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 NOTE : To measure antenna diversity or isolation, refer to the Diversity
____
 testing procedure given in the test-bench user manual.
 6. Set the test set (or bench) for:  On the test set:
 - SLS (Side Lobe Suppression)  The results must show:
 test
 - SLS: -9 dB  - MODE A: 5555 and MODE C: Z,ZZZ
 - SLS: 0 dB  - MODE A: no reply (or PASS) and MODE
 C: no reply (or PASS)
 7. Set the test set (or bench) for:  On the test set:
 The results must show:
 - INVALID ADDRESS/UNDESIRED REPLY  - MODE S ADDRESS: no reply
 MODE S test
 8. On the center pedestal, on the  On the test set:
 ATC control unit:  The results must show:
 - set the ALT RPTG/ON/OFF switch
 to OFF
 Set the test set (or bench) for:
 - interrogation in MODE C  - MODE C: no Altitude Value
 9. On the center pedestal, on the  On the test set:
 ATC control unit:  The results must show:
 - set the ALT RPTG/ON/OFF switch
 to ON
 - push the IDENT pushbutton
 switch
 Set the test set for:
 - interrogation in MODE A  - the ident pulse is transmitted for a
 minimum of 20 seconds. 

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ACTION RESULT -------------------------------------------------------------------------------10. Put the aircraft back to ground On the test set: configuration (Ref. TASK 32-00-The results must show: 00-860-002)
 Set the test set (or bench) for:
 - interrogation in MODE A  - MODE A: no reply
 - interrogation in MODE C  - MODE C: no reply
 - interrogation in MODE S  - MODE S aircraft code: XXXXXX - Flight number/Flight ID - Acquisition Squitters: (PERIOD is between 0.8 second and 1.2 seconds in DF 11 format). - Aircraft status: Ground 
R  **ON A/C 106-149, 221-299, 301-399, 401-499, 
R  Subtask 34-52-00-720-064-A 
R  A. Functional Test of the ATC MODE S 
R R  NOTE : Do the test for the system 1.____ Then, do the test for the system 2. 
R R R  NOTE : There are many different types of test benches. This procedure____ gives a typical test sequence. The test sequence can change with the test bench used. 
R R R  NOTE : For Elementary Surveillance (ELS) and Enhanced Surveillance (EHS)____ capable transponders, use an Extended Squitters (ES) capable test set.

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R  1. Set the test set (or bench) for:  On the test set: 
R  The results must show: 
R  - interrogation MODE A  - MODE A code: 5555 
R  - interrogation MODE A ONLY  - MODE A code: 5555 and MODE S: no 
R  reply 
R  2. Set the Test set (or bench) for:  On the test set: 
R  The results must show: 
R  - interrogation MODE C  - MODE C code: Z,ZZZ ft (Z,ZZZ is a 
R  number that shows approximately the 
R  local field elevation). 
R  - interrogation MODE C ONLY  - MODE C code: Z,ZZZ ft (Z,ZZZ is a 
R  number that shows approximately the 
R  local field elevation) and MODE S: no 
R  reply 
R  3. Set the test set (or bench) for:  On the test set: 
R  The results must show: 
R  - interrogation MODE S  - MODE S aircraft code: XXXXXX (the 
R  aircraft code has 6 digits and agrees 
R  with the 24-bit Mode S address). 
R  - Mode A in DF 5 format (and DF 21 
R  format if available) 
R  - MODE C in DF 4 format (and DF 20 
R  format if available) 
R  - Flight number/Flight ID 
R  - Acquisition Squitters: (PERIOD is 
R  between 0.8 second and 1.2 seconds in 
R  DF 11 format). 
R  - Aircraft status: Flight (or Air) 
R  4. Set the test set (or bench) for:  On the test set: 
R  The results must show: 
R  - POWER test  - POWER: POWER is more than or equal to 
R  125 W and less than or equal to 500 W 

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