Hi Possib. a high power C.B. operater. ----- Original Message ----- From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Thursday, February 26, 2009 9:51 AM Subject: [Repeater-Builder] Re: Interference or Intermod ( ? ) Help....here goes
I remember that Neutec Unit... saw it on Ebay. Mike Do you have any analog television stations on channel(s) 11 through 14 in the area still on the air? If so, I might suspect an IF image might be possible. I had the same type of problem here from channel 13 getting into a number of Icom receivers. I had to notch the image frequency of my IF to get rid of it. s. > "Michael Ryan" <mryan...@...> wrote: > > My recent efforts at putting a 220 repeater on the air here in western > Florida have been mildly succesful. I am using a Neutec designed repeater. > ( I know there are some uhf and vhf models around, this one is on 220, a > RANGER brand ). The repeater is open access. And runs quiet all day or > night, nothing cracking the squelch at all. But during times when there is > a conversation going on after a few minutes a rather nasty signal captures > the repeater sometimes in short bursts, sometimes much longer. "Sounds like > someone talking into a reverb chamber.." I had been using a Mirage brick > amp in the rack, but suspected that this amp might be the problem, some > oscillation or internal mixing of some sort. This turned out not to be the > case, the amp though still in the circuit is OFF but we still get the > garbage. When the amp would be ON, and I would sometimes hear this stuff > start, and I could turn OFF the amp an it would stop. But shortly later > even with the amp OFF, it is back.very odd that it would appear to me. > > Now, all cables in the rack are RG-400. Every one in the rack. Half inch > hardline runs to the antenna, though there is a splice with a double male N > connector as I recall. The Neutec unit does about 25 watts output but I have > it cut back to about 10 watts thinking it will run cooler. Thus with the > small brick amp it was doing about 65 watts output to the Telewave 4 cavity > duplexer. > > While at the site tonight, I could hear something getting into the recvr. > The repeater was UP, but no one talking at that moment. Again, nothing on > it's own ever appears to break the squelch. The noise was heard through the > repeater's on board speaker, meaning it was coming through the antenna / > recvr and not something produced in the rack I would assume. > > There is a cel tower about 1,000ft away and another tower with ( who knows ) > how many other users, another 500ft further away. Based on this little bit > of info what would the masses suggest in first FINDING the offending source > if is indeed intermod? Then, is there much than can be done short of > moving my machine? Any ideas or suggestions? > > n Mike > ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.237 / Virus Database: 270.11.3/1973 - Release Date: 02/26/09 07:03:00
