--- In [email protected], [EMAIL PROTECTED] wrote: > > At 10/18/2008 08:56, you wrote: > >At 07:32 AM 10/18/2008, John Everson wrote: > > > > >Good morning to the group. > > > > > >I have a situation where I have two repeaters and only one available > > >port. Has anyone tried this? If so, what method did you use, and what > > >were the results? I have done this in the past, but it was a long time > > >ago, and my memory isn't what it used to be. It seemed to work, but > > >back then, I may have not really have been as discriminating as I am > > >today. > > > ><----What kind of "port" are you talking about? Antenna? Controller? > > I assume he's referring to repeater controller ports. > > I believe you can simply tie the PTT & audio out of a single port to 2 > transmitters. Just make sure the open PTT voltage of both transmitters is > roughly the same. If one is 5 volts & the other is 12, the 12 volt source > could damage the 5V PTT line. > > The receivers are a different story, as you'll need some sort of port > combiner to handle the COS & CTCSS logic outputs & audio outputs from the 2 > receivers. I built a 4 port unit that logically ORs all 4 COS lines & > squelch gates/mixes the audio from each receiver. Unfortunately I never > scanned the circuit so I'd have to rummage through my paper files if you're > interested in the schematic. > > Bob NO6B > Thanks for the reply guys. I should have made it more clear. I was talking about having just one repeater port available. It seems that in the past, I used diodes to tie the cos and pl logic signals to the controller port and then combined the audio signals together but that was a long time ago. I would be driving a long way just to fool around with the thing so I think that I'll test something here on the bench before I go back. If I can't make anything work here on the bench, I may take you up on your schematic Bob.
You know, it seems that you always need one more port. If you have two, three would be really handy, four, five would be just the ticket. If I had ten, well maybe not then. Thanks again. John AB6LI
