Re: [Elecraft] K3 FSK power transients

[Ken_ke2n via Elecraft]

yup.  I am seeing this on FSK441 and Data A mode.  I recently acquired a
power meter that shows average and peak power and I am getting getting PEP =
1.8 times average on this data mode.  Traced it to the K3 audio response on
transmit. I am using the 8 pole SSB filter. It seems the 882 Hz and 1323 Hz
tones are down from the other two tones (or the other tones are hot relative
to these two, depending on your point of view).  When I transmit a single
tone (RRR or 73 report for example) the ALC brings things up to full output. 
When I transmit mixed characters then the ALC sets the output based on the
highest tone and the average is down accordingly.

It is not the audio card.  I looped the audio card output back to the input
and the tones are all the same level.



-
73
Ken

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Re: [Elecraft] KX3 and PX3 with 2m Transverter comments

[Jim Brown]

On Wed,5/27/2015 10:26 AM, David Anderson wrote:

Unfortunately it looks like this is not going to work out for me, as the level 
of radiated noise at VHF from both the PX3 severely masks weak signals, there 
is also a huge radiated birdie from the KX3 near 144.4MHz.


Questions and observations. Questions first. Did you build these units 
or were they factory assembled?  If you built them, dig you carefully 
scrape all the tape from the interior parts of the chassis where they 
screw together? Not doing so could be part of the problem. To fix this, 
you'll have to take it apart and scrape them.


Observation. The KX3 has Pin One Problems at most of the connectors 
mounted on the left side -- note that only the Mic and Phones jacks are 
screwed to the chassis. My PX3 is out on loan, and I don't remember 
whether our not it has the same problem. Any cable connected to a Pin 
One Problem becomes an antenna to RX and TX any trash.


Common mode chokes are the band-aid for Pin One Problems. For 2M, the 
weapon of choice is one or more Fair-Rite #43 clamp-ons added to the 
offending cables. Also, the KX3 chassis should be bonded (short, fat 
copper) to the PX3 chassis.


No guarantee that these measures will fix your issue, but I would try 
them before giving up. Also, contact Elecraft support and get them 
engaged. They talk do lots of people, and chances are they've seen this 
before and may know of a fix.


See my website for the tutorials about "The Pin One Problem."

73, Jim K9YC


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Re: [Elecraft] Dayton Orders

[Eric Swartz - WA6HHQ, Elecraft]

Lisa just corrected me - They have everything entered and confirmed except the 
P3TXMON orders. Those are going in next and will take at least through this 
weekend or early next week. We had a ton of those too.


Eric
elecraft.com

On 5/27/2015 5:03 PM, Eric Swartz - WA6HHQ, Elecraft wrote:

Lisa and her team just caught up with entering everything from Dayton today. 
Whew!

Contact her at sa...@elecraft.com if you placed an order at Dayton and have 
not yet received an email order confirmation.


Eric
/elecraft.com/

On 5/27/2015 3:30 PM, Ian wrote:

Got mine today.
73, Ian N8IK


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dan
Atchison via Elecraft
Sent: Wednesday, May 27, 2015 15:47
To:elecraft@mailman.qth.net
Subject: [Elecraft] Dayton Orders

Just curious if anyone has yet received a confirmation of orders placed at
Dayton?

Dan -- N3ND






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Re: [Elecraft] Dayton Orders

[Eric Swartz - WA6HHQ, Elecraft]

Lisa and her team just caught up with entering everything from Dayton today. 
Whew!

Contact her at sa...@elecraft.com if you placed an order at Dayton and have not 
yet received an email order confirmation.


Eric
/elecraft.com/

On 5/27/2015 3:30 PM, Ian wrote:

Got mine today.
73, Ian N8IK


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dan
Atchison via Elecraft
Sent: Wednesday, May 27, 2015 15:47
To: elecraft@mailman.qth.net
Subject: [Elecraft] Dayton Orders

Just curious if anyone has yet received a confirmation of orders placed at
Dayton?

Dan -- N3ND




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Re: [Elecraft] Dayton Orders

[Ian]

Got mine today.
73, Ian N8IK 


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dan
Atchison via Elecraft
Sent: Wednesday, May 27, 2015 15:47
To: elecraft@mailman.qth.net
Subject: [Elecraft] Dayton Orders

Just curious if anyone has yet received a confirmation of orders placed at
Dayton?

