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[TenTec] tripped up... or down, as the case may be

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Subject: [TenTec] tripped up... or down, as the case may be
From: Jim Goudie <jagoudie@comcast.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 17 Jan 2011 16:10:21 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Hello all,

A tale of misfortune and fortune.  And before I decide which way to go, I 
thought I'd check and see if the symptoms  ring any bells out there...

I was on the air with my Omni VI opt 3...  I was switching bands fairly often, 
and the last switch was to 160.  I set the tuner, which for 160 produced a 
rather sharp null.  When I keyed the rig, the breaker tripped.  That's odd, I 
thought.  I hadn't tripped the breaker like that in many, many moons.

Shortening the story, after resetting the breaker, I found it would trip as 
soon as the output power got up over a watt or two....  And it did it on 80 
meters... and 20 meters without the tuner in line.  I shut down for the night.  
Today, going into a dummy load, it put out power until about 50 watts out, and 
then the needle on the power meter went erratic, but the breaker never tripped.

The side story & symptom are that last night, after fooling around, I realized 
the rig wasn't receiving any signals.  This morning, when I first turned it on, 
it received ok.  But, after doing my dummy load testing, the received signals 
were gone again.

So... I pulled my trusty 544 off the shelf to replace the Omni VI at my 
operating position... and operated for three hours with that.

I'm guessing the problem lies in the SWR-sensing, tx-rx switching stuff in the 
output...  I haven't cracked it open or even looked at the schematic yet...  
Any thoughts?

Jim, AF3Z
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