Thread: Homebrew GPSDO
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Old 6th Mar 2021, 11:26 am   #17
Vintage_RC
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Join Date: Sep 2018
Location: Twickenham, London, UK.
Posts: 316
Default 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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