[Elecraft] Rx Antenna...

[Dave G.]

The way I read the manual description and diagrams is:-
If you want to use a separate RX antenna *without* the KAT3 and *without* 
the sub-Rx then you *must* have the KXV3...
Please correct me if I am wrong... this is of great interest to me
--
Dave G.   KK7SS
'65 MK III Sprite in Richland, WA
"Two things are infinite, the universe and human stupidity.
But I'm not so sure about the universe."  ... Albert Einstein.

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[Elecraft] Rx Antenna...

[Barry N1EU]

KK7SS asked: "The way I read the manual description and diagrams is:-
If you want to use a separate RX antenna *without* the KAT3 and *without*
the sub-Rx then you *must* have the KXV3...
Please correct me if I am wrong... this is of great interest to me"

If you want to use a separate RX antenna with the main receiver, you
need the KXV3.  It doesn't matter whether or not the KAT3 is
installed.

73,
Barry N1EU
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[Elecraft] RX antenna

[Ian Westerland]

Hi!  My K3 arrived last Wednesday and has since been set up and is 
now in use.  It is a great transceiver I am enjoying getting to kno.


I am using a Hampod to provide access via voice output and am 
wondering about the RX antenna button on the K3 front pannel.  When I 
turn the RX antenna off and on, the Ham Pod announces "Pre-amp." When 
I press the Pre-amp button the Ham Pod annunces "Pre-amp enabled/ 
disabled" depending on which press of the button is active.


Is the Pre-amp announcement on the RX antenna button what you see on 
the screen?  I would have thought that the button for the RX antenna 
would be announced as the Rx antenna off/on.
By trying  out the transceiver I was able to interpret ok so am not 
having any problems.


Thanks in anticipation of an answer/explanation.

73


Ian Westerland,  VK3vin

  


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Re: [Elecraft] Rx Antenna...

[Ken Wagner]

That's the way I see it.
73, Ken K3IU

Dave G. wrote:

The way I read the manual description and diagrams is:-
If you want to use a separate RX antenna *without* the KAT3 and *without* 
the sub-Rx then you *must* have the KXV3...

Please correct me if I am wrong... this is of great interest to me
--
Dave G.   KK7SS
'65 MK III Sprite in Richland, WA
"Two things are infinite, the universe and human stupidity.
But I'm not so sure about the universe."  ... Albert Einstein.

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[Elecraft] RX antenna (K3)

[Adriano Perazio]

Hello i´m considering a rx antenna for the K3. As i do not have space
for big systems like beverage, etc, i´m thinking about this one from DX
Eng.: 
 

http://www.dxengineering.com/Parts.asp?ID=2190&PLID=220&SecID=79&DeptID=
12&PartNo=DXE-ARAV3-1PE
Wich is a vertical one and i have space to put up 2 of them if needed.
What you guys think? It´s not a very free space and i have 90ft from my
TX antennas (lowest is 80m band).
I´m expecting less noise on the lower bands, and try the diversity rx on
K3.
What you guys think ?
 
Tnx in advance.
 
PY2ADR - Adriano
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Re: [Elecraft] RX antenna

[Vic Rosenthal]

The preamp is on or off per-band and per-antenna. So for example you could have 
it on with the rx antenna and off with antenna 1 and on for antenna 2 on a 
given band. Possibly when you turn the rx antenna on or off you are also 
changing the state of the preamp, and that is what the ham pod is announcing.
In this situation, you would see both rx and pre appear on the screen if both 
were on.

Vic 4X6GP/K2VCO 

> On Mar 22, 2015, at 4:53 AM, Ian Westerland  wrote:
> 
> Hi!  My K3 arrived last Wednesday and has since been set up and is now in 
> use.  It is a great transceiver I am enjoying getting to kno.
> 
> I am using a Hampod to provide access via voice output and am wondering about 
> the RX antenna button on the K3 front pannel.  When I turn the RX antenna off 
> and on, the Ham Pod announces "Pre-amp." When I press the Pre-amp button the 
> Ham Pod annunces "Pre-amp enabled/ disabled" depending on which press of the 
> button is active.
> 
> Is the Pre-amp announcement on the RX antenna button what you see on the 
> screen?  I would have thought that the button for the RX antenna would be 
> announced as the Rx antenna off/on.
> By trying  out the transceiver I was able to interpret ok so am not having 
> any problems.
> 
> Thanks in anticipation of an answer/explanation.
> 
> 73
> 
> 
> Ian Westerland,  VK3vin
> 
>  
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Re: [Elecraft] RX antenna

[Rich]

It may be because if you turn the preamp on while the rx ant is on. Then 
the preamp will turn ON/OFF when you toogle the RX ant ON/OFF.   I hope 
that is clearer than mud.


Rich

On 3/21/2015 10:53 PM, Ian Westerland wrote:
Hi!  My K3 arrived last Wednesday and has since been set up and is now 
in use.  It is a great transceiver I am enjoying getting to kno.


I am using a Hampod to provide access via voice output and am 
wondering about the RX antenna button on the K3 front pannel. When I 
turn the RX antenna off and on, the Ham Pod announces "Pre-amp." When 
I press the Pre-amp button the Ham Pod annunces "Pre-amp enabled/ 
disabled" depending on which press of the button is active.


Is the Pre-amp announcement on the RX antenna button what you see on 
the screen?  I would have thought that the button for the RX antenna 
would be announced as the Rx antenna off/on.
By trying  out the transceiver I was able to interpret ok so am not 
having any problems.


Thanks in anticipation of an answer/explanation.

