrote:
 The 2nd receiver was hooked up to the bnc aux connector.  I had to
 change that.  However still no signals.  I have tried every
 combination of antennas etc.

 I suspect maybe there was an issue when I uploaded the new firmware.


 Mike W0MU

 W0MU-1 CC Cluster w0mu.net

 On 7/1/2012 9:33 PM, Bill Conkling wrote:
 Check antenna wiring, and make sure you have selected an antenna for 
 the
 SUB.

 ...bill  nr4c

 -Original Message-
 From: W0MU Mike Fatchett [mailto:w...@w0mu.com]
 Sent: Sunday, July 01, 2012 10:32 PM
 To: Elecraft Reflector
 Subject: [Elecraft] K3 sub receiver no signals

 I installed this 2nd receiver quite some time ago.  I probably never
 checked but i hear background noise in the sub receiver but no 
 signals.
 I suspect this is something stupid, can someone point me in a 
 direction.


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Re: [Elecraft] K3 sub receiver no signals

[NH7RO]

Hi Mike; I had the same problem a number of months ago and it was so
frustrating I finally removed the sub rcvr and sent it off to Aptos.  The
guys there were very helpful as always but it came back with a perfectly
clean bill of health as they could find nothing wrong with it.

This was after I had checked and rechecked all of the cabling, configured
all the antenna settings about a million times and pulled every last hair
out of my head.  Oh, yes, all the filter settings were fine from the get-go.

When I reinstalled it after coming back from Elecraft the problem was still
there; the sub was still virtually dead as far as the signals were (the
audio level was always fine, just sounded like someone had switched in a
-20db attenuator everytime I went with the SUB on.

I believe what finally fixed it was a total reloading of the firmware and a
recalibration of the VCO (IIRC).

I also set every band's antenna selection regardless of whether or not the
band was IN or OUT to MAIN (making sure that it stayed set on MAIN every
time I checked the settings).

Finally, just when I was about to throw in the towel, the SUB came back to
life!  While I'm not 100% sure I do believe it was one of the calibrations I
performed (VCO calibtration or DSP utility) that did the trick in the nick
of time.

I have been a very happy camper ever since (despite not really knowing what
caused the snafu in the first place; it suddenly went deaf while I was
operating split and chasing a DX pileup...and oops!) and now I appreciate
this little rig more than ever.  I'm still scratching my head over it all
but unless it happens again I may never really know the hows and whys...

Reminds me of the old saying, You never miss your signals until your
sub-receiver dies!

Hope you get it going again right away and I suggest redoing ALL the
calibrations required when the sub is first installed---that may very well
bring it back to life.  Best of luck to you (and I know just how you feel).

73,  Jeff   NH7RO

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Re: [Elecraft] K3 sub receiver no signals

[Ron D'Eau Claire]

Is the antenna connected? Seriously, Mike, there are several menu options
for where the 2nd rx will get its signals. I'd bet you have an unused input
selected. 

The sub receiver gets its RF input either from the main receiver (sharing
ANT 1-2 or RX ANT IN), or from its auxiliary antenna input. If you have a
cable connected to the KRX3 module's AUX input you have the following
choices in the CONFIG menu under KRX3:

ANT=BNC: Specifies that the KRX3's auxiliary antenna source is the AUX RF
BNC jack on the rear panel. This requires that the BNC is installed with its
cable connected KRX3's AUX RF input.

ANT=ATU: Specifies that the KRX3's auxiliary antenna source is the ATU's
non-transmit antenna (1 or 2).Use this setting only if you connected the
KRX3's AUX RF input to the KAT3's TMP jack.

73, Ron AC7AC

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W0MU Mike Fatchett
Sent: Sunday, July 01, 2012 7:32 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 sub receiver no signals

I installed this 2nd receiver quite some time ago.  I probably never checked
but i hear background noise in the sub receiver but no signals.  
I suspect this is something stupid, can someone point me in a direction.

--
Mike W0MU

W0MU-1 CC Cluster w0mu.net

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Re: [Elecraft] K3 sub receiver no signals

[W0MU Mike Fatchett]

I have an antenna connected.  I suspect that I have mis wired the to the 
bnc instead of the main ant.  I will have to check the cabling.  I can't 
believe I never checked this when I built it.

I have KE7X's book and I have tried all the settings.

Mike W0MU

W0MU-1 CC Cluster w0mu.net

On 7/1/2012 9:07 PM, Ron D'Eau Claire wrote:
 Is the antenna connected? Seriously, Mike, there are several menu options
 for where the 2nd rx will get its signals. I'd bet you have an unused input
 selected.

