Re: [Repeater-Builder] Repeater Interference

[Neal Newman]

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.