[TenTec] OMNI SIX problems

[Steve Hunt]

For what it's worth .....

My Omni VI manual says to adjust R3 and R4 on the Tx Audio board (81597) for minimum carrier. These pots adjust the AC balance, and DC balance, respectively of U4 - the balanced modulator IC (CA3053E).

You might try the adjustment while listening to the residual carrier on another receiver. The problem with a VTVM or RF probe is that they are not frequency selective and so they could be measuring other signals emanating from the rig.

73,
Steve G3TXQ
  ----- Original Message ----- 
  From: OTAKEBI at aol.com 
  To: tentec at contesting.com 
  Sent: Monday, January 15, 2007 7:35 PM
  Subject: Re: [TenTec] OMNI SIX problems


  Bob, this is something you could probably do yourself but not only will you  
  need a VTVM but an RF probe and most of all the Ten Tec alignment process to  
  null the carrier.
  I don't think TT will give out that service information.
  Could be someone on the list has it.
  And, you might find that the carrier won't null in which case another  
  component has gone bad and you will need to track it down.
  Very seldom will a rig just go out of alignment all by itself unless you  
  replaced something in the circuit.
  You should not go about trimming any pots before checking  for that type of 
  problem.
  Dan/N4VET
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