Port Select Discrete
RCP 1 and 2 send the port select discretes to the transceivers.
Each transceiver has two tuning data input ports, port A and
port B. The transceiver uses the port select discrete to select
the input port. A grounded port select discrete causes the -- заземление
transceiver to use port A. An open port select discrete causes -- служить причиной
the transceiver to use port B.
Training Information Point
If RCP 1 fails, you can tune the HF 1 transceiver with RCP 2 or 3. RCP 1 port select discrete changes from ground to open, and RCP 2 sends tuning data to input port B. RCP 3 sends tuning data on CROSSTALK 2 bus which is connected to RCP 2. RCP 2 connects this tuning data to the output TUNE bus.
If RCP 2 fails, you can tune the HF 2 transceiver with RCP 1 or 3. RCP 2 port select discrete changes from ground to open, and RCP 1 sends tuning data to input port B. RCP 3 sends tuning data on CROSSTALK 1 bus which is connected to RCP 1. RCP 1 connects this tuning data directly to the output TUNE bus.
HF COMMUNICATION TRANSCEIVER
Purpose
The HF communication transceiver transmits and receives RF signals for voice communication.
Physical Description
The front panel has these components:
Three fault LEDs
A TEST push-button
A microphone jack
A headphone jack.
All electrical connections are through connectors at the causes -- служить причиной
the transceiver.
Power
The transceiver must have 115 volts, 400 Hz, 3 phase ac power to operate.
Transceiver RF output is 400 watts peak envelope power (PEP) -- огибающ.
in the single sideband (SSB) mode. It is 125 watts average in the -- средний
amplitude modulated (AM) mode. In the AM mode the
tranceiver transmits the amplitude modulation equivalent
(AME). AME is the carrier frequency plus the upper side band.
Indications
The LRU STATUS LED comes on red for a failure in the HF transceiver.
The KEY INTERLOCK LED comes on red when the transceiver—блокировка keys and there is a failure in the HF coupler. Transmission is not possible at this time.
The CONTROL FAIL LED comes on red if there is no input from the control panel or if the control panel input goes invalid.—не состоятельный, не логичн.
(for other ILF)
The COUPLER FAIL LED comes on red when there is a failure in the HF coupler. Transmission is not possible at this time.
The CONTROL INPUT FAIL LED comes on red if there is no input from the control panel or if the control panel input goes invalid.
The EXTERNAL INPUT LED comes on red if there is no input
from the control panel or if the control panel input goes invalid.
ILF 542
BITE
ILF 401, 404-409, 410, 412, 414-417, 422, 424-429, 451, 508, 509,
510, 517, 523, 525-527, 551
Push the SQL/LAMP TEST push button to stop the operation of
the squelch circuit and to hear background noise through the ----сх. ПШ. Шумы.
headphones. This test also grounds the RF sensitivity and --заземл.
makes the front panel LEDs come on.
Push the TEST push button to test the transceiver front panel LEDs and to start a self-test. Connect a headphone to the transceiver front panel microphone jack to hear two short tones, and after one second, one additional tone through the audio system.
HF ANTENNA COUPLER
Purpose
The HF antenna coupler matches the transceiver 50 ohm impedance output to the antenna impedance at the set frequency. This decreases the voltage standing wave ratio --уменьш. Коэф. (VSWR) to less than 1.3:1.
Physical Description
The coupler front panel has these components:
Electrical connector to transceiver
Coaxial connector to transceiver
Pressure nozzle. -- наконечник, впускное отверстие.
The rear panel has the antenna feedline connector. -- фидер к ант.
Operation
The coupler uses 115v ac to operate. It does not need special cooling.
The coupler tunes in the aeronautical frequency range of 2 to
29.999 MHz. Tuning occurs in 2 to 4 seconds, 7 seconds --происходить, случаться.
maximum.
Training Information Point
CAUTION: YOU MUST PREPARE EACH HF COUPLER FOR REMOVAL. IF YOU DO NOT PREPARE FOR THE REMOVAL, YOU CAN CAUSE DAMAGE TO THE INTERNAL PARTS OF THE HF ANTENNA COUPLER.
CAUTION: MOVE THE HF ANTENNA COUPLER CAREFULLY.
SET THE COMPONENT ON ITS BOTTOM. DO NOT SET THE COMPONENT ON ITS END (WITH THE HANDLE UP). INTERNAL PARTS ARE EASILY DAMAGED.
It is important to position the antenna coupler tuning elements to the home position before you move the coupler. This will prevent damage to the coupler internal parts.
HF ANTENNA
Purpose
The HF antenna radiates and receives the RF signal. --излучать
Physical Description
The HF antenna is a notch type antenna. It is a U-shaped -- U-образная желобок, паз. fiberglass material. The antenna is sealed within the leading --закреп., вмурована внутри. edge of the vertical stabilizer.
The antenna receives the feed line from the antenna coupler.
WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF SIX FEET AWAY FROM THE VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
