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" <[email protected]> >To: <[email protected]> >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
