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LF: loops

To: "rsgb rsgb" <[email protected]>
Subject: LF: loops
From: "gii3kev" <gii3kev[email protected]>
Date: Sat, 09 Mar 2002 15:11:34 +0000
Organization: Netscape Online member
Reply-to: [email protected]
Sender: <[email protected]>
This particular loop is now hoisted into its final position between 2
high beech trees, a convenient place although I would like it to be
further away from the vertical/inv L system. Top horizontal totally in
the clear, bottom horiz 6 ft above ground, each vertical leg about 10
feet or more clear of tree trunks and branches.
Loop is symetrical and rectangular 124 ft horiz x 40 ft vert, area =
4960 sq ft.
Inductance measured = 173 uH
Resonant F measured = 3065 khz
Feed point bottom right corner.
Feed 75 ohm coax, about 100 ft long,  distance f rom right bottom corner
to shack rx.
-----------------
First qso heard on loop was G6RO and EI3CZ signals slightly down
compared to main vertical system but Q5, good considering the loop is
not resonant yet on 136 khz, looks promising, but it is a fair sized
loop, although small relative to 136 khz.
Both stations not too far away.
EI3CZ- 410 Km from me
G6RO- 115 Km
------------------
The next step is deciding what method to use to resonate and match the
loop to 50/75 ohms  All my equip is designed for 50/75 ohms. Series or
parallel, transformer or capicator networks that will handle the power.
I will have to do some research and calculations and experimentation, I
will optimise first on rx and tx low power.
I will let those interested know the results, quite a lot of interest
from the USA where others are experimenting along the same lines as
myself.
Its snowing at the present so just got the loop up in time !! Temp abt 9
c (warm snow)
73 de Mal/G3KEV


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