RE: [Repeater-Builder] OT - NOW NOT SO funny interference story
Bob, I wrap the radio in aluminum foil, leaving a hole for the S Meter indicator volume knob. Learned that one from Walt also. Looks ugly but works well. On this 800 foot tower RG-8 would not work. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Friday, January 13, 2006 1:29 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] OT - NOW NOT SO funny interference story At 1/12/2006 19:01, you wrote: >Nate, > >That is the only way I can see to find the problem, send someone up the >tower with a HT with a S meter, cavity and Yagi. This interference I am >fighting is on 815 MHz so I have the ability to send a 4 inch cavity. Can >you imagine the look on the tower guys face when you handed him a 4 inch 2 >Meter DB cavity. > >Paul Problem is RF will go through the case of the HT & overload it. I had to do this once to find an interference source on a tower; used 100 ft. of RG8 to a pass cavity & good RX on the ground. The tower climber just carried a yagi up the tower. Worked well. Bob NO6B 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/
RE: [Repeater-Builder] OT - NOW NOT SO funny interference story
Right on Brother! Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Charles Miller Sent: Thursday, January 12, 2006 10:53 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] OT - NOW NOT SO funny interference story Were not a State, We are a country, The Republic of Texas. - Original Message - From: "Paul Finch" <[EMAIL PROTECTED]> To: Sent: Thursday, January 12, 2006 8:50 AM Subject: RE: [Repeater-Builder] OT - NOW NOT SO funny interference story > Texas > > > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of Maire-Radios > Sent: Wednesday, January 11, 2006 11:20 PM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] OT - NOW NOT SO funny interference story > > > what state are you in? > > > - Original Message - > From: "Paul Finch" <[EMAIL PROTECTED]> > To: > Sent: Thursday, January 12, 2006 12:13 AM > Subject: [Repeater-Builder] OT - NOW NOT SO funny interference story > > > > 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: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] Behalf Of Richard > > Sent: Wednesday, January 11, 2006 10:20 PM > > To: Repeater-Builder@yahoogroups.com > > 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: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] Behalf Of Tony VE6MVP > > Sent: Wednesday, January 11, 2006 2:32 PM > > To: Repeater-Builder@yahoogroups.com > > 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 knowl
RE: [Repeater-Builder] OT - NOW NOT SO funny interference story
At 1/12/2006 19:01, you wrote: >Nate, > >That is the only way I can see to find the problem, send someone up the >tower with a HT with a S meter, cavity and Yagi. This interference I am >fighting is on 815 MHz so I have the ability to send a 4 inch cavity. Can >you imagine the look on the tower guys face when you handed him a 4 inch 2 >Meter DB cavity. > >Paul Problem is RF will go through the case of the HT & overload it. I had to do this once to find an interference source on a tower; used 100 ft. of RG8 to a pass cavity & good RX on the ground. The tower climber just carried a yagi up the tower. Worked well. Bob NO6B 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/
RE: [Repeater-Builder] OT - NOW NOT SO funny interference story
Nate, I'd start by doing some "office DF'ing" before spending time on the hill this time of year. My first guess would be local oscillator leakage from something on the hill. Try doing an FCC ULS database search for anything within a mile or so of the site, make a list of the Rx frequencies in a spreadsheet, and make colums for the "usual suspect" IF offsets (+10.7, -10.7, 11.2 for M2's, 11.7 for Micors, etc.) and see if you find anything on 147.825 +/- 10 kHz or thereabouts). A local two-way shop here got a visit from the FCC because of excessive LO leakage. They were using Mitreks in a repeater installation, and the LO leakage was strong enough to bother another receiver several miles away. The FCC wasn't happy with them for using mobile radios in station operation... Probably 15 years or so ago I had a dead carrier holding open one of my UHF ham repeaters (it ran carrier squelch back then). The repeater is 443.800+, input 448.800. The carrier was there for an hour or more, so I figured I'd take a drive up to the site (it was about 1AM, but hey, I was bored, and the site was only 10 minutes away). I couldn't hear the carrier on the input on my drive to the site until I pulled in the gate, then it started getting stronger and stronger as I got closer. Then I saw a Motorola service van parked next to the shelter with the lights on, engine running, and a girl in the passenger seat. I walked into the site, scaring the bejesus out of the tech, to ask him what he was doing. He was working on an 800 MHz Ardis box. I nosed around a bit, trying to find this dead carrier with an HT. Then all of a sudden it went away, and a few seconds later, the girl that had been sitting in the Motorola van came into the site. Long story short, the girl in the van was the tech's girlfriend. He got the service call, and she decided to come along for the ride to keep him company. While he was working, she turned on the radio in the van and was listening to 101.5FM. The LO in the FM radio, like many FM radios, is 10.7 MHz high-side, so that's 112.2. The fourth harmonic would be, you guessed it, 448.8. And the mystery was solved. --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of Nate Duehr > Sent: Thursday, January 12, 2006 7:19 PM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] OT - NOW NOT SO funny > interference story > > > We're also hunting a "dead carrier" on the repeater input of > our 147.225 > system in Denver. Total pain in the ***. > > The only antenna that appears to hear it reliably is the one > that's up > on the tower, on the mountain... of course. Nothing at > ground level has > been able to pick it up yet, and it's too cold/windy to > really be up the > tower with a receiver and yagi this time of year. > > The carrier/mix is not toned, of course, and the repeater is > -- so the > system is still "usable" but boy does it sound bad when weak-signal > users use the system. > > Sigh... > > Nate WY0X > > > > > > > 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/
