Hi Skipp, Yes I reread the post and realize I jumped to some horrible conclusion. My bad. Guess I'll sink back into my cave and think twice before commenting.
Randy --- In Repeater-Builder@yahoogroups.com, "skipp025" <skipp...@...> wrote: > > > Hi Randy, > > I did place a notch cavity in the antenna feed line, tuned > to the image frequency of the receiver IF. > > As an example > > Notch 245.750MHz (TV Channel 14 Audio Carrier Frequency) > > 245.750MHz minus 21.4 IF = 224.05 > > Receiver IF Frequencies vary a bit... and both Channel > 13 and 14 analog are quite happy to provide a strong > image source. > > Original Icom 3AT portables are/were really problematic > to use in my area because of poor TV signal image rejection. > > cheers, > skipp > > > "wb8art" <wb8art@> wrote: > > Skipp, why would you not filter it on the input? > > Randy > > > > > > --- In Repeater-Builder@yahoogroups.com, "skipp025" <skipp025@> > > wrote: > > > > > > 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" <mryan001@> 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 > > > > > > > > > >
