S 864-011
(5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P18 Circuit Breaker Panel
1) C839, HF-1 AC
2) C346, HF-1 DC
(b)
P6 Circuit Breaker Panel
1) C857, HF-2 AC (if installed)
2) C477, HF-2 DC
D. HF Antenna Coupler Installation Test
S 864-035
WARNING: DO NOT TRANSMIT WITH THE HF COMMUNICATION SYSTEM WHILE THE
_______ AIRPLANE IS REFUELED OR DEFUELED. AN EXPLOSION CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE.
WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF 6 FEET AWAY FROM THE
_______ VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
(1)
Supply the electrical power (AMM 24-22-00/201).
S 864-013
(2)
Make sure the flight interphone system operates (AMM 23-51-00/501).
S 714-014
(3)
Do the operational test for the applicable HF communication system.
(a)
Connect the headset/boom microphone to the captain's jack panel.
(b)
Push and release the applicable HF switch on the captain's audio selector panel (ASP). 1) Adjust the HF sound control on the ASP if it is necessary.
(c)
Do these steps at the applicable HF communication control panel. 1) Set the mode switch to the applicable mode of operation (AM
or USB/LSB/SSB).
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A
737-300/400/500MAINTENANCE MANUAL
2) Set the mode select switch on the HF communication control panel to the applicable position (USB/LSB/SSB or AM) for HF system operation.
3) Set the RF SENS on the HF communcation control panel (or HF SENS on the RCP's) to a near maximum position. 4) Set the frequency display to an approved test frequency.
(d)
Push and release the captain's push-to-talk (PTT) switch.
1) Make sure you hear the 1-kilohertz sound from the headset while the antenna coupler tunes to the frequency.
(e)
Push and hold the PTT switch to speak to a radio operator. 1) Make sure you hear the sidetone when you transmit. 2) Make sure the quality of the transmitted and received voice
is satisfactory.
(f)
Set the mode select switch on the HF communication control panel to the OFF position.
E. Put the Airplane Back to Its Initial Condition
S 864-016
(1) Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
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A 737-300/400/500MAINTENANCE MANUAL
VHF COMMUNICATION SYSTEM - DESCRIPTION AND OPERATION____________________________________________________
1. General_______
A. The very high frequency (VHF) communication system provides short-range two-way voice and data communication in the frequency range of 118.000 through 135.975 MHz. The VHF communication system (referred to as the VHF system) receives VHF radio signals, processes them, and sends the resulting audio to audio integration. During transmission, microphone audio from audio integration is processed and transmitted by the VHF system.
B. Two or three VHF communication systems are installed on the airplane.
C. The communication (comm) equipment for each VHF system includes a VHF transceiver, a VHF control panel, and a VHF antenna. The VHF transceivers are installed in the electronic equipment bay, rack E2.
D. The VHF control panels are located on the aft electronics panel, P8.
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