[TenTec] drift

WA3FIY WA3FIY@radioadv.com
Mon, 2 Sep 2002 10:43:44 -0400

If the display is not indicating drift and if the received signal is 
not drifting, then I would suspect something in the transmit 
carrier oscillator [BFO circuit].   

The digital readout displays the premix signal which is composed 
of the PTO and High frequency crystal oscillators.   So you can 
pretty well rule those out.   The BFO frequency is changed 
between receive and transmit so that is where I would focus my 
attention.  Perhaps a realignment of the BFO is in order.   The 
problem might show up in the process.

That last digit jitter in your display is a common occurrence in 
frequency counters and does not normally indicate any problem 
unless the last digit jumps more than one count.   It occurs 
because the count gate is not synchronized to the incoming 
signal.  Some modern frequency counters based on 
microprocessor technology have pretty much eliminated the last 
digit jitter.

Good luck.


On 2 Sep 2002 at 9:15, KMerzel@aol.com wrote:

> Hello All:
> I have been told that my corsair II has a tendency to drift down a bit
> during a cw qso. The other end can still copy. On my receiver there is
> no drifting of the audio noticeable. The only thing that jumps a bit
> is the last digital column-the 100 Hz. This has always been jumpy on
> recieve for me but again, the received audio has no drift. Any
> suggestions. 
>                                    73
>                                    Ken  N2XY
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