|
Electronics
Navigation radar
For safe navigation, the Spica is equipped with a navigation radar PN 610, supplier’s designation TERMA SCANTER MIL Mk2.
The system is adapted for archipelago navigation at high speed; with its high-speed antenna and short-pulse capabilities the radar system can provide instant information at a good resolution.
Basic data:
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
short pulse 0.06 µs, long pulse
0.6 µs |
| |
|
|
|
|
|
|
|
PRF (pulse repetition frequency) |
|
|
|
Short pulse 4000 ±200 Hz, long pulse 2000
±100 Hz |
| |
|
|
|
|
|
|
|
|
|
7" horizontally polarized slit antenna (X-band) |
| |
|
|
|
|
|
|
|
|
|
Horizontally <1.2°, vertically
19±1° |
| |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
150 W thermostat-controlled |
| |
|
|
|
|
|
Command and Control
The original plotting device was a plotting table ADMIRALITY MARK XIII whose input was course information from the gyro system and range data from the logging system.
After a few years the plotting table was replaced by a more advanced Command and Control instrument, “Stridsledningsindikator 835” (SLI 835). This met the needs for plotting, presented an overview for evaluation of various targets (their position, speed, course), and provided target indication for fire commanders of artillery and torpedo operations.
The indicator is part of an integrated radar system with PN 610, ARTE 62, and TORPE 677 and including these main units:
SLI with 16" indicator, two MAI (target indicators) for ARTE 62 and. TORPE 677, and a distribution unit FDE for pictorial, sync, and antenna information.
Communications
The radio communication system comprises one USW-station (ultra-shortwave) type ADAM, three USW-stations type BERTIL, one SW-station (shortwave) type CESAR, one SW-transmitter type DAVID, plus central antennas with receivers for LUFOR information (air defence orientation), LV-order (anti-aircraft order), broadcast, and television.
The USW -station ADAM is for telephony, and type BERTIL is for tactical co-operation. The SW-station CESAR is a battery-powered reserve radio station. The SW-transmitter DAVID includes two receivers and has a built-in calibration feature enabling a highly accurate frequency setting.
Internal communication is provided by three telephone systems: Tmö (telephone system manoeuvre), Ta (telephone system artillery), and Tslo (telephone system command and control).
Initially the telephone systems were powerless, but they were later on replaced by a power-supplied system for better audibility.
The Tmö mainly serves for communication when the ship is leaving or approaching a port. The main use of the Ta is communication for those in the service branches artillery and torpedo. The Tslo is used in the SLC for follow-up of positional information and for command and control.
|
