Vislink HDR-5000, Руководство пользователя и техническое руководство

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10 HDR-5000 User and Technical Manual
Antennas must be precisely upright (vertical) for best performance. The relative height of the antennas
should be the same (but is not critical). For example, if the antennas are mounted on a tower or a mast,
the antennas must be mounted vertically and parallel to each other and mounted at a similar height on the
tower or mast.
Measure the separation distance between the antennas from the center lines of the antennas as shown in
the following figure. The separation distance between the antennas will require fine tuning for optimum
performance. Start at the minimum recommended distance the antennas, then adjust in quarter
wavelength increments.
When you attach the antennas directly to the BDC RF INPUT connectors, then you must mount the
antennas in the same physical plane; that is, one antenna should not be tilted with respect to the other
antenna.
Figure 2-3. Attaching the Antenna to the BDC RF INPUT Connectors
You can install a pair of antennas that are each directly connected to a BDC on a vertical pole assembly
by doing the following:
1. Fasten the first BDC onto the mounting pole and secure it firmly in position using the mounting
bracket and heavy duty band clamp.
2. Connect the first antenna securely to the BDC RF INPUT connector.
3. Determine the minimum separation distance between the two antennas as specified in the
previous table.
4. Loosely fasten the second BDC to the mounting pole using the heavy duty band clamp at the
approximate separation distance.
5. Connect the second antenna securely to the second BDC’s RF INPUT connector.
6. Adjust the second antenna so it is parallel to the other antenna and separated by the minimum
recommended distance.
7. Securely fasten the second BDC to the mounting pole.
8. Connect each BDC to the receiver using high-quality UHF cables.
9. Repeat these steps for the next pair of antennas.
NOTE:
Signal quality will degrade if the antennas are installed closer than the
recommended minimum separation distance.