(b)  
P18 Load Control Center - Left
 1) ATC 1
 2) DADC LEFT
 3) ALTM CAPTAIN

 S 865-037
 (2)  Set these switches on the ATC control panel as follows:
 (a)  
transponder select switch - (system in test)

 (b)  
altitude reporting switch - OFF

 (c)  
Code select switch - 0000

 S 865-038
 (3)  On the test set, adjust the RCVR SENS to read 90%.
 (a)  Make sure the sensitivity is -73 |4 DBM.
 S 865-039
 (4)  Set the altitude reporting switch on the ATC control panel to the ON position.
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 S 865-149
 (5)  
Set the test set for MODE C.

 S 715-040

 (6)  
Do the sensitivity check again for MODE C.

 (a)  Make sure the sensitivity between MODE A and MODE C is less than 1 db.
 S 865-041
 (7)  
Disconnect the test set.

 S 435-042

 (8)  
Install the ATC antenna (Ref 34-53-11).

 S 735-043

 (9)  
Do the test above for the other ATC system (if installed).

 G. Code Reception and Sensitivity Test
 S 865-044
 (1)  Set the controls on the test set as follows:
 RCVR SENS - 65
 REPLY/SLS - LEVEL
 1090 MHz - 0
 MODE - 3/A
 Power - ON.

 (a)  Make sure the test set meter goes up to full scale and shows FR1 and FR2 (ATC transponder has reply to interrogation).
 S 865-136
 CAUTION:_______DO NOT USE CODES 7500, 7600-7677, 7700-7777. THESE ARE EMERGENCY CODES.
 (2)  Set the code switches on the ATC control panel to a desired ATC ID code.
 (a)  Make sure the test set receives and shows the same ATC ID code.
 S 865-046
 (3)  Push the identification switch on the ATC control panel.
 (a)  Make sure the test set shows a decimal point in its display.
 NOTE: To get the proper results, it may be necessary to move
____ the test set to a different position to receive sufficient signal strength. Also, adjust the test set frequency to equal the ATC transponder frequency. Do not adjust the frequency by more than |6 MHz.
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A 737-300/400/500MAINTENANCE MANUAL
 S 865-047
 (4)  Change the ATC ID code on the ATC control panel to its compliment. The compliment of the code is 7777 minus the code. This does a check of the full code capability of transponder.
 EXAMPLE: If the code is 0340, its compliment is:
 7777 - 0340 = 7437 compliment.
 S 865-144
 (5)  
Adjust the RCVR/SENS control so that the meter goes up about 1/4 scale.

 S 865-049

 (6)  
Adjust the 1090 MHz control above or below 0 for MAXIMUM meter movement. Maximum emor is |3 MHz.

 S 865-048

 (7)  
Set the REPLY/SLS switch to the 100% position.

 (a)  Make sure the transponder's reply rate is more than 90%.
 S 865-145
 (8)  To examine the SLS circuit of the transponder, position test set REPLY/SLS switch to 10%/0 dB.
 (a)  Make sure the transponder did not reply to the interrogations (REPLY should be 1.3% or less).
 NOTE: Some transponder may transmit a reply to an
____ interrogation with SLS pulse at 0 db. Move the test set closer to the transponder antenna to increase the signal strength.
 S 865-146
 (9) Set the test set SLS switch to -9 dB and READOUT switch to PILOT.
 NOTE: ATC code and framing pulses is shown.
____
 H. Altitude Reporting Test
 S 865-147
 (1)  Set the controls on the test set as follows:
　
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