A92: RE: A Radio Link idea
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A92: RE: A Radio Link idea
>Date: Thu, 16 Sep 1999 21:20:51 EDT
>From: TurboSoft@aol.com
>Subject: A92: A Radio Link idea
>
>this may be impossible to work the way l state this, but...
>FM radio transmitters can be bought cheaply (l think) at Radio shack >or a
>place like that. l know that headphone adapters (headphones -> link >port)
>can be bought there for $3.00
>Now, what would happen if you connected up an FM transmitter to a >walkman
>and
>all together to a calc, and did the same thing on the other >calc...would
>it
>work like a link cable or just feedback and not work?
It is a good idea, but it wouldn't quite work correctly, the calc puts out
5 volts for a data signal, a microphone puts out like 200mv (i think) .
You need something similar to a modem also. you can not here (clean) DC
over a speaker, it has to be AC. In ham radio we do seomthing very similar
to what you are talking about, and infact, I have used it with my 92. It
is called a TNC, Terminal Node Controller, it takes the data given it
through a serial port from a computer running terminal emulation software,
waits until it gets a carriage return, and then compresses it and sends it
as a packet. Thus useing less air time, standard speed is 1200 baud. And
it will plug into any transceiver that has a standard, speaker and
Microphone jack. E-mail me if you have any more questions.
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