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Power Settings
There are 3 power settings that the user can choose
from:
•
Low power (approximately .5 watt)
•
Medium power (approximately 1.5 watts)
•
High power (approximately 5 watts)
Low power will provide the least current with the
longest battery life. Actual power output will vary with
circuit resistance and frequency used. These values
assume a nominal 320-ohm load.
If the transmitter is producing low or no current due
to poor circuit conditions, the signal may be too
low to be detected by the receiver locator and
inadequate for tracing.
5. Check the Receiver.
Confirm that the transmitter and receiver are set to
the same frequency. Hold the receiver near the
transmitter cables and confirm a signal is being
received.
FCC Limits
47 CFR 15.213 requires that from 9kHz up to (but not
including) 45kHz, peak output power shall not exceed
10W. From 45kHz to 490kHz, it must not exceed 1W.
When the ST-305 is set to 262 kHz
version: 93 khz), the power output levels are limited:
Low:
Medium:
High:
These values assume a nominal load of 320 ohms.
Useful Operating Tips
•
The lower the resistance, the more current will
be put on the line. A good circuit is one that
allows enough current to flow so that the locator
gets a solid, clear signal.
•
To help lower the resistance of the circuit,
scrape away dirt, paint, and corrosion before
connecting to the target conductor or to the
grounding spike.
1.800.561.8187
NaviTrack Brick Line Transmitter
CAUTION
0.3 watt
0.6 watt
1 watt
www.
•
A good ground has lower resistance, which
allows more current and a stronger signal. For a
better
grounding spike as far as possible. Moist
ground is a better conductor than dry soil, so try
wetting the area if necessary.
•
The transmitter's leads can act as antennas,
broadcasting a strong signal. If locating close to
the transmitter, keep the leads short by stowing
the excess length on the transmitter's body.
This will reduce the amount of interfering
signals from the leads. Where possible, place
the transmitter away from the area of the
intended locate. This is especially true in
Inductive Mode, to avoid coupling through the
air with the receiver.
•
Start by using the lowest frequency and the
least amount of current needed to effectively
illuminate the line. Lower frequencies travel
farther because they do not dissipate as
quickly. Higher frequencies generally make it
easier to illuminate a line, but they don't travel
as far. They are much more likely to couple
onto other utility lines, distorting the signal and
reducing the accuracy.
Inductive Clamp Method
(European
Figure 8: NaviTrack Brick with Inductive Clamp
When using an inductive clamp, plug the inductive
clamp jack into the receptacle provided at the end of
the transmitter. The induction-mode LED will flash
when a clamp is connected. Note that for a clear
signal using an inductive clamp, both ends of the
utility should be grounded.
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connection
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ground,
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the
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