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Synchro to Digital Rotary Encoder Servo Unit

Technical Information

Catalogue No: C0902
Category: Flight Control
Object Type: Module/Sub-Assembly/Component
Object Name: Synchro to Digital Rotary Encoder Servo Unit
Part No: 4702-00039
Serial No: 381
Manufacturer: Elliott Bros (London) Ltd
Division: Inertial Navigation [IND]
Platform(s): Lynx
Year of Manufacture: 1970
Dimensions: Width (mm): 170
Height (mm): 92
Depth (mm): 55
Weight (g): 518
Location: Grey Dexion Shelf Unit [Main Store]

Gearbox Assy Rotation Servo
Ref. No. 6JA/6370476
Ser. No. 381
DL 4702-00039
[Mod State] 2


An Encoder is a device that measure the rotary position of a shaft by converting mechanical motion into an electrical signal. Encoders are digital devices, so their integration into control systems is relatively simple and doesn’t require complex electronics or circuitry. From a performance standpoint, Encoders have a lower weight and rotational inertia than Resolvers, making them more suitable for applications with high acceleration and deceleration rates. Encoder accuracy is typically in the range of 20 arcseconds. The assembly unit incorporates a Moore Reed 18DU188 rotary encoder providing a digital output of synchro angle.This is probably part of the Mk34 AFCS used on the WG13 Lynx.

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