[GreenKeys] TTY driver software?

[hwhall at compuserve.com]

 I'm the person who started the thread, and throwing together a circuit is not a problem.  I'm rummaging around now to see what old PC I can resurrect to run the teletype testing with, but another old radio project has been handed to me for restoration, so I may not make a lot of headway with the teletype for a bit.

It was my assumption that it would be easier to find a program that would key an output line instead of a program that would output RTTY tones.  Perhaps that was incorrect?  I was also thinking a nice squared up switching signal would be one less "iffy" thing to wonder about when observing the teletype while running a test.  And maybe a tone demodulator is more reliable than I worried about.

 

 Wayne
WB4OGM 


-----Original Message-----
From: Ralph Mowery <rmowery28146 at earthlink.net>
To: GreenKeys <GreenKeys at mailman.qth.net>
Sent: Tue, Apr 10, 2018 8:08 am
Subject: Re: [GreenKeys] TTY driver software?

As there is probably going to be some level shifting circuits  to be
obtained, one question is can the person wanting to do this build very
simple circuits ?

If so, many of the sound card programs will let you  send a file.  Just get
a demodulator of about any type or build up a very simple circuit to do
this.  I bet if you set the tones very wide a simple torroid coil and
capacitor to resonate at the mark tone  and driving one of the higher gain
fets or mosfets would work like the old one tube demodulator of years past.
To this, one of the simple inexpensive boost converters, a  power resistor
and a 9 to 20 volt wall cube could be used.

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