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4-6
Figure 4-7 Video signal timing
4.6 Suppressing Main Bang
If the main bang appears at the screen center, suppress it as follows:
1. Turn on the power. Transmit on a long range and then wait ten minutes.
2. Adjust [GAIN] control to show a slight amount of noise on the display.
3. Select the 0.25 nm range. Adjust the [A/C SEA] control to suppress sea clutter.
4. Press [MENU] [0] [0] [0] [0] [6] [6] to open the SET UP 1 menu.
5. Press the [5] key to select MBS-T.
6. Adjust the VRM control to adjust timing and then press the [ENTER/SELECT] key.
7. Press the [6] key to select MBS-L.
8. Adjust the VRM control to adjust level and then press the [ENTER/SELECT] key.
4.7 Confirming Magnetron Heater Voltage
Magnetron heater voltage is adjusted at the factory with a 15 m signal cable. Therefore,
when the signal cable is longer than 15 m, confirm that magnetron heater voltage is
within the prescribed rating as follows:
1. Disconnect P821 from the scanner unit.
2. Press [MENU] [0] [0] [0] [0] [6] [6] [0] [0] [9] [9] to open the OTHER menu.