I started using WWVB in 1970 in Houston working for TI using a Tracor Omega 
receiver. Modified it for 60 KHz and used it for 40 years.  TI liked what I did 
and I modified quite a few for their Cal Labs in the US and Europe. Got a award 
and could keep all the extras. In those days TI was still in Oil exploration.
Houston OCXO, on moving to Dallas buried an OCXO 20 feet in the ground, later 
purchased a FRK (over 3K).  Two years later added temperature control and a 
year later a 12 bit blue Philrik DAC that I ran with a 3 MHZ Collins TCXO. 
Adjusted it once a year and only once did major change because I moved in 93 to 
Miami.

When I got my first Austron Loran C it was in parts E-13. Continued using it 
till the FRK died in 2010. The only bad thing was that you could hear the 
mechanical counter throughout the 2 story house day and night. Visitors did not 
appreciate it.
Bert Kehren
 
In a message dated 8/30/2018 2:03:49 PM Eastern Standard Time, kb...@n1k.org 
writes:

 
 Hi Same basic problem with WWVB. If you were using it as a reference, you 
timed your data collection to avoid the transition periods. You got both phase 
shifting and the amplitude took a dive. Neither one was going to help you make 
a precision measurement. In addition there are various weather events 
(terrestrial and solar) that can get into the mix. You can see blips here and 
there that do not correlate with the sunrise / sunset stuff. Again, not a big 
deal if you are manual evaluating the data to check your local Rb standard or 
super duper OCXO. Not a good thing for disciplining a system 24 hours a day 365 
days a year. Bob > On Aug 30, 2018, at 1:54 PM, Attila Kinali 
<att...@kinali.ch> wrote: > > On Thu, 30 Aug 2018 12:27:12 -0400 > Bob kb8tq 
<kb...@n1k.org> wrote: > >> WWVB as transmitted ( = right at the input to the 
antenna) is a wonderfully stable signal. As soon as >> that signal hits the 
real world things start to degrade. Propagation between transmit and receive 
sites >> is a big deal, even at 60 KHz. On top of that, there is a *lot* of 
manmade noise at 60 KHz. The receive >> signal to noise will never be as good 
as you might like it to be …. > > I don't know about WWVB, but for DCF77 it's 
known that sunrise/sunset > causes a phase shift of several 100µs at even 
moderate distances > (like ~500km). Unfortunately I don't have any measurements 
at hand. > > > Attila Kinali > > -- > It is upon moral qualities that a society 
is ultimately founded. All > the prosperity and technological sophistication in 
the world is of no > use without that foundation. > -- Miss Matheson, The 
Diamond Age, Neal Stephenson > > 
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