Re: [Repeater-Builder] Repeater interference problem cured. Caused by Uniden scanner a mile away.
Very Interesting Mark , I know that in the past I recall vaugely that I have came accross some sort of oscillation that can be picked up on a particular frequency but the distance you mentioned is something that each of us can probably came across this some time or another. Meanwhile back 2 the auctions. Mark AB8RU Mark Ramsey wrote: Whew after nearly a year of interference to my uhf amateur radio repeater I found the problem. Turned out to be a Uniden scanner more than a mile away from repeater site! The local oscillator for channel 7 in the scanner was right on frequency for the repeaters input and was tripping the repeaters squelch every time it scanned by about once a second. The interference could not be heard from a mobile radio tuned to the repeaters input but could be heard well from a hand held hooked to the repeater antenna (db420). Many attempts had been made to find the trouble by driving around listening for the clicking sound generated by the scanner with no luck. By this time I had figured out it was a scanner causing the trouble because the problem would go away when there was activity on virtually any of the local police or fire channels, the scanner would stop scanning by channel 7 and the repeater would quit kirchunking. Completely fed up (can't take no more) I decided to take a different approach. I found by transmitting on one of the public service channels the scanner could be made to stop on that frequency, Yes I realize this not exactly legal but remember I can't take no more. Anyway after a few short transmissions away from the repeater site I found the general area. Now in that area I am able to switch on my service monitor and transmit a weak signal and attenuate it as I get closer the whole time listening to the repeater kirchunk. Finally I must be close I can hear the interference on my ht tuned to the repeaters input. Bad news it is an apartment complex with about 100 units crammed in a small area. Time to walk around complex with ht and listen. Wow now I have narrowed it down to 4 apartments! Let's talk to some of the neighbors standing outside. One person said it's got to be that mean old lady across the street she's got a scanner but you don't want to knock on her door she is just plain mean. Walked over there with ht, no problem not there thank goodness. Talked to someone else she said I know everyone here except apartment 4 and I can tell you no one has a scanner. I thanked her and knocked on apartment 4 door not knowing what to expect would they be nice would they be mean would they be understanding would they be home? The door opened one glance into the living room revealed a Uniden scanner. I explained the situation to the gentleman at the door who turned out to be one of the nicest people I have ever met. He allowed me access to his scanner and the channel causing interference to my repeater was one he doesn't even listen to nothing even in the area on that frequency. We programmed another frequency into channel 7 he's happy I'm ecstatic and the problem is cured. Thank you I said and drove home. Can you believe this? It's true. 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] Repeater interference problem cured. Caused by Uniden scanner a mile away.
Have you considered adding a CTCSS decoder to your repeater? It won't hide the problem ... but you hopefully won't go insane in the process. Neil - WA6KLA Mark Ramsey wrote: Whew after nearly a year of interference to my uhf amateur radio repeater I found the problem. Turned out to be a Uniden scanner more than a mile away from repeater site! The local oscillator for channel 7 in the scanner was right on frequency for the repeaters input and was tripping the repeaters squelch every time it scanned by about once a second. The interference could not be heard from a mobile radio tuned to the repeaters input but could be heard well from a hand held hooked to the repeater antenna (db420). Many attempts had been made to find the trouble by driving around listening for the clicking sound generated by the scanner with no luck. By this time I had figured out it was a scanner causing the trouble because the problem would go away when there was activity on virtually any of the local police or fire channels, the scanner would stop scanning by channel 7 and the repeater would quit kirchunking. Completely fed up (can't take no more) I decided to take a different approach. I found by transmitting on one of the public service channels the scanner could be made to stop on that frequency, Yes I realize this not exactly legal but remember I can't take no more. Anyway after a few short transmissions away from the repeater site I found the general area. Now in that area I am able to switch on my service monitor and transmit a weak signal and attenuate it as I get closer the whole time listening to the repeater kirchunk. Finally I must be close I can hear the interference on my ht tuned to the repeaters input. Bad news it is an apartment complex with about 100 units crammed in a small area. Time to walk around complex with ht and listen. Wow now I have narrowed it down to 4 apartments! Let's talk to some of the neighbors standing outside. One person said it's got to be that mean old lady across the street she's got a scanner but you don't want to knock on her door she is just plain mean. Walked over there with ht, no problem not there thank goodness. Talked to someone else she said I know everyone here except apartment 4 and I can tell you no one has a scanner. I thanked her and knocked on apartment 4 door not knowing what to expect would they be nice would they be mean would they be understanding would they be home? The door opened one glance into the living room revealed a Uniden scanner. I explained the situation to the gentleman at the door who turned out to be one of the nicest people I have ever met. He allowed me access to his scanner and the channel causing interference to my repeater was one he doesn't even listen to nothing even in the area on that frequency. We programmed another frequency into channel 7 he's happy I'm ecstatic and the problem is cured. Thank you I said and drove home. Can you believe this? It's true. 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] Repeater interference problem cured. Caused by Uniden scanner a mile away.