73


Ian Westerland,  VK3vin


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[Elecraft] RX antenna protection

[W1PEF]

I am considering a Rx antenna but my property is small and concerned about 
strong signals over powering the receiver. Does the K3S have built-in 
protection?
Does anyone use a loop receive antenna or BOG antenna ... would like some 
recommendations from actual users of receive antennas.
Have the complete K-Line and would like to improve my ability to hear. 
Thanks for any advice...
Paul
W1PEF



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[Elecraft] Rx antenna protection

[Phillip Zminda]

Paul,

I have used a BOG, a Pixel Loop and a Wellbrook loop receiving antennas. The 
BOG was ok but signal levels were very low and it needed a preamp. The BOG 
needs a lot of tweaking and good grounds at both ends. K1FZ is the expert on 
BOGs and can provide a wealth of information as well as custom transformers. I 
used it one winter but didn’t want to leave in the yard when mowing season 
started. The Pixel loop worked fairly well but I sold it and got a Wellbrook 
ALA 1530, which I think has a cleaner design. The Wellbrook works quite well at 
reducing the noise level. The signal levels are lower but with much reduced 
noise. My loop rotor died and it’s in a fixed position but at about a 6 ft. 
height it doesn’t seem highly directional. I think the Wellbrook is still 
cheaper than the Pixel. Andrew Ikin at Wellbrook is very helpful in answering 
any questions about loop applications 

My receive antenna is far enough from the transmit antenna that I have never 
had any issues with the COR activating, even at 500 watts.

Good luck with your choice.

Phil 
N3ZP
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Re: [Elecraft] RX antenna (K3)

[Craig D. Smith]

DX Eng makes good stuff, Adriano, and I would think this to be a good
vertical active whip.  You might want to also check out the active whip from
Clifton Labs.  It is also a high quality unit with good overload
characteristics and ability to automatically turn off during Xmit periods.
Available as a kit and much less expensive than the DX Eng, even with the
coax DC coupling unit.  I have one 50 ft away from my xmit antennas at 100 W
and have no problem. 
Another possibility you might want to explore is a K9AY loop array, even if
not full size.  This will give you the advantages of less RX noise than an
active whip and significant selectable directionality on the low bands.  I
use one of these also and prefer it to the whip on 160 thru 30.  They are
commercially available, but can also be easily homebrewed.  I use a
homebrewed downsized K9AY and the active whip together as a diversity RX
system with the K3.
73   Craig  AC0DS



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Re: [Elecraft] RX antenna (K3)

[GREG FICHER]

The DXE NCC1 is also a nice unit that gives the ability to adust the phase
between two rx antennas.  I use one with two of the clifton labs active
antennas and also installed two of Jack's new HP filters in the NCC1 (It has
provisions for filters but DXE decided not to build the filters).

73
Greg
AB7R



On Tue, Jan 11, 2011 at 7:21 AM, Craig D. Smith wrote:

> DX Eng makes good stuff, Adriano, and I would think this to be a good
> vertical active whip.  You might want to also check out the active whip
> from
> Clifton Labs.  It is also a high quality unit with good overload
> characteristics and ability to automatically turn off during Xmit periods.
> Available as a kit and much less expensive than the DX Eng, even with the
> coax DC coupling unit.  I have one 50 ft away from my xmit antennas at 100
> W
> and have no problem.
> Another possibility you might want to explore is a K9AY loop array, even if
> not full size.  This will give you the advantages of less RX noise than an
> active whip and significant selectable directionality on the low bands.  I
> use one of these also and prefer it to the whip on 160 thru 30.  They are
> commercially available, but can also be easily homebrewed.  I use a
> homebrewed downsized K9AY and the active whip together as a diversity RX
> system with the K3.
> 73   Craig  AC0DS
>
>
>
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Re: [Elecraft] RX antenna (K3)

[David Cutter]

Craig

I'm most interested in your system and I wonder if you could describe it 
further.   What size is your loop and do you use a separate phasing unit 
before injecting the result into the K3 rx input?

David
G3UNA

> Another possibility you might want to explore is a K9AY loop array, even 
> if
> not full size.  This will give you the advantages of less RX noise than an
> active whip and significant selectable directionality on the low bands.  I
> use one of these also and prefer it to the whip on 160 thru 30.  They are
> commercially available, but can also be easily homebrewed.  I use a
> homebrewed downsized K9AY and the active whip together as a diversity RX
> system with the K3.
> 73   Craig  AC0DS
> 
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[Elecraft] Rx antenna on K3

[Dick Allardyce (N4RA)]

I've had my K3 since June and everything seems to be working OK.  I just 
recently tried an RX antenna (beverage), but it doesn't work.  I've tried 
several antennas in the RX-in port, but no signal.  I've reviewed the manual 
and CONFIG parameters, but no cigar.  I initially hooked it onto the 6m preamp, 
but I removed the pre-amp to eliminate if from the equation.  Any 
recommendations?  I feel I'm missing something.

Regards,
Dick N4RA


Dick Allardyce
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Re: [Elecraft] RX antenna protection

[Drew AF2Z]

Same situation here: small space and would like to try some low noise 
receive antennas. I recently bought an Array Solutions AS-RXFEP rf 
limiter to use on the RX Ant port of my K3. Haven't tried it yet but 
looks like it will do the job.



73,
Drew
AF2Z



On 08/14/17 21:48, W1PEF wrote:

I am considering a Rx antenna but my property is small and concerned about 
strong signals over powering the receiver. Does the K3S have built-in 
protection?
Does anyone use a loop receive antenna or BOG antenna ... would like some 
recommendations from actual users of receive antennas.
Have the complete K-Line and would like to improve my ability to hear.
Thanks for any advice...
Paul
W1PEF





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Re: [Elecraft] RX antenna protection

[Chuck Milam, N9KY]

Also, check out the DX Engineering Receiver Guard Electronic RF Limiters:


https://www.dxengineering.com/search/part-type/hf-receive-antenna-system-devices/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autoview=SKU&sortby=Default&sortorder=Ascending

---
Chuck Milam, N9KY
n...@arrl.net

On Mon, Aug 14, 2017 at 11:07 PM, Drew AF2Z  wrote:

> Same situation here: small space and would like to try some low noise
> receive antennas. I recently bought an Array Solutions AS-RXFEP rf limiter
> to use on the RX Ant port of my K3. Haven't tried it yet but looks like it
> will do the job.
>
>
> 73,
> Drew
> AF2Z
>
>
>
>
> On 08/14/17 21:48, W1PEF wrote:
>
>> I am considering a Rx antenna but my property is small and concerned
>> about strong signals over powering the receiver. Does the K3S have built-in
>> protection?
>> Does anyone use a loop receive antenna or BOG antenna ... would like some
>> recommendations from actual users of receive antennas.
>> Have the complete K-Line and would like to improve my ability to hear.
>> Thanks for any advice...
>> Paul
>> W1PEF
>>
>>
>>
>>
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Re: [Elecraft] RX antenna protection

[Mark E. Musick]

Paul,
I use several different receive antennas and use all the ones I am going to
suggest.
For your small lot, you didn't say how small, I would look at the Pixel
loop, K9AY and RBOG.
I have used these and they work. You can get all three from DX Engineering.
>From ARRAY Solutions there is the Shared Apex Loop. It will take up about
the same space as a K9AY. I have not used one of these so can't say
personally how well it works, but people I know that have used them speak
highly of this antenna.
You have gotten two good suggestions for front end protection. I use the DX
Engineering receiver guard model RG-5000. You don't need the RG-5000HD
unless you're in a contest environment. 
Keep us posted on your progress.

