KW960 – NMEA to Synchro Interface
It receives data by NMEA 0183 signal and generates low power synchro, resolver, or sine-cosine output.
It is designed for the lower voltage synchros such as Anshutz, 50 v ref 24 v line to line. For higher voltages (115/90) external transformers may be fitted. (Shown unde the main board in the picture.) The phase output power is greater than 5VA.
Applications are to generate synchro gyro, wind direction synchro, pitch and roll synchros and speed synchro when retrofitting with an instrument without a synchro output, include reproducing synchro in specialist systems, and on retrofitting a modern gyro which does not
have a synchro transmission. It can even be used to generate wind instrument and rudder angle synchro signals.
The synchro output turns smoothly from one heading to another without jerks or jumps, and the turn rate is controlled by a rotary switch on the PCB.
– 360:1, 180:1 90:1, 36:1, 30:1, 9:1 or 1:1 ratio signals.
– Synchro or optionally “sine-cos” or resolver output.
COARSE & FINE transmissions are popular on naval craft for driving turret servo systems.
Two of the interfaces would be used supplying, for example, 1:1 and 36:1.
SOME GYRO SYSTEMS SUCH AS GYLOT have a coarse/fine arrangement in the steering stand. This interface will allow a modern gyro to be installed whilst retaining the existing Gylot autopilot and steering stand.
115/90v SYNCHROS: Step-up transformers may be fitted for 115/90v synchros. In practice the interface has enough power to drive them directly at reduced voltage without transformers, and our tests show that 115v/90v Microtechnica synchros follow perfectly.
Tests also show that 500 Hz Vega or Kurs gyro repeaters follow perfectly at low voltage 50 Hz.
FREQUENCY: As standard the interface outputs 50/60 Hz synchro. If operated from 400/500 Hz it will output 400/500 Hz synchro. It may also operate from 50/60 Hz, but produce 400/500 Hz phases, if supplied with low voltage 400/500 Hz reference source.
WIND SYNCHRO. An option jumper allows the interface to accept wind angle from NMEA input, and simulate a wind vane transmission.
200 KNOTS/REV SPEED is also available.
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