Re: Homebrew GPSDO
For those not familiar with the Quatrzlock 2A off air frequency standard I have attached a photo of my modified one. The meter shows the PLL control voltage and is thus a lock indicator. As mentioned in my previous post this is not a reliable indicator when used with the Jupiter GPS and you will see the LED labelled GPS OK which is driven by a PIC which is monitoring the GPS NMEA data. The switch selects between off air (198KHz) and GPS operation. Reassuringly I have never seen any difference in frequency between the two sources.
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Alan G6PUB, BVWS
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