[sdiy] Coil osc's?

[Paul Perry]

I'll leave that to the ham radio guys to answer, but I do know that
mechanical rigidity and shielding is key (at least for RF)and the coil and
cap sometimes are arranged to have opposite & compensating temperature
drifts. But the surest method is the temperature controlled oven.

Some analysis here: 
http://www.electronics-tutorials.com/oscillators/oscillator-drift.htm

Paul Perry Melbourne Australia

>Whats the typical temp drift (ppm))of the classic tranny-coil based
>oscillators?
>(e.g Hartley, Colpits etc)