[TenTec] TR problem with Omni-V

[Dr. Gerald N. Johnson]

On Sat, 2008-05-03 at 20:09 -0400, Ralph Matheny wrote:
> Last summer I posted here a description of a problem with my Omni-V: 
> Sometimes it fails to return to RX at full sensitivity after a 
> transmission.  I received a number of responses, all advising that I 
> needed to replace the reed relay on the PA filter board which puts the RX 
> back in the system.  I got the relay, and last nite I finally got around 
> to opening the Omni and doing the job.--SURPRISE!  NO RELAY in the 
> circuit, despite the drawings in the manual.  Instead there are a couple 
> 1n4007 diodes (used as PIN diodes, I assume) and a few other parts.  Does 
> anybody have experience with this configuration??  Getting to the board 
> isn't too bad, but I want a "total" fix as I use the radio in my 
> mobile/rover contest operations and want to be sure.
> 
> Will probably buzz TT service after this week, but advice from here is
> usually on target!!
> 
> Ralph Matheny
> K8RYU
> 207 Gibbons Place
> Marietta Ohio  45750
> mathenyr at marietta.edu
> 
> 
> 
Is there a switch on the back to select receiver on the transmit antenna
or separate? In some Tentecs that switch has caused exactly your
symptoms. Contacts need cleaning. A part drop of DeoxIT helps, as does
vigorous operation.

Otherwise connectors carrying RF or control DC are suspect as well as
board solder connections (and board grounds through mounting screws).
1N4007 are too expensive (NOT!!!) to replace as a test. Maybe a nickel
each. Maybe less in sacks of 100. Might even be at your local Radio
Shack at a quarter each.

73, Jerry, K0CQ