[Elecraft] Magnetic Loop Antenna Question

[w7aqk]

Stan,

Well, my first question was "how about the capacitor?".  I looked at the 
article, and it says no capacitor needed, but that it is mono band only.  I 
would have to guess that it is "mono-frequency" as well, or just about!!!

Dave W7AQK



-----Original Message----- 
From: stan levandowski
Sent: Sunday, November 13, 2016 7:01 AM
To: w7aqk
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Magnetic Loop Antenna Question

My first loop was because of an article I read online that said, "Look
no further!  Here is all you need: 10 feet 3 inches of 3/4-inch hard
line, 2 hose clamps, a chassis connector, a little bit of house wire,
and you could be in business as shown in the photo below"


The darn thing worked incredibly well!  It was for 40 meters. Here's the
"starter article" at http://www.antennex.com/hws/ws0902/hardline.html


This inspired me to build a square loop made of two inch copper pipe
with a vacuum variable and a 1 rpm 12VDC motor which I switched by
reversing polarity.  It was for 20 meters and worked great with QRP.


I finally bought an Alexloop for true portable work.


73, Stan WB2LQF

On Sun, Nov 13, 2016 at 04:41 AM, w7aqk wrote:

> Terry,
>
> If you have the inclination at all, why not build one!  It's really not 
> all that hard to do.  Quite a few years ago I did that, and the thing 
> worked pretty well.  I got the info from a QST article from back in the 
> 90's.  The hardest part might be finding a proper capacitor for tuning, 
> but if your junk box has much in it, you may have that problem solved.  I 
> complicated things a bit by adding a small low voltage motor to turn the 
> capacitor.  You need to use one that has a very low rpm rate for that, but 
> they are available.  Not counting the motor, the whole thing cost lest 
> than $10 to build.  I used copper tubing, but you could use coax shield. 
> I recommend copper tubing.
>
> Even though band conditions are rather poor these days, you can still do 
> good things with a mag loop--especially on 20 meters.  You may not be able 
> to run that amp through it, unless you get a pretty husky capacitor, but 
> 15 watts is not usually a problem.  You just might be surprised at what 
> you can do with one of these things.  They are fun to play with.
>
> 73,
>
> Dave W7AQK
>
>
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