73,
Mark, WB9CIF

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chuck Milam, N9KY
Sent: Tuesday, August 15, 2017 1:16 PM
To: Elecraft Mail List 
Subject: Re: [Elecraft] RX antenna protection

Also, check out the DX Engineering Receiver Guard Electronic RF Limiters:


https://www.dxengineering.com/search/part-type/hf-receive-antenna-system-dev
ices/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autov
iew=SKU&sortby=Default&sortorder=Ascending

---
Chuck Milam, N9KY
n...@arrl.net

On Mon, Aug 14, 2017 at 11:07 PM, Drew AF2Z  wrote:

> Same situation here: small space and would like to try some low noise 
> receive antennas. I recently bought an Array Solutions AS-RXFEP rf 
> limiter to use on the RX Ant port of my K3. Haven't tried it yet but 
> looks like it will do the job.
>
>
> 73,
> Drew
> AF2Z
>
>
>
>
> On 08/14/17 21:48, W1PEF wrote:
>
>> I am considering a Rx antenna but my property is small and concerned 
>> about strong signals over powering the receiver. Does the K3S have 
>> built-in protection?
>> Does anyone use a loop receive antenna or BOG antenna ... would like 
>> some recommendations from actual users of receive antennas.
>> Have the complete K-Line and would like to improve my ability to hear.
>> Thanks for any advice...
>> Paul
>> W1PEF
>>
>>
>>
>>
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Re: [Elecraft] RX antenna protection

[j...@kk9a.com]

Great question! I asked the same thing once and never got an answer so to
be safe I either short the RX antenna during transmit or if SO2R I use DXE
receiver guards. It would be nice if the K3S had a similar built in
protector.

John KK9A

W1PEF wrote
Mon Aug 14 21:48:29 EDT 2017

I am considering a Rx antenna but my property is small and concerned about
strong signals over powering the receiver. Does the K3S have built-in
protection?
Does anyone use a loop receive antenna or BOG antenna ... would like some
recommendations from actual users of receive antennas.
Have the complete K-Line and would like to improve my ability to hear.
Thanks for any advice...
Paul
W1PEF


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Re: [Elecraft] RX antenna protection

[Don Wilhelm]

John,

The K3S does have protection on the RX ANT input.  It is in the form of 
a COR (carrier operated relay) that will close in the presence of a high 
RF Field.
While that protects the K3S, the relay clacking can be bothersome, so if 
you do hear that relay clacking, you may want to consider some form of 
external protection.


73,
Don W3FPR

On 8/15/2017 10:50 AM, j...@kk9a.com wrote:

Great question! I asked the same thing once and never got an answer so to
be safe I either short the RX antenna during transmit or if SO2R I use DXE
receiver guards. It would be nice if the K3S had a similar built in
protector.

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Re: [Elecraft] RX antenna protection

[Ignacy]

If a receive antenna has a preamp, there no need to do any antenna guard
since the preamp cannot destroy K3. 

I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit
antennas. None was turned off during transmit.  Both have preamps and
nothing was damaged despite running a  KW. Of all 3, K7TJR was the best by
far. 

BTW, the RX ANT input in K3 is protected by a RF activated relay.  

Ignacy, NO9E



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Re: [Elecraft] RX antenna protection

[Bob McGraw K4TAX]

See page 63 of the manual.  Also page 70 under Receive."*HI RFI* 
warning:"


RFI DET - *NOR *enables detection of high RFI at the antenna in receive 
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable 
the warning.


73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, j...@kk9a.com wrote:

Great question! I asked the same thing once and never got an answer so to
be safe I either short the RX antenna during transmit or if SO2R I use DXE
receiver guards. It would be nice if the K3S had a similar built in
protector.

John KK9A

W1PEF wrote
Mon Aug 14 21:48:29 EDT 2017

I am considering a Rx antenna but my property is small and concerned about
strong signals over powering the receiver. Does the K3S have built-in
protection?
Does anyone use a loop receive antenna or BOG antenna ... would like some
recommendations from actual users of receive antennas.
Have the complete K-Line and would like to improve my ability to hear.
Thanks for any advice...
Paul
W1PEF


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Re: [Elecraft] RX antenna protection

[Richard Fjeld]

I haven’t been following this, and just noticed it, so I hope I am in sync with 
this.

Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I 
think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as 
transmit was detected.  It allowed full break-in for CW work.  I would like to 
see something like this again today in solid state.  I think this would be the 
ticket for what you need. I haven’t looked, so I don’t know if anyone is 
marketing such a device.

Rich, n0ce

From: Bob McGraw K4TAX<mailto:rmcg...@blomand.net>
Sent: Tuesday, August 15, 2017 11:00 AM
To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] RX antenna protection

See page 63 of the manual.  Also page 70 under Receive."*HI RFI*
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, j...@kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A
>
> W1PEF wrote
> Mon Aug 14 21:48:29 EDT 2017
>
> I am considering a Rx antenna but my property is small and concerned about
> strong signals over powering the receiver. Does the K3S have built-in
> protection?
> Does anyone use a loop receive antenna or BOG antenna ... would like some
> recommendations from actual users of receive antennas.
> Have the complete K-Line and would like to improve my ability to hear.
> Thanks for any advice...
> Paul
> W1PEF
>
>
> __
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Re: [Elecraft] RX antenna protection

[Richard Fjeld]

I just read Ignacy’s post telling that the K3 receive ant input has a RF 
activated relay.  I’m glad to see that.

