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Repeater Noise

The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!

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kb3awq
Posts: 35
Joined: Sun Feb 05, 2006 11:17 am
What radios do you own?: Kenwood and Motorola and Icom

Repeater Noise

Postby kb3awq » Fri Jun 01, 2012 12:08 am

This may have been asked before but due to the nature it seems to be difficult to search for.

The problem was first noticed when there was fan noise when the fan was running. When the fan is not running it is quiet. I was doing some trials and when you tap on the repeater case or even the radio it picks up these taps and put over the air when the repeater is transmitting. What is the cause of this and what would be the cure? This is a GR1225 repeater. This happens whether the mic is plugged in or not.

As a 2nd question..... I actually have had a similar issue when a 2 meter repeater that was hooked up by a local dealer using 2 Kenwood TK-762 mobiles but this actually only happens of the microphone is plugged in.

Thanks!
John W. Springman III - KB3AWQ.com
GMRS - WQGU515

Al
Posts: 1045
Joined: Tue Sep 04, 2001 4:00 pm

Re: Repeater Noise

Postby Al » Fri Jun 01, 2012 5:25 am

Try searching this board on +microphonic + repeater. Sounds like something is causing the transmit VCO to shift frequency in accordance with mechanical vibration.

User avatar
Bill_G
Posts: 3087
Joined: Thu Sep 17, 2009 5:00 am

Re: Repeater Noise

Postby Bill_G » Fri Jun 01, 2012 5:34 am

Tear it apart, clean the connectors between the boards, reassemble it, align it, see what happens. It's not an unknown problem, but it can be tricky to resolve sometimes.


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