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Finally AirSpy.us has confirmed my order of a cable that I can use for syncing my AirSpy SDR to GPS.... Don't know when it will arrive.. I seem to remember some one posting a comment about it did not make much difference. Will try it... Not sure yet how I will measure the phase noise.............
Marcus D. Leech
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Sep 26, 2025, 12:42:37 AM (7 days ago) Sep 26
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On 2025-09-26 00:41, 'Stephen Arbogast' via Society of Amateur Radio
> -
For simple hydrogen observations, a GPSDO will make essentially NO
difference in sensitivity over the TCXO that is on-board the AirSpy.
Stephen Arbogast
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Sep 26, 2025, 12:54:17 AM (7 days ago) Sep 26
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Yes, I am still thinking phase coherent stuff.
Stephen Arbogast
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Sep 27, 2025, 7:58:08 PM (5 days ago) Sep 27
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Running my AirSpy R2 with GPSDO and yes no difference but if one has their SDR outside subject to temp variation.... this is interesting .