Dan -- N3ND


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delivered to ik7...@verizon.net
-
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5941 / Virus Database: 4354/9882 - Release Date: 05/27/15

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Re: [Elecraft] K3, diversity and noise reduction

[Alan]

The suggestion is to use the two identical receivers in the K3 to null 
noise and interference.  The idea is to connect each receiver to a 
different antenna so the signals arrive with different phases.  The 
phase difference will generally be different for the desired signal and 
the interference or noise, so by combining the two signals with the 
proper amplitude and phase you can null out the undesired signal.


There are units you can buy today that do that by combining the RF 
signals from the two antennas before they are sent to the receiver.  The 
question is whether you can do it at audio frequencies rather than at 
RF.  Theoretically you can, since the demodulated SSB signal is just a 
frequency translation of the RF.  If that works, it would be simply a 
question of new firmware in the K3, since the audio from the two 
identical receivers is already available to the DSP.


The issue is that the amplitude and phase responses of the crystal 
filters in the two receivers are not identical.  To get a good null, the 
difference in the phase shift through the two filters would have to 
track within much less than 360 degrees across the passband.  In other 
words, the variation of the difference in group delay would have to be 
much less than 1/8 usec with an 8.215 MHz IF.


A 2.5 kHz bandwidth filter probably has on the order of a msec group 
delay.  I doubt the two filters typically track each other to better 
than a few usec across the passband, if that.


You probably could get a good null at a single CW frequency, but I don't 
see how you could hope to get the null to hold across the passband.


Alan N1AL
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Re: [Elecraft] Dayton Orders

[k3ndm]

Dan, 
I bought an XG-3 at Dayton. I had my confirmation by Tuesday afterward. Eric 
took my order and Lisa did some follow up paperwork for me. 

73, 
Barry 
K3NDM 


- Original Message -

From: "Dan Atchison via Elecraft"  
To: "elecraft"  
Sent: Wednesday, May 27, 2015 3:46:38 PM 
Subject: [Elecraft] Dayton Orders 

Just curious if anyone has yet received a confirmation of orders placed 
at Dayton? 

Dan -- N3ND 


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Re: [Elecraft] KX3 and PX3 with 2m Transverter comments

[Vic Rosenthal 4X6GP/K2VCO]

I don't have either a KX3 or PX3, and my 2m work is limited to FM, but 
the problems that you describe could be due to various fixable problems. 
For example, some P3s had spur problems due to bad electrical contact 
between parts of the enclosure, as well as improperly attached BNC 
connectors on the cable between the P3 and K3. I suggest that before you 
make any expensive decisions that you contact supp...@elecraft.com. I'm 
sure they will take your issues seriously.


73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/


Vic

On 27 May 2015 20:26, David Anderson wrote:

I bought a KX3 and PX3 with a view towards using them with an
external high performance transverter for 144MHz (with an IF of
14MHz). My main interest being weak signal operation on VHF. The
ability to use the I/Q outputs with a sound card or PX3 and the
excellent receiver performance in reviews seemed to indicate this
would meet my needs.

Unfortunately it looks like this is not going to work out for me, as
the level of radiated noise at VHF from both the PX3 severely masks
weak signals, there is also a huge radiated birdie from the KX3 near
144.4MHz.

Turning on the PX3  and listening on 144MHz gives bands of noise
every few kHz which mask weak signals in the noise and I can liken it
to listening to the 6m band with a Band 1 TV transmitter putting out
video sidebands over the band.

Without the PX3 switched on I can hear distant beacons in the noise,
but they are buried by the PX3 when it is switched on and plugged in
to the KX3. The antenna is 60 feet away from the rigs and is fed by
Heliax. Have tried separate supplies for transverter and PX3, running
from batteries on KX3, nothing seems to reduce the QRM from the PX3
to an acceptable level.

There also is a huge S9 spurious near 144.4 from the KX3 that is
independent of band/freq/mode. Confirmed by listening on another
receiver in the shack.

It is so hugely disappointing, I had looked forward to this day,
having finally got my rotator and antenna back up on the tower I am
faced with looking for another rig to drive the 2m transverter.
Unfortunately I don't think it will be Elecraft. Perhaps Elad might
be an alternative, but I need to consult the weak signal VHF
community first. I will keep the KX3 and PX3 for QRP HF work most
likely as selling it at a loss would be a bitter alternative.

