Specifications

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5.0 Adjustable Directive Loop Antenna
A small, highly directive, four-turn loop antenna can be constructed
for indoor or outdoor use. The Adjustable Directive Loop Antenna
can be used in a room as small as 10 by 10 feet. It can be hung from
the ceiling with the supplied rope for orientation of the antenna for
the best receiving or transmitting signal. By listening to a station, the
operator can simply rotate the antenna for best signal strength or intel-
ligibility.
When used indoors, appliances may cause local interferences or radio
frequency pollution which could substantially impair the incoming
signal. In this situation, the antenna can be oriented to minimize the
interference and enhance the incoming signal. Also, when reaching
the contact station, a test can be performed by asking the contact sta-
tion for a signal report. Rotating the antenna in 45 degree increments
is the best way to determine the best radiation direction.
Direction of the angle is perpendicular to the plane of the antenna
with directivity gain varying from 6 to 12db for a 4-turn loop antenna.
This depends on the operating frequency - the lower the frequency the
higher the directivity.
For this construction, two wooden flagpoles, sticks or plastic plumb-
ing tubes of 6 feet long would be required and a hookup point on the
ceiling, 7 feet or more above the ground.
The following pages describe this type of installation.
SEARCH KIT Manual
page 21
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