Neil, I have a CTCSS decoder 131.8 on My 444.750 Micor unified Repeater. I Have cable leakage so bad on the input 449.750 it keys up the repeater a lot, Even with the PL, I Deal with it during the day, But I have been turning it off at night. It has been like this for two weeks unless it rains. I did track it down to a Pole Two blocks away and verify that it is the Food network on Wide open west cable channel; # 65 , I have two cable companies in My area and I have Notified them both. And I indicated that it might be wise to fix the problem and not involve the FCC, One always has to make sure our own house is clean. They stated it would be taken care of, But I still have not heard anything from them. I do subscribe to WOW Cable. I did a Spectrum check and it has spurs all up and down the bands. So in My case the PL Did not stop it. But You are Right with the Scanner Problem it would. Happy Repeater Building 444.750 224.740 Don KA9QJG 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] Repeater interference problem cured. Caused by Uniden scanner a mile away.
At 09:46 PM 8/11/2005 -0500, you wrote: Neil, I have a CTCSS decoder 131.8 on My 444.750 Micor unified Repeater. I Have cable leakage so bad on the input 449.750 it keys up the repeater a lot, Even with the PL ---Well...there's always DPL :-) Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] Repeater interference problem cured. Caused by Uniden scanner a mile away.
KA9QJG wrote: Neil, I have a CTCSS decoder 131.8 on My 444.750 Micor unified Repeater. I Have cable leakage so bad on the input 449.750 it keys up the repeater a Don, can you talk your state into flipping input/output the right way around? Outputs on UHF here are on the high end! (GRIN... heh.) You can move out West here, if you want... we won't mind. :-) 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] Repeater interference problem cured. Caused by Uniden scanner a mile away.
Nate Duehr wrote: Don, can you talk your state into flipping input/output the right way around? Outputs on UHF here are on the high end! (GRIN... heh.) LOL! Good one! When did the FCC 'flip' the 450-512 MHz bands? ;-P Here in the East, we don't put up with the intrmod products from 450-455 MHz mixing with our own transmitters and ending up on not only our inputs, but the inputs of a commercial (frequently PS) systems as well. :-P (That's a good way to lose sites) OK, so there may be a frequency or two with 'issues', such as 444.750. Two is better than most. Joe M. 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] Repeater Interference
Hello list, I have a novel idea... Remove the new duplexer you bought and replace it with the 6-pack mobile duplexer without the problem:) Most repeater owners will agree if it's not broke DON'T fix it! Regards, Barry --- Neal Newman [EMAIL PROTECTED] wrote: First off You changed the Duplexer? how about the cables? I have found that a bad connection or Oxidation acts as a diode. and will allow the AM stations Audio to be heard.. I have this problem with a telco Box the Phone company placed Exactly 1/4 wavelength away From My 10 kw AM trnamitter.. Everyone in the Neighborhood hears my radio station on their Phones.. But its Not my problem... Its some Engineers problem at thePhone Company. How stupid can One Be.. I know the answer He has an Engineering degree In theory It should Be ok where it s... NOT... Mark Holman wrote: I would get in touch with the station Engineer and ask him or her if they may adjusted something, added or removed anything within the past time frame that this interference started. If they say No then you may have something on your end just went out. I would start with the Ground to see if the continuity of Resistance is Zero Ohms. from Chasis, Cabinet, rack, etc.. especially green crud from moisture will start a resistance path to ground. a good oscilloscope check will indicate intermittent, as well a VOM check. Good Hunting ! Mark Holman, CRO AB8RU - Original Message - From: Jeff Thomas [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 6:25 PM Subject: Re: [Repeater-Builder] Repeater Interference Thanks Mike, The station is 1420 AM. Nothing else was changed besides the duplexer. The AM station audio is audible during the entire time the repeater transmitter is transmitting, even during the hang time. It is a much lower level compared to the repeated audio and it is perfectly clear. I could hear everything Rush Limbaugh was saying. Thanks for your help. Jeff - W2JRT - Original Message - From: Mike WA6ILQ [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 1:29 PM Subject: Re: [Repeater-Builder] Repeater Interference At 07:43 AM 11/23/04, you wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Cellwave Notch type mobile duplexer and experienced no problems what so ever. Recently I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Cellwave. This morning I have noticed that the nearby radio station is now coming through on the repeaters transmitted signal. Anyone have an idea what causes this and how to get rid of it? Thanks, Jeff Is the station AM or FM ??? What else was changed besides swapping out the duplexer? Is the station audio audible during the received signal only, or is it also there during the carrier delay ?? (the time period that the TX is still up after the RX squelch closes and before the repeater carrier drops). Can you hear it under the ID? How loud is it compared to user audio or ID audio? Mike WA6ILQ Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links __ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail 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] Repeater Interference
