[TenTec] Omni V Mic Gain

[jellis]

David,

I would check to make sure the vox, the anti-vox
and the processor are working as they are all
involved with the audio input. Any improper
operation there might steer you to the mic gain
problem.

I would also check to make sure you don't have
a low impedance device plugged into the aux
audio input. Also, those RCA jacks on the back
come loose from the board quite easily, and it's
possible it may be shorting out. The mic jack and
external audio are in parallel, save for decoupling
by a 22K resistor and a 0.1uf cap.

If you have the FM adapter board installed, you
might remove that to see if it might be loading
something down.

Also, check D16 & D17, and especially D18 and D19.

I have an Omni V and a Paragon (they both use
the same board) and I run my mic gain at about 9:30
with the 705 and perhaps 12:00 with the Heil elements.

As a last resort, you might try replacing U3 or U4,
but before you do, find someone with a Hakko 808
desoldering iron. It makes the job A WHOLE LOT
EASIER! The traces will lift easily if you apply too
much heat.

Good luck,
John, NP2B


David Drake wrote:

> I have an Omni V and run a TT 705 mic with it.  I have to run the mic gain with that mic at about 1-2:00 to get proper tx audio out.  I also have a heil hm10/hc5.  After getting the cable and connectors set up and the mic plugged in, I had to run the mic gain wide open to get any, repeat any decent audio out.
>
> Is there a mod to the TX audio board that will give me more mic gain?  I called TT and they said what I have is all I can get.  (called on this twice-basically same answer).  I refuse to accept that until further convinced.
>
> I guess the thing that keeps sticking in my craw, is that with my older corsair and omni C, I ran the gain at about 10:00 for proper alc action and both worked fine with several mics.  Those radios had plenty of gain available.
>
> Any mod ideas would be appreciated.  Rather not reinvent the wheel, so to speak.
>
> David Drake, Wd9cmd
>
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--
Jeanette and John Ellis (NP2C & NP2B)
P.O. Box 24492 Gallows Bay Station
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