On HF where the band noise and signal strengths are much higher I
don't find the same problems, though there are still spurious signals
shown on the PX3 there. I could live with them I think, but on what
is a nice quiet 144MHz band here, the racket from the PX3 is
impossible to put up with.

Incidentally I wonder what causes that big birdie near 144.4 from the
KX3, and if is it related to the similar one reported on the K3?
There doesn't seem to be a lot of commonality between the designs.

Sorry if this sounds like I am trolling, I am not, I love the
Elecraft ethos and products, it is just they don't appear to work for
my specific needs. Unfortunately it wasn't possible to try before you
buy here and I ended up being the guinea pig.

73

David Anderson GM4JJJ

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[Elecraft] Dayton Orders

[Dan Atchison via Elecraft]

Just curious if anyone has yet received a confirmation of orders placed 
at Dayton?


Dan -- N3ND


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Re: [Elecraft] K3/0-Mini - Experiences?

[Gerry Hull]

Good perception, Jim... experience pays off.   We had this same problem
with Andy, K2LE.  We have two remoterig remote ends connected to the same
common remote station.  My audio has been flawless.  Andy kept having poor
audio -- muffled, microphonic sounds but no clear audio.  It turned out to
be the power supply, which was an underpowered switching supply.  The
RemoteRig box does not come with a supply.  I power mine off of a 4A
switcher,  and it's fine.A 1A supply should work, but they seem to have
issues.

73, Gerry W1VE


On Wed, May 27, 2015 at 1:45 PM, Jim Brown 
wrote:

> On Wed,5/27/2015 3:04 AM, John K3TN via Elecraft wrote:
>
>> Others have had the same audio issues, others just naturally connect their
>> headset to the RemoteRig, others have had no problems with the Mini - your
>> mileage may vary.
>>
>
> Hi John,
>
> I know nothing about these products other than a vague one paragraph
> functional description, but I do suspect an issue with the audio interface
> and/or how the units are powered and bonded. Take a look at the pdf of my
> slides for a talk I did on this topic at Pacificon last fall.
> http://k9yc.com/GroundingAndAudio.pdf
>
> 73, Jim K9YC
>
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Re: [Elecraft] K3/0-Mini - Experiences?

[Jim Brown]

On Wed,5/27/2015 3:04 AM, John K3TN via Elecraft wrote:

Others have had the same audio issues, others just naturally connect their
headset to the RemoteRig, others have had no problems with the Mini - your
mileage may vary.


Hi John,

I know nothing about these products other than a vague one paragraph 
functional description, but I do suspect an issue with the audio 
interface and/or how the units are powered and bonded. Take a look at 
the pdf of my slides for a talk I did on this topic at Pacificon last 
fall. http://k9yc.com/GroundingAndAudio.pdf


73, Jim K9YC
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[Elecraft] KX3 and PX3 with 2m Transverter comments

[David Anderson]

I bought a KX3 and PX3 with a view towards using them with an external high 
performance transverter for 144MHz (with an IF of 14MHz). My main interest 
being weak signal operation on VHF. The ability to use the I/Q outputs with a 
sound card or PX3 and the excellent receiver performance in reviews seemed to 
indicate this would meet my needs.

Unfortunately it looks like this is not going to work out for me, as the level 
of radiated noise at VHF from both the PX3 severely masks weak signals, there 
is also a huge radiated birdie from the KX3 near 144.4MHz.

Turning on the PX3  and listening on 144MHz gives bands of noise every few kHz 
which mask weak signals in the noise and I can liken it to listening to the 6m 
band with a Band 1 TV transmitter putting out video sidebands over the band. 

Without the PX3 switched on I can hear distant beacons in the noise, but they 
are buried by the PX3 when it is switched on and plugged in to the KX3. The 
antenna is 60 feet away from the rigs and is fed by Heliax. Have tried separate 
supplies for transverter and PX3, running from batteries on KX3, nothing seems 
to reduce the QRM from the PX3 to an acceptable level.

There also is a huge S9 spurious near 144.4 from the KX3 that is independent of 
band/freq/mode. Confirmed by listening on another receiver in the shack.

