Vivax Metrotech vLoc3 Series User Guide

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Page 9
4.3 Enhancing the loopback method of cable identification
using the SIS signal
As described before, a more reliable method of loop backing the signal on the cable
is possible if the cable is out of service. This method can be further enhanced with the
aid of the SIS signal.
Method:
Set the transmitter to a SiS frequency such as SiS 491Hz perform a SiS reset as
described above.
Now set up the transmitter as in the illustration below, with the far end connected and
with the transmitter connected across a twisted pair of cable.
At the location of interest, hold the antenna on each of the cables in turn. Run the
antenna along the cable keeping the arrow on the antenna pointing forwards. On the
incorrect cable, the signal level will be small and steady. On the correct target cable,
the signal will rise and fall in sympathy with the cables twist. Also, if on the target
cable, at each peak, the polarity indicator will also change in sympathy from "+" to "-".
Further conrmation can be achieved by the following:
• Run the antenna along the cable with the ats in line with the cable, stopping at a
positive (+) peak signal.
• Rotate the antenna around the cable keeping the antenna at the same point
along the cable.
• If on the correct cable, when directly on the opposite side of the cable, the signal
will again peak, but the polarity indicator will show "-".
SIS

Vivax Metrotech vLoc3 Series Specifications

General

Brand	Vivax Metrotech
Model	vLoc3 Series
Category	Receiver
Language	English