As I recall, each PTO was individually temperature compensated
using a small N750 capacitor on the foil side of the circuit
board. Some are better than others. I improved my Corsair I
PTO by changing the capacitor. With a little bit if patience
and math these PTO's can be made really stable. The problem is
finding a source for N750 (temperature compensating capacitors).
I don't see them in the parts catalogs. With synthesizers, PTO
design has become a lost art, but you still find them in all
of the classic Drake, Collins, and of course, Ten Tec gear.
73, Bob WB2VUF
> So, I have this [new to me] Corsair 1, and I'm operating in a contest this
> weekend, when my 6-year old runs into the house yelling that there is going to
> be a volcano. As it turns out, she meant Tornado. Fortunately she was wrong.
> But, by the time I got back to the contest [many minutes later], the CQ'ing
> station I had parked on [with the 250 Hz filter in line] was still smack dab
> in the middle of the pass band. I was floored.
> Has anyone done any shack [field?] measurements of the stability of TT PTO
> controlled rigs? I would like to know what kind of stability others have
> seen. I would even like to know what kind of stability the synthesizer types
> are getting.
> The Corsair is a heck of a lot more stable than my TR7, although I wouldn't
> give up either radio.
> 73, Jim n0oct
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