[time-nuts] Re: local WWVB ?

[rcbuck at atcelectronics.com]

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" <lawrence.brandt at gmail.com> 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