 The sub receiver gets its RF input either from the main receiver (sharing
 ANT 1-2 or RX ANT IN), or from its auxiliary antenna input. If you have a
 cable connected to the KRX3 module's AUX input you have the following
 choices in the CONFIG menu under KRX3:

 ANT=BNC: Specifies that the KRX3's auxiliary antenna source is the AUX RF
 BNC jack on the rear panel. This requires that the BNC is installed with its
 cable connected KRX3's AUX RF input.

 ANT=ATU: Specifies that the KRX3's auxiliary antenna source is the ATU's
 non-transmit antenna (1 or 2).Use this setting only if you connected the
 KRX3's AUX RF input to the KAT3's TMP jack.

 73, Ron AC7AC

 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W0MU Mike Fatchett
 Sent: Sunday, July 01, 2012 7:32 PM
 To: Elecraft Reflector
 Subject: [Elecraft] K3 sub receiver no signals

 I installed this 2nd receiver quite some time ago.  I probably never checked
 but i hear background noise in the sub receiver but no signals.
 I suspect this is something stupid, can someone point me in a direction.

 --
 Mike W0MU

 W0MU-1 CC Cluster w0mu.net

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Re: [Elecraft] K3 sub receiver no signals

[Dick Dievendorff]

It's sometimes a matter of selecting the appropriate antenna input.

Dick, K6KR



-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W0MU Mike Fatchett
Sent: Sunday, July 01, 2012 7:32 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 sub receiver no signals

I installed this 2nd receiver quite some time ago.  I probably never checked
but i hear background noise in the sub receiver but no signals.  
I suspect this is something stupid, can someone point me in a direction.

--
Mike W0MU

W0MU-1 CC Cluster w0mu.net

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Re: [Elecraft] K3 sub receiver no signals

[Bill Conkling]

Check antenna wiring, and make sure you have selected an antenna for the
SUB.

...bill  nr4c

-Original Message-
From: W0MU Mike Fatchett [mailto:w...@w0mu.com] 
Sent: Sunday, July 01, 2012 10:32 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 sub receiver no signals

I installed this 2nd receiver quite some time ago.  I probably never 
checked but i hear background noise in the sub receiver but no signals.  
I suspect this is something stupid, can someone point me in a direction.

-- 
Mike W0MU

W0MU-1 CC Cluster w0mu.net

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Re: [Elecraft] K3 sub receiver no signals

[W0MU Mike Fatchett]

The 2nd receiver was hooked up to the bnc aux connector.  I had to 
change that.  However still no signals.  I have tried every combination 
of antennas etc.

I suspect maybe there was an issue when I uploaded the new firmware.


Mike W0MU

W0MU-1 CC Cluster w0mu.net

On 7/1/2012 9:33 PM, Bill Conkling wrote:
 Check antenna wiring, and make sure you have selected an antenna for the
 SUB.

 ...bill  nr4c

 -Original Message-
 From: W0MU Mike Fatchett [mailto:w...@w0mu.com]
 Sent: Sunday, July 01, 2012 10:32 PM
 To: Elecraft Reflector
 Subject: [Elecraft] K3 sub receiver no signals

 I installed this 2nd receiver quite some time ago.  I probably never
 checked but i hear background noise in the sub receiver but no signals.
 I suspect this is something stupid, can someone point me in a direction.



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Re: [Elecraft] K3 sub receiver no signals

[Matt Zilmer]

You're getting a lot suggestions, but one I haven't seen is to check
the internal cabling to and from the KRX3.  For example, a missing or
disconnected or incorrectly connected frequency reference cable might
be troublesome...

73,
matt W6NIA

On Sun, 01 Jul 2012 23:33:54 -0400, you wrote:

Check antenna wiring, and make sure you have selected an antenna for the
SUB.

...bill  nr4c

-Original Message-
From: W0MU Mike Fatchett [mailto:w...@w0mu.com] 
Sent: Sunday, July 01, 2012 10:32 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 sub receiver no signals

I installed this 2nd receiver quite some time ago.  I probably never 
checked but i hear background noise in the sub receiver but no signals.  
I suspect this is something stupid, can someone point me in a direction.
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Re: [Elecraft] K3 sub receiver

[iain macdonnell - N6ML]

If you're interesting in chasing DXpeditions that run split pileups
(listening up), the sub-RX is very useful for tracking where they're
listening, so you can be calling where you're likely to be heard -
listen to the DX on one receiver and tune around with the other,
looking for the guy giving a 599 report or look for a hole
where no one else is calling.

