[time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

[Per Molund]

I have been using Chronvertor for years to simulate MSF transmission 
(from GPS source) since I am way outside the range of the British 
transmitter. However I am feeding the signal directly into the receiver 
so no problems with (un)intentional radiation.

According to the homepage 
<https://unusualelectronics.co.uk/chronvertor2/> the new model supports 
a number of protocols including  WWvB so it may be an alternative.

Regards,

Per

On 27.12.2020 16:30, Tim Shoppa wrote:
> Presumably any "rebroadcast" of WWVB is done in the spirit of near-field
> communications where any far-field radiation falls off like 1/r^3 from a
> small inductive transmitter loop.
>
> A loop the size of your entire house would be "small" in terms of 60kHz
> wavelength.
>
> Unintended coupling of the 60kHz into AC power mains or copper network
> wiring could result in the near field extending into places you didn't want
> it to go.
>
> Far-field radiation of 10 MHz signals unintentionally, is a helluva lot
> easier than radiating 60 kHz intentionally.
>
> Tim N3QE
>
> On Sun, Dec 27, 2020 at 4:33 AM Charles Steinmetz <csteinmetz at yandex.com>
> wrote:
>
>> Hal wrote:
>>
>>> Transmitting on the same frequency you are receiving on seems like
>> asking for
>>> troubles.
>> Difficult perhaps, but not impossible.  As /tvb notes, one solution is
>> time domain multiplexing; and, as Alex says, phase domain multiplexing
>> is another (although the phase discrimination of 60kHz antennas this
>> size is problematic).  There are others.
>>
>>> How far apart would the antennas have to be?  How would you calculate
>> that
>>> distance?  Or what is the right question?
>> I've watched discussions of this topic for several years, and have
>> always been surprised that nobody has ever once mentioned the potential
>> for harmful interference extending beyond one's own property.  (Tom
>> mentioned it today, including the possibility of legal implications.)
>> This is especially true of people, like some on this list, who
>> reportedly run a big loop around their house ("so that all their WWVB
>> clocks can hear it").  But really, any scheme with leakage can (and
>> likely does) create harmful interference beyond your property.
>>
>> I can say positively that if anyone who has such a system lived down the
>> block from me, I would be most unhappy about it and would be in a very
>> foul mood by the time I figured out what was causing the interference I
>> was receiving.  (I know whereof I speak -- I spent quite a lot of effort
>> a few years ago chasing down a leaking 10MHz reference of very dubious
>> quality in use by a local ham nearly a kilometer from me.)
>>
>> So, please, if you are going to rebroadcast a time signal to your
>> receivers, make sure the modulator and RF generator are in
>> well-RF-sealed enclosures and that you use good coax (or, preferably,
>> triax) to send the signal to each receiver individually.  BTW, this
>> applies to *any* such signal, not just LF but HF and GNSS rebroadcasters
>> as well.
>>
>> Best regards,
>>
>> Charles
>>
>>
>>
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