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
