[GreenKeys] Getting RTTY on the air

[Harold Hallikainen]

I've finished connecting my model 15 to the TU-170 to my radio (
https://w6iwi.org/SEA245/ ). I added an audio transformer and a reed relay
to the TU-170 to drive the SEA245 tri-state audio bus. For testing, I'm
trying to get the RTTY decoder on a KiwiSDR ( http://rx.linkfanel.net/ )
to decode my signal. So, here are some questions.

1. I remember from MANY years ago, that LSMFT, or Low Space Makes Fine
Teletype. That, as I recall, is on RF, and it's reversed on AFSK. So, the
TU-170 uses 2.125 kHz for mark and shifts up 170 Hz for space. That
indicates that the transceiver should be set for LSB to get the signal
right side up. Is this correct?

2. How is the transmit frequency normally specified? I can think of
several ways:

a - Mark frequency
b - Center frequency (Mark frequency minus 135 Hz)
c - LSB "carrier frequency" (Mark frequency + 2.125 kHz

Is one of these correct? If so, which one?

3. What are common frequencies on the HF bands for RTTY? From many years
ago, I think I remember 3.635 MHz for the mark frequency.

4. Anything special in the FSK settings on a KiwiSDR? Should the signal be
inverted?

THANKS!

Harold



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