Paul, Here is my two cents worth. I am not sure what you are using for your other equipment in your system, but we use Micor repeaters and have a combination of Motorola Maxtrac, GE MVS, and Johnson Challenger link radios. We always enable PL encode and decode with reverse burst on the repeaters and both ends of the links. No squelch crash anywhere in the system. I have to listen very closely to tell if the user is coming in on the link receiver or the local repeater that I am listening to.
If you have commercial PL encoders/decoders that are capable you might want to enable reverse burst throughout your system, and give that a try first. Our repeaters are in PL access with the "AND" Squelch mod. We run the link radios in PL mode and strap the mic hangup button to ground. We feed the controllers COR signal only. We do not let the controllers control any part of the PL. If you have any open COR only repeaters in your system, you will still hear a squelch burst when someone is using that repeater. Good Luck, Joe - WA7JAW --- In [email protected], N1BUG <p...@...> wrote: > > Thanks Don. > > Yep, I was over-thinking the problem! Links are new to me. Somehow I > was forgetting I have control over keeping the link transmitter up > after I drop the PL tone, so I can eliminate squelch crashes at the > receive end of the link that way. All I need to do is ground that > trusty pin (P701) on the Micor encoder, and possibly tweak some > timer settings in the repeater/link controller. I was also > forgetting I can force messages (ID) to start some specified time > after I drop the PL tone and before the transmitter drops. > > I may be able to control P701 directly from an output on the RLC-4 > controller. Needs some research. I'm not sure I understand exactly > how some of the event triggers (029-044) work (or rather exactly > what triggers them) but I will ask and/or figure it out. > > Paul N1BUG > > > Don Kupferschmidt wrote: > > There was an earlier post concerning grounding a pin on the backplane which > > instantly disables the PL tone on the transmitter. I've got a VHF unified > > chassis MICOR which is controlled by an SCOM 7K controller. I used one of > > the digital outputs of the controller and tied it directly to the PL > > disable > > connection on the backplane. > > > > Then, I programmed a macro which was tied to a command function to have the > > line go low 1 or 2 seconds just before the transmitter shuts down. I works > > flawlessly. I don't have the manual or the code in front of me, but if > > anyone is interested in this I can provide details. Obviously you would > > need either a controller or some type of interface to accomplish this. > > > > 73, > > > > Don, KD9PT >