Rich, n0ce


From: Richard Fjeld<mailto:rpfj...@outlook.com>
Sent: Tuesday, August 15, 2017 12:00 PM
To: Bob McGraw K4TAX<mailto:rmcg...@blomand.net>; 
elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] RX antenna protection

I haven’t been following this, and just noticed it, so I hope I am in sync with 
this.

Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I 
think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as 
transmit was detected.  It allowed full break-in for CW work.  I would like to 
see something like this again today in solid state.  I think this would be the 
ticket for what you need. I haven’t looked, so I don’t know if anyone is 
marketing such a device.

Rich, n0ce

From: Bob McGraw K4TAX<mailto:rmcg...@blomand.net>
Sent: Tuesday, August 15, 2017 11:00 AM
To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] RX antenna protection

See page 63 of the manual.  Also page 70 under Receive."*HI RFI*
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, j...@kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A
>
> W1PEF wrote
> Mon Aug 14 21:48:29 EDT 2017
>
> I am considering a Rx antenna but my property is small and concerned about
> strong signals over powering the receiver. Does the K3S have built-in
> protection?
> Does anyone use a loop receive antenna or BOG antenna ... would like some
> recommendations from actual users of receive antennas.
> Have the complete K-Line and would like to improve my ability to hear.
> Thanks for any advice...
> Paul
> W1PEF
>
>
> __
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Re: [Elecraft] RX antenna protection

[John K9UWA]

We have been operating this way with full break-in for many years using the 
KD9SV products. First it was just the "Front End Saver" which removes and 
grounds the incoming rcv antenna from your radio during transmit. As a "Fail 
Safe" the device also prevents the Amplifier from working by removing the 
PTT line to the amp if by any chance the relays in the KD9SV device fail to 
operate. Later it is now incorporated into the various RBOG and other 
Pre-Amp devices that KD9SV sells... through DX-Engineering. 

Disclaimer Statement: Yes I am a friend of Gary's. Call me a more than 
happy customer. I complained many years ago after I fried the front end of 
my IC-765 radios a couple times and Gary started building these devices. 
They Work and I am happy. No more blown front ends no more blown 
pre-amps.

John k9uwa

> Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I
> think it was called) that had one or two tubes in it. It worked perfectly to
> bias the receive completely and immediately as soon as transmit was detected. 
> It allowed full break-in for CW work.  I would like to see something like this
> again today in solid state.  I think this would be the ticket for what you 
> need.
> I havenTMt looked, so I donTMt know if anyone is marketing such a device.
> 
> Rich, n0ce

John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
k9...@arrl.net
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-637-6426

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Re: [Elecraft] RX antenna protection

[a45wg]

John,
Very sound advice.

I am using a Alpha Delta T33g50 that I picked up at HRO Denver, Co; The 
Red Pittaya antenna (Cobwebb) is 15 feet below the TH-7 which is emitting aprox 
500W. 

It has survived for 12 months so far, which has amazed me.

Regards

Tim, A45WG



> On Aug 15, 2017, at 10:06 PM, John K9UWA  
> wrote:
> 
> We have been operating this way with full break-in for many years using the 
> KD9SV products. First it was just the "Front End Saver" which removes and 
> grounds the incoming rcv antenna from your radio during transmit. As a "Fail 
> Safe" the device also prevents the Amplifier from working by removing the 
> PTT line to the amp if by any chance the relays in the KD9SV device fail to 
> operate. Later it is now incorporated into the various RBOG and other 
> Pre-Amp devices that KD9SV sells... through DX-Engineering. 
> 
> Disclaimer Statement: Yes I am a friend of Gary's. Call me a more than 
> happy customer. I complained many years ago after I fried the front end of 
> my IC-765 radios a couple times and Gary started building these devices. 
> They Work and I am happy. No more blown front ends no more blown 
> pre-amps.
> 
> John k9uwa
> 
>> Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I
>> think it was called) that had one or two tubes in it. It worked perfectly to
>> bias the receive completely and immediately as soon as transmit was 
>> detected. 
>> It allowed full break-in for CW work.  I would like to see something like 
>> this
>> again today in solid state.  I think this would be the ticket for what you 
>> need.
>> I havenTMt looked, so I donTMt know if anyone is marketing such a device.
>> 
>> Rich, n0ce
> 
> John Goller, K9UWA & Jean Goller, N9PXF 
> Antique Radio Restorations
> k9...@arrl.net
> Visit our Web Site at:
> http://www.JohnJeanAntiqueRadio.com
> 4836 Ranch Road
> Leo, IN 46765
> USA
> 1-260-637-6426
> 
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Re: [Elecraft] RX antenna protection

[Vic Rosenthal]

I'm using a Pixel Loop. Advantages are that it is small, can be rotated to null 
a noise source, and works on all HF bands. It is vertically polarized, so if 
you have a horizontal antenna you can get a useful diversity effect without too 
much physical separation. It has a built in relay that disconnects it to 
protect your receiver while transmitting. I use diversity almost all the time, 
and it definitely improves copy of CW signals.

