3.Adjust R21 on the INT Board so the value of TP6 is 4 Vpp. (For remote dis- play, adjust R134 on the INT Board.)
TP1
R134
TP6
R21
INT Board (03P9252)
Figure 3-1 Display pedestal
3.4 Heading Alignment
You have mounted the scanner unit facing straight ahead in the direction of the bow. Therefore, a small but conspicuous target dead ahead visually should ap- pear on the heading line (zero degrees).
In practice, you will probably observe some small bearing error on the display because of the difficulty in achieving accurate initial positioning of the scanner unit. The following adjustment will compensate for this error.
Correct bearing | a | Apparent position | b |
relative to heading |
| of target |
|
a | Target | 320 | 350 | 000 | 010 | 040 | b | Target |
|
| 340 | 020 |
|
| |||
|
| 330 |
|
|
| 030 |
|
|
|
| 310 |
|
|
| 050 |
|
|
|
| 300 |
|
|
| 060 |
|
|
|
| 290 |
|
|
| 070 |
|
|
|
| 280 |
|
|
| 080 | Apparent |
|
|
| 260 |
|
|
| 100 |
| |
|
| 270 |
|
|
| 090 |
|
|
|
| 250 |
|
|
| 110 | position |
|
|
| 240 |
|
|
| 120 | of target |
|
|
| 230 |
|
|
| 130 |
| |
|
| 220 |
|
|
| 140 |
|
|
|
| 210 |
|
|
| 150 |
|
|
|
| 200 | 190 | 180 | 170 | 160 |
|
|
Scanner mounted | Picture appears | Scanner mounted |
error to port | deviated clockwise. | error to starboard |
(HDG SW advanced) |
| (HDG SW delayed) |
Figure 3-2 Heading alignment
340 | 350 | 000 | 010 | 020 |
|
330 |
|
|
| 030 |
|
320 |
|
|
| 040 |
|
310 |
|
|
| 050 |
|
300 |
|
|
| 060 |
|
290 |
|
|
| 070 |
|
280 |
|
|
| 080 |
|
270 |
|
|
| 090 | Correct |
260 |
|
|
| 100 | |
250 |
|
|
| 110 | bearing |
240 |
|
|
| 120 | relative to |
230 |
|
|
| 130 | |
220 |
|
|
| 140 | |
|
|
| heading | ||
210 |
|
|
| 150 | |
200 | 190 | 180 | 170 | 160 |
Picture appears
deviated counterclockwise.
1.Press [RADAR MENU] [0] [0] [0] [2] [2] to select HL ALIGN on the INITIAL SETTING1 menu.
2.Select a target echo (by gyrocompass, for example) at a range between 0.125 and 0.25 nm, preferably near the heading line.
3.Operate the EBL control to bisect the target echo with the heading line. (The value shown on the display is scanner position in relation to ship's bow.)
4.Press [ENTER] to finish.
