Message-ID: <5CB35457.9060303@posteo.de>
Date: Sun, 14 Apr 2019 17:40:07 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <477297345.20190414143742@gmail.com>
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Subject: Re: LF: Another impedance matching question. Paul's audio amps.
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Hi Chris,

What are you planning? Building a ground loop into your garden will be 
the only way to put that power into the antenna. At VLF and your E field 
antenna, you would have to deal with several 10 kV if you actually want 
to run > 1 kW. However on a ground loop, the amplifier will be the 
limiting factor :-)
How much space to you have between the electrodes? All you will need is 
a series C to resonate the antenna.
Use a big ferrite transformer to match the output impedance to the 
antenna impedance.
Always use a series C on the primary side of the transformer, if bridged 
or not, to avoid any damage due to an eventual DC-component.
Use a big ferrite core with just enough primary turns as necessary.
Now its time for Andy to post the formula again.

73, Stefan

Am 14.04.2019 15:37, schrieb Chris Wilson:
> Hello  LF'ers
>
>   Having  collected my audio amp from Paul Nicholson (VERY many thanks
>   Paul, it's an awesome looking beast.... :)) I would appreciate anyone
>   else getting one posting their thoughts and results matching the input
>   and  output for VLF usage.   Both for antenna and ground comms usage.
>   Thanks.
>
>