(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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(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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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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