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Re: LF: new VLF antenna at DK7FC

To: [email protected]
Subject: Re: LF: new VLF antenna at DK7FC
From: Stefan Schäfer <[email protected]>
Date: Wed, 24 Nov 2010 22:13:09 +0100
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Hi Roger,

Am 24.11.2010 21:43, schrieb Roger Lapthorn:
Hi Stefan,

I am unclear about the connection back to the shack. Are you using three wires (in the CAT5 cable) then to feed power, ground and signal back to the shack from the FET?
No, i use 2 wires. One is GND and the other one is between drain of the 1st FET and its 390 Ohm resistor.
No isolation transformers etc?
In the first attempt, so now, i am using no isolation transformer. Since i do not want to change the "official" grabber system but using the VLF grabber PC for the tests, i am using the internal soundcard of the PC (the official grabber uses a USB soundcard (5 Euro!)). This internal soundcard's GND is the GND of the PC and circuit, so no difference with an isolation transformer, just in this case!

Do you use this also on 136kHz and 500kHz with different filters?
Currently just on VLF but i plan to do some tests on 137 kHz as well. Will inform you about the results.

73, Stefan




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