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Re: LF: Dreamers Band update from W1VLF

To: <[email protected]>
Subject: Re: LF: Dreamers Band update from W1VLF
From: "Markus Vester" <[email protected]>
Date: Fri, 16 Apr 2010 22:29:13 +0200
In-reply-to: <[email protected]>
References: <001201cadd83$a1ed53e0$0301a8c0@your91hoehfy9g> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
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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