Furuno FR1510 MK 3 Radar SPU Board Function

1) Contains a video amplifier circuit.

       (a) Applies GAIN, STC, FTC and IR to video signal and outputs to the A/D
converter.
                 (b) Adjusts video signal input level (EEPOT).
                 (c) Changes STC curve according to the antenna height set on the Radar menu.
                  (d) Echo Stretching 1
2) Performs A/D conversion of video signal. (16 gradation)
3) Echo averaging. (EAV 1/2/3)
4) Constructs radar picture from HD, BP, TRIG, and VIDEO signals.
5) Controls keyboard.
6) Mixes data being fed from ARP and RP boards to display them on the screen.
7) Displays navigation data being fed from a navigator.
8) Reads and displays trackball, EBL, and VRM data.
9) Controls tuning circuit.
10) Outputs Tx trigger and pulselength signals to antenna unit.
11) Backs up menu settings, tune voltage, and tune Ind. voltage, with the EEPROM.
12) Echo Stretching 2/3.
13) Generates menus.
14) Echo trailling.
15) Checks for the presence of ARP and RP boards at power-up.
16) Outputs HD, BP, TRIG and VIDEO signals for radar slave display. (J204)
17) Receives HD, BP, TRIG and VIDEO signals from other radar. (J205)
18) Outputs ARPA data to the external equipment. (ARP-10:NMEA 0183, TTM,
J202)
19) Outputs external buzzer signal. (J211)
20) Outputs V-SYNC, H-SYNC, R, G, B to a PC monitor or hard copier. Abuffer
circuit required. (03P9229)
21) Inputs speed log signal, contact-closure. (J210)
22) TWO NMEA input ports. (J202, J203)
23) ONE NMEA output port. (J202)