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Re: LF: VLF Small magnetic antenna for Tx

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: VLF Small magnetic antenna for Tx
From: DK7FC <[email protected]>
Date: Sat, 03 Feb 2018 17:57:44 +0100
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In-reply-to: <23159F1ED5BD49AD9654CE5685AFACF6@Clemens0811>
References: <579355A36AEE9D4FA555C45D556003AB9AB485D3@servigilant.vigilant.local> <[email protected]> <[email protected]> <23159F1ED5BD49AD9654CE5685AFACF6@Clemens0811>
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Or here: https://de.wikipedia.org/wiki/Nahfeld_und_Fernfeld_(Antennen)#Nahfeld 
73, Stefan

Am 03.02.2018 11:24, schrieb Clemens Paul:

Hi Jim,


At 38kHz the impedance of the transmitting loop’s field at 100
meters is ~ 25 ohms,

I've found a graph showing Z_Wave over D/ʎ.
Near the loop: Z_wave = 377*(2pi*D) / lambda

73
Clemens
DL4RAJ



-----Original Message-----
From: [email protected]
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Sent: Thursday, February 1, 2018 11:22 PM
To: [email protected]
Subject: RE: LF: VLF Small magnetic antenna for Tx
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