[lug] [OT] Old Stuff

[Nate Duehr]

Kenneth D. Weinert wrote:

> I can't imagine a use for these, but can anyone think of a reason to 
> *not* throw out a Hayes 2400 and an Intel 144e modem?

*IF* the 2400 has the real clicky-click type RELAY in it, there's some 
interesting applications for that in the radio world...

(The relay closes the "line two" pins together on the RJ11 on the back 
of the modem whenever it's off-hook, and allows for keying a radio 
whenever the modem is told to go "off-hook"... for purposes of sending 
DTMF commands to remote radio sites.)

Heh... but that's pretty esoteric.  And I think the 1200 was the last 
modem that did it.  I don't think the 2400 did.

The original Hayes 1200 baud modems also had a "hidden" AT command to 
send Morse Code via a switched single AF tone... so mixed with the 
above, a PC, the modem, and a cable to the radio were all one needed to 
remotely transmit and program something via DTMF over a radio link, and 
also to legally ID the transmitting station!

Heh... sorry... way out of left field, I know.  I was hunting for a 
Hayes 1200 earlier this year to hook up to do this, and then realized 
that most of them are so old their power supply and filter capacitors 
are completely dried out, and the first power spike they take, they 
usually croak... too much work.

Easier to just use my existing sound-card interface, generate DTMF there 
which keys the radio via VOX, and plug in a mic to ID it when I'm done.  :-)

Nate