> > You can do a real simple repeater controller using some > > 555/556 timing chips in monostable mode.Look at any Forest > > Mimms 555 cookbooks. He did quite a few decent circuits.
The 555 circuits decribed in a lot of those books are "ok" but the best use of the 555 operation using all the internal functions is most often over looked. The original Hamtronics COR-2 circuit was the only well done 555 type circuit I've seen that takes advantage of most every available 555 internal function. It normally takes two 555 timer chips for a basic cor function. One timer is set up to add tx tail/hang time and the other to ensure the exceeded tx time-out time function shuts the transmitter down. A lot of people get cheap and replace the tail timer with a resistor cap method, which is not nearly as cool as a well done 555 circuit. > > As for the ID timer requirement, You can get any 1200 packet > > TNC that has morse code ID that you can program with a laptop. Kind of neat idea... if you can pull it off. >From the circuit it's pretty easy to use cor board logic activity to generate an output pluse, which triggers whatever ID'er function/circuit you use. A resistor and a cap make good id'er trigger pulses. > > Some good TNCs even have a hardware/software Carrier > > operated Switch included. Ahhh... time to break out the assmebler and rewrite the tnc software to make it a repeater controller. Not.... actually, wouldn't that be pretty funny if someone did. > > Maybe you can tell us what you want, unless you want a > > real challenge like a tube repeater controler ? "Pre-Progress Line or Research Line..? " Tube repeaters are pretty much done. especially if you're paying the site power bill. cheers, skipp