The sub-RX could also be used to monitor some calling frequency,
perhaps even on another band, as you operate with the main-RX.

If you're not interested in those styles of operating, you probably
don't need the KRX3.

73,

~iain / N6ML



On Wed, Feb 8, 2012 at 6:12 PM,  k...@att.net wrote:
 My K3/100 kit arrives tomorrow.  I did not order the sub receiver. I have 
 only a vertical here and have some antenna restrictions (height) I use a 
 SteppIR BigIR and it works great for me with my height restriction.  So, 
 unless one of you can explain to me why I should have the sub receiver with 
 only one antenna, I'm leaving it the with one!  I'm sure I don't understand 
 receiver diversity since I never heard of it until recently.  Guide me!

 John KE4D
 K3 SN 

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Re: [Elecraft] K3 sub receiver

[Rick Bates]

Hi John,

For one it makes working DX a bit easier.  Not only can you work split, with
the second receiver, you can hear BOTH sides of the split.  Big deal?  Well
for one thing that ability allows you to figure out the pattern of the DX
station (moving up/down?).  That makes you more effective in operating and
increases your chances.

Then if you're a tailgater, you're spot on the attack when the other station
is done.  (I don't approve of tailgating, but some DX'ers allow it.)

It's 'secrets' like this that add up to greater success.  Every little edge
helps.

Rick WA6NHC

As for diversity, it's great for weak signals as each antenna 'fades' at
different moments but your brain glues them together so you can hear more.
A simple loop or wire antenna would be sufficient additions to your SteppIR.

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of k...@att.net
Sent: Wednesday, February 08, 2012 6:12 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 sub receiver

My K3/100 kit arrives tomorrow.  I did not order the sub receiver. I have
only a vertical here and have some antenna restrictions (height) I use a
SteppIR BigIR and it works great for me with my height restriction.  So,
unless one of you can explain to me why I should have the sub receiver with
only one antenna, I'm leaving it the with one!  I'm sure I don't understand
receiver diversity since I never heard of it until recently.  Guide me!

John KE4D
K3 SN 
 

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Re: [Elecraft] K3 sub receiver

[Joe K2UF]

John,

Depending on your operating interest you may or may not need/want the second
receiver.  If you do now or in the future chase DX the 2nd rcvr is almost
required to work stations that xmit on one freq. and listen on another freq.
a couple of Khz up or down.

Regardless of your operating interest you WILL enjoy building and operating
your new radio.

Enjoy!!

73  Joe K2UF  (K3#5057 +  P3#1000 + KPA500#0576 + KAT500#(some day))

No trees were harmed in the sending of this e-mail; however, many electrons
were inconvenienced.


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of k...@att.net
Sent: Wednesday, February 08, 2012 9:12 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 sub receiver

My K3/100 kit arrives tomorrow.  I did not order the sub receiver. I have
only a vertical here and have some antenna restrictions (height) I use a
SteppIR BigIR and it works great for me with my height restriction.  So,
unless one of you can explain to me why I should have the sub receiver with
only one antenna, I'm leaving it the with one!  I'm sure I don't understand
receiver diversity since I never heard of it until recently.  Guide me!

John KE4D
K3 SN 
 
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Re: [Elecraft] [K3] Sub-receiver with one antenna jack

[Bill W4ZV]

John Harper AE5X wrote
 
 If I install the sub-rx, what is the penalty in terms of MDS due to the
 fact that both 
 the main and sub rx will share the same antenna?
 

3 dB splitter loss when sharing the same antenna.

73,  BIll


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Re: [Elecraft] [K3] Sub-receiver with one antenna jack

[Bill K9YEQ]

Ron,

I know so many on 75 meters SSB think they need to run receivers of any
brand with the Pre-amps on with no attenuation.  Probably they want to say
how strong everyone is?  I run generally with Pre off and attenuator on
160-40 meters SSB.

73,
Bill
K9YEQ


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron D'Eau Claire
Sent: Sunday, February 05, 2012 10:34 PM
To: 'Bill Conkling'; 'John Harper'; 'Elecraft'
Subject: Re: [Elecraft] [K3] Sub-receiver with one antenna jack

And I'd expect NO penalty for sharing the same antenna except, perhaps, on 6
meters. The K3's noise figure is already quite low. Indeed, watching the
e-mails posted here, it seems that a lot of K3 owners fail to turn on the
attenuator on the lower bands and some even run the pre-amp which degrades
the receiver performance even though it makes the bands sound louder. 

