5
TRANSMITTER UNIT
EQUIPMENT DESCRIPTION
The instrument consists of two units. The TRANSMITTER,
which is the small black box, produces a high frequency signal which
is reproduced in the pipe by one of two methods. When it is placed
in the area of the pipe with its longest dimension parallel to the pipe,
it will inductively create a similar signal in the pipe. It may also be
directly connected to the pipe at a water faucet, gas meter, water
meter or other above ground connection by using the two binding
posts on top of the TRANSMITTER. One post should be connected
to the structure and the other to a metal rod which is pushed into the
ground nearby to a depth of six or more inches. Do not place the
TRANSMITTER directly on metal covers.
The latter method has certain advantages in that it produces
a stronger signal in the pipe and thus allows the RECEIVER to be
used at a greater distance from the TRANSMITTER. It also helps to
avoid picking up other nearby structures by confining most of the
signal to the structure being sought.
The inductive method, however, produces excellent results
in most cases and is certainly faster and simpler than the direct con-
nection method.
The RECEIVER unit contains the receiving apparatus to pick
up the signal, a sound generator and a device to produce an
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