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Re: LF: VLF Small magnetic antenna for Tx

To: "[email protected]" <[email protected]>
Subject: Re: LF: VLF Small magnetic antenna for Tx
From: Jacek Lipkowski <[email protected]>
Date: Sat, 3 Feb 2018 21:36:15 +0100 (CET)
In-reply-to: <579355A36AEE9D4FA555C45D556003AB9AB4958F@servigilant.vigilant.local>
References: <579355A36AEE9D4FA555C45D556003AB9AB485D3@servigilant.vigilant.local> <[email protected]> <[email protected]> <23159F1ED5BD49AD9654CE5685AFACF6@Clemens0811>,<[email protected]> <579355A36AEE9D4FA555C45D556003AB9AB4958F@servigilant.vigilant.local>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Alpine 2.11 (DEB 23 2013-08-11)
On Sat, 3 Feb 2018, VIGILANT Luis Fernández wrote:

Jacek, you mentioned what I was midnight oiling here
" If you want some semi-DX in the H-field, then try coupling into some long
conductors (pipes, power lines, railway tracks etc)"

And i forgot phone lines :)

Actually there has been a 700m phone line, that was well grounded at the phone exchange (old exchange, no local modules were used, so the wire went all the way there). This makes a nice ground dipole when a transmitter is placed between the local ground and the grounded wire from the phone line. Putting abt. 30mA at 8.97kHz (this was when 9kHz was the ITU limit) gave a very nice signal 600-700m from the phone line.

What about coupling the loop to my 90m vertical ?
Adding another transformer from loop to vertical or just winding some coils of 
the vertical over the
small loop ring would work ?

No, because the amount of current induced in the mast would be very small.

BTW i wish i had a 90m vertical.

VY 73

Jacek / SQ5BPF
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