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LF: RE: investigating loop antennas

To: [email protected]
Subject: LF: RE: investigating loop antennas
From: "Ashlock,William" <[email protected]>
Date: Tue, 12 Mar 2002 13:02:38 -0500
Reply-to: [email protected]
Sender: <[email protected]>
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:[email protected]]
Sent: Tuesday, March 12, 2002 5:02 AM
To: [email protected]
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 ([email protected]).

73 and many thanks in advance,

Rik  ON7YD



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