[TenTec] Ten Tec; They make one heck of a solid state PA

[Rick - DJ0IP / NJ0IP]

Mike, your story was not PC.
It did not begin with "do not try to do this yourself at home"  (Hi)

73
Rick, DJ0IP

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Mike Bryce
Sent: Sunday, September 30, 2012 8:10 PM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] Ten Tec; They make one heck of a solid state PA

Boys and girls,

last night I was just about to button up a Omni V I have been working on.
Doing a calibrate on the internal power out meter and verify the SWR was
reading correctly..

I placed the Omni V in 'tune' and with the output into my cantenna, I
started to do check the calibration.

Then I was distracted. Don't know by what or for what reason, but i found
myself sitting in front of the TV watching a movie. After the movie was
over, my wife said she smelled what she said was the oder of paint. 

Running into the room, the smell of hot paint rushed into my nose. 

I looked down and the Omni V was in transmit, 100 watts showing on the bird
thruline. The dummy load was almost on fire, oil bubbled out of the pressure
valve. The heatsink on the back of the radio was so hot the entire rear of
the radio was too hot to touch! The paint smell was from the top and rear
apron of the rig.

I grabbed a muffin fan and quickly had it blowing air across the rear of the
rig. 

It took almost an hour to cool the rig down to the point I could touch it. 

Thinking I just screwed up big time, I wondered if any of the parts inside
the PA had un-soldered, I dug out another dummy load, held my breath, and
pushed the 'tune' button.

Up she came, 100 watts on all bands.

Damn...

The Omni V was keyed for over two and half hours and while hotter than hell,
suffered no ill effects. That's a statement of a well designed solid state
amplifier.

And on a side note, the MFJ "cube" switching power supply I use on my
service bench held up as well. It's too was at the melting point,

I remember when W8AU left his Triton 4 in keydown inside his car for an
hour, it too survived.

Could have been worst. A lesson learned. Battery replaced in smoke detector
in shack.

mike wb8vge


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