Re: LF: Active loop antennas

To:	rsgb_lf_group@blacksheep.org
Subject:	Re: LF: Active loop antennas
From:	Chris Trask <christrask@earthlink.net>
Date:	Mon, 16 Apr 2018 17:21:09 -0400 (EDT)
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     That's an intersting and simple design.  I have only found a few specs for 
that 1NA217 device, but even those are impressive in terms of THD and input 
noise voltage.  Since it is good up to 800 kHz it's well suited for LF and 
below.

>
>I'm running this pre-amplifier attached to a single turn loop, an 
>equilateral triangle with 10 metres of circumference (~13 uH). C1 (150nF 
>here) is needed to block "KIL" (NDB, 353 kHz) at 800m of distance.
>

Chris Trask
N7ZWY / WDX3HLB
Senior Member IEEE
http://www.home.earthlink.net/~christrask/

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