I bought a used 220 Maggiore Repeater a number of years ago and it had this
setup for xtal. temp. control on both the TX and RX xtals. Not sure the
manufacturer of the thermistors, but they look like what Bob is describing.
Roger W5RD
>If you're going to heat the crystal, might as well use something that will
>keep it at a more or less stable temperature: a 50 ohms 50 degree C PTC
>thermistor. Digikey has them for $1.68 each (manufacturer part #
>RL3006-50-50-25-PTO). Desolder one of the leads & solder the disk directly
>onto one side of the crystal, ground the crystal case & apply a regulated
>voltage to the other side.
>
>Bob NO6B
Roger White
Murphy, Texas
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