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I just read through the ProgRock manual and it looks like using the OCXO oscillator with the ProgRock and the GPS will get you close, but it doesn't look like it will be real "Lab Grade" but will be close enough for most ham radio stuff. ?It can be programmed to correct the output every 1 pps from the GPS module, but that could give you a continuously varying (by 1 or more Hz) output frequency from the ProgRock. ?If you can live with that variation, I'd think it would be okay, but if you were doing an ARRL FMT (frequency measuring contest), it probably wouldn't be accurate enough. ?That's just my take on what I skimmed quickly from the ProgRock operation manual. ?Hans might have something different to say about this if/when he gets time from his busy schedule to chime in.

Jim - W0EB