10
Cable location using the Loki transmitter
The Loki transmitter is used to actively apply a locate signal to cables or metallic pipes.
This signal can be traced using the Loki receiver in either Transmitter (T) or Dual mode (D).
Note: Use of the Loki transmitter is strongly recommended, as passive power signals
from pipes and cables may not be present, or detectable, on all cables and pipes.
Induction
The Loki transmitter has an internal aerial that will induce a signal onto a line (or
lines) directly below it. This is useful when you do not have direct access to the
line. Generally, induction is only effective to depths of 6’ 6” (2m).
Note that the induction mode is indiscriminate and will apply a signal to all pipes/
cables within its range. Induction is only available with frequencies 8 kHz and above.
Induction Procedure
1. Place the transmitter over the approximate position of the underground utility
with arrows pointing parallel to its path.
2. Set the Loki receiver and Loki transmitter to the same active frequency.
3. Set the Loki receiver’s sensitivity to 100%.
4. Start locating the line at least 33 feet (10m) away from the transmitter.
5. Mark the ground when the Loki receiver detects any signal spike.
Note: Induction cannot apply a signal to a line below reinforced concrete.
Note: The Loki receiver may detect the transmitter signal directly from the
transmitter rather than the target line, so do not attempt depth measurements
within 10 meters of the Loki transmitter.
To check if you are detecting a signal from the Loki Transmitter, point the Loki
receiver directly at the Loki transmitter. If the Loki receiver’s signal strength
increases, either reduce the Loki transmitter power or increase the distance
between the Loki receiver and Loki transmitter. If the signal strength decreases,
the signal is from the buried line.
