Here is a project which mixed the Time Kube IF output back to 10 MHz for
use as a frequency (not time)
standard:http://schematicsforfree.com/archive/file/Oscillators%20and%20Generators/Misc/10Mhz%20Frequency%20Standard%20Using%20Wwv.pdf
I believe that the Time Kube uses a 3-transistor mixer / 455
On 12/7/17 1:29 PM, Bill Hawkins wrote:
So yes, this could be interesting for a hobbyist, but it won't add
anything to Science.
A MASER is overkill. Heck, so are Rubidium and Caesium.
A naked crystal will be rock solid compared to received WWV.
OTOH, NTP has marvelous mathematical tricks to
martin.burni...@burnicki.net said:
> Hm, this file is part of the standard NTP source code package available
> here: http://support.ntp.org/bin/view/Main/SoftwareDownloads
Argh. Good catch. Thanks.
I knew that it came from the ntp package. I thought it was stand alone but
it seems to use
Hal Murray wrote:
>
> kb...@n1k.org said:
>> To get the accuracy into the 1 ms range on WWV, you would need a pretty good
>> idea of the path length between you and WWV.
>
> Dave Mills has a program to compute delays.
>
> * By default it prints out a summer (F2 average virtual height 350 km)
kb...@n1k.org said:
> To get the accuracy into the 1 ms range on WWV, you would need a pretty good
> idea of the path length between you and WWV.
Dave Mills has a program to compute delays.
* By default it prints out a summer (F2 average virtual height 350 km) and
* winter (F2 average
I have done some frequency measurement testing of WWV transmissions against
a not that great reference. Results are shown on
https://sites.google.com/site/perseusmods/home/performance
They are pretty awful even compared to a not that great reference. The
Ionosphere is not friendly.
Mark
W7MLG
The timecube radios were simple superheterodyne AM receivers. I suspect the
group delay of the timecubes will be small and fairly consistent due to the low
component count,
Yet because of the low quality components performance variability between units
will be quite high.
A more
Hi
If you happen to pick 5 or 10 MHz as your target frequency, all sorts of
interesting
things come into play. The first is that any 5 or 10 MHz local standard
distribution
may well get into your receiver. That can create all sorts of odd effects as
the signal
fades. Next is that you aren’t
One way to compare any WWV receiver to a local standard is to use the
PPS output of a standard against the PPS tick modulated on WWV. The tick
is five cycles of a one KHz signal derived from the master frequency.
See
https://www.nist.gov/pml/time-and-frequency-division/time-services/wwv-a
Pat
Way back in the 90s I measured the color subcarrier frequency of
geostationary satellites. That aren't actually stationary.
I knew the quality of the subcarriers for a number of the networks since we
originated the signals. CBS was Cs others were Rb and still others various
Xtals. I had direct
Hello Friends,
I am picking up locally a couple of vintage analog Radio Shack SW time cube
radios, 70s vintage, 3 switchable SW frequencies. Two types, the one
pictured and a Radio Shack model also that has WWV and Weather channel VHF
frequencies.
I am interested in an accurate bench test to
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