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______________________________
 (1)  
The left and right (if installed) HF communication control panels (referred to as the control panels) are located on their respective side of the pilots' overhead panel P5. The control panels weigh approximately 2.2 pounds and are self-contained, including power supply. Each control panel is dedicated to providing mode control, frequency selection, and radio frequency (RF) sensitivity adjustment for its respective HF communication transceiver.

 (2)  
The front panel of the control panel contains a mode control switch, two sets of frequency selector knobs, a frequency display, and an RF SENS (sensitivity) control. The mode control switch sets the HF system to OFF, or selects either the AM (amplitude modulated) or USB (upper side band) mode of operation. The left frequency selector knobs select the MHz and 100 kHz digits on the frequency display. The right frequency selector knobs select the 10 kHz and 1.0 kHz digits on the frequency display. The RF SENS control adjusts the signal sensitivity of the receiver circuits in the HF comm transceiver.

 (3)  
The control panel contains circuits inside which convert the mode and frequency selections into digital form. The control panel provides a 32-bit word to the HF comm transceiver in ARINC-429 format.

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MAINTENANCE MANUAL

RIGHT HF P11 PANEL COMMUNICATION

SELECTOR CONTROL SELECTOR MODE CONTROL FREQUENCY
(SENSITIVITY)
KNOBS SWITCH KNOBS
SWITCH
SELECTOR KNOBS
CONTROL
HF COMMUNICATION CONTROL PANEL HF COMMUNICATION CONTROL PANEL

GUN 001-050,052-999 GUN 051
HF Communication System - Component Location
Figure 1 (Sheet 1)

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MAINTENANCE MANUAL

MAIN EQUIPMENT CENTER  AFT EQUIPMENT CENTER

HFS-700  LRU FAIL KEY INTERLOCK CONTROL INPUT FAIL PHONE MIC COLLINS SQL/LAMP TEST 

HF COMMUNICATION TRANSCEIVER

HF Communication System - Component Location
Figure 1 (Sheet 2)

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COUPLER BAY HF COMM ANTENNA SEE E  ACCESS COVER  AUX SPAR (REF) MATERIAL INSULATIVE 
FRONT SPAR (REF) 
FEEDLINE CONNECTION
ANTENNA 
F ANTENNA COUPLER LEFT HF COMM SEE 
ACCESS OPENING (322CL) 
F ANTENNA COUPLER RIGHT HF COMM SEE  (REF) CRAWL SPACE 
HF COMM ANTENNA COUPLER BAY E 

TEST CONNECTOR
J3 
TRANSCEIVER  J1 
RF CONNECTOR  INTERCONNECT 
CONNECTOR 
J2 
PNEUMATIC VALVE 

HF COMM ANTENNA COUPLER
F
HF Communication System - Component Location
Figure 1 (Sheet 3)

D08900
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 B. HF Communication Transceiver
____________________________
 (1)  
The left and right (if installed) HF communication transceivers (referred to as the transceivers) are located in the aft equipment center or in the main equipment center. The transceivers are 6 MCU rack mounted units weighing approximately 26.5 pounds. Each transceiver contains an internal blower motor.
　
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