Level Radar, Adjust Power Supply and Center Current, and Synchronize
Precision Sweep
Introduction - mm50040006
Figure 2. Functions of radar set AN/FPN-40.
Introduction - Continued - mm50040008
Lesson. Level Radar, Adjust Power Supply and Center Current, and Synchronize Precision Sweep
Figure 3. Radar set AN/FPN-40. - mm50040010
Figure 4. Radar set group OA-2665/FPN-40.
Level Radar Set
Figure 6. Antenna pedestal subassembly AB-642/FPN-40, drive lock.
Figure 7. Radar set group OA-2665/FPN-40, leveling jacks.
Figure 8. Power supply PP-2489/FPN.
Figure 9. Control monitor C-2124A/FPN-33.
Figure 10. Antenna pedestal subassembly
Figure 11. Antenna pedestal subassembly AB-643/FPN-40,
Locate the Jam nuts on the cross arm spirit level.
Level the AN/FPN-40 radar set group.
Place SCAN switch (S4201) to the ON position (Figure 9).
Place SEARCH, PRECISION, HEIGHT FINDER switch (S4204) to PRECISION
Engage the azimuth drive-lock (Figure 6).
Adjust the two side leg leveling jacks
Rotate the AB-643/FPN-40 with the MOUNT POSITION switch
Figure 19. Radar set group OA-2665/FPN-40, rear jack.
You have completed the leveling of the AN/FPN-40 radar set group
Now, use this checklist to review the location
Learning Event 2. Adjust Output Voltages
Locate the following controls and components
Figure 22. P/O front panel of PP-1670/FPN-33.
Adjust the output voltages of PP-1670/FPN-33.
Figure 24. PP-1670/FPN-33 +105 V meter indication.
Place the METER SELECT switch S3201 to the +300 V position
Learning event 3. Adjust the 10 kV Power Supply
Locate the indicator, azimuth-elevation range,
Observe the 10 kV power supply meter.
Adjust 10 kV power supply PP-607/GPN on radar set AN/FPN-40.
The location and initial settings of the components and controls
Locate and disengage the release handles of the synchronizer-generator
Figure 30. Synchronizer-generator electronic marker
Adjust power supplies in synchronizer-generator
Connect a multimeter between ground test point TP1514
Connect the multimeter between the +6 V DC test point TP1510
Connect the multimeter using the 50 V DC scale
Connect the multimeter between the +12 V DC test point TP1513
Connect the multimeter between the +45 V DC test point TP1518
Connect the multimeter between the -45 V DC test point TP1519
Learning Event 5: Adjust 1500 CPS
Figure 37. RT group OA-2667/FPN-40.
Figure 38. Component drawer handles.
Figure 39. Radar receiver chassis.
Figure 40. Radar receiver synchronizer assembly.
Figure 41. Synchronizer assembly.
Locate the receiver R-981/FPN-40 chassis interlock
Adjust the 1500 CPS voltage level of radar set AN/FPN-40.
Connect the vertical input of the oscilloscope to TP-3001
Observe the peak-to-peak voltage of the 1500 CPS signal (Figure 44).
Learning Event 6: Adjust the Centering Current
Locate the SCAN ON/OFF switch on the front panel of panel
Locate the vertical and horizontal sweep amplifier
Adjust the centering current of radar set AN/FPN-40.
Adjust the centering current of radar set AN/FPN-40. - Continued
While adjusting the OFF CENTERING VERT control R-1502
On the vertical sweep amplifier, adjust LEVEL ADJ
Learning Event 7. Align Angle Volts
Locate the precision drive handwheel on antenna pedestal subassembly
Locate and identify antenna pedestal subassembly AB-644/FPN-40
Locate the clinometer on the elevation antenna
Warning
Locate the spirit level and bubble of clinometer
Locate the following parts on the clinometer
Figure 56. Clinometer POS/NEG degree settings.
Figure 57. Clinometer setting.
Figure 59. Clinometer dial.
Figure 60. Control indicator group OA-2664/FPN-40.
Figure 61. Control radar set C-2074/FPN-33 front panel.
Figure 62. Navigational computer CP-338/FPN-40, front panel.
Locate and release the locking handles of the computer chassis
Locate the following controls and test points on the computer chassis (Figure 64).
Figure 64. Navigational computer CP-338/FPN-40, inside-top.
Align the AN/FPN-40 angle volts demodulator of radar set AN/FPN-40.
Figure 65. DEMOD LEVEL adjust connection.
You have completed the angle volts demodulator alignment
Now, use this checklist to review the location of the following components and controls.
Learning Event 8: Align AZ Angle Data
Figure 66. Synchro housing.
Figure 67. Azimuth angle data resolver.