Ron AC7AC

-Original Message-
The subrec includes an aux antenna jack (BNC) so you will still have
possibility of two antennas.  There is also the REC antenna on the KX3Va
module (if installed).

...bill  nr4c.

-Original Message-
From: John Harper [mailto:j...@ae5x.com]
Sent: Sunday, February 05, 2012 10:31 PM
To: Elecraft
Subject: [Elecraft] [K3] Sub-receiver with one antenna jack

I have a fairly bare-bones K3, ie no provision for a 2nd antenna and no ATU
installed.

If I install the sub-rx, what is the penalty in terms of MDS due to the fact
that both the main and sub rx will share the same antenna?

Thanks/73,

John AE5X
http://www.ae5x.com/blog

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Re: [Elecraft] [K3] Sub-receiver with one antenna jack

[Bill Conkling]

The subrec includes an aux antenna jack (BNC) so you will still have
possibility of two antennas.  There is also the REC antenna on the KX3Va
module (if installed).

...bill  nr4c.

-Original Message-
From: John Harper [mailto:j...@ae5x.com] 
Sent: Sunday, February 05, 2012 10:31 PM
To: Elecraft
Subject: [Elecraft] [K3] Sub-receiver with one antenna jack

I have a fairly bare-bones K3, ie no provision for a 2nd antenna and no ATU
installed.

If I install the sub-rx, what is the penalty in terms of MDS due to the fact
that both 
the main and sub rx will share the same antenna?

Thanks/73,

John AE5X
http://www.ae5x.com/blog

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Re: [Elecraft] [K3] Sub-receiver with one antenna jack

[Ron D'Eau Claire]

And I'd expect NO penalty for sharing the same antenna except, perhaps, on 6
meters. The K3's noise figure is already quite low. Indeed, watching the
e-mails posted here, it seems that a lot of K3 owners fail to turn on the
attenuator on the lower bands and some even run the pre-amp which degrades
the receiver performance even though it makes the bands sound louder. 

Ron AC7AC

-Original Message-
The subrec includes an aux antenna jack (BNC) so you will still have
possibility of two antennas.  There is also the REC antenna on the KX3Va
module (if installed).

...bill  nr4c.

-Original Message-
From: John Harper [mailto:j...@ae5x.com] 
Sent: Sunday, February 05, 2012 10:31 PM
To: Elecraft
Subject: [Elecraft] [K3] Sub-receiver with one antenna jack

I have a fairly bare-bones K3, ie no provision for a 2nd antenna and no ATU
installed.

If I install the sub-rx, what is the penalty in terms of MDS due to the fact
that both 
the main and sub rx will share the same antenna?

Thanks/73,

John AE5X
http://www.ae5x.com/blog

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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Al Dynarski]

Thanks to all who responded both online and direct.  The order for the kit 
version will be sent out shortly.

And Arie, that is a great video!  Well done...

 

73

Al   W7SYK

 

Message: 15

Date: Sat, 06 Aug 2011 20:32:43 +0200

From: Arie Kleingeld PA3A p...@xs4all.nl

Subject: Re: [Elecraft] K3 sub receiver - kit vs assembled

To: elecraft@mailman.qth.net

Message-ID: 4e3d88cb.4090...@xs4all.nl

Content-Type: text/plain; charset=ISO-8859-1; format=flowed

 

Al,

 

Here's a video of the assembly of the K3 sub RX.

May this helps.

 

http://www.youtube.com/watch?v=5EJL8SlJ_L8

 

73

Arie PA3A

 

Al Dynarski wrote:

 I am getting ready to order the sub receiver for my K3 and have been 
 reviewing the on-line manuals.  I am still puzzled as to the

 difference between the kit and assembled versions.  I haven't found a manual 
 that shows any actual 'assembly' of the sub receiver

 just the installation of the unit into the K3.  Can someone please enlighten 
 me as to what I am missing?  Thanks!

 

 

 

 Al   W7SYK

 

 

 

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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Mike Fatchett W0MU]

If you were having Elecraft build your K3 or if you are sending your K3 
back then the assembly price needs to be included.  If you already have 
your K3 then order it without assembly.

The receiver is fully assembled.  You just need to install it.  It is no 
different than any other K3 module.

