Marti Electronics SRPT-30, Руководство пользователя

Страница: 23 / 129

8/7/2003
17
System Grounding
It is essential that the RPU antenna system be properly grounded for safety and proper operation.
Antenna Installation and Adjustment
The polarization of the transmit and receive antennas of the RPU system must be the same! This means that if the
transmitting antenna is vertical, the receiving antenna must also be vertical. Each antenna should be attached to the
tower using the proper side mount or top mount hardware. If an RF wattmeter is available, each antenna and
transmission line can be checked for VSWR when the transmitter is supplying power to it. The VSWR should be less
than 1.5 to 1 (1.5:1).
If the antenna system fails to give the predicted signal strength level, the following
items should be checked:
1. Check for correct assembly of antenna.
2. Check that antennas have same polarity.
3. Check VSWR of both transmit and receive antennas. VSWR should be less that 1.5:1.
4. Check for obstructions in the path such as trees and man-made structures. The base antenna must be high enough to
provide a line-of-sight path to the remote transmitting antenna.
CAUTION & WARNING
YOU CAN BE KILLED IF AN ANTENNA COMES IN CONTACT WITH ELECTRIC POWER LINES
OR EXPOSED ELECTRICAL WIRING.
FOR YOUR SAFETY, USE EXTREME CAUTION WHEN IN-STALLING ANTENNAS.
KEEP AWAY FROM POWER LINES.