Although not advisable a search of the Internet will turn up several.
There is a well know Raspberry PI version. The range of the transmitters
is only a couple of feet so if placed next to your clock it will work.
Anything that would cover your entire house would certainly not be
advised.
There is also a smart phone app that does the same thing. It uses the
phone speaker somehow to generate a harmonic (probably 3rd of 20 kHz).
The watch or clock has to be placed next to the phone speaker for it to
work.
Ray, AB7HE
On 2021-12-11 06:43, Attila Kinali wrote:
On Fri, 10 Dec 2021 15:54:55 -0500
"Lawrence Brandt" <[email protected]> wrote:
Has anyone designed and/or sold a "WWVB repeater" device? I can
picture a
Raspberry Pi which had software to get NTP data or GPS-referenced
time, and
a small 60 kHz transmitter, which would send the proper WWVB timecode
data
to the several "atomic clocks" I have around the house.
Today, with all the non-licensed wireless stuff we have as
gadgets, it doesn't seem to be as obvious as it once was, but:
Transmitting on a frequency you don't have the explicit license
for is forbidden. And there are some quite hefty fines for that.
Especially transmitting on a widely used frequency of an
infrastructure service like WWVB might not be looked kindly upon.
If you want to lock WWVB clocks that are placed somewhere, where
the reception is not good enough. Then you should inject the signal
directly into the clock. This way you avoid transmitting.
Alternatively, replace the electronics with some 802.15.4 system
(e.g., 6LowPan) and distribute time in this network. There are
plenty of developer boards available for this kind of stuff,
just check adafruit and sparkfun.
Attila Kinali
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