Thanks Barry.. I am not having rig control issues and thus dont need to use
LP-bridge at this time.
This seems specific to the IQ audio coming out of the IQ out of the KX3. I
have experienced this on 2 KX3's and multiple sound card/computer combinations
so I suspect an internal setting or something I have not found documented or
missed. Since the PX3 is in existence.. there must be some setting/combo that
fixes the spectral display as it is fed to a high end sound card.
and again I did not have this issue with the N8LP pan or the IF out of my K3's.
This is specific to the IQ out feature of the K X 3.
If you read further you will find I did solve some of the computer RFI with a
GLI.. in particular from radio shack. This seems to be required hardware at
this point and needs to be put in line with the IQ out cable provided by
elecraft. With it in line it is no longer a problem.
Thanks for the tip on Win4k3 Ill give that one a shot.
~C./WM
________________________________________
From: Elecraft [elecraft-boun...@mailman.qth.net] on behalf of Barry LaZar
[k3...@comcast.net]
Sent: Saturday, December 20, 2014 12:42 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft KX3 IQ out and spectral display pograms
Chris.
I have switched over to Win4K3. It's a total package with spectrum
display, IP connection to HRD, works well with CWskimmer, and now there
is spotting and a log program, albeit the logging function is still
being worked on. It seems to run much more smoothly than NaP3 with LP
Bridge.
From reading your post I suggest that you get a Radio Shack ground
loop isolator. It seemed to fix a number of things in my set up and they
are inexpensive. One my overcome some, if not all, your issues.
73,
Barry
K3NDM
On 12/20/2014 2:13 PM, Chris Tate - N6WM wrote:
> Greetings and happy holidays Elecraft enthusiasts.
>
> I have been putting together a portable contest/dx station using a
> KX3/KXPA100 combo. What a wonderful little setup. As part of my testing
> process, I have setup a laptop computer for rig control. This works great in
> alot of respects, Cat control.. no problem. Keying cw from the computer..
> no problem. I have run into a tiny issue, regarding the IQ out and how it
> integrates with computer based spectral display applications and I am hoping
> the fine brain trust of audio experts can help me out.
>
>
> I have a creative EM 0204, and I have split out the IQ stereo into 2 channels
> using a 1/8 stereo to mono a/b splitter, and subsequently feed IQ to the EM
> 0204 into the L/R mono ports. I am having some issues that I have not run
> into.. for instance when I used to do this using an N8LP pan with my K3. (I
> have done sufficient testing with other computers, sound cards to be aware
> this is not limited to just this equipment). here is what my observations
> are:
>
> CW Skimmer. Seems to work.. but the IQ balance seems to fall out of sync
> after being dialed in. in other words from time to time multiple traces of
> signals appear. this after adjusting with a fixed carrier on WWV to remove
> the traces. Its almost as if there is an IQ instability of some kind and I
> was curious what others have found.
>
> PAN displays, NAP3, etc.: there seems to be a rather large artifact that
> tracks with the center frequency making use of the pan display rather
> impractical...maybe 20-30 Kc's or more. I assume this issue is resolved to
> make the PX3 display an accurate spectral representation, and so am
> wondering if there must be a setting or something I have adjusted incorrectly.
>
> I also ran into an audio artifact where I could hear computer rfi through the
> headphones with the IQ cable plugged in.. I was able to mitigate this using
> a ground loop isolation cable.. keeping in mind I want to keep this setup
> portable and useable in remote locations.
>
> IF anyone who may have resolved some of these IQ out issues could chime in
> and assist it would be greatly appreciated. I am trying to make this setup
> as capable and portable as possible.
>
> thanks in advance and look forward to your responses.
>
> Chris
> N6WM
>
>
>
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