[TenTec] Frequency accuracy...

[Martin AA6E]

When tuning SSB, I like to use 100 Hz or even 1 kHz
steps.  If everybody's oscillators were well adjusted,
we could use 1 kHz "channels" and make life easier,
especially with nets.  Apparently lots of folks do try
to use an even kHz setting, but you still need to use
a lot of RIT to "clarify" them. 

It won't happen soon, with all the old equipment out
there. To do the job right, you need accuracy of
better than say 20 Hz at all ham frequencies.

There are wonderful ways to synchronize with GPS,
Rubidium standards, etc.  But WWV is free and you've
already paid for the Rx.  An occasional tweak would
give the Orion at least +/- 0.2 ppm accuracy, which is
fine for HF.

73 Martin AA6E

--- Bill Tippett <btippett at alum.mit.edu> wrote:

> AA6E wrote:
>  >A different method.  Listen on 10 MHz in CW mode
> and
> press "spot".  You can easily hear the beat between
> your spot tone and the WWV carrier to +/- 1 Hz. 
> Right
> now, I get 9.999973 MHz, meaning that my TCXO must
> be
> 2.7 ppm high.
> 
>          Same method I use.  From a COLD start
> (shack temp
> ~60 degrees F), my unit went from 9.999967 to
> 9.999975
> in about 30 minutes, then back to 9.99967 after 2.5
> hours.
> That's a total deviation of 8 Hz, which is well
> within
> TT's +/- 3 ppm stability spec which is +/- 30 Hz at
> 10 MHz.
> My unit is 16 months old and has never been touched
> since
> it left the factory.  Unlikely I will recalibrate
> since
> the absolute 33 Hz offset is not worth the bother to
> me.
> Also, note that TT does not specify frequency
> accuracy,
> only frequency stability.
> 
>                                          73,  Bill 
> W4ZV
> 
> 
> 
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