I use that Lyle K0LR style thermistor crystal heater in my freq counter. It has maintained better than 1hz stability for over a year now.
Mike
WE0H
Charlie , W5COV wrote:
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I built my 10.140 MHz. oscillator on a very small board separate from the transmitter . I soldered a thermistor to the crystal to maintain a constant temperature . The entire board is then encapsulated in a small container and filled with thermal conductive epoxy .Only the leads for hookup to the transmitter come out of the package .
I haven't yet had time to run many tests with it . I'll post my results once I can run it for a few days under different temperature conditions .
Charlie , W5COV
