Pete & all: I have done a number of experiments with multi-turn K9AY Loops and flags. I have only made brief mentions in print, mainly in last year's NCJ article. Still sorting out the most useful data from a number of observations.
In short, what W8JI says is true -- larger conductors increase the signal level, and parallel multiple loops do the same. The mechanism is more complicated than simply reducing losses, involving the interactions with the fields. I'm still working on that analysis. One piece of data is that increasing the spacing between multiple, parallel loops also increases signal level (gain). This is on a scale of inches to a couple feet, so it's not array gain. 73, Gary K9AY Message: 9 Date: Sat, 2 Jan 2016 10:45:43 -0500 From: Pete Smith N4ZR <n...@contesting.com> To: topband reflector <Topband@contesting.com> Subject: Topband: Using shielded CAT5 data cable as feedline for active antenna; benefits of multi-turn K9AY loop/SAL/etc? Message-ID: <5687f0a7.6030...@contesting.com> Content-Type: text/plain; charset=utf-8; format=flowed I was recently reading a web page by LZ1AQ <http://www.lz1aq.signacor.com/>. It is full of fascinating data and design equations for the use of small magnetic loop antennas. There were two points, in particular, that caught my layman's attention: 1. He recommends using shielded CAT5 data cable with RJ-45 connectors as feedline. The obvious advantage is having three pairs left over for voltage supply and control. See <http://active-antenna.eu/amplifier-kit/> for more information. 2. He cites experimental data showing that coplanar crossed loops and multi-turn quad loops both offer very significant improvement in the recovered signalcompared with a single loop. See <http://www.lz1aq.signacor.com/docs/experimental-comparison-v10.pdf> to check whether I got this right. Anyway, it occurred to me to ask if anyone has ever tried multiturn K9AY, SAL or flag/pennant receiving antennas, and did you see something similar? Any other critiques of his design would be appreciated. The price is certainly right, and the construction looks good. A couple of 1-meter coplanar loops wouldn't be at all hard to construct. -- 73, Pete N4ZR _________________ Topband Reflector Archives - http://www.contesting.com/_topband