[time-nuts] GPS-disciplining an ordinary VCXO?
albertson.chris at gmail.com
Mon Sep 29 16:23:44 EDT 2014
> Nowadays you can get a great 10MHz OCXO on Ebay for $10, buy a
> PLD/FPGA/Micro eval board for less than $30, and add a DAC and some
> low-pass filtering
> and voltage reference for probably less than $10. So you can do a
> complete, high-end double-oven GPSDO for around $50.. Adding the Crystek
> VCXO onto....
If you are thinking of using a VCXO then you are not thinking of building a
high-end GPSDO. This means you can use cheaper parts all around. A $2
micro processor and you can use the ADC and DAC that is built into the
micro controller. There was a schematic posted here some time ago. I got
it and was able to build a GPSDO for under $8 total. The trick is to do
everything with the uP.
Redondo Beach, California
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