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Installation Instructions for: TV Antenna System.
Mount the PR-422CA/PR-420CA antenna high on the ship’s superstructure, clear of nearby objects. It
is best if the antenna is the highest object on the ship to insure maximum possible range and Omni-
directional performance. Do not mount the antenna in the beam of radar.
Mount the antenna on a 2-inch pipe that is braced against resonant vibrations. The antenna has a
short coaxial lead ending in an F connector. Make a barrel connector splice to RG-11 coaxial
cable; seal the splice and connectors against moisture and water entry, using “coax-seal” or similar
waterproof putty. The usual precautions should be taken in installing the coaxial cable run. Clamp it
against downloading force, so that the connection will not pull apart from the weight of the cable. Take
care not to crush the cable, and avoid bends over sharp edges. The coaxial run to the head end
amplifier should be less than 75 feet for best results. Any coaxial cable exposed to sunlight should be
painted with non-metallic paint to prevent possible UV damage over the long term.
Bolt the head end amplifier to the bulkhead in a position convenient for service, preferably at a height
corresponding to eye level for a standing person. Be sure to allow room to open the cabinet door.
Connect the Cabinet Ground to Ship’s Ground.
A direct AC supply to the PRA-420 (Power Supply and Line Amplifier for FM-TV) or PRA-422 (Power
Supply and Line Amplifier for AM-FM-TV) should have a circuit breaker or switch, or alternatively
should be supplied at an AC outlet in the same room. The room should be dry, with ventilation for heat
to escape. A TV set should be in sight of the head end amplifier so as to help when performing
adjustments to the system. It is often convenient to use a small portable TV set for this purpose. A
20dB test point is provided on the PR-4900 (Output Filter) to connect the monitor TV. Do not use any
of the 4 (-8dB) ports as the levels there are too high for the monitor and will cause overloading.