Vic 4X6GP 

> On 15 Aug 2017, at 17:01, Mark E. Musick  wrote:
> 
> Paul,
> I use several different receive antennas and use all the ones I am going to
> suggest.
> For your small lot, you didn't say how small, I would look at the Pixel
> loop, K9AY and RBOG.
> I have used these and they work. You can get all three from DX Engineering.
> From ARRAY Solutions there is the Shared Apex Loop. It will take up about
> the same space as a K9AY. I have not used one of these so can't say
> personally how well it works, but people I know that have used them speak
> highly of this antenna.
> You have gotten two good suggestions for front end protection. I use the DX
> Engineering receiver guard model RG-5000. You don't need the RG-5000HD
> unless you're in a contest environment. 
> Keep us posted on your progress.
> 
> 73,
> Mark, WB9CIF
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chuck Milam, N9KY
> Sent: Tuesday, August 15, 2017 1:16 PM
> To: Elecraft Mail List 
> Subject: Re: [Elecraft] RX antenna protection
> 
> Also, check out the DX Engineering Receiver Guard Electronic RF Limiters:
> 
> 
> https://www.dxengineering.com/search/part-type/hf-receive-antenna-system-dev
> ices/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autov
> iew=SKU&sortby=Default&sortorder=Ascending
> 
> ---
> Chuck Milam, N9KY
> n...@arrl.net
> 
>> On Mon, Aug 14, 2017 at 11:07 PM, Drew AF2Z  wrote:
>> 
>> Same situation here: small space and would like to try some low noise 
>> receive antennas. I recently bought an Array Solutions AS-RXFEP rf 
>> limiter to use on the RX Ant port of my K3. Haven't tried it yet but 
>> looks like it will do the job.
>> 
>> 
>> 73,
>> Drew
>> AF2Z
>> 
>> 
>> 
>> 
>>> On 08/14/17 21:48, W1PEF wrote:
>>> 
>>> I am considering a Rx antenna but my property is small and concerned 
>>> about strong signals over powering the receiver. Does the K3S have 
>>> built-in protection?
>>> Does anyone use a loop receive antenna or BOG antenna ... would like 
>>> some recommendations from actual users of receive antennas.
>>> Have the complete K-Line and would like to improve my ability to hear.
>>> Thanks for any advice...
>>> Paul
>>> W1PEF
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Re: [Elecraft] RX antenna protection

[Vic Rosenthal]

I disagree. A good preamp like the DXE preamps can handle large signals and 
still be linear. That means they can output a lot of power. Do not assume you 
are safe if there is a preamp unless it is a lousy one!

Vic 4X6GP 

> On 15 Aug 2017, at 18:07, Ignacy  wrote:
> 
> If a receive antenna has a preamp, there no need to do any antenna guard
> since the preamp cannot destroy K3. 
> 
> I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit
> antennas. None was turned off during transmit.  Both have preamps and
> nothing was damaged despite running a  KW. Of all 3, K7TJR was the best by
> far. 
> 
> BTW, the RX ANT input in K3 is protected by a RF activated relay.  
> 
> Ignacy, NO9E
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Re: [Elecraft] RX antenna protection

[KENT TRIMBLE]

The Johnson 250-39 and B&W 380 T/R switches both had a certain amount of 
"suck-out" but they did protect tube receivers.


I had both (still do) and preferred the Johnson.

http://wireless-girl.com/Projects/TRswitches/Johnson/

Note the warning about use with solid-state equipment, however.

73,

Kent  K9ZTV



On 8/15/2017 11:58 AM, someone wrote:

Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I 
think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as 
transmit was detected.  It allowed full break-in for CW work.  I would like to 
see something like this again today in solid state.  I think this would be the 
ticket for what you need. I haven’t looked, so I don’t know if anyone is 
marketing such a device.




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Re: [Elecraft] RX antenna protection

[Dave Sublette]

I had one once.  It was a tremendous TVI generator….  

K4TO
> On Aug 15, 2017, at 4:07 PM, KENT TRIMBLE  wrote:
> 
> The Johnson 250-39 and B&W 380 T/R switches both had a certain amount of 
> "suck-out" but they did protect tube receivers.
> 
> I had both (still do) and preferred the Johnson.
> 
> http://wireless-girl.com/Projects/TRswitches/Johnson/
> 
> Note the warning about use with solid-state equipment, however.
> 
> 73,
> 
> Kent  K9ZTV
> 
> 
> 
> On 8/15/2017 11:58 AM, someone wrote:
>> Just a note to say that years ago, I had a B&W Electronic Antenna Switch (I 
>> think it was called) that had one or two tubes in it.
>> It worked perfectly to bias the receive completely and immediately as soon 
>> as transmit was detected.  It allowed full break-in for CW work.  I would 
>> like to see something like this again today in solid state.  I think this 
>> would be the ticket for what you need. I haven’t looked, so I don’t know if 
>> anyone is marketing such a device.
>> 
>> 
> 
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Re: [Elecraft] RX antenna protection

[Ignacy Misztal]

This is my experience. Making a large-signal preamp is usually a waste of
power since it is a mixer that is a limiting factor.
I can believe that a device from DX Engineering can be poorly designed.
Have NCC-2.  Weighs like a tank but fragile like a baby.
Ignacy, NO9E

On Tue, Aug 15, 2017 at 3:59 PM, Vic Rosenthal  wrote:

> I disagree. A good preamp like the DXE preamps can handle large signals
> and still be linear. That means they can output a lot of power. Do not
> assume you are safe if there is a preamp unless it is a lousy one!
>
> Vic 4X6GP
>
> > On 15 Aug 2017, at 18:07, Ignacy  wrote:
> >
> > If a receive antenna has a preamp, there no need to do any antenna guard
> > since the preamp cannot destroy K3.
> >
> > I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit
> > antennas. None was turned off during transmit.  Both have preamps and
> > nothing was damaged despite running a  KW. Of all 3, K7TJR was the best
> by
> > far.
> >
> > BTW, the RX ANT input in K3 is protected by a RF activated relay.
> >
> > Ignacy, NO9E
>
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Re: [Elecraft] RX antenna protection

[john]

I am aware of the RFI warning however to me there is a huge difference
between detecting RFI and protecting the expensive transceiver from RF
damage.  Apparently the K3S does both.

John KK9A

Bob McGraw K4TAX wrote: 
Tue Aug 15 11:59:04 EDT 2017

See page 63 of the manual.  Also page 70 under Receive."*HI RFI* 
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive 
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable 
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, john at kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A

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Re: [Elecraft] Rx antenna protection

[Ken Chandler]

DXE ARAV3-1P - DXE RG 5000HD.

I've ordered a DXE ARAVS-1P Receive antenna, and DXE RG 5000HD front end 
protector from USA,
I'm building a CW skimmer project in a small ...ish back yard with close by 
transmitting antennas etc, my investment should ! Fit the bill nicely.I 
hope.


