Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: ELF communications ?

To: [email protected]
Subject: Re: LF: ELF communications ?
From: Markus Vester <[email protected]>
Date: Thu, 9 Oct 2014 12:35:50 -0400
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20140625; t=1412872550; bh=wk3cu9PPTSdKb1unazgvRCuTjR9nLLXoFvoXpDL0/kc=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=EQINKSqmSTJmAKxD+u11A4sk/bXnGPSmxLDVyxjlVfXgGrf6rMBpk8/bNDLOatotz /rBLqUX6iecGJxveR9vi5OZ5ELPhCJkR8sxMA24+1yWcljwwyPMq1s+kocWqrlQI6V vwdL2yns3NSZNxg4bRePcDIV+JaVnoQBb8Cs1XI8=
Reply-to: [email protected]
Sender: [email protected]
Stefan,
 
this could work. In the capacitive near-field range, the electrical field would be
 
 E = voltage * capacitance * effective height / (2 pi epsilon0) / distance ^3
 
With 10 kV on your antenna capacitance and height, you'd get about 0.15 mV/m at 2.4 km, maybe 14 dB stronger than ZEVS.
 
Take care! Touching 10 kV on 136 kHz will severly burn you. But on 136 Hz it would kill you, unless the current is safely limited to a few mA. 
 
73, Markus


-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Do, 9 Okt 2014 2:51 pm
Betreff: LF: ELF communications ?




Hi ELF, 

This afternoon i'm attempting to transmit on my INV-L on 136.172 Hz (not
kHz!). Just preparing my H bridge VLF PA and i intend to use an old 10
kV transformer which i got from an old furnance (to inflame the oil
stream), see
https://dl.dropboxusercontent.com/u/19882028/VLF/10kV%20Trafo.jpg

Will that work on 2.4 km distance? It's well inside the near field.
Which mode could be possible? QRSS-3? CW?
The 2200000 m band, or 2.2 Mm band :-) A near field of 350 km !!
I hope i can apply 10 kV to the antenna. It will not be resonated. And
maybe i will see harmonics as well, because the input is rectangular...

73, Stefan/DK7FC

<Prev in Thread] Current Thread [Next in Thread>