> Brian <[EMAIL PROTECTED]> wrote: > Hey > My first controller consisted of a transistor and resistor > connected to one of the terminals on the squelch pot of a > old crystal Regency radio for RX to TX PPT signal. I had > a cap between the audio out of the RX radio to the mike input > of the TX radio. > Hey, it worked...
... and remains a viable way to make a "poor mans repeater interface". Not to mention it's cheap and fairly easy to construct. > It didn't have a lot of range without a duplexer though :) Probably the fault of the receiver front end... or lack there of. > The next controller I built used a Vic20 (remember those, still > have some). I see a twinkle in your eye... > There was a board with an eprom on it that went into the > 22/44 connector. The program on the eprom started > automatically. There was a second board that had a 555 > timer and a PPT transistor on it. I figured as there > was only going to be a few made I used the 555 instead > of creating the cw audio with an interrupt (more parts > but less work). A smart and innovative guy... > If I wanted a timer time change or something I just got > out the disk drive and monitor and burned the new values > on the Eprom. > > I made one for myself and one for a friend of mine. He ran > his for over 10 years until I provided him with another > single board prototype which he has been running for > over 8 years. Although he hasn't had to use it he has > kept the VIC20 as a backup. You could play video games at the repeater site. One of the main simulcast system alignment computers used by our CHP had a few dos games on it... > The DTMF control came from a second board. It was a DTMF > decoder that had 10 outputs. It was designed before the > VIC20 controller. It used a CD4067 and a SSI 204 to latch > / unlatch and pulse outputs. The output transistors were > MPSA13's. All the pulsing and latching / unlatching features > were one DTMF digit long. I made two of these almost 20 > years ago. One is still in use and the other is sitting > on my shelf. Three guys on this Group for the next 30 seconds are wondering where they put their old Vic 20 computers... > I have always had fun building repeaters and the controllers. > 73 > Brian > ka9pmm What it's all about Brian, cheers, s.
