Hello again, I am working on a weird interference problem right now for that matter, it's been going on for two weeks or so. I have a customer that I maintain a 800 MHz LTR Trunk system for. One of the receivers is getting a stable dead carrier signal 2.5 KHz high in frequency. It is absolutely coming down the receive antenna, it's a split receive/transmit site. The tower is 800 feet tall.
I have no idea what the frequencies are in the building and I doubt it ATC does so I can't run a intermod study and the signal is there 100% of the time making me think it's not intermod. It's also too stable to be a transmitter in oscillation. I have turned off almost everything in the building, except the National Weather Service 1000 watt transmitter and I did not have the guts to do that. The signal is steady with little or no deviation, just a dead carrier. This is a ATC site by the way and of little help. Today I went to another 1000 foot tower about 20 miles to the North and the signal was there also but much lower in amplitude so it looks like the origin is South somewhere. I also checked at my tower 30 miles to the Northwest and did not hear the signal. There is another co-channel user about 40 miles Northeast and they are not having problems. With the problem on 100% of the time it looks really like it's the NWS transmitter but from what I see and heard about their service department I don't expect any help. One thing, if it were intermod or transmit noise from the NWS I would think I would get some kind of modulation that would equate to what we see on the 162.55 frequency. As with the other interference I spoke of earlier I can't see the interference from any of the spots I have been to so far. If you can't see the signal with a receiver you can't track it. Sad part? This system is getting turned off in about 45 days, just not enough customers to pay the ATC bill! I guess it's a good thing, they will be moving it to my tower which is not hearing the interference! Just talking (or emailing) out loud to myself. Paul -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Richard Sent: Wednesday, January 11, 2006 10:20 PM To: [email protected] Subject: RE: [Repeater-Builder] OT - funny interference story I concur... This is one of the most interesting groups I've had the pleasure of participating in. Indeed, a rare collection of talent in this group. Fairly new to the world of repeaters, Richard, N7TGB -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Tony VE6MVP Sent: Wednesday, January 11, 2006 2:32 PM To: [email protected] Subject: Re: [Repeater-Builder] OT - funny interference story At 03:58 PM 2006-01-11 -0600, you wrote: >Very Interesting Agreed. Anecdotes like this are always worth reading. An excellent means of passing knowledge down the generations. Tony (a newbieish ham) Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
