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Markus
Valued commentary
as always. Plans are to continue making improvements in the
station.
What are your
feeling about the ground at 9 KHz?
Currently I am
using 3 2 meter ground rods spaced 2 meters apart and 1 meter
distant from the concrete basement wall of my shack.
This setup is not
optimum I understand and was never intended to be final ground system for my
regular ham station.
As a very quick
and crude test I pounded an aluminum pole into the earth 2 meters deep near the
9 KHz coil.
When this was
connected to the existing ground there was a very small increase in the current
meter.
Antenna system
impedance here is about 1250 Ohms with and antenna current of approx. 200
ma.
Lots of work to
do!!!
I will make
another post on grounds to the group as well.
Thank
you
PauLC
W1VLF
Dear Paul and Jay,
this is an excellent result, well done!
The crossover between reactive nearfield (E
~ r^-3) and farfield (r^-1) occurs at lambda/2/pi = 5.3 km. As
you seem to have quite a bit of margin there, your signal will be
detectable very significantly beyond that. Assuming otherwise equal
receive conditions, QRSS-120 should get you more than 6 times further than
QRSS-3.
Best wishes,
Markus (DF6NM)
----- Original Message -----
Sent: Friday, April 16, 2010 8:05
PM
Subject: Re: LF: Dreamers Band update
from W1VLF
Paul,
Great
work! Nice looking coil! How much power can you crank through
it?
At 5kM, I believe that you are still in the near field
(9kHz
wavelength is 33km), so signal will fall off at the 3rd power
of
distance until you reach far-field conditions.
--
73 Warren
K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
at 1:51 PM, Paul A. Cianciolo <[email protected]> wrote:
> Hello
Folks,
>
> Today we made our first outdoor transmission on
VLF.
>
> The system resonance forced the transmissions to take
place on 8890 Hz at
> least until I can get a variometer worked
up.
>
> The distance is only 5 KM but the signal is quite good
on QRSS3.
>
> I can only wonder how far the signal would go
using QRSS 120???
>
> Please comment if you can, this a great
learning experience for me
>
> Thank you
>
>
PauLC
> W1VLF
>
> http://www.rescueelectronics.com/9-Kilohertz.html
>
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