KW 903-M – M-Type Retransmission Unit
M-Type transmission is found on many military and ex-military craft, so the application for the RTU is when the old gyro fails and a modern gyro has to be fitted. New gyros do not output M-Type stepper so the KW903-M allows the existing repeaters to be retained.
M-Type systems operate from their own battery supply, which has its own charger. The M-Type RTU retains the same arrangement.
For your information, M-Type transmission system has only 3 essential wires compared to 4 or 5 for S-type stepper or synchro systems.
There are 6 states per degree. The basic 24 volt supply may be required for illumination in the repeaters.
The KW903-M has a single rugged PCB as shown in the picture. It has an application as a transmitting magnetic compass for it will connect to an electronic compass system as well as a gyro..
Heading NMEA 0183 magnetic or gyro
M-Type transmission 3 wire.
Maximum current 8 Amps. (Repeaters take typically 0.6 amps each.)
Nominal voltage 24 volts. 24 volt output for illumination.
Rotation rate maximum 20 degrees per second.
can not lose step.
Change over low current DIL relay.
DC 24v nominal. (20 to 30 volts) from external battery or AC-DC supply.
Fused with resettable electronic fuses.
400 x 300 x 150 “duck egg blue/green” Eldon electrical enclosure with door Connection pluggable screw terminals.