It is so hugely disappointing, I had looked forward to this day, having finally 
got my rotator and antenna back up on the tower I am faced with looking for 
another rig to drive the 2m transverter. Unfortunately I don't think it will be 
Elecraft. Perhaps Elad might be an alternative, but I need to consult the weak 
signal VHF community first. I will keep the KX3 and PX3 for QRP HF work most 
likely as selling it at a loss would be a bitter alternative.

On HF where the band noise and signal strengths are much higher I don't find 
the same problems, though there are still spurious signals shown on the PX3 
there. I could live with them I think, but on what is a nice quiet 144MHz band 
here, the racket from the PX3 is impossible to put up with.

Incidentally I wonder what causes that big birdie near 144.4 from the KX3, and 
if is it related to the similar one reported on the K3? There doesn't seem to 
be a lot of commonality between the designs.

Sorry if this sounds like I am trolling, I am not, I love the Elecraft ethos 
and products, it is just they don't appear to work for my specific needs. 
Unfortunately it wasn't possible to try before you buy here and I ended up 
being the guinea pig.

73

David Anderson GM4JJJ 
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Re: [Elecraft] K3/0-Mini - Experiences?

[Gerry Hull]

​I've been using the K3/0 mini for about a year for casual DXing and for
many contests.
The K3/0 mini is perfect -- a mirror of your K3.​  Once you get used to the
the fact that
you are setting menus on the Remote radio, all will be good.

The mix that is important is how you use the K3/0 to interconnect it to the
remote shack.
As stated here, many users are using the MicroBit RemoteRig product.  This
adds about $750+/-
to your remote cost, but provides a far superior result than any other
method.

The killers in remote operation are latency and jitter (jitter being the
varying difference in latency over time.)
The Microbit boxes use dedicated hardware, and a very flexible software
configuration. to allow you to tailor the box to your needs.   The
RemoteRig components are not designed specifically for the K3; therefore,
they have a generic interface design, and Elecraft sells the specific
interconnect cable for the K3/0.

The majority of my contesting experience has been on CW in the Majors: CQWW
and ARRL DX, running remote to K2LE/1 from my QTH in NH.  The shack has
1.5Mb/.5Mb DSL service.  The average latency on the connection varies from
120-150mS, with very manageable jitter.   We run the RemoteRig boxes with
8kHz bandwidth, and this works very well.   I don't feel handicapped by
being remote at all... In many QSOs, I get unsolicited comments of great
audio on SSB, and no issues with CW.  It is just like being there.

The Microbit boxes do have a lot of configuration parameters.  You also
have to know how to port forward from your router in the shack (unless you
are using the box in your own home, and both ends are on the same LAN).  If
you are not familiar with networking, configuring the boxes can be a
challenge.  As the others have stated, the forum on the RemoteRig site is a
good resource --> search it with Google first, as much of your frustration
has already been experienced by others.

Their is another solution with the K3/0 which is essentially 15-minute plug
and play.  It is a free solution, once you own the K3/0.   This is the
software and website of Brandon, KG6YPI -- an Elecraft employee and the guy
you usually talk to if you are experiencing problems with the Microbit gear
and K3/0.

Your K3/0 has a USB connector on it.   This connector can be plugged into a
PC, and two codecs (send/receive) and two RS-232 connections (Rig Control
and passthrough) are automatically installed.

Brandon's site is www.remotehams.com.   Their is PC software for the remote
end as well as the server end.
You can use Brandon's software without the K3/0 -- but it has some very
cool features:
- If you have a K3/0 and a K3 at the station, you get full control of the
radio with all features.
- If you want to connect to a remote on RemoteHams, where the remote is NOT
a K3, you can still use the
K3/0 for frequency control and other features.

I use RemoteHams to control Dom, 3Z9DX's station, and run SSB from Poland.
  It works very well, though the overall
latency is much higher.

CW still has some work to be done.  But I know Brandon is getting there.
I've asked Dom if I could try his station in some contest on CW -- it will
be interesting to see how that works out.

I use both RemoteHams and the Microbit RemoteRig solution with the K3/0,
and am very happy with both; I will continue to use RemoteRig in serious
contest situations.

