TM 11-5840-360-14-1-1
Appendix A
12 & 16 Inch Compass Adapter
1. GENERAL
The Compass Adapter, a synchro to stepper converter (P/N 169153-1 thru 169153-7) is designed to convert 360:
1, 180:1, or 36:1 ship's gyro output in the form of synchro data transmission for use with the stepper input required by the
indicator when the True Bearing Kit (TBK) and/or North Stabilization Kit (NSK) options are installed. General information
regarding operation, installation, and maintenance may be found in the instruction manual furnished with the radar
system. Conversion instructions relating to the NSK option are presented in Attachment A to this document. Instructions
relative to converting to the TBK system are given in Attachment B. Tables 1 and 2 should be referred to when ordering
replacements.
2. OPERATION
There are no operating procedures; once the unit is installed, there is no further adjustment necessary. The
control panel contains the ON/OFF power switch, a pilot light indicating power, and two fuses for ship's power. Fuses for
the output lines are located on the internal printed circuit board.
3. NSTALLATION
Prior to installing the converter, verify that both Indicator and Antenna power is turned off at the source.
The adapter should be installed in the cable run between the indicator, or indicators, and the gyro. The second
indicator is wired in parallel with the first indicator. Refer to Figures 1, 2 and 3 for proper hook-up and mounting details.
Figure 4 is the schematic diagram for the compass adapter.
4. ALIGNMENT
After hook-up, turn the system on and manually line up the true bearing ring to correspond to the gyro repeater setting.
Use "HDG SET" control to align the NSK to the gyro compass setting. Manually process the ship's gyro to verify that the
TB and NSK ring are following the gyro.
NOTE
Indicator circuitry must be modified per Attachments A and B to be compatible with the 28 volt
compass adapter output.
A-1
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