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HUD CRT Assembly

Technical Information

Catalogue No: C0422
Category: Head-Up Display [HUD]
Object Type: Module/Sub-Assembly/Component
Object Name: HUD CRT Assembly
Part No: G0819-S6
Serial No: 120116
Manufacturer: Brimar
Division: Unknown
Platform(s): Gulfstream IV 
Year of Manufacture: 1997
Dimensions:
Width (mm):
94 
Height (mm):
83 
Depth (mm):
183 
Weight (g):
940 
Location: Main Object Store
Inscription(s):

Brimar Limited
Viewed as the finest in the World
Type No. G0819-S6
Serial No. 120116
Part No, 9002-00044
NSN ----------
Date Code 9747L
NSCM U3008
Made in England

Notes:

A Matching Card with deflection current feedback resistors would normally be fitted to the flat area. This CRT Assembly has 960mm cable (with connector) for its drive signals.
The reference document lists this as fitted to the ‘Executive HUD’ which is probably the Gulfstream IV. A CRT with the same part number is fitted to the overhead unit of the Gulfstream HUD (C1131) with a prototype Type No, X9116.

The more recent Cathode Ray Tube (CRT) for the Company Pilot’s Display Units are supplied as a CRT Assembly incorporating the CRT within its mu-metal housing. The CRT has a deflection coil within the casing which magnetically deflects the beam; focussing is electrostatic. The final anode operates at a high voltage of 18kV or more and the focus voltage is in the range 3-5kV.
A range of fine grain phosphors are used on the screen and the inside face, on which the phosphor is deposited, is accurately aligned to the mounting flange of the tube to ensure it coincides with the optical module's image plane.
When the CRT Assembly is fitted with its Matching Card it forms a Tube Unit Assembly (TUA).
The latest raster/cursive CRTs have a blank or silvered area usually at the bottom of the screen where the beam is deflected for a calibration test. This is found on F-16 C/D (which introduced the idea), LANTIRN and Typhoon.

4500 Series GEC Ferranti HUD: This TUA operates in a raster or cursive mode and uses a P43 phosphor.
C-17 HUD: The circular faceplate of this CRT is blanked top and bottom to match the shallow prism optics in the relay. A P43 phosphor is used and the HUD was planned to have growth to a raster display but this was not installed. This part number in the reference database is wrongly attributed to EFA.
F-5 HUD: This is a conventional TUA and is cursive mode only with a P1 phosphor
F16A/B HUD: It was during this programme that the TUA became a subcontract item. The cursive only TUA uses a P1 phosphor
F-16C/D HUD: A large circular screen with a test area and using a P1 phosphor The TUA operates in raster/cursive and combined modes. 
Gulfstream HUD: A truncated CRT operating in cursive modes with a P43 phosphor
LANTIRN HUD: A truncated CRT operating in raster/cursive and combined modes with a P43 phosphor
Typhoon HUD: A truncated CRT operating in raster/cursive and combined modes with a high drive P53 phosphor

In 1994 Honeywell teamed with GEC Avionics on HUD and the system was marketed as the HUD 2020, because of the link to good vision; it comprised a compact CB-200 monochrome combiner and EO-200 electro-optical overhead unit, together with the HG-200 digital headup guidance computer which was made by Honeywell. The HUD 2020 weighs only 23 kg with much of the saving coming from the extremely lightweight Combiner which is only 4mm thick. The Combiner is curved and extremely thin with a frequency selective coating made up of several hundred layers of variable refractive index material called a ‘rugate’ coating.

The 2020 system was certified to Category II and is offered as a standard option on the GIV, GIV-SP and GV

The original Gulfstream IV HUD was stroke only with "growth to raster" built in, but never taken to full production.

Honeywell developed an Infra-Red system with Kollsman which gave night vision through the HUD. The later HUD was a full raster/cursive capable unit and this system was an option on the Gulfstream. It was called EVS Enhanced Visual System.

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