You might check the LWCA homepage. It seems to me that there used to
be an experimenter located in Cedar Rapids, Iowa, USA, that operated in
the audio range and that he was a member of that group. I do not know
if he is still active or not. I'll check a recent edition of the Low
Down after a while and see.
You might also check out "cave radio" and spelunkers (Sp.?) pages. I
have read articles in the past about these frequencies. One thing that
comes quickly to mind is direct loop to loop transmission.
Also there is/was at least one navigation system operating at about 10
to 20 KHz. Omega operated a chain of transmitters and it seems that the
receiver compared phases betwixt transmitting stations and it was
something like every 8 miles the phase from a transmitter would go
through 180 Degrees. This is pretty much from memory.
I am drawing a blank about Consolan and Deca systems, but it seems they
were both low, low freequency.
Regarding your neighbors (not to mention their dogs), good advice would
be not to condust sonar experiments!
73,
Doc, K0HTF and longwave "D"
Iowa, USA, EN31dx
Christer Andersson wrote:
Hello Lowfers,
Today I received permission from the authorities to transmit between 7-8,5 kHz
with maximum 1kW out from the transmitter.
"The transmitter shall be designed according to the regulations in ITU RR App. S2
and S3."
Q: Is a vertical to prefer, even though it becomes very short in terms of
wavelength?
Will the neighbours complain about mechanical resonances in the antenna at
transmit?
What would be the theoretical/estimated range?
73
Christer
sm6pxj
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