Re: [Repeater-Builder] OT - NOW NOT SO funny interference story
Were not a State, We are a country, The Republic of Texas. - Original Message - From: "Paul Finch" <[EMAIL PROTECTED]> To: Sent: Thursday, January 12, 2006 8:50 AM Subject: RE: [Repeater-Builder] OT - NOW NOT SO funny interference story > Texas > > > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of Maire-Radios > Sent: Wednesday, January 11, 2006 11:20 PM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] OT - NOW NOT SO funny interference story > > > what state are you in? > > > - Original Message - > From: "Paul Finch" <[EMAIL PROTECTED]> > To: > Sent: Thursday, January 12, 2006 12:13 AM > Subject: [Repeater-Builder] OT - NOW NOT SO funny interference story > > > > 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: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] Behalf Of Richard > > Sent: Wednesday, January 11, 2006 10:20 PM > > To: Repeater-Builder@yahoogroups.com > > 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: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] Behalf Of Tony VE6MVP > > Sent: Wednesday, January 11, 2006 2:32 PM > > To: Repeater-Builder@yahoogroups.com > > 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 > > > > > > > > > > > > > > > > > > > > > > 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/
RE: [Repeater-Builder] OT - NOW NOT SO funny interference story
Nate, That is the only way I can see to find the problem, send someone up the tower with a HT with a S meter, cavity and Yagi. This interference I am fighting is on 815 MHz so I have the ability to send a 4 inch cavity. Can you imagine the look on the tower guys face when you handed him a 4 inch 2 Meter DB cavity. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Nate Duehr Sent: Thursday, January 12, 2006 6:19 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] OT - NOW NOT SO funny interference story We're also hunting a "dead carrier" on the repeater input of our 147.225 system in Denver. Total pain in the ***. The only antenna that appears to hear it reliably is the one that's up on the tower, on the mountain... of course. Nothing at ground level has been able to pick it up yet, and it's too cold/windy to really be up the tower with a receiver and yagi this time of year. The carrier/mix is not toned, of course, and the repeater is -- so the system is still "usable" but boy does it sound bad when weak-signal users use the system. Sigh... Nate WY0X 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/
Re: [Repeater-Builder] OT - NOW NOT SO funny interference story
We're also hunting a "dead carrier" on the repeater input of our 147.225 system in Denver. Total pain in the ***. The only antenna that appears to hear it reliably is the one that's up on the tower, on the mountain... of course. Nothing at ground level has been able to pick it up yet, and it's too cold/windy to really be up the tower with a receiver and yagi this time of year. The carrier/mix is not toned, of course, and the repeater is -- so the system is still "usable" but boy does it sound bad when weak-signal users use the system. Sigh... Nate WY0X 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/
RE: [Repeater-Builder] OT - NOW NOT SO funny interference story
Texas -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Maire-Radios Sent: Wednesday, January 11, 2006 11:20 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] OT - NOW NOT SO funny interference story what state are you in? - Original Message - From: "Paul Finch" <[EMAIL PROTECTED]> To: Sent: Thursday, January 12, 2006 12:13 AM Subject: [Repeater-Builder] OT - NOW NOT SO funny interference story > 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: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of Richard > Sent: Wednesday, January 11, 2006 10:20 PM > To: Repeater-Builder@yahoogroups.com > 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: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of Tony VE6MVP > Sent: Wednesday, January 11, 2006 2:32 PM > To: Repeater-Builder@yahoogroups.com > 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 > > > > > > > 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/
Re: [Repeater-Builder] OT - NOW NOT SO funny interference story
what state are you in? - Original Message - From: "Paul Finch" <[EMAIL PROTECTED]> To: Sent: Thursday, January 12, 2006 12:13 AM Subject: [Repeater-Builder] OT - NOW NOT SO funny interference story > 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: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of Richard > Sent: Wednesday, January 11, 2006 10:20 PM > To: Repeater-Builder@yahoogroups.com > 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: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] Behalf Of Tony VE6MVP > Sent: Wednesday, January 11, 2006 2:32 PM > To: Repeater-Builder@yahoogroups.com > 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 > > > > > > > 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/
