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Re: [TenTec] Omni 5 Feedback

To: <geraldj@weather.net>, "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Omni 5 Feedback
From: "Mike Hyder --N4NT--" <Mike_N4NT@embarqmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 28 Sep 2009 23:40:40 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Seems in my younger day what you describe was often caused by a bad cathode 
bypass capacitor.  Probably there are similar things that could go wrong 

73, Mike N4NT

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Monday, September 28, 2009 11:20 PM
Subject: Re: [TenTec] Omni 5 Feedback

> On Mon, 2009-09-28 at 15:15 -0400, Howell, D. Haney wrote:
>> My trusty Omni 5 has been under wraps for a few months.  When I fired it 
>> up
>> recently I experienced motorboating and rumbling feedback though the
>> speaker.  As the old hamfest saw goes, it was working fine the last time 
>> I
>> used it!  Any suggestions where to start troubleshooting?
>> Haney
>> k2xn
> Usually motor boating and rumbling feed back are a sign that the power
> supply bypass electrolytics have gone nearly open or have gone way down
> in value. That's not only the main power supply but the various supply
> voltage busses on the board.
> But for a first step, to make sure the board grounds are good, tighten
> all the PC board mounting screws. Then in Tentecs wiggle the cable
> connectors. Or pull them off and apply a tiny bit of DeoxIT to each pin.
> 73, Jerry, K0CQ

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