Perform the following on power supply
You have completed the azimuth angle data resolver alignment.
Introduction - mm50040006
Figure 2. Functions of radar set AN/FPN-40.
Introduction - Continued - mm50040008
Lesson. Level Radar, Adjust Power Supply and Center Current, and Synchronize Precision Sweep
Figure 3. Radar set AN/FPN-40. - mm50040010
Figure 4. Radar set group OA-2665/FPN-40.
Level Radar Set
Figure 6. Antenna pedestal subassembly AB-642/FPN-40, drive lock.
Figure 7. Radar set group OA-2665/FPN-40, leveling jacks.
Figure 8. Power supply PP-2489/FPN.
Figure 9. Control monitor C-2124A/FPN-33.
Figure 10. Antenna pedestal subassembly
Figure 11. Antenna pedestal subassembly AB-643/FPN-40,
Locate the Jam nuts on the cross arm spirit level.
Level the AN/FPN-40 radar set group.
Place SCAN switch (S4201) to the ON position (Figure 9).
Place SEARCH, PRECISION, HEIGHT FINDER switch (S4204) to PRECISION
Engage the azimuth drive-lock (Figure 6).
Adjust the two side leg leveling jacks
Rotate the AB-643/FPN-40 with the MOUNT POSITION switch
Figure 19. Radar set group OA-2665/FPN-40, rear jack.
You have completed the leveling of the AN/FPN-40 radar set group
Now, use this checklist to review the location
Learning Event 2. Adjust Output Voltages
Locate the following controls and components
Figure 22. P/O front panel of PP-1670/FPN-33.
Adjust the output voltages of PP-1670/FPN-33.
Figure 24. PP-1670/FPN-33 +105 V meter indication.
Place the METER SELECT switch S3201 to the +300 V position
Learning event 3. Adjust the 10 kV Power Supply
Locate the indicator, azimuth-elevation range,
Observe the 10 kV power supply meter.
Adjust 10 kV power supply PP-607/GPN on radar set AN/FPN-40.
The location and initial settings of the components and controls
Locate and disengage the release handles of the synchronizer-generator
Figure 30. Synchronizer-generator electronic marker
Adjust power supplies in synchronizer-generator
Connect a multimeter between ground test point TP1514
Connect the multimeter between the +6 V DC test point TP1510
Connect the multimeter using the 50 V DC scale
Connect the multimeter between the +12 V DC test point TP1513
Connect the multimeter between the +45 V DC test point TP1518
Connect the multimeter between the -45 V DC test point TP1519
Learning Event 5: Adjust 1500 CPS
Figure 37. RT group OA-2667/FPN-40.
Figure 38. Component drawer handles.
Figure 39. Radar receiver chassis.
Figure 40. Radar receiver synchronizer assembly.
Figure 41. Synchronizer assembly.
Locate the receiver R-981/FPN-40 chassis interlock
Adjust the 1500 CPS voltage level of radar set AN/FPN-40.
Connect the vertical input of the oscilloscope to TP-3001
Observe the peak-to-peak voltage of the 1500 CPS signal (Figure 44).
Learning Event 6: Adjust the Centering Current
Locate the SCAN ON/OFF switch on the front panel of panel
Locate the vertical and horizontal sweep amplifier
Adjust the centering current of radar set AN/FPN-40.
Adjust the centering current of radar set AN/FPN-40. - Continued
While adjusting the OFF CENTERING VERT control R-1502
On the vertical sweep amplifier, adjust LEVEL ADJ
Learning Event 7. Align Angle Volts
Locate the precision drive handwheel on antenna pedestal subassembly
Locate and identify antenna pedestal subassembly AB-644/FPN-40
Locate the clinometer on the elevation antenna
Warning
Locate the spirit level and bubble of clinometer
Locate the following parts on the clinometer
Figure 56. Clinometer POS/NEG degree settings.
Figure 57. Clinometer setting.
Figure 59. Clinometer dial.
Figure 60. Control indicator group OA-2664/FPN-40.
Figure 61. Control radar set C-2074/FPN-33 front panel.
Figure 62. Navigational computer CP-338/FPN-40, front panel.
Locate and release the locking handles of the computer chassis
Locate the following controls and test points on the computer chassis (Figure 64).
Figure 64. Navigational computer CP-338/FPN-40, inside-top.
Align the AN/FPN-40 angle volts demodulator of radar set AN/FPN-40.
Figure 65. DEMOD LEVEL adjust connection.
You have completed the angle volts demodulator alignment
Now, use this checklist to review the location of the following components and controls.
Learning Event 8: Align AZ Angle Data
Figure 66. Synchro housing.
Figure 67. Azimuth angle data resolver.
Perform the following on power supply
You have completed the azimuth angle data resolver alignment.
