Some list members indicated a need for a well-controlled easily set frequency source. Another list I get has to do with software defined radio (softrock40). A member of that list mentioned a Maxim chip, the DS1077 oscillator/divider. The chip plus breakout board is close to ten bucks from Sparkfun. This chip will put out two frequencies and is I2C programmable. Over its temperature range, it is goodto +- 1.4% of its fundamental frequency.
Suppose one of the outputs is set to 10 MHz nominal. Now put a very small thermoelectric cooler stinger on it and put that in an insulated housing with heatsink outside. Connect a very simple comparator to your rock solid 10 MHz and the 10 MHz from the wonder chip. Hook this to a cheap PIC with suitable pwm to the thermoelectric cooler. Hey presto, a sort of OCXO with one adjustable frequency left. Can it work? I haven't time to try it now, but who knows... Don -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
