[Repeater-Builder] Re: New QRM on 220 MHz.......?
We have been having a similar problem here in Toronto on 224.86. The frequency has been in use for years but recently we have been finding carriers on the output. Many have suggested we put a PL on VE3RPT but that is avoiding the issue. One member has observed that they seem strongest near traffic lights, as if there is some unshielded micro inside them. Has anybody else observed this phenomenon? If so, maybe we can compare to see if it is always the same make of traffic light controller. Unfortunately I don't have a mitre on 220! 73 Nigel, ve3id Director TFMCS (VE3RPT/VE3TFM/VE3TWR/VE3SIX)
Re: [Repeater-Builder] Re: New QRM on 220 MHz.......?
I saw something recently on the FCC Enforcement pages about some remote sensors for traffic lights causing interference to a licensed service... turns out the units that were installed were not designed to be sold in the U.S. and were shipped to the installer by mistake. Needless to say, they were taken out of service immediately and replaced with appropriate FCC-certified units. Sounds like you may have run into a similar situation. - Original Message - From: Nigel Johnson [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, January 01, 2008 1:57 PM Subject: [Repeater-Builder] Re: New QRM on 220 MHz...? We have been having a similar problem here in Toronto on 224.86. The frequency has been in use for years but recently we have been finding carriers on the output. Many have suggested we put a PL on VE3RPT but that is avoiding the issue. One member has observed that they seem strongest near traffic lights, as if there is some unshielded micro inside them. Has anybody else observed this phenomenon? If so, maybe we can compare to see if it is always the same make of traffic light controller. Unfortunately I don't have a mitre on 220! 73 Nigel, ve3id Director TFMCS (VE3RPT/VE3TFM/VE3TWR/VE3SIX)
[Repeater-Builder] Re: New QRM on 220 MHz.......?
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
Re: [Repeater-Builder] Re: New QRM on 220 MHz...... or any other band
I think it's safe to say If you haven't been hit by an interference problem, your turn is coming. It doesn't matter what part of the spectrum you are talking about or whether it's commercial, broadcast or ham. Consider yourself lucky if you've avoided it so far. Chuck WB2EDV - Original Message - From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, December 31, 2007 1:24 PM Subject: [Repeater-Builder] Re: New QRM on 220 MHz...? 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. [snip]
Re: [Repeater-Builder] Re: New QRM on 220 MHz.......?
Key up on the frequency of the mike and loudly say This is the devil, I hear you and I am coming. 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.
[Repeater-Builder] Re: New QRM on 220 MHz...... or any other band
Well... If you're talking to/about me Chuck... well let's just say that I feel comfortable saying that I have chased down more interference problems that say.. at least 90% of the people on this group. If you look at the size of the group you'll see it is no small number. Pick a card... any card... :-) cheers, s. Chuck Kelsey [EMAIL PROTECTED] wrote: I think it's safe to say If you haven't been hit by an interference problem, your turn is coming. It doesn't matter that part of the spectrum you are talking about or whether it's commercial, broadcast or ham. Consider yourself lucky if you've avoided it so far. Chuck WB2EDV - Original Message - From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, December 31, 2007 1:24 PM Subject: [Repeater-Builder] Re: New QRM on 220 MHz...? 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. [snip]
Re: [Repeater-Builder] Re: New QRM on 220 MHz...... or any other band
My comment was general in nature to the group. Chuck WB2EDV - Original Message - From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, December 31, 2007 4:15 PM Subject: [Repeater-Builder] Re: New QRM on 220 MHz.. or any other band Well... If you're talking to/about me Chuck... well let's just say that I feel comfortable saying that I have chased down more interference problems that say.. at least 90% of the people on this group. If you look at the size of the group you'll see it is no small number. Pick a card... any card... :-) cheers, s.
[Repeater-Builder] Re: New QRM on 220 MHz...... or any other band
No problem Chuck... maybe what I wrote didn't come off right. What I meant is I have a very large bucket of interference war stories I could share. I wish I could say they've reduced in number over the years but... nay. Happy New Year everyone... cheers, s. Chuck Kelsey [EMAIL PROTECTED] wrote: My comment was general in nature to the group. Chuck WB2EDV
Re: [Repeater-Builder] Re: New QRM on 220 MHz...... or any other band
No, I agree with you. It's getting worse out there. The odds are greater and greater that interference is coming to a repeater near you. Chuck WB2EDV - Original Message - From: skipp025 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, December 31, 2007 10:37 PM Subject: [Repeater-Builder] Re: New QRM on 220 MHz.. or any other band No problem Chuck... maybe what I wrote didn't come off right. What I meant is I have a very large bucket of interference war stories I could share. I wish I could say they've reduced in number over the years but... nay. Happy New Year everyone... cheers, s. Chuck Kelsey [EMAIL PROTECTED] wrote: My comment was general in nature to the group. Chuck WB2EDV Yahoo! Groups Links
[Repeater-Builder] Re: New QRM on 220 MHz.......?
Yes Roger - I do hear this on 220 from time to time and more so in the dense city environments. If you are going to search for Cable TV leakage listen to 221.750(CATV CH 23 Audio Carrier) or 223.250(CATV CH 24 Video Carrier). These will yield you the best signal levels. Good luck..dan n2aym --- In Repeater-Builder@yahoogroups.com, 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
Re: [Repeater-Builder] Re: New QRM on 220 MHz.......?
Thanks for the freqs. I put my 220 on PL some time ago just to solve a one time fluke problem we were having and I left it on all the time so as not to worry. Roger W5RD - Original Message - From: fineshot1 To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 30, 2007 6:55 PM Subject: [Repeater-Builder] Re: New QRM on 220 MHz...? Yes Roger - I do hear this on 220 from time to time and more so in the dense city environments. If you are going to search for Cable TV leakage listen to 221.750(CATV CH 23 Audio Carrier) or 223.250(CATV CH 24 Video Carrier). These will yield you the best signal levels. Good luck..dan n2aym --- In Repeater-Builder@yahoogroups.com, 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 -- Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.17.0/1180 - Release Date: 12/10/2007 2:51 PM
