Galaxy DX 2547 Посібник користувача - Сторінка 3
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CHAPTER 2 INSTALLATION
LOCATION
Choose a location close to an AC power outlet and convenient for running
the antenna lead-in cable. This transceiver is attached with the AC power
cord set. Proceed as follows to complete all necessary connections to the
transceiver.
1. Your transceiver has a standard antenna connector type, SO-239 located
on the rear panel for easy connection to the standard PL-259 coax plugs.
If the coax antenna cable must be made longer, use only enough coax
cable to suit your needs with impedance of 50 ohms, frequency range
from 26.965 to 27.405 MHz. This will insure proper impedance match
and maximum power transfer from the transmitter to the antenna.
2. Use 120V AC power for the base station.
NOISE INTERFERENCE
There are several kinds of noise interference you may encounter in base
station operation. Some of these noises come from fluorescent light,
electrical appliance, lawnmower, nearby commercial broadcast etc.
Commercial products are available to reduce interference from these sources.
Consult your dealer or professional amateur radio supplier.
Even though the transceiver has ANL and NB controls, in some installation
ignition interference may be high enough to make good communications
impossible. The electrical noise may come from several sources. Many
possibilities exist as variations between vehicles require different solutions to
reduce the noise.
ANTENNA
For best transmission and reception, your transceiver should use an antenna
especially designed for a frequency of 27 MHz. Antenna is to be purchased
separately and it comes with the installation instructions. Numerous types of
antennas are available. Some emphasize on ease of installation while others
emphasize on performance. Often the difference in performance for these
antennas is modest.
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1. Vertical Ground Plane Antenna : Omni directional antennas provide
optimum performance for contacting other fixed stations using vertical
type antennas in addition to all mobile stations. For medium long range
communications work.
Ground Plane
2. Directional Beam Antenna : Highly efficient and directional antenna
generally intended for fixed-to-fixed long range communications.
Directional Beam Antenna
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