I would get in touch with the station Engineer and ask him or her if they may adjusted something, added or removed anything within the past time frame that this interference started. If they say No then you may have something on your end just went out. I would start with the Ground to see if the continuity of Resistance is Zero Ohms. from Chasis, Cabinet, rack, etc.. especially green crud from moisture will start a resistance path to ground. a good oscilloscope check will indicate intermittent, as well a VOM check. Good Hunting ! Mark Holman, CRO AB8RU - Original Message - From: Jeff Thomas [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 6:25 PM Subject: Re: [Repeater-Builder] Repeater Interference Thanks Mike, The station is 1420 AM. Nothing else was changed besides the duplexer. The AM station audio is audible during the entire time the repeater transmitter is transmitting, even during the hang time. It is a much lower level compared to the repeated audio and it is perfectly clear. I could hear everything Rush Limbaugh was saying. Thanks for your help. Jeff - W2JRT - Original Message - From: Mike WA6ILQ [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 1:29 PM Subject: Re: [Repeater-Builder] Repeater Interference At 07:43 AM 11/23/04, you wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Cellwave Notch type mobile duplexer and experienced no problems what so ever. Recently I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Cellwave. This morning I have noticed that the nearby radio station is now coming through on the repeaters transmitted signal. Anyone have an idea what causes this and how to get rid of it? Thanks, Jeff Is the station AM or FM ??? What else was changed besides swapping out the duplexer? Is the station audio audible during the received signal only, or is it also there during the carrier delay ?? (the time period that the TX is still up after the RX squelch closes and before the repeater carrier drops). Can you hear it under the ID? How loud is it compared to user audio or ID audio? Mike WA6ILQ 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] Repeater Interference
First off You changed the Duplexer? how about the cables? I have found that a bad connection or Oxidation acts as a diode. and will allow the AM stations Audio to be heard.. I have this problem with a telco Box the Phone company placed Exactly 1/4 wavelength away From My 10 kw AM trnamitter.. Everyone in the Neighborhood hears my radio station on their Phones.. But its Not my problem... Its some Engineers problem at thePhone Company. How stupid can One Be.. I know the answer He has an Engineering degree In theory It should Be ok where it s... NOT... Mark Holman wrote: I would get in touch with the station Engineer and ask him or her if they may adjusted something, added or removed anything within the past time frame that this interference started. If they say No then you may have something on your end just went out. I would start with the Ground to see if the continuity of Resistance is Zero Ohms. from Chasis, Cabinet, rack, etc.. especially green crud from moisture will start a resistance path to ground. a good oscilloscope check will indicate intermittent, as well a VOM check. Good Hunting ! Mark Holman, CRO AB8RU - Original Message - From: "Jeff Thomas" [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 6:25 PM Subject: Re: [Repeater-Builder] Repeater Interference Thanks Mike, The station is 1420 AM. Nothing else was changed besides the duplexer. The AM station audio is audible during the entire time the repeater transmitter is transmitting, even during the hang time. It is a much lower level compared to the repeated audio and it is perfectly clear. I could hear everything Rush Limbaugh was saying. Thanks for your help. Jeff - W2JRT - Original Message - From: "Mike WA6ILQ" [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 1:29 PM Subject: Re: [Repeater-Builder] Repeater Interference At 07:43 AM 11/23/04, you wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Cellwave Notch type mobile duplexer and experienced no problems what so ever. Recently I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Cellwave. This morning I have noticed that the nearby radio station is now coming through on the repeaters transmitted signal. Anyone have an idea what causes this and how to get rid of it? Thanks, Jeff Is the station AM or FM ??? What else was changed besides swapping out the duplexer? Is the station audio audible during the received signal only, or is it also there during the carrier delay ?? (the time period that the TX is still up after the RX squelch closes and before the repeater carrier drops). Can you hear it under the ID? How loud is it compared to user audio or ID audio? Mike WA6ILQ 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/ 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Repeater Interference
