[R-390] 200KC calibration crystal source

[Phil M.]

>
> Taking the 17 MHz crystal out of the oven is not going to help the 
> stability of the radio much at all.
>

I don't think it will hurt the stability of the radio much at all either for
typical swl and amateur.  It is used only on the bands up
to 8 mc.  Many other fine receivers are quite stable with none of their
xtals in ovens.  Many of us use our  R-390A's with the ovens turned
off anyway.

thnks, Phil