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Re: ULF: A next step for 970 Hz

To: [email protected]
Subject: Re: ULF: A next step for 970 Hz
From: DK7FC <[email protected]>
Date: Mon, 13 Nov 2017 22:13:06 +0100
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Hi Edgar,

nice to read from you.
I thought about you today and asked myselfe what could be your current situation regarding VLF reception (?)

Am 13.11.2017 21:36, schrieb edgar:
Hi Stefan,

Interesting, are you aiming for a high Q coil,
Well, you can call it high Q but in the first way the aim is a high L that holds a high voltage. I need 56 H at that frequency, quite an effort for hand wound air gapped coil :-)
With that load of material i can do many interesting experiments below 4 kHz...

If so what is the best geometry for the coil for that frequency?
So far i took a mofied mains transformer which has a 1 mm air gap and 0.5 mm plates. At 5 kV / 15 mA antenna current it became quite warm already. To make the next distance step i need 10 dB QRO or so. In the end i should reach at least 30 kV, then i think Paul and DL0AO will be able to receive me. No, no calculations!

73, Stefan

Regards, Edgar
Moonah, Tasmania.

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