Furuno FAR-2107 Series Service Manual page 453

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4-5 Automatic FTC (AUTO RAIN)

This setting is made in FTC OFF/1/2/3/4 of the [PICTURE] box menu.

The input signal A is subjected to the processing of moving average deviation. In this

processing, the range of the distance to be extracted is deviated in one sweep and signal

levels of respective distances extracted are averaged.

Averaged signals are multiplied by the coefficient K determined by the FTC setting. The

signal B is subtracted from the input signal A to create the signal C. The signal C is

STC-processed (curve of 1/Square of distance) and outputted. The FTC control knob is

used for adjusting the STC level. The effect of FTC is larger as the FTC setting value is

larger and as FTC VR is turned clockwise.

Fig. 7.3.18 Schematic diagram of moving average deviation processing

Moving average

Rain/snow echo

Fig. 7.3.17 Schematic diagram of AUTO FTC

Moving average

deviation Output

7.3 Processor Unit (RPU-013)

(A/C RAIN VR)