On 8/6/2011 9:25 AM, Al Dynarski wrote:
 I am getting ready to order the sub receiver for my K3 and have been 
 reviewing the on-line manuals.  I am still puzzled as to the
 difference between the kit and assembled versions.  I haven't found a manual 
 that shows any actual 'assembly' of the sub receiver
 just the installation of the unit into the K3.  Can someone please enlighten 
 me as to what I am missing?  Thanks!



 Al   W7SYK

 Bar Nunn, WY



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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Bill W4ZV]

Al Dynarski wrote:
 
 I am getting ready to order the sub receiver for my K3 and have been
 reviewing the on-line manuals.  I am still puzzled as to the
 difference between the kit and assembled versions.  I haven't found a
 manual that shows any actual 'assembly' of the sub receiver
 just the installation of the unit into the K3.  Can someone please
 enlighten me as to what I am missing?  
 

Maybe you didn't read far enough in the manual.  The following includes
assembly, operation and installation:

http://www.elecraft.com/manual/KRX3_Subreceiver_Install-Operate_Manual_Rev_E.pdf

The installation looks a little intimidating but it's really not so
bad...just pay careful attention to the cable routing diagrams and photos.

73,  Bill


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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Bill W4ZV]

Mike Fatchett wrote:
 
 The receiver is fully assembled.  You just need to install it.  It is no 
 different than any other K3 module.
 

This is not correct.  You get 5 different boards, the main board needs to be
mounted in the shielded enclosure, filters need to be mounted on the main
board and the other boards need to be installed, cables installed, etc. 
Refer to the manual link I just posted.

73,  Bill


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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Guy Olinger K2AV]

I could be wrong, but assembled I think means that you send your K3
back to Elecraft and they install it for you.  There was no assembly
OF the K3 per se, other than putting it's parts in the K3.

You can see the assembly steps easily enough in the downloadable docs
from the website.

73, Guy.

On Sat, Aug 6, 2011 at 11:25 AM, Al Dynarski adynar...@casperkoa.com wrote:
 I am getting ready to order the sub receiver for my K3 and have been 
 reviewing the on-line manuals.  I am still puzzled as to the
 difference between the kit and assembled versions.  I haven't found a manual 
 that shows any actual 'assembly' of the sub receiver
 just the installation of the unit into the K3.  Can someone please enlighten 
 me as to what I am missing?  Thanks!



 Al   W7SYK

 Bar Nunn, WY



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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Arie Kleingeld PA3A]

Al,

Here's a video of the assembly of the K3 sub RX.
May this helps.

http://www.youtube.com/watch?v=5EJL8SlJ_L8

73
Arie PA3A


Al Dynarski wrote:
 I am getting ready to order the sub receiver for my K3 and have been 
 reviewing the on-line manuals.  I am still puzzled as to the
 difference between the kit and assembled versions.  I haven't found a manual 
 that shows any actual 'assembly' of the sub receiver
 just the installation of the unit into the K3.  Can someone please enlighten 
 me as to what I am missing?  Thanks!



 Al   W7SYK

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Re: [Elecraft] K3 sub receiver - kit vs assembled

[Ron D'Eau Claire]

Excellent video Arie! 

Dank je wel

Ron AC7AC

-Original Message-
Al,

Here's a video of the assembly of the K3 sub RX.
May this helps.

http://www.youtube.com/watch?v=5EJL8SlJ_L8

73
Arie PA3A


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Re: [Elecraft] k3 sub receiver ant selsction

[iz0fyl]

thanks
now it's quite clear.
so if I select ant=nbc the sub ant in main path is the same ant of the main
rx (one ant for both rxs)? rigth?
best 73
luca
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Re: [Elecraft] k3 sub receiver ant selsction

[Don Wilhelm]

  Luca,

Yes, it is possible to hear the subRX on the opposite antenna that the 
main is listening to.

You must have a TMP cable connected between the KAT3 and the antenna 
input of the subRX - that cable is not installed on factory-built K3s, 
but the extra TMP cable is shipped with the K3.

The antenna that is NOT connected to the Main RX will be heard when the 
AUX ANT is selected for the SubRX.

If the two antennas are not well separated, you may hear the COR in the 
sub being activated during transmit (clicking noise during transmit).

See Figure 4 on page 43 of the manual.

