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Old September 8th 06, 08:58 PM posted to rec.radio.shortwave
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First recorded activity by RadioBanter: Jul 2006
Posts: 4,494
Default Antenna blues, so far my Sony AN-1 Wins !

In article . com,
"Jeroen" wrote:

Who is Kr1sts? How did you build it?


http://www.kr1st.com/swlloop.htm

Mostly according to this article. It was really easy to build.
Hardest was to find a proper capacitor wich I eventually found in my
girlfriends alarmclock (lol).

I'm going to skip the amplifier, after some research I learned that
it'll only amplify the whole sound, and adda bit of noise to it as
well, so it won't do me much good.

Instead I'm going to build another loop, geared towards the 60 meter
in specific. It will be a multiple turn loop made of a 1/10
wavelenght copper tube. More information can be found he
http://home.datacomm.ch/hb9abx/loop80m-e.htm

I'll start by using the capacitor they advise there, a 10-125pF so
3.9 to 10 MHz will be covered, including my fav. the 60 meters and an
amateurband I regurarly listen to.

I'm really enthousiastic in magn.loops after this first experiment,
and might have a AN-1 for sale in a not too long time from now. I
heard (on this newsgroup) one fetched 200$ a week or so ago on
eBay?!? That'll be great and allows me to build 4 more magnetic
loops!


The first link is a manually tuned loop and the second is a motorized
version of the same. A tuned loop will be quieter than a broadband loop
design I posted earlier.

The drawback with the tuned loop is you have to tune it along with the
radio complicating the operation of tuning in a station.

Looking at the first link I think the design would work better if there
was more separation between the pickup loop and the tuned loop. I would
attach the pickup loop on the other side of the PVC pipe.

The second suggestion is to use a series 50 ohm resistor from the coax
center conductor to the pickup loop. This may not do much other than
sharpen the peak of the tuning response.

--
Telamon
Ventura, California
 
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