Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: VLF: New coil for 8270 Hz

To: [email protected]
Subject: Re: VLF: New coil for 8270 Hz
From: DK7FC <[email protected]>
Date: Thu, 29 Dec 2016 00:04:11 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
BTW Joe,

Would you set up a VLF grabber / monitoring station on your side to receive signals from DL? It is a bit easier i think, no pilot tones and such stuff. Direct reception with a simple soundcard. You will however need to build a preamp and low pass filters and such stuff...

73, Stefan

Am 28.12.2016 21:59, schrieb DK7FC:


Am 28.12.2016 19:00, schrieb [email protected]:
PS Stefan's coil is very compact. 0,4 mm wire? Hope it can take the kV!

Hi Joe,

Yes, 0.4mm wire. The voltage is not the problem for the wire. But the tube is out of PVC and the length of the winding is about 0.3m. So it will be about 1kV/cm which could be problematic if the inner side of the tube becomes wet, inhomogeneous wet. This could cause strong local E field strength which leads to arcing on the surface. Arcing on the surface makes the surface conductive, a self accelerating process that can be repaired. This is the high risk of this construction! It has its advantages and disadvantages. It will handle 700 mA RF current, at least now in winter :-) But i should take care to keep it as dry as possible. We will see what happens.

73, Stefan


<Prev in Thread] Current Thread [Next in Thread>