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Sonics Motherboard

Technical Information

Catalogue No: C0935
Category: Surveillance/Acoustics
Object Type: Module/Sub-Assembly/Component
Object Name: Sonics Motherboard
Part No: 6743-00387 DL Iss
Serial No: ?
Manufacturer: Canadian Marconi
Division: Unknown
Platform(s): Merlin AW101 (EH101) 
Year of Manufacture: Unknown
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Main Object Store

AW. No. 40-0259/B
AW. No. 40-0248/B
MRB 240/01957
Pt. No. 6743-00387 DL. Iss.
Serial No.
Mod. Record -
[on masking tape]
Interconnect P.C.Board
Multilayer AQS901
(could be from AI Radar)


This is a bare Sonics Motherboard without connectors or any other components fitted.

AQS-901 was given full development go-ahead in April 1975 as part of the British Nimrod Mk 2 programme. The scale of this contract merited the formation, in 1973, of a dedicated Maritime Aircraft Systems Division (MASD) which was prime contractor, with Computing Devices Company of Canada as major subcontractor.

AQS-901 can collect information from up to eight sources simultaneously and a wide variety of active and passive sonobuoy types. The AQS-901 main computer was a version of the Marconi-Elliott 920 ATC, with a nominal 64,000-word store which is expandable up to 256,000 words. Bulk memory units provide extra capacity. The system converts sonobuoy data for presentation on electronic displays or multi-channel paper recorders.

The system would also be fitted to the Royal Australian Air Force’s P-3C Orion maritime patrol aircraft. The AQS-901 system ultimately consisted of 20 units of electronic equipment which covered radio receivers, buoy signal processors, computer units, controls, CRT and Hard Copy displays. Both the Nimrod and Orion aircraft carried two complete sets of these plus another shared CRT display, control unit and a radio transmitter - 43 items in total. Each aircraft had an acoustics station seating two Sonics Operators and a Tactical Coordinator.

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