Yep, it drifts. Best to tune that one by hand in my opinion. G0MRF addressed it 
in an email to the -bb a while ago if I recall correctly. 

73, Drew KO4MA

Sent from my iPhone

> On Jan 10, 2014, at 4:26 PM, "Peter Wilson" <[email protected]> wrote:
> 
> Hi all,
> 
> 
> 
> I'm having great fun on all the operational satellites, including AO-73.
> 
> 
> 
> However, I find that even using CAT control I have to adjust the uplink
> frequency almost constantly throughout the pass.
> 
> I have to shift buy about 3500Hz overall from start to finish, increasing
> all the time.
> 
> 
> 
> Is everyone else seeing the same effect?
> 
> 
> 
> Peter
> 
> G8KEK
> 
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