VisionMaster Ship’s Manual Chapter 1
Technical Specification Additional Features
65900011 1–11
4.5.3.2 Azimuth Data Output
4096 Pulse Bearing Output
This incremental output is available either in RS422 format (to drive a
differential line), or as an open drain output (to drive a single-ended input).
Synchro or Resolver Bearing Data Output
The Scanner Unit can be fitted with a size 11 Synchro or Resolver. This is
not aligned: any alignment must be given externally.
The synchro may be a Control Transmitter (CX) or a Control Differential
Transmitter (CDX).
4.5.3.3 External Trigger Input
This 75ohm coaxial input lets the Transmitter synchronise with other
equipment on the ship.
When there is a signal at the external trigger input, external trigger will be
automatically chosen as the mode of operation.
Transmission occurs approximately 11μs after the leading edge of the
pulse.
4.5.3.4 Radar Silence Input
On receipt of this input, the transmitter is switched to standby within one
pulse-repetition interval. The transmitter remains on standby as long as the
signal occurs.
The input signal format can be selected to be: RS422, RS423 or
uncommitted contact.
The sense of the signal can be selected to be active high or active low.
4.5.3.5 Pre-trigger Output
This 75ohm coaxial output lets other equipment on the ship synchronise with
the Transmitter.
The leading edge of the positive output pulse occurs approximately 11μs
before the magnetron output.
4.5.3.6 Speed Select Input (X-band systems only)
This isolated closing-contact input lets you remotely select between high
and low antenna rotation speed.
This option cannot be used with the Antenna Rotation in Standby option, see
Section 4.5.2 ‘Antenna Rotation in Standby’.
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