73, Gerry W1VE
Hancock, NH





Gerry Hull, W1VE   | Hancock, NH USA | +1-603-499-7373
AKA: VE1RM | VY2CDX | VO1CDX | 6Y6C | 8P9RM
 

 

On Tue, May 26, 2015 at 8:39 AM, jlbates4  wrote:

> I'm in the midst of a terrible urge to spend some $$'s and the K3/0'-Mini's
> siren call is hard to resist.  I've done a bit of reading on the RemoteRig
> products and there is scare info on the K3/0 mini.
>
> I'd love to hear any testimonials, rig setups, real-world latency
> commentary, or even how you manage the firmware.
>
> Anyone play with the codecs?  Thoughts on the different audio quality?
>
> My current though is using the K3/0-Mini on the same local network and I do
> some occasional work travel, might be nice to take it with me.
>
> Comments encouraged!!!
>
>
> 73 de K8OI
>
>
>
> -
> K8OI
> mailto:jlbat...@gmail.com
> (804) 592-1068
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/K3-0-Mini-Experiences-tp7603508.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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[Elecraft] KX1 for sale

[Jim Leder]

I recently upgraded my portable radio from an Elecraft KX1 to a wonderful KX3. 
I no longer need the KX1. The serial number is 2500 and it is complete with the 
Elecraft mini paddle, ATU, battery tray and the 30/80 adapter. I did not do the 
build, but I think Don, W3FPR did. In any case, he did a checkup on it last 
year and pronounced it fit for duty. I will ship it (Conus) and absorb the 
Paypal charges for $400. Pictures available on request. Email me off the 
reflector if interested.

k8cxm at hotmail . com

Jim Leder ... K8CXM
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[Elecraft] KAT2 for sale

[Carl Yaffey]

I’m reposting this in case you missed it. I have a KAT2 for sale from the SK 
estate. $113. Picture upon request.
73,
Carl Yaffey  K8NU
Recording studio.
cyaffeyno_s...@gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com
http://www.bluesswing.com









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Re: [Elecraft] KAT500

[Cady, Fred]

Hi Larry,
I have a description of the tuning procedures that the KAT500 goes through at 
http://www.ke7x.com/home/kat500-and-kxpa100-tuners that you might find useful.
Cheers and 73,
Fred KE7X

Author of:
"The Elecraft K3: Design, Configuration and Operation 2nd ed"
"The Elecraft KX3 - Going for the summit"
"The Elecraft KPA500 and KAT500 - the K-Line Dream Station"
Printed, coil bound copies of these are all available at www.elecraft.com
The following are available at KE7X.com:
KPA500 and KAT500 Quick Set Up Guide
http://www.ke7x.com/home/k-line-introduction-and-set-up-guide
KAT500 and KXPA500 Tuner Operation
http://www.ke7x.com/home/kat500-and-kxpa100-tuners

"The Elecraft KXPA100, PX3 and 2M/4M Transverters - Assembling the KX3-Line 
Station" available at www.lulu.com.


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Larry 
Snyder
Sent: Tuesday, May 26, 2015 5:51 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KAT500

Good Morning

 

I have a KAT500 with a vertical on ANT 1 and a Hex on ANT 3. 

 

I go to 20 meters with Auto flashing an put the radio in AM and the KAT500 
tunes and finds a good SWR - all is fine.  Then I play around with other 
frequencies and then come back and for some reason the KAT500 appears to not 
remember the tuning parameters and then retunes again for the same frequency
on the same antenna.   Why is this??  This happens frequently (i.e.: not
remembering the settings and going into retune).  

 

Also, the SWR meter on the K3 is always blank (i.e.: no bars) while on the
K3 and KPA500 I see the SWR at 1.5??

 

73s from Colombia 

Larry  HK2LS

 

--

Larry Snyder, RN.ORG

"Thousands of Nurses Depend on www.RN.org   for their 
Nursing CEUs Daily!"

 

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Re: [Elecraft] KXPA100 Kit Review

[Patrick Cosgrove]

Jim,

Nice review.  Sounds like you have a configuration very similar to my 
own.  I recently put together a case system for transporting my 
KX3/PX3/KXPA100 setup on car trips for remote operations.  I have a bit 
more to take with me as I do mostly digital modes.  For what it's worth, 
you can see what I put together on my QRZ page:


http://www.qrz.com/db/W2COS

This arrangement has worked well for me, of course YMMV.  I know looking 
at what others had done helped me a lot as I was putting this together..


