[TenTec] Paragon RTTY (FSK)

[Vic Klein]

You are right, I had forgotten that I used a pull-up resistor and the 12vdc
jack to allow keying the Paragon via the FSK connections. I also run a small
fan when running extended RTTY.

If I can shift the KAM on what it is listening for on the received tones,
that would likely fix the apparant offset I have. Since I am keying the
radio on FSK on transmit, shifting the audio output of the KAM would have no
effect, of course. Otherwise, my suspicion that I need to adjust the BFOs is
probably the route to go. Adjusting USB/LSB is easily accomplished without a
counter by listening to a received carrier with a modulated tone, as WWV
does during certain periods. You can tweak the USB/LSB BFOs to not shift the
audio from what you hear on AM and have all on frequency that way. Alas, I
don't see how to do that with RTTY.

=Vic=
WA4THR
----------------------------------------------------------------------------
---------------
To:  Discussion of Ten-Tec Equipment <tentec at contesting.com>
Subject:
From:  Bwana Bob <wb2vuf at qsl.net>
Reply-to:  wb2vuf at qsl.net,Discussion of Ten-Tec Equipment
<tentec at contesting.com>
Date:  Thu, 06 Apr 2006 20:55:16 -0400
List-post:  <mailto:tentec at contesting.com>

I use exactly the same setup here: an old KAM and the Paragon. I did
have to put a pull-up resistor on the mark/space input to make it work
properly. I also use fans on the XCVR and power supply when running RTTY.

If the receiver or Passband tuning isn't centered right, you will have
to tweak the BFO trimmers. They can change with age, and the rotor
wipers may get a little tarnished, causing frequency shifts. Contact
cleaner and a few rotations of the cap fixed this for me. There is
probably a clever way to adjust the frequencies without a counter.


                73,

                        Bob WB2VUF