[TenTec] Carrier null on Omni VI; SSB switching transient

[Bob McGraw - K4TAX]

Since the carrier null is different between LSB and USB, this would suggest 
that the BFO is not properly positioned on the slope of the TX SSB filter. 
The attenuation of the filter contributes to the carrier null.

A frequency counter is required to properly perform this alignment or to set 
the BFO frequency.  Once the BFO alignment is correct then an oscilloscope 
can be used to observe the actual carrier level in the output.  The 
adjustment can be made and you can see that the carrier null is equal 
between LSB and USB.  This will likely cure the switching transit you 
describe as well.

The manual covers all of these adjustments and the required equipment to 
perform same.

73
Bob, K4TAX


----- Original Message ----- 
From: <W5OT at aol.com>
To: <tentec at contesting.com>
Sent: Wednesday, April 01, 2009 5:37 PM
Subject: [TenTec] Carrier null on Omni VI; SSB switching transient


> My Omni VI has a small bit of carrier showing on LSB that is not present 
> on
> USB.  Also there is a full output switching transient when I key the mike 
> in
> LSB; it is less than half on USB.
>
> Can this alignment/null be performed with a minimum of test  equipment?  I
> don't have a service monitor capable of 1 Hz readout.  I  seem to remember 
> some
> discussion on the switching transient a few years ago, so  I will try to 
> check
> the archives.
>
> 73, John
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