Thread: Homebrew GPSDO
View Single Post
Old 6th Mar 2021, 12:26 pm   #17
Vintage_RC
Heptode
 
Vintage_RC's Avatar
 
Join Date: Sep 2018
Location: Twickenham, London, UK.
Posts: 536
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.
Attached Thumbnails
Click image for larger version

Name:	Quartzlock_2A_GPS_9s.jpg
Views:	152
Size:	45.0 KB
ID:	228372  
__________________
Alan G6PUB, BVWS
Vintage_RC is offline