[TenTec] Using Omni VI+ woth MMTTY on FSK - final report

[Dave W7DPW]

Jim,

Glad you got it going.  See you on the RTTY bands during contest
times.

Dave W7DPW

----- Original Message ----- 
From: "Jim" <jlboockh at earthlink.net>
To: <TenTec at contesting.com>; <w1mag at bellatlantic.net>;
<bill.w7tvf at air-internet.com>
Sent: Wednesday, September 24, 2003 9:17 PM
Subject: [TenTec] Using Omni VI+ woth MMTTY on FSK - final report


> Thanks to help I received on the Ten Tec reflector and on the Yahoo
> MMTTY Group, I now have my Omni VI+ working properly on FSK using
MMTTY.
>
> It seems that the interface circuits suggested by AA5AU, K4ABT, and
> others, work on RTTY with the Omni V/VI but reverse the signal. I
> bypassed the transistors in the interface circuits with a 10K
resistor.
> This feeds the DB-9 pin 3 FSK signal from MMTTY directly into the
> Mark/Space jack on the Omni VI. (On the Omni V this jack is labeled
RTTY
> KEY.) It works like a champ.
>
> Another option is to add a second transistor, resulting in a
two-stage
> interface. One very helpful peron reported using this successfully
with
> a Rigblaster.
>
> The Rascal interface sold by Buck K4ABT does not work as he sells
it. I
> had to modify his Omni VI cable by adding an FSK line. I also had to
> bypass the FET in the Rascal's FSK interface with a 10K resistor.
Now,
> unlike the AA5AU circuit, it provides not only an FSK signal but an
> audio signal for PSK31. Buck's email responses to me sounded like he
is
> not familiar with the Omni V/VI. (His interface and cables worked
fine
> on AFSK.)
>
> Thanks for all the help. Listen for me this weekend on the CQWW RTTY
> contest.
>
> Jim  N4AL
>
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