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From: "Ashlock,William" <William.Ashlock@edwards.boc.com>
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE: investigating loop antennas
Date: Tue, 12 Mar 2002 13:02:38 -0500
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Rik,

I really appreciate your efforts on the TX loop antenna section. I'll send
you a bunch of info from this end. 

My bet is that these antennas will reach a popularity almost equal to the
vertical as soon as the technical fine-points and environmental factors are
understood. At the present time the only three 1w Lowfer beacons operating
in this area of the US are all TX loops with a fourth about to be assembled.

 
Bill A

-----Original Message-----
From: Rik Strobbe [mailto:rik.strobbe@fys.kuleuven.ac.be]
Sent: Tuesday, March 12, 2002 5:02 AM
To: rsgb_lf_group@blacksheep.org
Subject: LF: investigating loop antennas


Hello all,

the recent discussions on loop antennas inspired me (at last) to start with
the loop antenna section of my "antennas for 136kHz" webpage
(http://www.qsl.net/on7yd/136ant.htm)

I already have some basic information about loop (as transmitting antenna)
but I'm still looking for more info.
In particular I am looking for :

1. practical results with loops as transmitting antenna
- measured loss resistance (eventual loop-current vs RF power) related to
the loop dimensions and used wire
- other details on loops that were 'real world' tested (dimensions,
eventual drawing etc...)
- matching loop antennas
- tips for contructing loop antennas (do's and dont's)

2. efficiency of loop antennas
- how to calculate the radiation resistance
- overview of expected losses : copper-loss, ground-loss (edison effect ?),
proximity effect etc...

Of course any other information about transmitting loops is most welcome. I
assume that short info can be sent via the reflector, longer mails and
mails including attachments should be sent direct to me (on7yd@qsl.net).

73 and many thanks in advance,

Rik  ON7YD


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