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To: JRandomFreeper

Could you hook up a 110 baud teletype to it?


43 posted on 07/07/2012 10:08:45 PM PDT by Jack Hydrazine (It's the end of the world as we know it and I feel fine!)
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To: Jack Hydrazine
No, but I have other radios and a PK-232MBX that can fake a 110 baud TTY. Take me a while to dig out the serial converter and remember how to make a linux terminal window talk to it.

I dislike SSB and AM since I'm hard of hearing now.

Spark gap is pretty much CW only. And unlawful these days.

/johnny

49 posted on 07/07/2012 10:15:59 PM PDT by JRandomFreeper (Gone Galt)
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To: Jack Hydrazine
Could you hook up a 110 baud teletype to it?

I hacked together a tty demodulator using some old 88 mH toroids and surplus caps. A boat anchor HP signal generator, old frequency counter and crappy old Heathkit scope provided the means to tune the coil/cap combos. I made a "ratio" detector from those parts that could key my old 160 mA loop using nothing but the audio coming from the speaker output of my old Yaesu FT221. The model 15 teletype I had refurbished was happy to capture the single strike art that Don Royer (WA6PIR) would put out on a Thursday night.

I'm still quite capable of designing that kind of gear from scratch. As long as I have a modern computer, I can do most of that modulation/demodulation of the sound card alone. There are great open source software defined radio packages available on the net. In a pinch, psk31 works a bit better than the old 170 Hz shift AFSK for simple "chat" over the air.

It appears Don Royer is a silent key now. His RTTY art work is still available via archives on the net.

103 posted on 07/08/2012 12:27:07 AM PDT by Myrddin
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