At 08:51 PM 11/23/2004 -0500, you wrote: I would start with the Ground to see if the continuity of Resistance is Zero Ohms. from Chasis, Cabinet, rack, etc.. especially green crud from moisture will start a resistance path to ground. ---That would be my first take on his problem. Sounds like a typical ground loop problem, causing the AM RF to make it into his audio circuits. Hence, Rush Limbaugh! My best guess on why it disappears when he removes the duplexer is that ground currents are changing, causing the ground loop. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] Repeater Interference
I appreciate everyone who responded to my request for help. I will reinstall the new duplexer tomorrow and check the grounds and see what's up. Will let you know. Thanks - Original Message - From: Ken Arck [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 7:12 PM Subject: Re: [Repeater-Builder] Repeater Interference At 08:51 PM 11/23/2004 -0500, you wrote: I would start with the Ground to see if the continuity of Resistance is Zero Ohms. from Chasis, Cabinet, rack, etc.. especially green crud from moisture will start a resistance path to ground. ---That would be my first take on his problem. Sounds like a typical ground loop problem, causing the AM RF to make it into his audio circuits. Hence, Rush Limbaugh! My best guess on why it disappears when he removes the duplexer is that ground currents are changing, causing the ground loop. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] Repeater Interference]
Jeff, Please advise the make and model of your repeater, and its operating frequencies. A local repeater once had a similar problem, wherein an AM station's 104th harmonic was beating with the UHF MICOR's exciter output (which is at VHF) and was then slope-detected by the repeater's receiver. The guy who maintained (note the past tense!) the 70cm repeater was rather sloppy, and had not replaced the shield plates on the unified chassis. Once all of the shields were replaced and properly secured with all required screws, the problem went away. I am not suggesting that this is the cause in the instant case, but from the meager information presented, it appears to be slope-detection of an AM signal. The challenge is now to track down what other oscillators are running when the problem occurs. Since the AM station is heard clearly, the beating frequency is MOST likely being generated by a constantly-running crystal oscillator that is poorly shielded. Whether this oscillator is nearby or a mile away is unknown. We'll see... 73, Eric Lemmon WB6FLY W2JRT - Jeff wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Celwave notch-type mobile duplexer, and experienced no problems whatsoever. Recently, I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Celwave. This morning, I have noticed that the nearby radio station is now coming through on the repeater's transmitted signal... 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] Repeater Interference
Jeff, Please advise the make and model of your repeater, and its operating frequencies. A local repeater once had a similar problem, wherein an AM station's 104th harmonic was beating with the UHF MICOR's exciter output (which is at VHF) and was then slope-detected by the repeater's receiver. The guy who maintained (note the past tense!) the 70cm repeater was rather sloppy, and had not replaced the shield plates on the unified chassis. Once all of the shields were replaced and properly secured with all required screws, the problem went away. I am not suggesting that this is the cause in the instant case, but from the meager information presented, it appears to be slope-detection of an AM signal. The challenge is now to track down what other oscillators are running when the problem occurs. Since the AM station is heard clearly, the beating frequency is MOST likely being generated by a constantly-running crystal oscillator that is poorly shielded. Whether this oscillator is nearby or a mile away is unknown. We'll see... 73, Eric Lemmon WB6FLY W2JRT - Jeff wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Celwave notch-type mobile duplexer, and experienced no problems whatsoever. Recently, I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Celwave. This morning, I have noticed that the nearby radio station is now coming through on the repeater's transmitted signal... 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] Repeater Interference
