[GreenKeys] GKN QSOs

[Harold Hallikainen]

Great reading all this stuff! I don't have any RTTY hardware right now
(did 50 years ago), so I'll just listen on the KiwiSDR at
http://radiomarine.org/ .

Back then, I ran 850 Hz shift and 170 Hz was just starting to be used. I
seem to remember 3.625 MHz as a common RTTY frequency. I used that and
something on 40 meters.

On the use of LSB when generating using AFSK, I remember "LSMFT" or Low
Spac Makes Fine Teletype." Back then the AFSK tones were 2125 and 2975 Hz
with mark being on the lower frequency, and an LSB transmitter would
invert these to transmit LSMFT.

On autostart, I did some autostart RTTY on the local 2 meter repeater when
I was in college. In high school, I ran a single wire about a mile to a
friend's house. We put a model 15 at each end and ran a 60 mA current loop
against ground. We added a relay with time delay in the loop. We each had
a power supply so we could supply loop current. Either of us could start
both machines by supplying loop current. When we were done, we'd shut down
the loop current. Both machines would "run open" for a second, then shut
down.

So, I look forward to watching you guys on the SDR!

Harold


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