List: time-nuts@lists.febo.com
From: John Ackermann N8UR
Re: [time-nuts] Improving the stability of crystal oscillators
Wed, Oct 10, 2007 6:11 PM
The
standard crystals could almost maintain that tolerance in a nicely
regulated room, but we had these radios out in transmitter shacks in the
middle of corn fields, and with wide temperature swings the radio links
would die completely.
We first built a small proportional heater circuit that we could shove
in next to the crystal, and that worked OK.