Date: Sun, 7 Apr 2019 12:49:15 +0200 (CEST)
From: Jacek Lipkowski <sq5bpf@lipkowski.org>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: ULF: EbNaut message transmitted from ground loop
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On Sun, 7 Apr 2019, DK7FC wrote:

> An OM (OT!) of my radio club told stories of his early radio experiments. He 
> had a friend in some 100m distance and they lay out a small hidden wire into 
> they ground between their QTHs, using the earth as the back 'wire'.

Some electricity (i think they didn't call it electronics back then) hobby 
books for boys in the USA has descriptions of using ground dipoles for 
telegraphy. The transmitter was a buzzer-like circuit with step-up 
transformer, and the receiver was just high impedance headphones. 
Unfortunately i don't have the book, but i remember it also showed how to 
make a rhumkorff generator from a ford t ignition coil, so it must have 
been very old.


I also remember reading somewhere that during the war (not sure it was WW 
II) using amateur radio equipment was prohibited, and the ARRL advised 
using similar equipment, so that people don't loose their operating 
skills.

No doubt some people used much larger ground dipoles than advised in the 
books :)

VY 73

Jacek / SQ5BPF