Turning Operation - Furuno FAR-2107 Series Service Manual

Marine radar/arpa

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7.2.7 Turning operation

1. Automatic tuning operation

The automatic tuning operation includes full search and small search. In these automatic

tuning operations, a start command sent from the SPU board is executed on the RFC

board to control tuning voltage of the MIC. After searching is complete, tracking

operation starts to find the maximum tuning point at all times. Changing tuning voltage

changes local frequency in the MIC. The maximum point of tuning is where the output

frequency of the MIC is converted to the IF frequency of 60 MHz.

A start command, manual setting values, tuning indicator signal (TUNE IND), and MIC

monitor signal (D-MONI signal) presented in a self-test are sent and received using

serial data between the SPU board and RFC board.

Fig. 7.2.17 Schematic Diagram of TUNE Control

The tuning value obtained in full search and small search is saved at U27 (SRAM) of

the RFC board. Searching is performed based on TUNE IND signals.

TUNE Initialize

Fig. 7.2.18 TUNE Control

7.2 Antenna Unit

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