[time-nuts] ! PPS Source

[Hal Murray]

kb8tq at n1k.org said:
> The TBolt is a GPSDO rather than a GPS module. It’s a very different beast
> than a ZED-F9P.  ZED-F9T, or the  M-12 the OP is using. 

At least some GPSDOs contain a GPS module.  The Z3801A and friends are an 
example.

Are their any significant advantages to one way or the other?

I assume the TBolt approach is harder to do if you don't already have a 
software team writing GPS code.

How many major brands of GPSDO are there?  Does anybody have a list?  What 
fraction use a GPS module?


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