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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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