73,
Patrick W2COS
-

On 5/27/15 8:30 AM, elecraft-requ...@mailman.qth.net wrote:
This is mainly for those who are contemplating getting the KXPA100 to 
go along with a KX3 (with or without the PX3).


Picked my KXPA100 kit up at the UPS customer center this morning about 
9:15.  Got it home about 10:00, unpacked and inventoried by 10:30 and 
completely assembled by 11:15.  So far this is the simplest kit I've 
ever built and really worth doing to save money.  The only tools it 
took were a #1 Phillips screwdriver and a pair of needle nose pliers.


What took the longest was figuring out how to hook it up to the 
KX3/PX3 combination.  Nothing in the KXPA100 assembly or Operating 
manuals that I found.  Had to go to the PX3 manual to find the 
information.  It might be a good idea for the manual writer/editor to 
include at least a reference to the PX3 manual for this 
configuration.  If you don't have a PX3, instructions for hooking 
everything together in the KXPA100 book is pretty clear.  I heartily 
recommend the optional cable kit and it really simplifies things and 
you don't have to spend a lot of time making something up to making it 
play nice.


Once I had everything connected and the KXPA power output display 
calibration done, I hooked it to my Alpha Delta DX-LB 160/80/40 meter 
dipole to check the tuner's capability.  It found a match on all bands 
160-6 meters and no worse than a 1.2:1 SWR so it's certainly as good 
as the tuner in the K3.


I have one of those MFJ 4230MV compact 30 amp switching power supplies 
and got everything cabled so it powers the KX3, a stereo audio speaker 
bar, PX3, KXAT100 and when needed a small clip-on LED logging light.  
By the way, this supply is very quiet RF wise and I can't find any 
noise from it on any ham band powering either the KX3 or K3 from it (I 
have the 45 amp MFJ 4245MV supply on the K3/P3 main operating desk and 
it's quiet too).


I'm not currently planning on operating it mobile, but we're going to 
be visiting relatives in Texas, Louisiana and Florida next month so 
will have a collapsible vertical and the KX3 setup with me.  It will 
be nice to have the 100 watt amp along to help overcome poor band 
conditions when the KX3's normal output isn't quite enough to maintain 
a QSO.


I really like the way the firmware is set up in the KX3 and KXPA100 so 
that operation is as close to seamless as it can be. The auto bypass 
of the internal KX3 tuner when the amp is on is really nice and the 
auto-on of the amp when the KX3 is turned on is SUPER nice!


The next project will be setting up as compact a carrying case as 
possible to safely transport the KX3, PX3, KXPA100 and all the 
accessories.


Jim - W0EB 



--
*Patrick A. Cosgrove*

Email:patrick_cosgr...@hotmail.com
LinkedIn:   www.linkedin.com/in/patrickacosgrove/

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[Elecraft] K3/0-Mini - Experiences?

[Ellam, Timothy St. J.]

I have used the RemoteRig with a K3/0 (not the mini) to a K3/KPA500 combination 
and a SteppIR vertical. It works fine, but the RX audio is certainly not a 
strong as directly through the RemoteRig.

As others have noted this not quite plug and play and some tweaking of the 
parameters is required. There is a lot of good information on the RemoteRig 
forum and DJ0QN has some excellent network guides for those who have a limited 
understanding of this area (like me).

Internet connectivity is key. You need solid connections at both ends otherwise 
latency is an issue.

All in all though the system is seamless and is a game changer for remote 
operation.

Tim VE6SH


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Re: [Elecraft] K3, diversity and noise reduction

[David Cole]

No kidding, I was thinking of suggesting this as well...  
-- 
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net

For MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
For Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
For MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info