73,
Don W3FPR

On 12/18/2010 11:46 AM, iz0fyl wrote:
 Hi folks
 just a question.
 I' don'nt understand the selection scheme of the sub rx.
 In the figures of the manual seems that is possible in the aux rreceive
 using ant1 on main ant ant 2 on sub.
 the question is: isit possibile to reiceive on main rx the anti1 signal and
 anthe sub rx the antenna 2 signal?
 I tried on my k3 but I hear the ant1 in both the receivers
 thanks
 luca
 73 de iz0fyl
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Re: [Elecraft] k3 sub receiver ant selsction

[Cady, Fred]

Hi Luca,
Here is a picture showing what you want to do.
http://www.ke7x.com/home/guide-to-the-k3/main-and-sub-rx-antenna-switchi
ng
It shows the Main Rx connected to ANT1 and the Sub Rx connected to ANT2.
You must have Config:KRX3 Ant=ATU. Then turn Sub On (tap SUB) and then
either RX ANT or Hold BSET and then tap ANT.
When you have this configuration you can switch the antennas back and
forth by tapping ANT.

Fred Cady
fcady at ieee dot org  

 -Original Message-
 From: elecraft-boun...@mailman.qth.net 
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of iz0fyl
 Sent: Saturday, December 18, 2010 9:47 AM
 To: elecraft@mailman.qth.net
 Subject: [Elecraft] k3 sub receiver ant selsction
 
 
 Hi folks
 just a question.
 I' don'nt understand the selection scheme of the sub rx.
 In the figures of the manual seems that is possible in the 
 aux rreceive
 using ant1 on main ant ant 2 on sub.
 the question is: isit possibile to reiceive on main rx the 
 anti1 signal and
 anthe sub rx the antenna 2 signal?
 I tried on my k3 but I hear the ant1 in both the receivers
 thanks
 luca
 73 de iz0fyl
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Re: [Elecraft] K3 Sub Receiver Antenna

[Brett Howard]

I'm not so sure that a BPF would solve the problem even if they are on
different bands as the COR may still trip even though the subRX is on
another band...

~Brett (N7MG)

On Mon, Sep 27, 2010 at 11:38 AM, Don Wilhelm w3...@embarqmail.com wrote:
  Bill,

 My answer is not a smart remark, but rather the truth - and that
 answer is Whatever it takes!
 There are so many variables that your question cannot be answered
 specifically for your location.
 Some of the variables are antenna polarization, physical distance, gain
 of the transmit antenna and its heading relative to the receive
 antenna.  Trees, buildings and other objects that may shield the receive
 antenna from the transmit ant, proximity of feedlines, how much
 radiation is coming back on the feedline for each antenna, plus probably
 a host of other factors that I may not have thought of.

 You could make some tests using a simple pickup antenna and a field
 strength meter at your proposed location for the receiving antenna
 before placing it.  Position the temporary pickup antenna for the least
 field strength.
 Unless you have a lot of freedom in the physical location of the receive
 antenna, the simple solution may be to switch in an attenuator for the
 subRX when transmitting.  If the main and the sub are going to be on
 different bands, perhaps a bandpass filter would be a good solution -
 again, the real answer is Whatever it takes, and hopefully you can
 begin to understand why that is the only answer possible.

 73,
 Don W3FPR

 On 9/27/2010 12:59 PM, Bill N3KKM wrote:
 The K3 manual indicates that the Sub Receiver's AUX antenna must be 
 well-isolated from the transmit antenna to avoid activating the sub's 
 carrier carrier-operated relay. From a practical, real world standpoint, 
 what is well isolated?

 Bill - N3KKM

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Re: [Elecraft] K3 Sub Receiver Antenna

[Julius Fazekas n2wn]

Bill,

Just an operating example, I have a short (well had) 330' beverage within 20
feet of my TX antenna for 160m. I have never had an issue with the relay
tripping. I run LP or QRP, it may be an issue running HP, but I haven't
heard any complaints from any of my friends on the Top Band.

I don't use a relay like David does, but probably will in the future to
detune my TX antenna. Not because of the second RX relay, but to minimize RX
antenna pattern distortion.

Probably the best thing is to use isolation transformers and current chokes,
if in doubt or just to be safe. Those are relatively easy to implement.
David's option is a bit more complex, but may be necessary in certain
circumstances.

The easiest thing to do is try it with your current setup, if it doesn't
trip, then most likely you're well enough isolated for that particular
issue.

73,
Julius
n2wn



-
Julius Fazekas
N2WN

Tennessee Contest Group
http://www.k4ro.net/tcg/index.html

Tennessee QSO Party
http://www.tnqp.org/

Elecraft K2/100 #4455
Elecraft K3/100 #366
Elecraft K3#1875
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