Some years back, when we installed the repeater (also 146.760/160) in a new building, we noticed a weak buzz...buzz signal ~once a second, very near the input frequrncy. After much searching, it turned out to be the smoke alarm heads within the building, all hard wired into their own AC line. Not all of them emitted a signal. Fortunately the signal was pretty weak and drifted around somewhat. We use PL on the input so it masked the problem so it wasn't a serious problem. Good luck hunting.
George --- In [email protected], "lpcoates" <[EMAIL PROTECTED]> wrote: > > Hi > > Our radio club has a portable repeater on 146.760 (-). Each time we > install it on a commercial building we find what appears to be > interference on or very near the input frequncy of 146.160. This > repeater was installed at two private homes for several weeks each and > worked flawlessley. Tonight it began to act up after just a few > minutes. Another repeater was tried at one of these commercial sites > and it also appeared to be receiving interference on 146.160. Tonight > I tried a simple test of tuning my hand held to 146.160 and found > several "hot spots" in the room where I picked up something as well as > picking up something radiating from the electrical conduit. Both of > the commercial sites have elevator equipment, one quite old and one > very modern. One site hosts several other radio systems from 400 MHz > to 10 GHz and the other site has not other radio equipment. Both > buildings are 12 story office buildings. > > My question is, have other people found that this frequency is > especially prone to interference from nearby electrical and electronic > equipment? I know that the output frequency of 146.760 can be a > problem because it's very close to the 41nd harmonic of the colorburst > crystal, but I haven't been able to find any mention of problems on the > input frequency of 146.160. > > Thanks > > Bruce - VE5BNC >
