[time-nuts] WWVB SDR discussion

[David I. Emery]

On Tue, Aug 11, 2020 at 10:27:33PM -0400, paul swed wrote:

> Just saying they work for all those atomic clocks for $10.

	Those don't give a damn about 60 KHz delay/phase provided it
doesn't change very fast (as it wouldn't due to thermal effects).

	But monitoring frequency or drift of an oscillator by comparing
it the 60 KHz WWVB carrier through the filter would show frequency and phase
shifts due to the thermal shifts.   That would result in false indications
of drift and instability and certainly cause issues with anything that
depended on deriving exact time to way closer than a second from the signal.

	(And yes ionospheric shifts are real and of this magnitude too).


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."