Hello Mark (again) (sri for the 10000000s of emails from me tonite :-)
),
Maybe interesting to know, i've made 40 km distance on 8.97 kHz in
normal CW. Maybe 100km could have been possible if there were CW
listeners to that time in that distance and in a quiet location...
.wav file:
https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FCinCWon8970Hzthe33kmband.WAV
(23
MB)
But that was with a 300m vertical and 900 W RF power (350W average
power but a "booster" cap of 10x6000 uF / 350V for the PA :-) ) :-) .
73, Stefan
Am 25.06.2014 23:27, schrieb DK7FC:
Hello Mark,
200W in such a loop and 8.97 or 8.27 kHz, CW, my guess is that the
distance is less than 2 km. But it depends on the type of the RX
antenna (E or H field).
73, Stefan/DK7FC
Am 25.06.2014 18:47, schrieb [email protected]:
Hi -
I've been following the discussion
on
9 khz transmit antennas with some interest, as a friend of mine, Tom,
KD0VBR, has done some preliminary experimentation in this area ( using
large loading coils w/ vertical ). Tom asked me to post a query
regarding some antenna ideas he has, and it would be great to hear the
group's thoughts on them and whether they might work or not. 73, Mark
AB0CW
Below are his questions:
From:
"Pouliot, Tom" <[email protected]>
To: "Dittmar, Mark" <[email protected]>
Sent: Wednesday, June 25, 2014 8:51:48 AM
Subject: RE: LF: VLF in Canada - earth loop
Hi Mark,
That would be great if you could
post some questions about transmitting loops for VLF.
Thinking about a square loop 200'
per side 10' off the ground #8 wire with 200 watts into the antenna.
How far away could one expect to be able to detect a CW signal ? ( not
QRSS)
Another possibility would be a
triangular loop 200' per side with a 50' high apex.
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