Mal,
That's fine! So you could use 1mm diameter enamelled wire for minimal losses.
Also the HV will be rather smaller. Sounds promising...
73, GL
Stefan/DK7FC
________________________________
Von: [email protected] im Auftrag von mal hamilton
Gesendet: Sa 15.05.2010 14:34
An: [email protected]
Betreff: Re: LF: ref LD30
Stefan
My Loading coil inductance at 137 is around 0.5mH therefore at 9 kHz it should
be roughly 116 mH. Not such a big coil in my case.
Tnx info de Mal/g3kev
----- Original Message -----
From: Stefan Schäfer <mailto:[email protected]>
To: [email protected]
Sent: Saturday, May 15, 2010 1:07 PM
Subject: Re: LF: ref LD30
...means L(9kHz) = L(137kHz)*232
Am 15.05.2010 13:52, schrieb Stefan Schäfer:
Mal,
I assume you know your antenna capacitance so you can easily calculate
your needed inductance. Or, if you know your L for 137kHz, it will be about
(137/9)^2 at 9 kHz!
Stefan/DK7FC
Am 14.05.2010 20:35, schrieb mal hamilton:
Well, I am getting 15v sine wave into a 50 ohm DL with the
LD30, this looks promising. All I need now is a 500W audio amp suitably matched
into 50 ohms.
I prefer to keep a standard 50 ohm system for measuring purposesd.
or
I could change the 15v to sq wave and build a class D fet amp,
maybe a better approach.
If I proceed the Ant system would consist of 3 x inv L antennas in
parallel, height about 100 ft and each one about 500 ft horizontal.
Will have to calculate the loading coil L maybe less than 1 H with
some luck
This is just a proposal at present
de mal/g3kev
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