ARP board adjustment
1.Turn the GAIN, A/C SEA and A/C RAIN controls fully counterclockwise, and then transmit on the 12 nm range.
2.Connect a digital multimeter between TP7(+) and
TP7 | TP6 | R104 R103 |
| ||
Figure | ||
3.Adjust R104 on the ARP Board so the multimeter reads between 0.09 and 0.14 VDC.
4.Set controls and switches as below.
GAIN: fully clockwise (max.)
Interference rejector: OFF
Range: 24 nm
Echo stretch: OFF
5.Press [RADAR MENU] [0] [0] [0] [0] open the INITIAL SETTING3 menu.
6.Set the VIDEO SIG field to DIGITAL and press [ENTER].
7.Adjust R103 on the ARP Board so noise just appears on the display.
Too little noise | Proper noise | Too much noise |
Figure 4-7 How to adjust noise
8. Set VIDEO SIG to ANALOG and press [ENTER].