KX3 / NaP3 Question

[Jim Bennett]

I'm running NAp3 v2.2.4.2 on Windows 8.1, connected to the RX I/Q port on my KX3 at one end and to the Line In jack on an iMac on the other end. As some other folks have seen, there is an initial issue with "images" or "duplicated" signals when NaP3 starts up. Ken (W0CZ) tipped me to a way to get rid of the image issue by opening the NaP3 Config panel, going to the DSP tab, and then doing a "Calibrate". This works quite well and just about completely eliminates those images. However........

When I key the KX3, I see my own signal (quite strong) on the NaP3 display and this completely throws out the calibration, bringing back the images, big time. I have tried several things to eliminate this: First, I tried using a PTT switch with the KX3 instead of QSK - I still see my signal on the pan display. Then, I pressed XMIT on the KX3 prior to keying it - no change, still see my signal. Next, I built an audio isolator to put in the line between the KX3 and the Line In jack on the iMac. No change. Finally, I wound the cable through a 2.4" mix 31 ferrite core nine times, thinking that maybe RF was somehow getting things hosed. That didn't help.

So, my questions are: why am I seeing my signal from the KX3 RX I/Q when I transmit? Shouldn't that line be cut off completely when the KX3 goes into transmit? If not, can this be changed so it does? :-)

Jim / W6JHB


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[k5oai]

Hi Jim,
I'm running NaP3 v2.8.8 on Win7 Pro 64bit with my K3, so this may not be
applicable, but it could be worth a try.

In the NaP3 help file under the Menu/DSP contents
where it tells you how to do the calibrate that you have previously
done. It also tells you how after you have done your calibration you can
then set the WBIR to *Manual*. Try that, I believe it will force NaP3 to
maintain the preset *Manual* levels even after the changes during transmit.

hope it works for you

--
GB & 73
K5OAI
Sam Morgan


On 3/20/2014 12:30 PM, Jim Bennett wrote:

> I'm running NAp3 v2.2.4.2 on Windows 8.1, connected to the RX I/Q
> port on my KX3 at one end and to the Line In jack on an iMac on the
> other end. As some other folks have seen, there is an initial issue
> with "images" or "duplicated" signals when NaP3 starts up. Ken (W0CZ)
> tipped me to a way to get rid of the image issue by opening the NaP3
> Config panel, going to the DSP tab, and then doing a "Calibrate".
> This works quite well and just about completely eliminates those
> images. However........
>
> When I key the KX3, I see my own signal (quite strong) on the NaP3
> display and this completely throws out the calibration, bringing back
> the images, big time. I have tried several things to eliminate this:
> First, I tried using a PTT switch with the KX3 instead of QSK - I
> still see my signal on the pan display. Then, I pressed XMIT on the
> KX3 prior to keying it - no change, still see my signal. Next, I
> built an audio isolator to put in the line between the KX3 and the
> Line In jack on the iMac. No change. Finally, I wound the cable
> through a 2.4" mix 31 ferrite core nine times, thinking that maybe RF
> was somehow getting things hosed. That didn't help.
>
> So, my questions are: why am I seeing my signal from the KX3 RX I/Q
> when I transmit? Shouldn't that line be cut off completely when the
> KX3 goes into transmit? If not, can this be changed so it does? :-)
>
> Jim / W6JHB

--
GB & 73
K5OAI
Sam Morgan
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[tomb18]

Hi 
That's interesting. In principle the automatic Iq  routines should just handle this IF the signal is on the Iq signal itself since it would also have an image and thus the routines would just suppress it. Since it doesn't perhaps the signal is just getting into the sound card and thus NaP3 just tries to balance it and that screws up the current calibration. 
Here's a test.  See if you see a signal with the Iq lines disconnected. If you do then having something that turns off the  KX3 s Iq will do nothing. 
Therefore it would have to be handled somehow by NaP3. Probably the best way would be to have a threshold where if the, signal was above this, then it would not be considered in the calculations. 
That is preferable to turning off the auto balance since the correction is frequency dependent. 
73s Tom 




-------- Original message --------
From: Jim Bennett <[hidden email]>
Date: 20/03/2014  13:30  (GMT-05:00)
To: Elecraft Reflector Reflector <[hidden email]>
Subject: [Elecraft] KX3 / NaP3 Question
 

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[Jim Bennett]

OK - just pulled the IQ line out of the back of the iMac. Nothing showing on the pan display, even when I key the KX3, so this signal is for sure coming across that line from the KX3.

It's strange how the WBIR stuff is working, too. I tried setting it to "Fixed" after doing a Calibrate. If I then key the KX3 the images re-appear. By clicking the Fixed and changing it to Running and then back to Fixed, the duplicate signals go away. Until I key the KX3 again. Somehow that signal from the KX3 needs to be stopped! Arrghhhh!!!!

Jim

On   Thursday, Mar 20, 2014, at  Thursday, 11:18 AM, Tom wrote:

> Hi
> That's interesting. In principle the automatic Iq  routines should just handle this IF the signal is on the Iq signal itself since it would also have an image and thus the routines would just suppress it. Since it doesn't perhaps the signal is just getting into the sound card and thus NaP3 just tries to balance it and that screws up the current calibration.
> Here's a test.  See if you see a signal with the Iq lines disconnected. If you do then having something that turns off the  KX3 s Iq will do nothing.
> Therefore it would have to be handled somehow by NaP3. Probably the best way would be to have a threshold where if the, signal was above this, then it would not be considered in the calculations.
> That is preferable to turning off the auto balance since the correction is frequency dependent.
> 73s Tom
>
>
>
>
> -------- Original message --------
> From: Jim Bennett <[hidden email]>
> Date: 20/03/2014  13:30  (GMT-05:00)
> To: Elecraft Reflector Reflector <[hidden email]>
> Subject: [Elecraft] KX3 / NaP3 Question
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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[Phil Wheeler-2]

Computers have sure complicated our hobby, Jim.

Never such issues with my good, old K2.  So far
I've not ventured into that realm with my K3 nor
KX3, except for the Elecraft utilities. But my day
of computer grief will soon come, I'm sure ;-)

73, Phil w7ox

On 3/20/14, 11:28 AM, Jim Bennett wrote:
> OK - just pulled the IQ line out of the back of the iMac. Nothing showing on the pan display, even when I key the KX3, so this signal is for sure coming across that line from the KX3.
>
> It's strange how the WBIR stuff is working, too. I tried setting it to "Fixed" after doing a Calibrate. If I then key the KX3 the images re-appear. By clicking the Fixed and changing it to Running and then back to Fixed, the duplicate signals go away. Until I key the KX3 again. Somehow that signal from the KX3 needs to be stopped! Arrghhhh!!!!
>
> Jim
>

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