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 E.  The VHF No. 1 antenna is mounted on the top centerline of the fuselage. The VHF No. 2 antenna is mounted on the bottom forward centerline of the fuselage. The VHF No. 3 antenna (if installed) is mounted on the bottom aft centerline of the fuselage.
 F.  The VHF systems interface with the audio integration (AMM/23-51-00/001) and the SELCAL (selective calling) system (AMM/23-28-00/001).
 G.  Figure 1 shows the VHF system component locations.
 2.  Control Panel
_____________
 A.  The VHF control panel provides frequency selection and indication.
 B.  On the front of the VHF control panel are two sets of concentric frequency select knobs, two frequency displays, a transfer (TFR) switch, and (if installed) a COMM TEST switch.
 C.  The frequency selector knobs are two concentric knobs used to select the desired frequency. The outer knob varies the ones, tens, and hundreds of MHz. The inner knob varies the tenths and hundredths of MHz.
 D.  The COMM TEST switch disables transceiver squelch. When pressed, an audio tone or an increase in background noise is heard over the interphone headset.
 E.  The TFR switch allows one frequency to be preselected while operating on a different frequency. A bar will appear across the inactive frequency.
 F.  SOME AIRPLANES (SEE FIG. 1 FOR EFFECTIVITY); A light will come on above the active frequency display of the VHF control panel.
 3.  Transceiver
___________
 A.  Collins 618M-3/3A VHF Transceiver
 (1)  The 618M-3/3A VHF transceiver is a solid state transceiver. The VHF transceiver provides 2-way voice and data communications in the 118.000- through 135.975-MHz frequency range for the -3 transceivers and in the 116.000 MHz through 151.975 MHz frequency range for the -3A transceivers.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

ELECTRONIC EQUIPMENT RACK, E2

SQUELCH  TRANSMIT 
DISABLE  POWER 
PHONE  MIC 
618M-3 

 

 

BEJ B-2531,B-2532 ALL EXCEPT BEJ B-2531,B-2532
VHF Communication Systems Component Location Figure 1 (Sheet 1)

A55428
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

VHF ANTENNAS

VHF Communication Systems Component Location
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  The front panel of the VHF transceiver is fitted with a SQUELCH DISABLE switch, a TRANSMIT POWER light, a PHONE jack, and a MIC jack. The SQUELCH DISABLE switch disables the transceiver squelch circuits and provides a test of the receiver section. The TRANSMIT POWER light comes on when the transmitter output is greater than 10 watts. The PHONE and MIC jacks are provided to connect a microphone and headset directly to the VHF transceiver.
 4.  VHF Antenna___________
 A.  The VHF antenna is a blade-type antenna with an omnidirectional radiation pattern. The purpose of the VHF antenna is to transmit and receive radio signals in the VHF frequency range.
　
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