On Nov 23, 2004, at 6:51 PM, Mark Holman wrote: clear. I could hear everything Rush Limbaugh was saying. Wow, I'd take a deliberate jammer over having to listen to Rush any day! ;-) (Oh come on, someone had to say it.) 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] Repeater Interference
At 09:18 PM 11/23/2004 -0700, you wrote: Wow, I'd take a deliberate jammer over having to listen to Rush any day! ;-) (Oh come on, someone had to say it.) In some circles, Rush Limbaugh makes great repeater ID's (as does Sean Hannity!). Besides, if I listen to one more repeater QSO about the NBA thing, I'll scream! :-) Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] Repeater Interference
Ken Arck wrote: At 08:43 AM 11/23/2004 -0700, you wrote: Anyone have an idea what causes this and how to get rid of it? ---AM? If so, your problem isn't RF related, per se. Sounds more like a case of audio rectification.. Ken don't forget about SW...and it doesn't have to be close at all. We found some interference from a SW station hundreds of miles away getting into a Micor receiver. Turns out the SW station was several Khz away from the high IF freq of the receiver (11.7, don't remember the freq of the SW station). Putting a better ground on the chassis, to the building sprinkler pipe, got rid of it. -- Jim Barbour WD8CHL 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] Repeater Interference
At 08:43 AM 11/23/2004 -0700, you wrote: Anyone have an idea what causes this and how to get rid of it? ---AM? If so, your problem isn't RF related, per se. Sounds more like a case of audio rectification.. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] Repeater Interference
At 07:43 AM 11/23/04, you wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Cellwave Notch type mobile duplexer and experienced no problems what so ever. Recently I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Cellwave. This morning I have noticed that the nearby radio station is now coming through on the repeaters transmitted signal. Anyone have an idea what causes this and how to get rid of it? Thanks, Jeff Is the station AM or FM ??? What else was changed besides swapping out the duplexer? Is the station audio audible during the received signal only, or is it also there during the carrier delay ?? (the time period that the TX is still up after the RX squelch closes and before the repeater carrier drops). Can you hear it under the ID? How loud is it compared to user audio or ID audio? Mike WA6ILQ 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] Repeater Interference
Hi Ken, Yes it is 1420 AM. How do I remove it? As soon as I put my mobile notch duplexer back in, the AM station was gone. Thanks, Jeff - Original Message - From: Ken Arck [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 3:37 PM Subject: Re: [Repeater-Builder] Repeater Interference At 08:43 AM 11/23/2004 -0700, you wrote: Anyone have an idea what causes this and how to get rid of it? ---AM? If so, your problem isn't RF related, per se. Sounds more like a case of audio rectification.. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We now offer complete Kenwood TKR repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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] Repeater Interference
Thanks Mike, The station is 1420 AM. Nothing else was changed besides the duplexer. The AM station audio is audible during the entire time the repeater transmitter is transmitting, even during the hang time. It is a much lower level compared to the repeated audio and it is perfectly clear. I could hear everything Rush Limbaugh was saying. Thanks for your help. Jeff - W2JRT - Original Message - From: Mike WA6ILQ [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, November 23, 2004 1:29 PM Subject: Re: [Repeater-Builder] Repeater Interference At 07:43 AM 11/23/04, you wrote: I have a 70cm repeater that is located about .75 mile from a commercial radio station. I was using a Cellwave Notch type mobile duplexer and experienced no problems what so ever. Recently I purchased a new Sinclair Bp/Br Q318GR, 4 cavity duplexer and replaced the Cellwave. This morning I have noticed that the nearby radio station is now coming through on the repeaters transmitted signal. Anyone have an idea what causes this and how to get rid of it? Thanks, Jeff Is the station AM or FM ??? What else was changed besides swapping out the duplexer? Is the station audio audible during the received signal only, or is it also there during the carrier delay ?? (the time period that the TX is still up after the RX squelch closes and before the repeater carrier drops). Can you hear it under the ID? How loud is it compared to user audio or ID audio? Mike WA6ILQ 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/
