[TenTec] Ten Tec Omni-D Series B SWR Problem

[Dr. Gerald N. Johnson]

On Fri, 2008-04-18 at 11:58 -0400, Mike wrote:
> Hi Guys
> I Have a Omni-D Series B Transceiver,When I use the radio on 40 and 75 
> meters SSB.I tune antenna to Flat match,And when I talk the Swr Jumps up 
> to 1.3 and 1.5 reflected,On dead key carrier I can get get my antenna to 
> go flat match.It only does this when I talk.I've already changed all the 
> 1N-4048 diodes on the swr board and fixed a low receive problem, and I'm 
> running the drive at 2 to 2 1/2.Any Ideas on how to tame this problem???
> 
> Tnx Mike

Could be you are driving the PA a lot harder on voice than with the tune
up carrier and making harmonics that are reflected by the tuner showing
the voice level dependent SWR. Either that or parasitic oscillations in
the PA...

73, Jerry, K0CQ