Yeah, if I remember my experience, it was rather "mono frequency" for a
few kHz. Then I had to adjust the coupling for better SWR. It wasn't
all that user-friendly! However, it was a great and cheap way to play
with a mag loop. I remember sitting on my front porch with a K1 and
working DX with it. The loop was just tie-wrapped to a broomstick stuck
into a patio umbrella stand and sitting on my driveway. It was enough to
get me interested in reading and experimenting so it accomplished the
authors' objective.
73, Stan WB2LQF
On Sun, Nov 13, 2016 at 01:57 PM, w7aqk wrote:
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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