S 735-075

 (26)
 Do a check of the DIVERSITY TEST.

 (a)  Make sure the power level difference is  20dB between 'on' antenna squitters and 'off' antenna squitters.
 NOTE: To make sure the dynamic range is  20dB, a
____ diversity test must be run at a distance of less than 50 feet (15.2 meters) from the airplane antenna.
 S 735-076
 (27) Do a check of the MTL DIFFERENCE TEST.
 (a)  Make sure the Minimum Threshold Level (MTL) difference between mode A and mode C is  1.0dBm.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH MODE S ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-173
 (28)
 Push the PWR TEST key on the test set.

 S 865-174

 (29)
 Use the SELECT key on the test set and select the bottom antenna.

 NOTE: Make sure the top ATC antenna is not in the line of sight of
____
 the test set antenna during the POWER TEST.

 S 865-175
 (30)
 Push the antenna push button switch.

 S 865-176

 (31)
 Slowly move the test set antenna 3 feet vertically from the ground, at less than 1 FT/SEC (30 CM/SEC).

 S 865-177

 (32)
 Push the antenna push button switch a second time to stop the test when the test set antenna is approximately 6 feet high.

 S 735-077

 (33)
 Do a check of the POWER TEST.

 (a)  Make sure the peak power output of the transponder is between 125W (ERP = 51.0 dBm) and 500W (ERP = 57.0 dBm).
 NOTE: Effective Radiated Power (ERP) is the product of the
____ antenn output power and antenna gain.
 (b)  Make sure the Minimum Threshold Level (MTL) sensitivity is -74dBm (|3dBm).
 NOTE: An additional 3dBm loss is allowed to compensate for
____ antenna coupling errors. Also, make sure to correct for other factors that would change the sensitivity measurement.
 (c)  Make sure the test set shows PASSED for the BOT AVG (dBm).
 S 865-178
 (34)
 Insert the antenna shield over the bottom ATC antenna.

 S 865-179

 (35)
 Move the test set so that it is in the line of sight of the top ATC antenna.

 S 865-180

 (36)
 Push the SETUP key on the test set.

 (a)  
Enter the appropriate range for the top antenna.

 (b)  
Choose the top antenna on the SELECTED field.

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A
737-300/400/500MAINTENANCE MANUAL
 S 865-181
 (37)
 Push the PWR TEST key on the test set.

 S 865-182

 (38)
 Use the SELECT key on the test set and select the top antenna.

 S 735-183

 (39)
 Do a check of the POWER TEST.

 (a)  Make sure the peak power output of the transponder is between 125W (ERP = 51.0 dBM) and 500W (ERP = 57.0 dBm).
 NOTE: Effective Radiated Power (ERP) is the product of the
____ antenna output power and antenna gain.
 (b)  Make sure the Minimum Threshold Level (MTL) sensitivity is -74dBm (|3dBm).
 NOTE: An additional 3dBm loss is allowed to compensate for
____ antenna coupling errors. Also, make sure to correct for other factors that would change the sensitivity measurement.
 (c)  Make sure the test set shows PASSED for the TOP AVG (dBm).
 S 715-184
 (40) Do the system test again for the right or No. 2 ATC system and use the right or No. 2 air data source.
 NOTE: On the test set, select the TOP ATC antenna.
____
 G. Put the Airplane Back to Its Usual Condition
 S 845-185
 (1)  
　
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