Antenna Couplers
The antenna couplers supply these to the transceivers:
Key interlock
Tune in progress
Received RF
RF fault
Coupler fault.
The antenna coupler opens the key interlock discrete to stop the
transceiver transmit mode. The coupler sends the tune in
progress discrete to request tuning power from the transceiver. -- Требует энергию для
The RF fault is sent to the transceiver when the coupler detects настройки
a fault external to the coupler.
The coupler sends the coupler
fault discrete to the transceiver when it detects an internal
failure.
Received RF from the antenna is sent to the transceiver
during receive mode.
The antenna couplers share one common HF antenna. During the transmit mode,
only one coupler has an electrical interface
with the antenna. The on-side coupler sends the off-side coupler
an inhibit discrete to prevent the off-side radio from transmitting.
The couplers supply transmitted RF to the
antenna.
They receive push-to-talk (PTT) from the REU to
enable the the coupler tune mode. -- Делать возможным
The HF transceiver supplies these to the antenna coupler:
Transmitted RF
RF carrier during tune mode
Rechannel pulse. -- Импульс перестройки
Modulated RF is sent to the antenna through the antenna
coupler to be transmitted. During tune mode, a low wattage RF
carrier signal is sent to the coupler to match impedance -- согласовать
between the transceiver and the antenna. The transceiver
sends the rechannel pulse to start the coupler home sequence -- последовательнось,
mode. очередность
Hf Antenna
The HF antenna receives an RF signal from the antenna coupler and transmits the RF signal to other airplane and ground HF communication systems. The antenna also receives incoming RF signals and sends the RF signals to the antenna coupler.
External Interfaces
The HF transceiver has an interface with these components from other airplane systems:
Remote electronics unit (REU)
Selective calling (SELCAL) decoder
Flight data acquisition unit
PSEU.
The remote electronics unit sends flight crew microphone (mic)
audio to the transceiver to be transmitted. It also sends a PTT to
start the transceivers transmit mode. The transceiver sends
side tone and received audio to the REU for the flight interphone
system.
The transceiver sends received audio to the SELCAL decoder.
The SELCAL decoder isolates the SELCAL code from voice
audio.
The flight data acquisition unit receives a PTT from the
transceiver for key event marking.
The PSEU tells the HF transceiver whether the airplane is on the
ground or in the air.
Tuning interfaces General
The HF communication system uses data buses to share tuning information between the radio communication panels (RCPs) and the communication transceivers.
Tuning Bus
Each RCP has one ARINC 429 output bus.
The RCPs send tuning data to the communication transceivers.
Any RCP can tune any transceiver.
Each RCP sends tuning data and status to the other radio communication panels. This keeps the tuning data synchronized and lets any RCP tune any transceiver.
The RCP keeps the tuning data in memory. Usually, the RCP uses the tuning data from its memory to send on the output bus.
The RCP connects the CROSSTALK 1 bus directly to the output -- перекрестный
bus. This occurs for these RCP conditions: -- происходить, случаться
RCP does not have power
RCP is OFF
RCP is failed.