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To: tentec@contesting.com
Subject: [TenTec] OMNI VI PLL FIX
From: Markus Hansen <mkve7ca@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 16 Nov 2012 10:43:15 -0800
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
OMNI VI Problem fixed.

Recently my OMNI VI+ began behaving erratically.  When listening to a signal, 
all of a sudden it would quickly drift off frequency and then there would be no 
receiver output.  Turning the transceiver off and then on would usually fix the 
problem but one day there was no received signal when I switched it on even 
though the digital display showed the correct frequency and turning the VFO 
caused the frequency to change

I suspected the 5.0-5.5 MHZ PLL was the problem so I checked the output at 
connector #85 of the PLL Board (81599) with my scope.  The output level was 
very low (-5dBm instead of +17 dBm) and the output frequency was in the 9 MHZ 
range.  I began poking around and found out that if I squeezed the tin 
enclosure surrounding the VCO, the output would jump to the correct freq.  The 
tin enclosure is soldered to the PC board in two places and one of the 
soldering joints had come loose from the PC board.  I carefully resoldered it 
and also added two more solder joints from the tin enclosure to the ground 
plane of the PC board.  Problem fixed.

By the way I had called the service department at TEN TEC and a gentlemen told 
me they did not have an exchange program for OMNI VI  boards.  I would have had 
to ship the whole transceiver to them for repair.  

Markus Hansen VE7CA
North Vancouver, BC  CANADA
WEB:  ve7ca.net

Markus Hansen VE7CA
North Vancouver, BC  CANADA
WEB:  ve7ca.net

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