On Tue, 2015-05-26 at 21:01 -0700, David Gilbert wrote:
> I have on three different occasions requested of Elecraft that such a 
> feature be added to the K3.  Two of those requests never received a 
> response, while the third got a "we'll see if anyone in engineering is 
> interested" reply (apparently nobody was).
> 
> Personally, I think this is a significantly missed opportunity to expand 
> the usefulness of diversity reception in the K3, especially now that the 
> new synths retain phase lock when changing frequency. If even only one 
> receiver in the K3 had the ability to time shift the audio signal, it 
> would work.  The K3 already has separate volume controls and already has 
> the ability to mix the two channels.  With two antennas separated 
> horizontally (i.e., two verticals a suitable distance apart), the phase 
> could be adjusted to boost a desired signal by roughly 3db or null an 
> undesired signal (noise or QRM) by 20 to 30 db or more (depending upon 
> how stable the signals were). Directional antennas are not needed at all.
> 
> I also think it would be interesting, and maybe useful, to use two 
> antennas separated vertically, such as a couple of dipoles or yagis on a 
> tower.  Adjusting the phase could potentially drop a severe notch on an 
> interfering signal IN THE SAME DIRECTION as a desired signal.
> 
> Phase is preserved in the down conversion to audio so all this could be 
> accomplished at the audio level.  I'm not saying that's the best place 
> to do it, but worst case I'm going to learn enough software code to do 
> it myself using the sound card of my computer since nobody else seems 
> interested.
> 
> 73,
> Dave   AB7E
> 
> 
> On 5/26/2015 5:45 PM, Harry Yingst via Elecraft wrote:
> > It would be interesting to see if that feature could be added.
> >
> >
> >
> >  Original message 
> > From: Don Wilhelm 
> > Date: 05/26/2015  8:26 PM  (GMT-05:00)
> > To: Tony McRae , elecraft@mailman.qth.net
> > Subject: Re: [Elecraft] K3, diversity and noise reduction
> >
> > Tony,
> >
> > You are looking at information about how to compensate two unequal
> > receivers for true diversity reception - two orthogonally opposed
> > antennas receiving the same signal.
> > The K3 makes that easy with a sub-receiver that is identical with the
> > main receiver and they are phase locked together in diversity. When
> > placed in diversity mode (using two antennas hopefully having different
> > polarity or directional characteristics), you will hear enhancement of
> > the reception from whichever antenna is receiving the best signal - you
> > have each receiver in each of your ears, and the human brain will
> > respond to the best signal.  No phase adjustment is necessary.
> >
> > OTOH, if you are looking to reduce the noise of your plasma TV and
> > routers, that is another form of reception that could (but not
> > necessarily) be related to diversity.  You would want to use a
> > directional antenna aimed at the noise source to feed one receiver while
> > being able to adjust the amplitude and phase of that noise signal to
> > cancel out the noise source.
> > It is possible that you could use the K3 with subRX to do that, the AF
> > and RF gain controls will do the amplitude part of the process and if
> > you provide an external mechanism for changing the phase of the two
> > antennas, you may be successful.  The easiest phase change is simply to
> > flip the noise receive antenna terminals which should achieve a 180
> > degree phase shift, but the actual phase shift will depend on several
> > other factors such as the length of the antenna feedlines and the
> > physical placement of the antennas (which control the arrival time of
> > the noise signal at the antennas).
> >
> > So, yes, it is possible that with suitable antennas placed properly, the
> > K3 with subRX *could* serve as a noise cancelling system, but it was not
> > designed for that purpose, it was designed to counter propagation
> > effects such as fading due to polarization.
> >
> > 73,
> > Don W3FPR
> >
> > On 5/25/2015 9:00 PM, Tony McRae wrote:
> >> I have been watching some youtube clips showing how by adjusting the phase 
> >> and amplitude of two received signals on a diversity receiver local noise 
> >> can be reduced by more than 20db.
> >> This would be particularly useful to me as I have the dirtiest plasma TV 
> >> on one side of me and a gaggle of cheap ADSL routers on the other. When 
> >> pointed at them with my yagi the noise floor on 20-15m is over S7.
> >>
> >> The equipment used in the clip was the ANAN 100D SDR.
> >> Is anyone aware 

[Elecraft] RES: K3/0-Mini - Experiences?

[py5eg]

Hi Folks
I'm using the K3/0 mini with a K3 on the base and remoterig.
This setup added with a ACOM 2000 plus DB-42 in on the air for 2 years now and 
it is working extremelly well
I´m very active in the CQ DX Marathon and without the remote station I would 
have no condition to be competitive.
Regards
Oms


-Mensagem original-
De: Elecraft [mailto:elecraft-boun...@mailman.qth.net] Em nome de Randy
Enviada em: terça-feira, 26 de maio de 2015 18:06
Para: jlbat...@gmail.com; elecraft@mailman.qth.net
Assunto: [Elecraft] K3/0-Mini - Experiences?

