[TenTec] Omni VI & SignaLink USB

[Richard Gerardi]

Hi bob,

With my Omni VI, I bypass the front mic jack altogether and do everything
from the back. I use a little Bucscomm Rascal for digital interface. I have
a balanced mic through a mixer. I noticed that my mic audio looked a little
"rougher" on the monitor scope when they were both connected in the back at
the same time. For the mixer output, I built an line level isolation with
pad audio box using a 600:600 audio transformer and a pot. I think my
Bucsomm has an isolation xfmr in it as well. With both connected into the
Audio In RCA jack using a Y adapter in the back I get no interaction
between the two at all now. Interested to see what Tigertronics uses for
it's isolation.

Rich
AA6VX
18 more days until I get my Omni VII and counting down....


On Thu, Jul 10, 2014 at 5:45 AM, Bob McGraw - K4TAX <RMcGraw at blomand.net>
wrote:

> I'm trying to assist a friend setting up his Omni VI with a SignaLink USB.
>  He does have the cable supplied from SignaLink and it seems to be
> connected to the radio correctly.  It receives and decodes PSK-31 very
> satisfactorily and it keys the transmitter correctly.
>
> The difficulty is having both the SignaLink connected to the Audio IN on
> the rear and the microphone connected to the front at the same time.  The
> SignaLink appears to key the radio correctly but does not produce output.
>  When he then later and on a different frequency tries to transmit SSB only
> white noise is heard.  If he unplugs the cable to/from the SignaLink the
> noise is not heard. This occurs when the SignaLink is off or on.
>
> It appears from the schematic the mike input on the front and the rear
> Audio In are each isolated by a 10K series resistor to a summing point at
> the mike amp input.  Using a low impedance {500 ohm} dynamic mike and the
> SignaLink output being some 600 ohms, I calculate the isolation between the
> two inputs would be some 35 dB or so. Certainly this would seem to be very
> adequate isolation such that having the two connected, although the
> SignaLink is off, it would not interfere with the use of the mike.  And
> with the SignaLink on it would produce audio and it would not be interfered
> with the connected mike.
>
> Anyone have any specific experience or thoughts on this configuration?
>
> 73
> Bob, K4TAX
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>



-- 
Richard Gerardi
North Santa Barbara County ARES
Satellite Amateur Radio Club, W6AB
aa6vx at arrl.net