[Repeater-Builder] Challenging Interference
First of all, thanks to all for reading. We have been chasing our tails for a couple of weeks trying to isolate an interference problem at our site. Any ideas would be greatly appreciated. We have a busy ham radio site. We have 2 RLC-4 controllers linked together by UHF simplex radios. A short discription: Controller 1 Port 1 = VHF repeater 146.64 Port 2 = UHF IRLP Link (simplex) Port 3 = UHF simplex link *(Linked together)* Port 4 = UHF link to controller #2 *(Linked together)* Controller 2 Port 1 =VHF Repeater 145.43 *(Linked together) * Port 2 =UHF Repeater 443.900 *(Linked together)* Port 3 =220 simplex link (223T02 224R62) *(Linked together)* Port 4 =UHF link to comtroller #1 *(Linked together) *_Problem Summary_ The problem is with the TX audio from Controller 1 port 3. whenever port 1 on controller 1 becomes active the audio bleeds through to the UHF TX audio on C1 port 3. The audio on C! port 3 is also distorted full time. The offsite repeater that C! port 3 is linked to is fine so long as the link is not being used. C1 port 3 is a new installation. Equipment is mainly Daniels and Tait. What we have tried 1. Adjusting audio levels in contoller - no joy 2. Unlinked all radios - result no change- C1 port 1 still bleeds through to C1 port 3 3. Ran another IMD study to the 5th order - no joy 4. Turned off all TX except C1 port 3 - problem still there - summized that interference not RF induced 5. Unplugged the DB9 connector on C1 port 3 and turned on it's TX - NO INTERFERENCE 6. We think that whatever is happening is in one of the contollers Our next step is to replace the 4066 quad bilateral switches tomorrow in each controller and see what happens. At less than a dollar each it's worth a try. Any thoughts or sugestions would be greatly appreciated. Right now I'm going to have a cool drink and repeat I LOVE REPEATERS 100 Times. Some pics http://www.ve7na.ca/gallery/v/repeaters Roger VA7RS
Re: [Repeater-Builder] Challenging Interference
I would agree - try the 4066 replacement first. Chuck WB2EDV - Original Message - From: Roger Stacey va...@telus.net To: Repeater-Builder@yahoogroups.com Sent: Friday, July 31, 2009 4:28 PM Subject: [Repeater-Builder] Challenging Interference 6. We think that whatever is happening is in one of the contollers Our next step is to replace the 4066 quad bilateral switches tomorrow in each controller and see what happens. At less than a dollar each it's worth a try.
Re: [Repeater-Builder] Challenging Interference
Roger, We had a similar experience with our system years ago. I would tend to agree it's one of the controllers. How old are they? Perhaps you want to consider one or more capacitors in the audio chain that have gone bad. Just an idea. Good luck in finding the solution. 73, Don, KD9PT - Original Message - From: Roger Stacey va...@telus.net To: Repeater-Builder@yahoogroups.com Sent: Friday, July 31, 2009 3:28 PM Subject: [Repeater-Builder] Challenging Interference First of all, thanks to all for reading. We have been chasing our tails for a couple of weeks trying to isolate an interference problem at our site. Any ideas would be greatly appreciated. We have a busy ham radio site. We have 2 RLC-4 controllers linked together by UHF simplex radios. A short discription: Controller 1 Port 1 = VHF repeater 146.64 Port 2 = UHF IRLP Link (simplex) Port 3 = UHF simplex link *(Linked together)* Port 4 = UHF link to controller #2 *(Linked together)* Controller 2 Port 1 =VHF Repeater 145.43 *(Linked together) * Port 2 =UHF Repeater 443.900 *(Linked together)* Port 3 =220 simplex link (223T02 224R62) *(Linked together)* Port 4 =UHF link to comtroller #1 *(Linked together) *_Problem Summary_ The problem is with the TX audio from Controller 1 port 3. whenever port 1 on controller 1 becomes active the audio bleeds through to the UHF TX audio on C1 port 3. The audio on C! port 3 is also distorted full time. The offsite repeater that C! port 3 is linked to is fine so long as the link is not being used. C1 port 3 is a new installation. Equipment is mainly Daniels and Tait. What we have tried 1. Adjusting audio levels in contoller - no joy 2. Unlinked all radios - result no change- C1 port 1 still bleeds through to C1 port 3 3. Ran another IMD study to the 5th order - no joy 4. Turned off all TX except C1 port 3 - problem still there - summized that interference not RF induced 5. Unplugged the DB9 connector on C1 port 3 and turned on it's TX - NO INTERFERENCE 6. We think that whatever is happening is in one of the contollers Our next step is to replace the 4066 quad bilateral switches tomorrow in each controller and see what happens. At less than a dollar each it's worth a try. Any thoughts or sugestions would be greatly appreciated. Right now I'm going to have a cool drink and repeat I LOVE REPEATERS 100 Times. Some pics http://www.ve7na.ca/gallery/v/repeaters Roger VA7RS Yahoo! Groups Links
Re: [Repeater-Builder] Challenging Interference
Don Kupferschmidt wrote: Roger, We had a similar experience with our system years ago. I would tend to agree it's one of the controllers. How old are they? Perhaps you want to consider one or more capacitors in the audio chain that have gone bad. Just an idea. Good luck in finding the solution. 73, Don, KD9PT - Original Message - From: Roger Stacey va...@telus.net To: Repeater-Builder@yahoogroups.com Sent: Friday, July 31, 2009 3:28 PM Subject: [Repeater-Builder] Challenging Interference First of all, thanks to all for reading. We have been chasing our tails for a couple of weeks trying to isolate an interference problem at our site. Any ideas would be greatly appreciated. We have a busy ham radio site. We have 2 RLC-4 controllers linked together by UHF simplex radios. A short discription: Controller 1 Port 1 = VHF repeater 146.64 Port 2 = UHF IRLP Link (simplex) Port 3 = UHF simplex link *(Linked together)* Port 4 = UHF link to controller #2 *(Linked together)* Controller 2 Port 1 =VHF Repeater 145.43 *(Linked together) * Port 2 =UHF Repeater 443.900 *(Linked together)* Port 3 =220 simplex link (223T02 224R62) *(Linked together)* Port 4 =UHF link to comtroller #1 *(Linked together) *_Problem Summary_ The problem is with the TX audio from Controller 1 port 3. whenever port 1 on controller 1 becomes active the audio bleeds through to the UHF TX audio on C1 port 3. The audio on C! port 3 is also distorted full time. The offsite repeater that C! port 3 is linked to is fine so long as the link is not being used. C1 port 3 is a new installation. Equipment is mainly Daniels and Tait. What we have tried 1. Adjusting audio levels in contoller - no joy 2. Unlinked all radios - result no change- C1 port 1 still bleeds through to C1 port 3 3. Ran another IMD study to the 5th order - no joy 4. Turned off all TX except C1 port 3 - problem still there - summized that interference not RF induced 5. Unplugged the DB9 connector on C1 port 3 and turned on it's TX - NO INTERFERENCE 6. We think that whatever is happening is in one of the contollers Our next step is to replace the 4066 quad bilateral switches tomorrow in each controller and see what happens. At less than a dollar each it's worth a try. Any thoughts or sugestions would be greatly appreciated. Right now I'm going to have a cool drink and repeat I LOVE REPEATERS 100 Times. Some pics http://www.ve7na.ca/gallery/v/repeaters Roger VA7RS Yahoo! Groups Links Yahoo! Groups Links The controllers are 4 and 5 years old. they also have DVR's and ADM's Thanks Don
