Naval Pr-420 Ship's Marine Fm Tv Antenna on 2040-parts.com

The PR-422 is designed for High End Commercial and Military vessels and  is based on a configuration of 3 circular dipoles (one is a special flexible printed circuit) coupled to 3 parallel amplifiers ( 7 transistors ) via a separate broadband filter network.

Maximum performance is assured through use of a newly designed set of elements and 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 temperature compensating components yields excellent inter-mod performance and sharp hand tuned filters greatly reduce the chance of interference from outside of the TV bands.

This compact and robust antenna incorporates a shell  made of thick UV-ABS plastic which is injected with polyurethane foam to protect the elements and EMI shielded internal amplifier. The mounting base is cast from Almag Marine Aluminum Alloy which is Shot Peened for extra strength.
Mounting hardware is made of stainless acid-proof steel.
The Shielded Low Noise Amplifier is protected from static charges. 

The PR-422 is at the head of a new 4000 Series Marine Cassette Amplifier System with ground isolated distribution passives introduced in 1998. The Series 4000 is the result of painstaking engineering and the use of state of the art components including high performance GaAs Hetrerojunction Bipolar Transistors and MMIC devices.

PR-420 is identical to PR-422 but without AM-SW radio reception

 
•      Frequency range: 0.1-860 Mhz
•      Average VHF gain: 25 dB (amp)
•      Average UHF gain:  tilt  16-20 dB (amp)
•      VHF Noise figure: 3.0 (amp)
•      UHF Noise figure: 2.5 (amp)
•      Active Components: 7 transistors
•      Max output level: 111 dBuV min (2 signals-60 dBIM)
•      Third order intermod products: >20dB IP3
•      Antenna factor: Ka = 0.12 AM
•      Filters: Band pass 100 Khz- 30 Mhz., 47-108 MHz.,
•      174-230 MHz.,470-860 MHz.
•      Broadband rejection filter:140-165 MHz.
•      Polarization: horizontal
•      Antenna pattern: omni-directional
•      Supply voltage to antenna: 15VDC nominal
•      Current consumption:  130 mA Nominal
•      Operating temperature: -40 to +55 C.
•      Protection circuits: static discharge device fires at 65 volts
•      Impedence: 75 ohm nominal
•      Connector "F" type Gold electroplate or BNC-75
•      Return loss:  >10dB with optional output connector.
•      Radome material: UV protected ABS
•      Flange material: Stainless, Shot peened Almag Marine Alloy
•      Internal stabilization material: Polyurathane foam injection
•      Element material: copper foil
•      Element type: three looped dipoles with Z match pcb
•      Shipping Weight: 9 pounds with 50 ft coax and aluminum flange
•      Dimensions:width 44.5cm (17.5 in), height 44.5 cm (17.5 in)
•      Shipping container dim: 18 inches wide x 18 inches high