ZL,

I have made several Loop Antennas in the One Meter Square Size range.

IIRC: Two Loops one smaller and the other larger; that are
built with the same care and materials would have the same
'relative' Gain with respect to their Peak Signal and ability
to Null a Signal. (Both Loop Antennas would have about the
same "Q" Number.)

AUSTRALIAN ONE METER SQUARE Loop Antenna = 10,000 cm Sq.
A larger Loop Antenna has a greater Signal Capture Area and
usually this results in a higher Signal Outout.
* The Australian 1 Metre Loop from Hard-Core-DX.Com
- by Werner Funkenhauser
http://www.hard-core-dx.com/nordicdx...op/1mloop.html
* Bigger Image of the "Australian 1 Metre Loop"
http://www.hard-core-dx.com/nordicdx...op/rnloop1.gif
* The One Meter (3-4Ft) Loop Antennas all perform really good,
but they are big and need a lot of space to position them and
operate them.

SELECT-A-TENNA [Twelve Inch Round] Loop Antenna = 730 cm Sq.
A smaller Loop Antenna has a small Signal Capture Area and
usually this results in a small Signal Outout.
* Check-Out the "Select-A-Tenna" (SAT) Model 541-M
SAT= http://www.selectatenna.com/
* The smaller Loop Antennas like the Select-A-Tenna perform
very well, plus they are easier to use and simply more portable.

THE NUMBERS: Based upon the above two numbers for the
Australian One Meter Square Loop Antenna -=V=- the
Select-A-Tenna [Twelve Inch Round] Loop Antenna the relative
areas of the Loops are ruffly (10,000/730) 14 to 1. What this
means that the Australian One Meter Square Loop Antenna will
have a Higher Signal Level (Output) and because of it's
greater Signal Capture Area this would result in less apparent
fading of the signal when using it vice the Select-A-Tenna.

RANGE: Estimated usable DXing Ranges of these two Loop Antennas.
* Australian One Meter Square Loop Antenna = 2775 Km (1750 Miles)
* Select-A-Tenna [Twelve Inch Round] Loop Antenna = 750Km (475 Miles)

IMPROVING THE "Q" OF THE LOOPS:
* One thing that can 'improve' the "Q" of a Loop Antenna is to
Replace the wire used in the Loop with LITZ Wire.
* Another thing is to reduce the "Spacing" between the Loop Turns.
The Australian One Meter Square Loop Antenna plans call fo 12mm
(1/2") Spacing you mite try reducing this to 9mm (3/8").

LOOP ANTENNA HELP:
* "Loop Antenna Information Forum" eGroup on YAHOO !
LOOPS= http://groups.yahoo.com/group/loopantennas/
* "Ferrite Rod Antenna Experimenters" eGroup on YAHOO !
http://groups.yahoo.com/group/FerriteRodAntenna/
* "Shortwave SWL Antenna" eGroup on YAHOO !
SWL= http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
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iane ~ RHF
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Some Say: On A Clear Day You Can See Forever.
http://groups.yahoo.com/group/Shortw...na/message/502
I BELIEVE: On A Clear Night...
You Can Hear Forever and Beyond - The Beyond !
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= = = Zach Liang wrote in message
= = = . ..

RHF , have you tested this antenna over a australian loop?

MY asutralian loop ( ie a 1 x 1 sqm x 7 woulnds ) ofered possibly more
than 30 db gain [i have not any ability to measure the signal level !)
] over the standard radio loop no matter which is ( degen 1102 , Khibo
C300 , Bolong and other poket radios I use)
I could listen in mid day ( 3-5 LT) in Thessaloniki N Greece even a
french station on ca. 600 kHz with 500 kW

On 1 Mar 2004 13:35:31 -0800, (RHF) wrote:

"B
BA,

Check-Out the "Select-A-Tenna" (SAT) Model 541-M

SAT= http://www.selectatenna.com/

"This is the second generation of Select-A-Tenna. It has the
same intrinsic +30dB signal strength improvement and features
as the basic 541 model. In addition, a jack on the front panel
allows the unit to be connected to either an outside long wire
and ground, or as an alternative, directly connected to a
radio's antenna and ground terminals when the radio has no
internal ferrite rod antenna."

iane ~ RHF


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