Ken.. G0ORH

Sent from my iPad


> On 15 Aug 2017, at 22:21, Phillip Zminda  wrote:
> 
> Paul,
> 
> I have used a BOG, a Pixel Loop and a Wellbrook loop receiving antennas. The 
> BOG was ok but signal levels were very low and it needed a preamp. The BOG 
> needs a lot of tweaking and good grounds at both ends. K1FZ is the expert on 
> BOGs and can provide a wealth of information as well as custom transformers. 
> I used it one winter but didn’t want to leave in the yard when mowing season 
> started. The Pixel loop worked fairly well but I sold it and got a Wellbrook 
> ALA 1530, which I think has a cleaner design. The Wellbrook works quite well 
> at reducing the noise level. The signal levels are lower but with much 
> reduced noise. My loop rotor died and it’s in a fixed position but at about a 
> 6 ft. height it doesn’t seem highly directional. I think the Wellbrook is 
> still cheaper than the Pixel. Andrew Ikin at Wellbrook is very helpful in 
> answering any questions about loop applications 
> 
> My receive antenna is far enough from the transmit antenna that I have never 
> had any issues with the COR activating, even at 500 watts.
> 
> Good luck with your choice.
> 
> Phil 
> N3ZP
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Re: [Elecraft] Rx antenna on K3

[Don Wilhelm]

Dick,

Have you tried the regular antenna on the RX antenna jack?  I am trying 
to eliminate the possibility that your beverage antenna has 
significantly lower gain than your transmit antenna (beverages do have 
lower gain).

We need to know whether it is a K3 problem or an antenna problem.

The possible paths for the various antenna ports are shown in the 
diagrams in the K3 manual.  The configuration applicable to your 
situation depends on your installed options and the configuration menu 
settings.  We cannot give a good answer unless we know your K3 
configuration.

73,
Don W3FPR

On 9/29/2011 7:55 PM, Dick Allardyce (N4RA) wrote:
> I've had my K3 since June and everything seems to be working OK.  I just 
> recently tried an RX antenna (beverage), but it doesn't work.  I've tried 
> several antennas in the RX-in port, but no signal.  I've reviewed the manual 
> and CONFIG parameters, but no cigar.  I initially hooked it onto the 6m 
> preamp, but I removed the pre-amp to eliminate if from the equation.  Any 
> recommendations?  I feel I'm missing something.
>
> Regards,
> Dick N4RA
>
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[Elecraft] RX antenna & carrier-operated relay

[Fabio IZ4AFW / NZ1W]

Hi guys,
   I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op contesting.
Because of the interaction between the tx antennas and the beverage, on
some bands I have the COR (carrier operated relay) activating when I use
high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is selected, why
doesn't the K3 firmware disable it when pushing the ptt?

In fact, when I push the ptt I don't need the RX-ant part to be active,
as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when releasing
the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.

Thanks for any comment,
Ciao 73
 Fabio
 IZ4AFW / IO4W / NZ1W


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Re: [Elecraft] RX antenna & carrier-operated relay

[David Olean]

Hello Fabio

I have two beverages  that are somewhat close to my TX antenna. One 
had about 75 mw on it during TX while beverage #2 had about 1 watt! This 
is enough power to cause damage to preamps, so I made two power limiters 
and now the inputs are clipped at about 0 dBm. All it took was two 
transformers and two diodes in a box. Do you know what the power level 
is on your beverage during transmit periods?  Really high power levels 
could burn up the transformers.  Disconnecting the antenna is a good 
idea too.


Dave K1WHS


On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:

Hi guys,
I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op contesting.
Because of the interaction between the tx antennas and the beverage, on
some bands I have the COR (carrier operated relay) activating when I use
high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is selected, why
doesn't the K3 firmware disable it when pushing the ptt?

In fact, when I push the ptt I don't need the RX-ant part to be active,
as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when releasing
the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.

Thanks for any comment,
Ciao 73
  Fabio
  IZ4AFW / IO4W / NZ1W


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Re: [Elecraft] RX antenna & carrier-operated relay

[Jessie Oberreuter]

 The 2nd Rx port is on a relay, and not a particularly fast or quiet 
one in my K3.  I'd hate to operate QSK that way!  I could see a menu 
option that would activate it with a longer hang time, but you'd probably 
be better off with an external switch and/or front-end protector. -kb7psg



On Sat, 4 Mar 2017, Fabio IZ4AFW / NZ1W wrote:


Hi guys,
  I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op contesting.
Because of the interaction between the tx antennas and the beverage, on
some bands I have the COR (carrier operated relay) activating when I use
high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is selected, why
doesn't the K3 firmware disable it when pushing the ptt?

In fact, when I push the ptt I don't need the RX-ant part to be active,
as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when releasing
the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.

Thanks for any comment,
Ciao 73
Fabio
IZ4AFW / IO4W / NZ1W


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Re: [Elecraft] RX antenna & carrier-operated relay

[Fabio IZ4AFW / NZ1W]

Hi Dave,
   thanks for the suggestion.
I tried doing a quick measure using a cross-needle SWR meter today,
using the lowest setting.
On 40m the power appears to just deflect the needle, well below the 0.5W
mark. Probably I could say less than 250mW, maybe 100mW.
I usually have an external relay in a box to disconnect the RX antennas
while transmitting, but not today.
I was thinking why the RX antennas remain connected when transmitting if
there's not another use in a typical single-op station.

Thanks,
Ciao
Fabio
 IZ4AFW / IO4W / NZ1W


Il 04.03.2017 13:12, David Olean ha scritto:
> Hello Fabio
> 
> I have two beverages  that are somewhat close to my TX antenna. One
> had about 75 mw on it during TX while beverage #2 had about 1 watt! This
> is enough power to cause damage to preamps, so I made two power limiters
> and now the inputs are clipped at about 0 dBm. All it took was two
> transformers and two diodes in a box. Do you know what the power level
> is on your beverage during transmit periods?  Really high power levels
> could burn up the transformers.  Disconnecting the antenna is a good
> idea too.
> 
> Dave K1WHS
> 
> 
> On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:
>> Hi guys,
>> I was thinking of a possible firmware improvement related to the
>> carrier operated relay.
>> I use my radio on a small lot and recently I added a short beverage
>> antenna for low-bands receiving. My main activity is single-op
>> contesting.
>> Because of the interaction between the tx antennas and the beverage, on
>> some bands I have the COR (carrier operated relay) activating when I use
>> high power.
>> I know the good solutions, but my point is different.
>> As I have the COR activating only when the RX Ant input is selected, why
>> doesn't the K3 firmware disable it when pushing the ptt?
>>
>> In fact, when I push the ptt I don't need the RX-ant part to be active,
>> as I'm transmitting, and -at least in my setup- I have no other
>> rigs/devices that need that input (I mean, no in-band receivers and so
>> on).
>> Instead of using external relays (ptt-activated) that cut out the rx
>> input when I am transmitting, why the K3 firmware just doesn't disable
>> the RX ant input on its own (and re-enables it if needed when releasing
>> the ptt)?
>> Maybe I'm missing something here, or that could be a nice improvement
>> for a next firmware release.
>>
>> Thanks for any comment,
>> Ciao 73
>>   Fabio
>>   IZ4AFW / IO4W / NZ1W
>>
>>
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>> Questa e-mail è stata controllata per individuare virus con Avast
>> antivirus.
>> https://www.avast.com/antivirus
>>
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> 

