Inductive Coupler Description; Operation; Positioning Of Coupler; Inductive Antenna Description - Textron Tempo 501 Guia De Inicio Rapido

3. INDUCTIVE COUPLER DESCRIPTION

The Inductive Coupler is designed to induce a tracking tone into a subject cable
or wire without establishing metallic contact or removing bonds. (See Fig. 9).
The Inductive Coupler is constructed of plastic and iron and can accommodate
up to a 3" cable.
A. Operation
Clamp the Inductive Coupler around the insulation of the buried cable
to be tracked.The Coupler must be completely closed to transmit the
maximum signal. Connect both transmitter leads to the two terminals
on the face of the coupler. Turn transmitter on to approximately a #5
output setting and radius the immediate area with the tracker receiver to
determine path. The power output may be increased for greater distance.
B. Positioning of Coupler
1. Coupling Points: The bond is one aspect which enables the induc-
tive coupling method to work. For proper placement of the clamp at a
pedestal, place it between the bonding point and the point where the
cable goes into the ground. In CATV applications, these positioning
points would be at the end of the main line or at the subscriber's house.
Applying the coupler above the bond will effectively "block" the tone
from transmitting past the grounding point. (See Fig. 10) By strategical-
ly placing the clamp in the direction of the transmitter, tone may be con-
trolled.
2. Mid Run Coupling: If the subject cable is relatively long, current is per-
mitted to flow back through earth as tone is transmitted in both direc-
tions. (See Fig. 11)
3. Near End Coupling: To supply tone from the end of a cable, the end
of the cable must be bonded or grounded. (See Fig. 10)
4. Reduced Tone At Branch: When tone is applied to a cable which
has a branch, the tone will be split and be effectively decreased relative
to each conductor's length and size. (See Fig. 12)

4. INDUCTIVE ANTENNA DESCRIPTION

The Inductive Antenna (See Fig. 13) is used to apply a tracking tone into a
cable, wire or metallic pipe by radiating a signal from the ground surface. This
method is used when there is no accessible way to make a direct connection.
Fig.8 - Signal Over Dropwire Splice
The Inductive antenna or transmitter
loop is fitted inside the carrying case of
the 501 System and is powered by the
Model 50lTtransmitter.
Fig.9 - The Inductive Coupler
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