[TenTec] Omni D issue

[Dr. Gerald N. Johnson]

Its not the flux capacitor. Those are only part of science fiction star 
ships.

It can be band dependent. If its on 18 MHz it could be that using the 
low side injection crystal is causing the the second harmonic of the LO 
to leak through the mixer and make a spur. So with very low output (e.g. 
by reducing the mike gain) you have only one signal from the LO leakage, 
but when you turn up the mic gain you have two and that confuses the 
tuner because it can't tune with two input signals half a MHz apart.

Sometimes in a radio VOX circuit the BOX delay capacitor gathers charge 
from audio input while the PTT is held and that delays release of the TR 
relay. Could be the relay.

SWR measurement is dependent on their being only one signal to the SWR 
meter, not two or more so a radio with a spurious output like the Omni D 
has on 18 with the low side injection crystal.

73, Jerry, K0CQ

On 9/10/2010 5:43 PM, tubsc66 at aol.com wrote:
> Hello everyone, my Omni D has developed an issue that puzzles me (not
> hard to do...:), it has developed a high-swr issue that none of my
> other rigs have (I have other TT's and riceboxes), same antenna,
> autotuner and feedline. The autotuner is unable to find a match
> unless the output is very low. When releasing the mic (PTT),  there
> is a delay in the receive signal coming back to full strength, it is
> accompanied by a "click", which must be the T/R relay sticking. Could
> the relay cause such an issue? I thought swr issues were dependant on
> the antenna, not the radio. Anyway, I'd like to fix it, any thoughts
> out there? Thanks!
>
> 73's
>
> Chris  KC5IIE
>
>