145.25 can be a real pain. We have a repeater on that frequency. It is CATV channel E. We always have leaks from the cable rendering the repeater useless in some areas until a call is made to the CATV plant. They go out and tighten the screws on an amplifier (left loose by the last tech working on it), replace a damaged section of hardline or tighten up some connectors that worked loose due to temperature variations. It is a never ending battle.
The major CATV plants here have offset from 145.25 as they have to do for the FAA when using some of the channels in the aviation band. That helps until the leakage gets real bad. The minor players, the apartment complexes and motels just do not care and will not offset. There is always leakage from CATV. 73 Glenn WB4UIV At 09:17 AM 10/24/07, you wrote: > >> OK - Here are my requirements for the transmit chain. minimal > >> physical space and minimal insertion loss :-) (ok - too > >> bloody obvious) Tuning simplicity is also a factor. I'm > >> combining 3 transmitters at 144.39, 145.05 +/- 0.04 and 145.25 ><snip> > >> Can you list out some of the other options that I might be > >> able to squeeze onto my trailer ?? > >You're trying to do all this in a trailer????? >Forget it, put up separate antennas for each radio and live with the >desense. >Not unless you feel like spending 10's of thousands of $$$$$$$$$. > >Went back and looked again, the 145.25 is to be a REPEATER??? Dude, hang >it up. Put the repeater on UHF and be done with it. Anything else is >ASKING for trouble. And put the other two on separate antennas and live >with it. You'll spend thousands of dollars and hundreds of hours making >this work and *KEEPING* it working! > > > I've run into some hitches getting a UHF backyard pair, or I would move the > > repeater to UHF in a heartbeat -- already have the duplexer for that, and > > that would leave me with a pretty standard BP/BP duplexer setup to separate > > the simplex radios, and would additionally get me back on a single antenna. > >Hogwash. 2M is FAR tougher to get a pair on then UHF. Unless you live in >one of the areas that UHF is getting taken out by mil radar, I guarantee >there is a pair available on UHF somewhere. In the *REALLY* strange >event there isn't, I GUARANTEE there is no pairs on 2M either. > >Find something like, oh, say, 444.0125 for instance, something where >there isn't a nearby repeater on either side, keep the deviation down to >+/-4KHz max, and you'll be fine. >-- >Jim Barbour >WD8CHL > > > > > > >Yahoo! Groups Links > > >
