**[ARSR-4/BI-6 Collimation Instructions]{.underline}**

Procedure 1: Collimation with either rotary joint

1.  Registration must be performed before this procedure. This procedure
    requires downtime.

2.  At the BI-6, run collimation with beacon 1/2 nautical mile offset
    enabled to determine search azimuth and range offset.

3.  Calculate search azimuth offset in iACP (16384 iACP per 360
    degrees).

4.  At the LDC, log in and take control.

5.  Go to menu 5.1. Add search azimuth offset to both NORTHMARK OFFSET
    FOR APG1 and NORTHMARK OFFSET FOR APG2. Increasing these numbers
    moves the search targets clockwise. Change only the highlighted
    numbers shown in Figure 1.

6.  Hit CTRL-D and change the offsets.

7.  In the BEACON/RADAR AZIMUTH OFFSET field, reenter the existing
    number. All three parameters should have an asterix to the side
    indicating they have been changed.

8.  Hit CTRL-C to get back to the command mode.

9.  Hit the LOCAL PRINT button to print this menu.

10. Select option 1 to load changes.

11. Go to menu 1.2.5.

12. Swap synchronizers by putting the one that is online into STBY. This
    step is necessary to force the ARSR-4 to load the new northmark
    offsets into the hardware.

13. Go to menu 5.2.5.3, RANGE COMPUTATION PARAMETERS.

14. For each RANGE BIAS number, add the search collimation range offset
    in NMI.

15. Hit CTRL-D and change the offsets. Change only the numbers
    highlighted in Figure 2.

16. Hit CTRL-C to get back to the command mode.

17. Hit the LOCAL PRINT button to print this menu.

18. Hit CTRL-T. Select option 9 to load the range bias changes.

19. The search collimation parameters have now been changed. These
    cannot be left in permanently until the ATCBI-6 is commissioned and
    the ATCBI-5 is de-commissioned.

20. A cold start must be performed before the ARSR-4 is restored to
    service.

> Figure 1. Menu 5.1, Search Azimuth Collimation Parameters
>
> 5.1 ANTENNA PARAMETERS
>
> NORTHMARK OFFSET FOR APG1: **-79** (-2048 TO 2047 iACPs)
>
> NORTHMARK OFFSET FOR APG2: **-122** (-2048 TO 2047 iACPs)
>
> BEACON/RADAR AZIMUTH OFFSET: **135** (0 TO 137 iACPs)
>
> TEST TARGET CABLE LOSSES FOR MDS CALCULATION (0 TO 99.9 dB)
>
> BEAM ROW dB LOSS BEAM ROW dB LOSS
>
> F1 F2 F1 F2
>
> LD 2 59.0 58.1 5 13 58.0 61.2
>
> 1 8 59.0 59.6 6 14 57.8 59.9
>
> 2 9 57.8 59.2 7 16 58.7 59.9
>
> 3 10 57.7 59.4 8 18 58.5 59.2
>
> 4 11 58.5 59.4 9 21 58.8 59.2
>
> 1\. LOAD CHANGES
>
> 2\. PURGE CHANGES
>
> Figure 2. Menu 5.2.5.3. Search Range Collimation Parameters
>
> 5.2.5.3 RANGE COMPUTATION PARAMETERS
>
> RANGE RESOLUTION
>
> RANGE BIAS THRESHOLD
>
> (-5 TO 5 NMI @ 0.0625) (0 TO 48 dB @ 0.09375)
>
> LOW STACK:
>
> MODE: FIXED BAM PAM FIXED BAM PAM
>
> VIP NORMAL **0.0000 0.0000 0.0000** 9.00000 9.00000 9.00000
>
> VIP MTI **0.0000 0.0000** 9.00000 9.00000
>
> STAC NORMAL **0.0000 0.0000 0.0000** 9.00000 9.00000 9.00000
>
> STAC MTI **0.0000 0.0000** 9.00000 9.00000
>
> HIGH STACK:
>
> MODE: FIXED BAM PAM FIXED BAM PAM
>
> VIP NORMAL **0.0000 0.0000 0.0000** 9.00000 9.00000 9.00000
>
> STAC NORMAL **0.0000 0.0000 0.0000** 9.00000 9.00000 9.00000
>
> HELP VIEW GO TO ENTER RUNLG
>
> ALARMS MAIN DATA ENAB