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Naval PR-422CA
is an Active Extra High Performance Omni-directional wide-band active Terrestrial
AM-FM-TV Antenna
(0.1-30 and 40-860 MHz)
) for Maritime purposes where second-rate efficiency
is unacceptable. It covers AM-SW and FM Radio bands as well as TV bands.
Naval PR-420CA
is an Active Extra High Performance Omni-directional wide-band active Terrestrial
FM-TV Antenna
(40-860 MHz) for Maritime purposes where second-rate efficiency is unacceptable.
Constructed for High End Commercial and Military use, this compact and robust antenna shell is
made of thick UV protected ABS plastic filled with polyurethane foam which provides both structural
support and environmental protection. The mounting base is cast from Almag Marine Alloy. Almag 35
is a high purity alloy of aluminum and magnesium. Mounting hardware is made of stainless acid-proof
steel. All Almag/stainless interfaces are protected with TefGel to prevent electrolysis and galling. The
Shielded 3-band Low Noise Amplifier is protected from static charges and is removable for field repair
or replacement. Projected life at sea >15 years.
This internal amplifiers receive (+15VDC) operating power from the Naval head-end via coax cable. It
is removable, through the mounting flange, for repair or upgrade. This is a factory repair item and
should not be serviced by the untrained.
This antenna is based on a construction of 3 circular dipoles coupled to a low noise amplifier via a
broadband filter network. Maximum performance is assured through the extensive use of a Network
Analyzer in the initial design and in the final construction and tuning of each unit.
Microwave transistors provide needed gain with a minimum of internally generated noise. Careful
engineering and the use of very high quality components yield excellent inter-mod performance and
sharp hand tuned filters greatly reduce the chance of interference from outside of the TV bands.
The PR-422CA/PR-4420CA is at the head of the 4000 Series Marine Cassette Banded Amplifier
System with distribution passives introduced in 1998. The Series 4000 is the result of painstaking
engineering and the use of state of the art components such as high performance GaAs
Hetrerojunction Bipolar Transistors.
