[time-nuts] Spectracom 8161 "Standard Frequency Receiver - Oscillator" for WWVB (and question...)

[paul swed]

Hal and Magnus its pretty interesting. WWVB is indeed a skywave behavior
further out and at night. It exactly behaves like LORAN C and DCF and
others. But during the day I think it generally behaves like ground wave
from what I have experienced. What seems to be interesting is that the day
to day is somewhat repeatable. There was a NIST and HP document back in the
1960-70s time ( Think its in the hp vlf117 manual also)that talks about day
to day use for longer measurement periods. I was surprised by the details.
Also consider the time frame most oscillators were low stability back then
and the Cesiums were coming into play.
Fun history.
Regards
Paul

On Mon, Oct 5, 2020 at 8:18 AM Magnus Danielson <magnus at rubidium.se> wrote:

> Hi,
>
> On 2020-10-05 11:20, Hal Murray wrote:
> >>  On a WWVB setup you get 10’s of us ( yes microseconds) of movement at
> >> sunrise and sunset. You get as much as 10us between day and night.
> > Somehow, I was thinking that WWVB was ground wave and wouldn't be
> effected by
> > changes in the height of the ionosphere.  Am I totally out of it, or is
> 10s of
> > uSec just a lot better than the day/night shift you get with WWV?
>
> You will for sure see a mix of ground wave and ionspheric reflection,
> and those will vector sum. Depending on your distance your milage may
> vary. The same is seen at 77,5 kHz (DCF77) and 100 kHz (LORAN-C). The
> solar flare effect documented in the 8161 manual is for sure an
> ionspheric reflection effect.
>
> Cheers,
> Magnus
>
>
>
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