Resistive Losses around the loop are the biggest factor limiting
efficiency.
My friend, Paul Casper, K4HKX has done very extensive investigation and
documentation of Mag Loop performance. His loops exhibit excellence in
both Art and Science. I'd recommend taking in his findings posted on
his QRZ page.
https://www.qrz.com/db/k4hkx
You might get distracted looking at his other antenna creations. I
wrote the code running in the custom antenna control head.
The Mag Loops start way down at Section 7. The progression of loop
designs is staggering. You might find his HF mobile loop quite
interesting too. He uses a KX3 + KXPA100 with his mobile loop.
Warren Merkel, KD4Z
On 1/19/2021 12:17 AM, [email protected] wrote:
Date: Mon, 18 Jan 2021 20:17:38 -0700
From: David Gilbert<[email protected]>
To:[email protected]
Subject: Re: [Elecraft] Efficiency of MFJ remotely-tuned loop antennas
Message-ID:<[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
You are neglecting the losses in various connections in the system ...
including possibly the construction of the capacitor itself.? I don't
believe that they are insignificant.? There is a reason why top quality
variable capacitors often use welded plates.
I would also guess that contact resistance is worse for dissimilar
materials, such as a copper wire to an aluminum tube.
Yours is a limited theoretical analysis ... not a practical one.
Dave?? AB7E
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