actually you could transmit and receive on the same frequency if you
take care that they have different polarization. A small transmit loop
around -- vertical axis -- the building and very low power and receive
the wwvb normally with the ferrite roads with horizontal axis, the
transmission outside of the loop is negligible, I am running such a
system for my old clocks, wwvb receiver antenna properly oriented in the
attic, amplifier downstairs, the loop cca 1/2' from the ground an one
LM386 "drives" the loop with low power, just you have to turn you
clock's ferrite - antenna vertically.
73
KJ6UHN
Alex
On 12/26/2020 5:23 PM, Tom Van Baak wrote:
> Transmitting on the same frequency you are receiving on seems like
asking for troubles.
Same frequency, but you wouldn't do both at the same time. See, you
can't transmit AM WWVB until you first know what time it is. To get
the time you enable the ES100 and listen to BPSK WWVB. So the ES100
receiver and Arduino transmitter are not active as the same time. One
example might be to enable the ES100 for 3 minutes each hour and run
the Arduino for the balance.
> How far apart would the antennas have to be?
Use the standard dual right angle ES100 antenna setup to receive BPSK
WWVB. For transmit, you likely don't need, and legally don't want, an
antenna. The Arduino is likely within a few feet of the 24h RC clock
that you're trying to set. If it doesn't work first time, dangle a
jumper off the GPIO pin.
/tvb
On 12/26/2020 1:59 PM, Hal Murray wrote:
[email protected] said:
Use a ES100 board [2] to receive the real BPSK WWVB and then
generate a fake
AM WWVB signal for the 24h clock to receive. That way you get the
enhanced
reception of the new format and the wide clock selection of the
Transmitting on the same frequency you are receiving on seems like
asking for
troubles.
How far apart would the antennas have to be? How would you calculate
that
distance? Or what is the right question?
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