Strange problem when switching modes from VFO A to B

[Jack Colson]

I have VFO A programmed for CW on each band, VFO B programmed for SSB
(makes no difference which sideband ).  Power up the K3 on VFO A then
switch over to VFO B and the signal generated is extremely distorted and
sounds like it is being transmitted via a very narrow filter.  To
correct this problem simply switch the mode from L or USB to CW and back
again to L or USB.  Audio is then restored to normal.  I have the
filters programmed correctly, the 2.7KHz filter is used for transmit.  I
am using the ESSB mode with a 4 KHz filter.  This problem is independent
of band.

I mentioned this to Gary who passed it onto Lyle and who was unable to
make it happen.  I am using firmware 2.38 DSP 1.92.  I am waiting for an
update which will fix the turn on audio spike before updating.

Any suggestions ?  It is just a nuisance getting a report of who is that
calling!!!

73,
Jack, W3TMZ

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[Don Wilhelm-4]

Jack,

I don't know if it is relevant to your problem, but if you have ESSB
mode set on, the transmit filter must be the 6 kHz filter instead of the
2.7 kHz.

73,
Don W3FPR

Jack Colson wrote:

> I have VFO A programmed for CW on each band, VFO B programmed for SSB
> (makes no difference which sideband ).  Power up the K3 on VFO A then
> switch over to VFO B and the signal generated is extremely distorted
> and sounds like it is being transmitted via a very narrow filter.  To
> correct this problem simply switch the mode from L or USB to CW and
> back again to L or USB.  Audio is then restored to normal.  I have the
> filters programmed correctly, the 2.7KHz filter is used for transmit.  
> I am using the ESSB mode with a 4 KHz filter.  This problem is
> independent of band.
>
> I mentioned this to Gary who passed it onto Lyle and who was unable to
> make it happen.  I am using firmware 2.38 DSP 1.92.  I am waiting for
> an update which will fix the turn on audio spike before updating.
>
> Any suggestions ?  It is just a nuisance getting a report of who is
> that calling!!!
>
> 73,
> Jack, W3TMZ
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[Dick Housden, W0NTA]

Jack,

You are correct. I have had the reports of pinched audio and just cycle to another band and back or switch sidebands and back and everything is OK.

I have duplicated what you report:

VFO A on CW and VFO B on SSB.

Turn off K3 while on VFO A - CW.

Turn it back on and immediately switch to VFO B - SSB and the audio is terrible.

Cycle to other sideband and back and all is well again.

This only happens to me on 40, 80, and 160 meters. Other bands are unaffected. Each time I have had a report of bad audio, it was on 40 meters. Rarely operate 80 or 160 meters.

I am glad to find out how to get around this problem. I hope something can be done with programming to fix it, though.

73, Dick, W0NTA

Jack Colson wrote

I have VFO A programmed for CW on each band, VFO B programmed for SSB
(makes no difference which sideband ).  Power up the K3 on VFO A then
switch over to VFO B and the signal generated is extremely distorted and
sounds like it is being transmitted via a very narrow filter.  To
correct this problem simply switch the mode from L or USB to CW and back
again to L or USB.  Audio is then restored to normal.  I have the
filters programmed correctly, the 2.7KHz filter is used for transmit.  I
am using the ESSB mode with a 4 KHz filter.  This problem is independent
of band.

I mentioned this to Gary who passed it onto Lyle and who was unable to
make it happen.  I am using firmware 2.38 DSP 1.92.  I am waiting for an
update which will fix the turn on audio spike before updating.

Any suggestions ?  It is just a nuisance getting a report of who is that
calling!!!

73,
Jack, W3TMZ

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[wayne burdick]

I've read all the mail on this and will try to duplicate it (and fix
it). Thanks for the input.

73,
Wayne
N6KR

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[Roger Marrotte-2]

Wayne,

I think I've seen something similar happen to my K3 a handful of times while
I was using the LP-PAN/Power SDR combination to rapidly scroll through
frequencies using the mouse wheel.  It seems as if the frequencies change
too fast for the K3 to keep up and somehow the radio is left in the wrong
state.  It sounds to me as if the wrong filters are left on (pinched
audio?).  A power cycle has always fixed the problem.

Roger, W1EM

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of wayne burdick
Sent: Monday, December 15, 2008 11:17 AM
To: Elecraft Reflector
Subject: [Elecraft] Re: Strange problem when switching modes from VFO A to B

I've read all the mail on this and will try to duplicate it (and fix it).
Thanks for the input.

73,
Wayne
N6KR


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