Three or four major sources of 220 QRM happen in my area. The first major source is actually not a problem... but is actually a technical issue with many of the ham radio receivers. The 224 Amateur band is a pretty good IF Image for the adjacent TV channel. So yes, we can listen to the daytime soaps on the classic Icom 3at hand-held radios without trying hard. Most of us deal with it by hopefully living far enough away from the TV transmitter that simply turning up the squelch provides some measure of relief. Otherwise something like a DCI band-pass filter might be helpful.
Number two in the hit-parade is the Karaoke Mics that pop up on the input to some repeaters... I happen to be the lucky one here in Northern California. A 9-volt battery powered mic reaches my 5+ miles distant high level repeater site quite well. The only song request we've made is to track the user/owner down and ask that he stop using that mic, which so far has worked quite well. Number three is the pesky parrot simplex repeater parked on the repeater input... we have another one on the air causing problems in our area. We're trying to deal with that right now... so that saga continues. Number four is some data telemetry that often sounds like chirping or soft CW. We found the problem signal location and contacted the area comm-shop who removed it without ever admitting the problem or acknowledging it was there. We found the signal was traced back to some unlicensed telemetry equipment used by a water service. I have not received much of a problem from any of the remaining 220 Band ACSB trunking equipment. So there ya go... cheers, s. > "res1q6fs" <[EMAIL PROTECTED]> wrote: > > As I mobile around while monitoring the output of my 224.18 MHz repeater as I have done for many years (it has been on the air since the late 70's), I have never heard any kind of strange signals on its output freq. or any 220 output freq. I have a 3 band Kenwood in the car and am used to hearing signals break the squelch on certain 2M and 440 frequencies, but never 220. The past few weeks, I have heard signals (CW, no modulation noticed) of a fairly strong nature break the squelch on 224.18 MHz, much like the signals that break the squelch on certain 440 repeater output freqs, which were eventually traced to cable TV leakage. > > I am wondering if anyone else has heard signals of this nature on the 220 band? I know of three places within a few miles of my house that emit these signals. I am going to take my talkie out one of these days ands see if I can "home" in on one of these new signals. > > Roger W5RD >