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Re: [Elecraft] RX antenna & carrier-operated relay

[Fabio IZ4AFW / NZ1W]

Jessie,
   thanks for the input.
On RTTY and other constant-envelope modes you can hear the RX antenna
relay switching at the start of the tx and again when the tx ends. But
on SSB it's really annoying as it continuously clicks (well, at least it
protects the radio! HI). Just wondering why the RX antennas are not
disconnected by the firmware while transmitting.

Ciao,
 Fabio
 IZ4AFW / IO4W / NZ1W


Il 04.03.2017 20:12, Jessie Oberreuter ha scritto:
> 
>  The 2nd Rx port is on a relay, and not a particularly fast or quiet
> one in my K3.  I'd hate to operate QSK that way!  I could see a menu
> option that would activate it with a longer hang time, but you'd
> probably be better off with an external switch and/or front-end
> protector. -kb7psg
> 
> 
> On Sat, 4 Mar 2017, Fabio IZ4AFW / NZ1W wrote:
> 
>> Hi guys,
>>   I was thinking of a possible firmware improvement related to the
>> carrier operated relay.
>> I use my radio on a small lot and recently I added a short beverage
>> antenna for low-bands receiving. My main activity is single-op
>> contesting.
>> Because of the interaction between the tx antennas and the beverage, on
>> some bands I have the COR (carrier operated relay) activating when I use
>> high power.
>> I know the good solutions, but my point is different.
>> As I have the COR activating only when the RX Ant input is selected, why
>> doesn't the K3 firmware disable it when pushing the ptt?
>>
>> In fact, when I push the ptt I don't need the RX-ant part to be active,
>> as I'm transmitting, and -at least in my setup- I have no other
>> rigs/devices that need that input (I mean, no in-band receivers and so
>> on).
>> Instead of using external relays (ptt-activated) that cut out the rx
>> input when I am transmitting, why the K3 firmware just doesn't disable
>> the RX ant input on its own (and re-enables it if needed when releasing
>> the ptt)?
>> Maybe I'm missing something here, or that could be a nice improvement
>> for a next firmware release.
>>
>> Thanks for any comment,
>> Ciao 73
>> Fabio
>> IZ4AFW / IO4W / NZ1W
>>
>>
>> ---
>> Questa e-mail è stata controllata per individuare virus con Avast
>> antivirus.
>> https://www.avast.com/antivirus
>>
>> __
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Re: [Elecraft] RX antenna & carrier-operated relay

[Jim Brown]

Fabio,

You've seen my antenna farm -- Beverages run within 20-30 ft of my 160M 
TX antenna facing NE. Beverages feed a DX Eng preamp before going the 
sub-RX. I don't do anything special to protect the radio, but it does 
occasionally protect itself. I also use the Beverages on 80, 40, and 
30M, but TX antennas are much farther away (more than 100 ft). This is 
at 1.5 kW with a Ten Tec tube amp.


BTW -- I just added a pair of VE3DO loops tuned for 160M and aimed to 
EU.  Each loop is a rectangle 40 ft long and 10 ft vertical, with the 
bottom wire 2 ft off the ground and fed at the center. Details on 
OK1RR's website. The two loops are spaced 5/8 wavelength (350 ft). You 
probably don't have room for two loops, but you might fit one of them.


73, Jim K9YC

On Sat,3/4/2017 2:11 PM, Fabio IZ4AFW / NZ1W wrote:

Hi Dave,
thanks for the suggestion.
I tried doing a quick measure using a cross-needle SWR meter today,
using the lowest setting.
On 40m the power appears to just deflect the needle, well below the 0.5W
mark. Probably I could say less than 250mW, maybe 100mW.
I usually have an external relay in a box to disconnect the RX antennas
while transmitting, but not today.
I was thinking why the RX antennas remain connected when transmitting if
there's not another use in a typical single-op station.

Thanks,
Ciao
Fabio
  IZ4AFW / IO4W / NZ1W


Il 04.03.2017 13:12, David Olean ha scritto:

Hello Fabio

 I have two beverages  that are somewhat close to my TX antenna. One
had about 75 mw on it during TX while beverage #2 had about 1 watt! This
is enough power to cause damage to preamps, so I made two power limiters
and now the inputs are clipped at about 0 dBm. All it took was two
transformers and two diodes in a box. Do you know what the power level
is on your beverage during transmit periods?  Really high power levels
could burn up the transformers.  Disconnecting the antenna is a good
idea too.

Dave K1WHS


On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:

Hi guys,
 I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op
contesting.
Because of the interaction between the tx antennas and the beverage, on
some bands I have the COR (carrier operated relay) activating when I use
high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is selected, why
doesn't the K3 firmware disable it when pushing the ptt?

In fact, when I push the ptt I don't need the RX-ant part to be active,
as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so
on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when releasing
the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.

Thanks for any comment,
Ciao 73
   Fabio
   IZ4AFW / IO4W / NZ1W


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Re: [Elecraft] RX antenna & carrier-operated relay

[Don Pomplun]

Didn't I see something about "protectors" built into the K3S antenna 
connectors?  Are they like the transient discharge tubes that protect 
(somewhat) against lightning?  Is there also one on the RX antenna input?


