[Elecraft] Strange problem when switching modes from VFO A to B

[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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