I am fairly new to Elecraft and the K3 but I do have the K3/0 mini and the 
Remoterig twins for K3.  I ordered and installed the WiFi board for the 
Remoterig. All works excellent. As long as the WiFi connection is OK, the K3/0 
mini connects to the remote site and operates as if you are there.
Many QSO's using the remote equipment and the other party cannot tell the 
difference. I am just using the standard MH2 mike. I do like the WiFi option as 
if allows me to establish stored WiFi connects that are remembered when I 
return so I simply set up the K3/0 mini and remote rig, turn it on and with a 
minute or so, it is ready to operate.

 

Latency is small and not really noticeable so no issues there.  

 

You can use the K3/0 mini within your network but you may need a different 
destination IP than if you are outside the network. I have operated both ways.

 

I have not played with the codecs yet. My audio reports are good.

 

I do have a PC at the remote site and I connect to it with Team Viewer which 
allows me to operate and monitor the KAT500 and KPA500 via my laptop. I use the 
Elecraft beta control software for this.

 

Home QTH is Calgary, Alberta. My K3 is British Columbia (VE7). I have operated 
from Phoenix, Fort Lauderdale and Calgary on a fairly regular basis. And, at 
the K3 site, take the K3/0 mini onto the deck outside and operate there when 
the weather is nice.

 

Just a few comments.

 

 

Randy

VE6RMB

 


-

I'm in the midst of a terrible urge to spend some $$'s and the K3/0'-Mini's 
siren call is hard to resist.  I've done a bit of reading on the Remoterig 
products and there is scare info on the K3/0 mini.

 

I'd love to hear any testimonials, rig setups, real-world latency commentary, 
or even how you manage the firmware.

 

Anyone play with the codecs?  Thoughts on the different audio quality?

 

My current though is using the K3/0-Mini on the same local network and I do 
some occasional work travel, might be nice to take it with me.

 

Comments encouraged!!!

 

 

73 de K8OI

 

 

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Re: [Elecraft] K3/0-Mini - Experiences?

[John K3TN via Elecraft]

I've been using the Remote Rig interfaces with my K3 for several years and
the K3/Mini for the past 6 months or so. I'm a big fan of the Remote Rig
devices, not a fan of the K3/Mini.

I started out doing remote operating with the K4VV group using an all
software approach and the Remote Rig devices are an enormous improvement -
reduction in latency, better audio quality, the ability to essentially just
have a very long mic/key/headset cords vs. doing remote PC control.

You still need a decent Internet connection. The Remote Rig interfaces will
**not** correct for packet loss or high jitter (variable latency) Internet
connections. If your round trip delay is much over 150ms, or varies widely
from ping to ping, or if you lose packets, CW in particular will not be
usable. 

The Remote Rigs also have a gazillion parameters and the manuals don't quite
get you there - almost everyone has to resort to the "million monkeys
randomly hitting keys" approach to get everything going. The forums on the
Remote Rig site are very helpful and W1UE in particular has posted a lot of
good K3 guidance.

The K3/Mini has been a big disappointment, especially at the price - I
should have just gotten a bare bones K3. The major problem has been the
audio on both TX and RX when connecting the headset to the Mini (vs.
connecting to the RemoteRig). On TX, I get loud hum and on RX, the audio is
20db down compared to the audio coming out of the RemoteRig.

I sent the Mini back, Elecraft sent it back saying it worked fine. (They
didn't even contact me, which I objected to and they are fixing that problem
in their process.) On RX, apparently that audio loss is due to a filter that
was put in to deal with digital noise getting in the audio, but running the
AF gain at 90% on the Mini is not acceptable to me - distortion up and no
head room for low signals or turning off AGC, etc.

So, I have to connect the headset to the RemoteRig, then audio is fine - but
the cabling is less convenient and messy. Part of the reason I justified
spending the $700 was to be able to essentially use the Mini just like I
would a "real" K3, but I can't do that. I may bring along the Mini and
Remote Rig set up on travel some day if I keep the Mini - that portability
is about the only reason to keep it.

Others have had the same audio issues, others just naturally connect their
headset to the RemoteRig, others have had no problems with the Mini - your
mileage may vary. 

73 John K3TN



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