Jim,
Buck changed the interface in the Rascal from an opto isolator to the
current FET. I have a couple of Rascals with the opto interface. I have had
no problem driving my Omni VI (opt 3) in FSK mode with them. I don't think
I've used MMTTY, but I did use WriteLog to participate in one of last
winter's RTTY contests. I wasn't getting reports of being upside down, so I
think it was working okay.
I don't know why Buck changed to the FET from the opto, but on a friend's
setup, that created ground loop hum in his TX audio.
I wasn't using Buck's cable. I had a cable with a 5-pin DIN and 4 phono
plugs that works just fine.
73,
Mark
----- Original Message -----
From: "Jim" <jlboockh@earthlink.net>
To: <TenTec@contesting.com>; <w1mag@bellatlantic.net>;
<bill.w7tvf@air-internet.com>
Sent: Thursday, September 25, 2003 12:17 AM
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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>
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