GPS locking using PROGROCK LO synthesisers

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Dave

Just been reading through the JF2 Hardware User Guide and discovered :
"By default, the JF2 module communicates using NMEA at 4800 baud, with the periodic output messages limited to the GGA, GSA and RMC messages at once per second and the GSV message once every five seconds."
That may not be important to you but it would provide Lat/Long info to do conversion to grid square by adding a micro to the module's TX line, useful when FDing.

The ebay listing you linked to shows "1PPS, when GPS module get location, it will output 1PPS signal every 1 second. The signal is active high 100ms pulse" so lets hope that it is correct if you need that wider clock pulse.

You could always use the 1PPS out from one of the other rejected units to trigger a 100-500mS monostable (your pulse stretcher) to lengthen the pulse.

I may even grab one or two myself once I see your next report about them.