2-17
2.16 Check of ARP and RP board Connection
The system checks the connection of the ARP and RP board every power on. If the CPU on the
SPU board fails to communicate with the ARPA or RP board, the related display does not appear
on the screen, but also the ARP and/or RP line is not displayed on the self-test result display.
2.17 ARP-23 vs. ARP-26
The ARP-26 uses the latest hardware of the ARP-23 for FR-2100 series radars, 18P9002-2
having U44 of 18S9007. The boards level –1 and –2 having U44 of 18S9001 cannot be used for
ARP-26. The software has been changed to improve the performance.
The major functional differences are;
1) Operational with 42 rpm scanner unit (ARP-23: 36 rpm)
2) “Scenario” in compliance with HSC performance standards (no scenario)
3) A maximum of 3 reference targets (one target)
4) Variable width of automatic acquisition area from 0.5 to 1.0 nm (0.5 nm fixed )
5) Guard zone alarm for both inward and outward violations (inward only)
6) Vector display time selectable either after 1 min. or within 20 scans (after 1 min.)
7) VBW and VHW speed data in IEC-61162-1 acceptable (not acceptable)
8) TCPA having a minus sign when the ship already passed through the CPA. (always plus)
9) ARPA alarm if watchdog timer signal from the ARP is not received by the SPU boards.
(no alarm)
10) Target number of a lost target not being used until all target number are used once.
(using target number of lost target)
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