Tony,
It's an ACS KPR-6000 machine running on 6.25/.85. The antenna is a 4- bay on top of a water tower... probably 200' AGL, on the north end of Warner Robins. It seems more frequent in the morning hours (0700 or so), but is very intermittant. I believe it happens more during wet weather also, which leads us to believe that it has something to do with the telemetry transmitter at the water tower. (Our repeater is the only antenna on the tower. The telemetry antenna is on a telephone pole, about 25' high. It's a small vertically polarized yagi pointed directly over our repeater shack. I assume it's rather low power and transmits only when necessary. It's definately suspect, but we can't catch the thing burping when we're at the shack!) It's been going on intermittantly for about a year now. I don't think it initiates itself, but waits for an ID or for a user to activate the transmitter, then starts the cycle of kerchunking itself. Sometimes it stops in 3 or 4 cycles, but I've heard it go on for an hour or more. Of course, the whole place is surrounded by chain-link fence, so we've only got about a million metal-to-metal joins that might want to act like diodes at any given time! -- de WM4B Mike Kathleen, GA --- In [email protected], "Tony King, W4ZT" <[EMAIL PROTECTED]> wrote: > Mike, > > What frequency are you guys on? How high is your antenna? How long has > this problem been going on? How often does it happen? What's the call > of your repeater? > > There might be an explanation other than intermod. There is one VHF > repeater in metro Atlanta (West) right now that frequently goes spurious > and, while on the actual operating frequency of that repeater during the > failure you can't hear the users (well, maybe very weak and with > sizzling), you can hear that repeater signal with audio sweeping across > other frequencies (other repeater inputs). > > 73, Tony W4ZT (Union City) > > Mike - WM4B wrote: > > >Dick, > > > >Thanks for the info... that helps steer me in the right direction. > >We've got a CAT-1000 controller and I'm still trying to get smart > >about it. It seems like it does everything but butter your toast in > >the morning, and it might even do that if I can figure out the right > >command! I wish we could just solve the intermod problem, but it's > >so intermittant we can't chase it down, so I guess the bandaide > >approach will have to do! > > > >-- de WM4B > >Mike > >Kathleen, GA > > > >--- In [email protected], "Rich Misener" <[EMAIL PROTECTED]> > >wrote: > > > > > >>Mike, > >> > >>I had this problem with the 146.800 repeater, here in Northeast > >>Oregon, when Fox fired up Ch. 11 (318,000 Watts ERP)about 200 feet > >>from our tower. The club refused to let me put it in total PL, due > >>to the number of members that did not have tone capability, so I > >>compromised and put it in both. I was fortunate to be using the > >>venerable SCOM 5K controller (keeps going, and going, and going). > >>After installing an old Comspec TS-32P that I had in the parts > >> > >> > >pile, > > > > > >>I set the 5K to respond to either "COR or PL" and tightening the > >>squelch to eleminate the burbs and chirps of the intermod. When the squelch is broken the controller goes into repeat. This works in most cases, but allows for mobile drop-out and severe flutter. When a PL tone is detected, the controller goes to repeat, regardless of the squelch setting. This will only work if you install the decoder ahead of the squelch. In my case VOL/SQL HI in a MASTR II. Most newer controllers have the ability to key the transmitter with "COR only", "PL only", "COR and PL", or "COR or PL". If your controller does not have these features, you can build a circuit with a few cheap common parts to do the job. Let us know if you need more help. > >> > >> > >>Dick---N7ZH > >>Technical Director > >>Spout Springs Repeater Association > >> > >> > >>--- In [email protected], "Mike - WM4B" > >><[EMAIL PROTECTED]> wrote: > >> > >> > >>>Greetings all, > >>> > >>>I've just been brougt on board to assist our local repeater guru and we've been working on trying to solve an intermod problem we have. Thus far, we've had little luck finding the source, and one solution we discussed was to add PL to the machine. Unfortunately, (or > >>>fortunately) the club really doesn't want to PL the machine. It's one of the few 'toneless' machines in this area, and we're located right off of I-75, where we have the potential to get a lot of hams passing through. > >>> > >>>I've heard from several folks that it's possible to set up dual > >>>squelch levels... one for signals with PL and one for those without. We know that by setting the squelch tight, we don't get the intermod problem (at least not to any significant extent), so if would could set the squelch tight, allowing ALL signals to access the machine, and then bypass that setting with a looser squelch for those that have PL, we'd be in pretty good shape. > >>> > >>>Can one of you guru's point me in the right direction? > >>> > >>>Thanks, > >>> > >>>Mike > >>>WM4B > >>>Kathleen, GA > >>> > >>> Yahoo! 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