[time-nuts] Need info: Spectrum Instruments brand GPSDO

ed breya eb at telight.com
Sat Jul 28 19:48:44 EDT 2018

Thanks Thomas, for the link to the TM-4M. It appears the TM-4M is a much 
newer and fancier unit than these things. There may be some operational 
and HW similarities, but the ones I have are about twenty years old, and 
are clearly bigger (large single-board) than the dimensions of the newer 


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