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ADF SYSTEM - DIGITAL INTERFACE
EFFECTIVITY
SHZ ALL 34-57-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-006
Purpose
The ADF receiver calculates bearing to a station that transmits
in the frequency range of 190 Khz to 1750 Khz. The receiver also
receives station identifiers and AM broadcasts.
Description
The ADF receiver is a standard ARINC 600 3 MCU unit with
dimensions approximately 3.7 in. x 7.9 in. x 14.8 in. The receiver
weighs approximately 9 pounds and uses 115V ac 400 Hz power
for operation. The receiver has a non-volatile flight fault
memory. Only shop personnel can use this feature.
Test and Indication
There is a test switch on the front panel of the receiver. When
you push the test switch, a self test of the receiver starts. At the
end of the test, the status of the receiver and the control panel
inputs show on the front panel LED status indicators.
ADF SYSTEM - RECEIVER
EFFECTIVITY
SHZ ALL 34-57-00
Page 14
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-007
ADF SYSTEM - RECEIVER
ADF SYSTEM - RECEIVER
EFFECTIVITY
SHZ ALL 34-57-00
Page 15
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-007
Purpose
The ADF antenna receives electromagnetic signals from
ground stations. The sense antenna receives the electrical
part of the signal. The loop antenna receives the magnetic part
of the ground station signal.
Description
The antenna assembly is a one piece molded shell. The
antenna attaches to the airplane with 12 bolts. The antenna
assembly contains these components:
* Loop antenna elements (2)
* Sense antenna (1)
* Electronics assembly.
The ADF antenna electronics assembly contains amplifiers for
each of the antenna elements. The amplifiers receive 12v dc
power from the ADF receiver.
The electrical connectors connect the antenna assembly to the
ADF receiver.
The preferred resistance measurement point uses one of the
mounting bolt holes counterbore. There is also an alternate
resistance measurement point. The alternate measurement is
done from the inside of the airplane.
ADF SYSTEM - ANTENNA
EFFECTIVITY
SHZ ALL 34-57-00
Page 16
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-008
ADF SYSTEM - ANTENNA
ADF SYSTEM - ANTENNA
EFFECTIVITY
SHZ ALL 34-57-00
Page 17
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-57-00-008
Purpose
The ADF control panel supplies tune frequencies and system
mode selection to the ADF receiver.
Description
There are two frequency display windows. the windows show
the frequency that you set with the frequency selectors. There
are indicators in the display windows that show if the system is
in the ADF mode or the antenna (ANT) mode.
The tone selector turns on the beat frequency oscillator (BFO) in
the ADF receiver. There are some ADF stations that turn their
transmitters on and off to transmit their morse code station
identifier. To process this type of signal, the receiver must be in
the BFO mode. The selector has three positions, a position for
receiver 1, receiver 2, and off.
There are two frequency selectors. Each frequency selector
sets the frequency for the display window that is directly above
it. The selectors each have three controls. There is an outer,
middle, and inner control. The inner control sets the tenths and
ones numbers. The middle control sets the tens number. The
outer control sets the hundreds number.
The mode selector selects the ADF or ANT modes. In the ADF
position, the receiver sends bearing data and station audio. In
the ANT mode, the receiver sends only station audio.
The test switches are on the top of the ADF mode selectors.
Momentarily push the push button to start a system self test.
ADF SYSTEM - CONTROL PANEL
EFFECTIVITY
SHZ ALL 34-57-00
Page 18
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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