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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
The antennas send the interrogation signals to the transponder.
The signals go through the diplexer circuits to two receivers.
The 1030 MHz interrogation signal mixes with a 1090 MHz
signal from the 1090 MHz oscillator. This makes an intermediate
frequency signal that the signal processor uses.
Suppression
When the transponder gets a suppression pulse from another
system, the signal processor circuits do not permit the receiver
circuits to operate.
Antenna Select
The antenna select circuit chooses the diplexer and antenna
that supplies the strongest receiver signal. The transmission of
the reply signal goes through the selected diplexer and
antenna.
Signal Processor
The signal processor determines if the transponder receives a
valid interrogation signal. It also determines the correct reply
mode; mode A, mode C, or mode S.
ATC SYSTEM - TRANSPONDER RECEIVE FUNCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ATC SYSTEM - TRANSPONDER RECEIVE FUNCTION
ATC SYSTEM - TRANSPONDER RECEIVE FUNCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Transmit
The central processor unit (CPU) controls the transponder to
reply to a mode A, mode C, or mode S interrogation. The mode
format circuits use the identity code, airplane altitude and the
unique 24-bit airplane address from the memory to format the
data for the reply signals.
The mode A reply contains the airplane identity code.
The mode C reply contains the airplane altitude.
The mode S replies contain a unique 24-bit airplane address,
identity code, altitude information, and TCAS information.
After the signal processor chooses the correct mode for the
reply data, the modulator makes a reply signal in that format.
The modulator uses the signal processor output to modulate a
1090 MHz carrier to make the transmission reply signal. The
transmission reply signal goes to the power amplifier and then
to the diplexer and to the ATC antenna.
The antenna select circuit makes the transmission signal go to
the antenna that receives the strongest interrogation signal.
Test
When you apply power or do a test of the ATC transponder
system, the built-in test equipment (BITE) does a check of the
operational status of all the internal circuits and for the correct
antenna impedance. The BITE circuits identify any failures and
put them into the non-volatile memory.
The LEDs on the front panel of the transponder come on to
report these conditions:
* Transponder status
* Antenna status
* Transponder control interface status
* Altitude interface status.
ATC SYSTEM - TRANSPONDER TRANSMIT FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ATC SYSTEM - TRANSPONDER TRANSMIT FUNCTIONAL DESCRIPTION
ATC SYSTEM - TRANSPONDER TRANSMIT FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
Use the ATC/TCAS control panel to select the active ATC
system. When you do this, the ATC/TCAS control panel sends a
discrete open or ground to the top and bottom ATC coax
switches. This connects the ATC transponder 1 or the ATC
transponder 2 to the top and bottom ATC antennas.
ATC 1 System Select or Standby
When the airplane power is on and when the ATC/TCAS control
panel has the ATC transponder 1 selected, the S1 switches
energize. This removes the ground to relays R1 and R2. They
do not energize. The top and bottom antennas connect to ATC
transponder 1.
ATC 2 System Select
With the ATC transponder 2 selected, switch S1 deenergizes to
supply a ground to energize relay R1 and R2. The top and
bottom antennas connect to the ATC transponder 2.
ATC SYSTEM - ANTENNA COAX SWITCH CONTROL
EFFECTIVITY
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