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Doc No. DCP0000518 JH 12/7/99 rev2
Loop patterns
A loop pattern laid on the floor is a low cost
method to reduce over-spill by providing more
even field strength compared to the usual single
turn of cable laid around the room’s perimeter.
The basic pattern looks like the diagram below:
Large areas and multiple rooms
Use several loop patterns, each pattern
must be connected to a separate loop amplifier.
When laying out patterns, ensure each is 90
degrees out of phase with its neighbours as per
the following diagrams which show a two story
building:
Note. For a two storey building the same loop
position on different floors is also 90 degrees out
of phase.
Non-rectangular rooms
Layout as per a basic pattern and step back the
prongs to the shape of the room.
Each pattern should be considered as a
many pronged fork. The pattern should be
spaced approx. 2m from nearest wall / next
pattern, prongs of the fork should be spaced
approx. 2m apart and should be approx. 2m
wide, prongs should extend to approx. 3/4m of
base of fork.
Assume the cable is being run around the
edge of a room for cable diameter calculations,
as the pattern restricts the amount of power
which can be fed into the loop. The large black
arrow shows clockwise direction of loop. Break
into pattern at any point to connect PDA unit.
Loop patterns
