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Monochrome Head-Down Display

Technical Information

Catalogue No: C0069
Category: Head-Down Display [HDD]
Object Type: Display Unit
Object Name: Monochrome Head-Down Display
Part No: 62 D 6202
Serial No: 006
Manufacturer: Marconi Avionics
Division: Unknown
Platform(s): Aérospatiale SA 330 Puma
Year of Manufacture: circa 1978
Dimensions: Width (mm): 200
Height (mm): 210
Depth (mm): 400
Weight (g): 13,080
Location: Rack RAA08 [Main Store]

Marconi Avionics Limited
H.C.D.U. Mk7
Part 62 D 6202
Ser. No 006
Asset No. 175009


HCDU = High Contrast Display Unit

Six general purpose HCDUs were manufactured by the Company Research Laboratory (FARL). These HDDs were based on a design also made for the Airborne Radar Systems Division at Borehamwood. They were intended to support trials programmes as and when the opportunity arose and especially to be compatible with high resolution EO Sensors.

The HDD use a Cathode Ray Tube with a monochrome green phosphor and offer high contrast symbology visible in 10,000ft-Lamberts ambient light. They will accept 625-line video, although two units were modified for 875-line. The twenty function keyboard has ten keys adjacent to the screen so that they can be labelled by on-screen legends. The keyboard interface was a serial data bus to a Panavia specification.

Two of the units were used by ADD for sales demonstrations notably at the Paris Air Show and one was incorporated into a cockpit simulator to study Direct Voice Input. The 875-line units were evaluated by RAE in Puma and Westland Helicopters.

This unit (S/N 006) appears in the Company literature around 1978 and was found in the old Thorn Building.

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