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 <[email protected]>
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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