[Lowfer] Worthwhile going to Shielded loop?

Mon, 27 Oct 2003 21:21:30 -0600

My Ashlock loop picks up Dex with no preamp so I consider it good enough. I
also used it to listen to Ralph's CW and I can always see his signal.
Receiver used to listen to Ralph was a Kenwood TS 440 with no preamp nor
converter.

Mike>WE0H

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of John Andrews
Sent: Monday, October 27, 2003 1:35 PM
To: [email protected]
Subject: Re: [Lowfer] Worthwhile going to Shielded loop?

Paul,

My only experience with shielded receiving loops has been with small,
multi-turn versions. There were no significant reductions in noise, and the
extra capacitance did narrow the tuning range.

But I haven't played with a larger, single-turn shielded loop. I'd defer to
Jay's experience on that one. He and I have produced similar signal reports
with our respective antennas. Mine is unshielded, with 14 turns on a 6 foot
square. The turns are an inch apart. I'd suspect that Jay's antenna delivers
more signal (+noise) to the preamp, though. I tried my "Ashlock" loop for
receiving on 137 kHz last winter, and found that despite the greater signal
(+ noise), I wasn't copying anything better than I could with the smaller
loop. It did offer the possibility of eliminating the preamp, though.

John A.

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