Re: [drakelist] Cooling Fan on finals

[K9SQG]

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Not sure I understand that comment about the drift, hi hi.  The drift is a 
function of the thermal environment with respect to the PTO components, 
including any negative temperature compensating capacitors.  While the transmitter 
will "work", it will have a warm up period, and then cycles up and down as a 
function of the transmit duty cycle.  Compensating for the former is enough of an 
engineering challenge, but the latter, for tube gear of the 60s, well, it is 
harder to address although there were some good designs out there.  From a 
theoretical perspective, I'm not sure why the rig would run better when it is hot. 
 A temperature compensated crystal oven obviously works better at higher 
stabilized temperature (above room ambient) but conventional circuits, well I'm 
not sure.  Drift aside, the tubes will last longer with improved cooling though.



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