Don   K2BIO


On 03/04/2017 06:05 PM, Jim Brown wrote:

Fabio,

You've seen my antenna farm -- Beverages run within 20-30 ft of my 
160M TX antenna facing NE. Beverages feed a DX Eng preamp before going 
the sub-RX. I don't do anything special to protect the radio, but it 
does occasionally protect itself. I also use the Beverages on 80, 40, 
and 30M, but TX antennas are much farther away (more than 100 ft). 
This is at 1.5 kW with a Ten Tec tube amp.


BTW -- I just added a pair of VE3DO loops tuned for 160M and aimed to 
EU.  Each loop is a rectangle 40 ft long and 10 ft vertical, with the 
bottom wire 2 ft off the ground and fed at the center. Details on 
OK1RR's website. The two loops are spaced 5/8 wavelength (350 ft). You 
probably don't have room for two loops, but you might fit one of them.


73, Jim K9YC

On Sat,3/4/2017 2:11 PM, Fabio IZ4AFW / NZ1W wrote:

Hi Dave,
thanks for the suggestion.
I tried doing a quick measure using a cross-needle SWR meter today,
using the lowest setting.
On 40m the power appears to just deflect the needle, well below the 0.5W
mark. Probably I could say less than 250mW, maybe 100mW.
I usually have an external relay in a box to disconnect the RX antennas
while transmitting, but not today.
I was thinking why the RX antennas remain connected when transmitting if
there's not another use in a typical single-op station.

Thanks,
Ciao
Fabio
  IZ4AFW / IO4W / NZ1W


Il 04.03.2017 13:12, David Olean ha scritto:

Hello Fabio

 I have two beverages  that are somewhat close to my TX antenna. 
One
had about 75 mw on it during TX while beverage #2 had about 1 watt! 
This
is enough power to cause damage to preamps, so I made two power 
limiters

and now the inputs are clipped at about 0 dBm. All it took was two
transformers and two diodes in a box. Do you know what the power level
is on your beverage during transmit periods?  Really high power levels
could burn up the transformers.  Disconnecting the antenna is a good
idea too.

Dave K1WHS


On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:

Hi guys,
 I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op
contesting.
Because of the interaction between the tx antennas and the 
beverage, on
some bands I have the COR (carrier operated relay) activating when 
I use

high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is 
selected, why

doesn't the K3 firmware disable it when pushing the ptt?

In fact, when I push the ptt I don't need the RX-ant part to be 
active,

as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so
on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when 
releasing

the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.

Thanks for any comment,
Ciao 73
   Fabio
   IZ4AFW / IO4W / NZ1W


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Re: [Elecraft] RX antenna & carrier-operated relay

[Fabio IZ4AFW / NZ1W]

Jim,
   thanks for the info about the VE3DO loop, I'll check OK1RR webpage out.
My short beverage runs away from the tower, starting about 5 meters from 
it and going towards USA (NW). Unfortunately I don't have much more 
space to relocate the beverage farther away.
My idea was to ask adding a menu option that automatically switches off 
the RX-ant input when the operator pushes the ptt, as usually the 
single-op doesn't need to keep it connected while transmitting. Of 
course it should also re-enable it at the end of the tx if needed.
I know that an external relay is easy to use, but this could come for 
free when a new firmware is released.


Ciao,
 Fabio
 IZ4AFW / IO4W / NZ1W


Il 05.03.2017 00:05, Jim Brown ha scritto:

Fabio,

You've seen my antenna farm -- Beverages run within 20-30 ft of my 
160M TX antenna facing NE. Beverages feed a DX Eng preamp before going 
the sub-RX. I don't do anything special to protect the radio, but it 
does occasionally protect itself. I also use the Beverages on 80, 40, 
and 30M, but TX antennas are much farther away (more than 100 ft). 
This is at 1.5 kW with a Ten Tec tube amp.


BTW -- I just added a pair of VE3DO loops tuned for 160M and aimed to 
EU.  Each loop is a rectangle 40 ft long and 10 ft vertical, with the 
bottom wire 2 ft off the ground and fed at the center. Details on 
OK1RR's website. The two loops are spaced 5/8 wavelength (350 ft). You 
probably don't have room for two loops, but you might fit one of them.


73, Jim K9YC

On Sat,3/4/2017 2:11 PM, Fabio IZ4AFW / NZ1W wrote:

Hi Dave,
thanks for the suggestion.
I tried doing a quick measure using a cross-needle SWR meter today,
using the lowest setting.
On 40m the power appears to just deflect the needle, well below the 0.5W
mark. Probably I could say less than 250mW, maybe 100mW.
I usually have an external relay in a box to disconnect the RX antennas
while transmitting, but not today.
I was thinking why the RX antennas remain connected when transmitting if
there's not another use in a typical single-op station.

Thanks,
Ciao
Fabio
  IZ4AFW / IO4W / NZ1W


Il 04.03.2017 13:12, David Olean ha scritto:

Hello Fabio

 I have two beverages  that are somewhat close to my TX antenna. 
One
had about 75 mw on it during TX while beverage #2 had about 1 watt! 
This
is enough power to cause damage to preamps, so I made two power 
limiters

and now the inputs are clipped at about 0 dBm. All it took was two
transformers and two diodes in a box. Do you know what the power level
is on your beverage during transmit periods?  Really high power levels
could burn up the transformers.  Disconnecting the antenna is a good
idea too.

Dave K1WHS


On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:

Hi guys,
 I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op
contesting.
Because of the interaction between the tx antennas and the 
beverage, on
some bands I have the COR (carrier operated relay) activating when 
I use

high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is 
selected, why

doesn't the K3 firmware disable it when pushing the ptt?

In fact, when I push the ptt I don't need the RX-ant part to be 
active,

as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so
on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when 
releasing

the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.

Thanks for any comment,
Ciao 73
   Fabio
   IZ4AFW / IO4W / NZ1W


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[Elecraft] Rx antenna for K3's 2nd receiver

[Ken G Kopp]

My K3's second receiver is connected directly to the BNC antenna connector
with a TMP M/F jumper cable I made, and is permanently connected to a 6M
omni antenna.  It's (only) used for listening for 6M openings.

73

Ken - K0PP
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