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* Provide extended interactive mode support for
troubleshooting data when LRU is removed from the
airplane
* Monitor and decode the morse code station identification
data from the Signal processor
* Format the station ident word
* Format the LRU ident message.
ADF SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The signal processor receives the conditioned analog data from
the tuner section and compares the signal to a 95 Hz reference
signal to compute the station bearing and station identification
and sends it to the system processor. The signal processor also
sends audio and station identifier tones to the audio amp in the
A4 receiver assembly that sends it to the REU.
The system processor receives all data bus and discrete inputs
that come into the ADF receiver. The processor uses ADF
control panel tune data to tune the antenna modulators and
synthesizer. It sends the QEC program pin configuration to the
signal processor to compensate for QEC. It also processes the
air/ground and antenna mount discrete for memory. The signal
processor receives the bearing computation and detected ident
codes from the signal processor, formats the bearing data
word, and sends the data out on two data buses. Output 1 goes
to the RMI and output 2 goes to the DEUs.
Power
The ADF receiver power supply receives 115v ac, 400 Hz power
from the ADF control panel. The power supply provides -12v dc,
+12v dc, and +5v dc for internal use. The modulators send the
12v dc power outputs to the ADF antenna for operation.
Test
When you push the test switch on the ADF receiver front panel,
the system processor starts a test of internal functions and
checks the ADF control panel data word input. The antenna
modulator removes power to the antenna assembly amplifiers.
This causes no RF signal inputs to the antenna modulators. A
test RF signal replaces the antenna RF input and the receiver
sends the signal through its internal circuits. Test results show
on the front panel LED status indicators.
ADF SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 34-57-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-010
ADF SYSTEM - FUNCTIONAL DESCRIPTION
ADF SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
SHZ ALL 34-57-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-010
EFIS Control Panel
The ADF bearing data can show on the NAV display in the VOR,
APP, and MAP modes. You use the mode selector on the EFIS
control panel to select the display mode for the NAV display.
The VOR/ADF switches select the VOR system or the ADF
system as the source of the bearing pointer data on the NAV
display. To show ADF bearing, set the VOR/ADF switches on
the EFIS control panels to the ADF position.
Audio Control Panel Controls
The audio control panels (ACP) let the crew listen to ADF station
audio or the morse code station identifier. You use the ACP ADF
receiver switches to listen to ADF receiver audio.
The voice/range selector permits you to listen to only voice
audio in the voice (V) position. The range (R) position permits
you to listen to the station morse code identifier. With the
selector in the both (B) position, you can listen to both the voice
audio and the morse code station identifier.
Navigation aid stations transmit their morse code identifier
signals on a typical 1020 Hz signal. There are some ADf stations
that transmit their morse code identifier on a 400 Hz signal. The
voice/range selector has no effect on these stations, the station
morse code identifier will always be present.
ADF SYSTEM - CONTROLS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-011
ADF SYSTEM - CONTROLS
ADF SYSTEM - CONTROLS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-011
General
　
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