[Hammarlund] Old Hammarlunds

[Kenneth G. Gordon]

On 9 Apr 2011 at 15:44, Chuck McGregor wrote:

> There was an earlier note on temperature compensating the SP-200
> printed in QST for Feb 57, page 58.

That amounts to adding only 3.3 pfd worth of TC capacitor with "as high 
negative coefficient of compensation as available" connected in parallel with 
the oscillator tuning cap, then realign.

Supposedly, this cut the drift down from well over 50 Khz, to 200 CPS.

Sounds simple enough.

Anyone know where one can get some negative 750 PPM, or 1500 PPM, TC 
caps?

Ken Gordon W7EKB