Broadcast mode uses an inductive antenna located in the transmitter case to broadcast
a signal around the case in an approximately 25 foot radius in all directions. It allows the
user to transmit or induce signal from the transmitter directly into the ground. Any
grounded metallic cable (without solenoid) traveling through this electromagnetic field
will pick up at least some of the tracing signal, making that conductor traceable with the
wand.
There is nothing a user needs to do with any controls to use Broadcast Mode other than
the selection of Broadcast mode on the transmitter and receiver. To do this, place both
the transmitter and receiver in the Broadcast Mode by selecting “Broadcast” on
the selector switch. Place the Pro800 transmitter on the ground over the cable you
wish to trace and turn it on. Do not tightly shut the transmitter case as it will turn the
transmitter off. The transmitter is now inducing signal approximately 20 feet from it, and
energizing any conductors in that field. You may now trace any conductor that has
picked up that signal.
The Broadcast Mode automatically tracks in Null Mode. However, due to weaker signal
inherent in inducing signal, it may sometimes appear as a peak signal.
Also note, when the user is within 20 feet of the transmitter, you cannot trace a cable
because the signal from the case itself will overpower the induced cable signal. The
user will always hear the transmitter signal within 20 feet of the transmitter case.
The Broadcast mode does not have a power output adjustment on the transmitter. To
indicate this, the analog needle on the transmitter normally should read 10 or more. In
addition, remember that ALL conductors in the ground that can pick up the signal will.
Therefore, tracking is better in non-congested areas.
It is important to understand the uses and limitations of Broadcast Mode when compared
to direct connection with the alligator clips.
How to determine depth - Find the null over the wire path and mark it. Then place
the tip of the receiver on the ground at the mark. Without lifting the receiver tip from the
ground, lower the top of the receiver to approximately a 45 degree angle and slowly walk
the receiver away from the wire path until you reacquire the null. The distance between
the wire path and the newly established null is the approximate depth of the target.
Determining target accuracy - This is a very easy to perform method of determining
target accuracy. Place the tip of the receiver on the ground directly over your suspected
target location, switch from null to peak by pressing the mode selection pad. The peak
and null responses will agree if the locate is accurate. If the peak and null are off by
more than a few inches the location is not accurate. Toggling between the null and peak
modes often when locating the wire path will assure you of accuracy and help build your
confidence.
Helpful Hints – Increases in signal strength and/or the size of the area it is occurring
from usually indicates some type of anomaly in the cabling. Things that could cause this
are valves (as described above), nicks, cuts, bad splices, or cut wires. Cable in good
condition does not normally change the tone or strength, other than a very gradual loss
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