Honeywell International Inc. RTA-50D Manuale Utente
MAINTENANCE MANUAL
965-1696
C.
Purpose of Equipment (Subtask 23-20-59-870-002-A01)
(1)
The RTA-50D VDR system is an airborne VHF communications transceiver that provides voice
and data communication between on-board aircraft systems, other aircraft systems, and
ground-based systems. It can operate in analog DSB-AM analog voice mode, VHF ACARS
data modes (Mode A and Mode 0), and VDL Mode 2 data mode. It also provides future support
for VDL Mode 3 digital voice and data modes.
and data communication between on-board aircraft systems, other aircraft systems, and
ground-based systems. It can operate in analog DSB-AM analog voice mode, VHF ACARS
data modes (Mode A and Mode 0), and VDL Mode 2 data mode. It also provides future support
for VDL Mode 3 digital voice and data modes.
(2)
The RTA-50D VDR agrees with the standards and specifications for VHF radios that operate in
the 118 to 137-MHz band as follows:
the 118 to 137-MHz band as follows:
• ARINC 716-11 airborne VHF communications transceiver
• ARINC 750-4 airborne VHF data radio
• EUROCAE ED-23B minimum performance specification for airborne VHF communications
equipment operating in the frequency range 117,975 to 137,000 MHz
• EUROCAE ED-92A MOPS for airborne VDL Mode 2 transceiver operating in the frequency
range 118-136.975 MHz
• RTCA DO-186B MOPS for airborne radio communications equipment operating within the
radio frequency range 117.975 to 137.000 MHz
• RTCA DO-207 MOPS for devices that prevent blocked channels used in two-way radio
communications due to unintentional transmissions
• RTCA DO-281A MOPS for aircraft VDL Mode 2 transceiver physical, link and network layer.
(3)
The RTA-50D VDR operates as a voice transceiver that agrees with the voice mode defined
in ARINC Characteristic 716 when operated as a 716 voice radio. Microphone audio and
PTT audio are inputs and side-tone audio is output. The RF signal is double sideband AM.
Frequency and channel bandwidth selection is made through a low-speed ARINC 429 bus
input interface to an RTP.
in ARINC Characteristic 716 when operated as a 716 voice radio. Microphone audio and
PTT audio are inputs and side-tone audio is output. The RF signal is double sideband AM.
Frequency and channel bandwidth selection is made through a low-speed ARINC 429 bus
input interface to an RTP.
(4)
The RTA-50D VDR operates as a transceiver when used as a 716 data radio. In this mode, it
agrees with the external data modem interface defined in ARINC Characteristic 716. The data
modem audio input, data key-line input, and data modem audio output interface to an ACARS
MU. The ACARS data modem audio input and output are 2,400-bps MSK modulated signals.
The RF signal is a double sideband AM-MSK signal. Channel frequency selection is made
through a second low-speed ARINC 429 bus input interface to the ACARS MU.
agrees with the external data modem interface defined in ARINC Characteristic 716. The data
modem audio input, data key-line input, and data modem audio output interface to an ACARS
MU. The ACARS data modem audio input and output are 2,400-bps MSK modulated signals.
The RF signal is a double sideband AM-MSK signal. Channel frequency selection is made
through a second low-speed ARINC 429 bus input interface to the ACARS MU.
(5)
The data modem audio output can be wired to a SELCAL decoder when the radio is not wired
to support 716 data mode operation. In ARINC 750 Data Mode A, the RTA-50D VDR provides
2,400-bps MSK modem functionality within the radio with ARINC 429 digital data input/output
interfaces to a CMU as defined in ARINC Characteristic 750. The command and data transfer
protocol between the VDR and CMU uses the ARINC 429 Williamsburg BOP Version 1 or
Version 3. The RF signal is a double sideband AM-MSK signal. Channel frequency selection is
made through the ARINC 429 interface to the CMU.
to support 716 data mode operation. In ARINC 750 Data Mode A, the RTA-50D VDR provides
2,400-bps MSK modem functionality within the radio with ARINC 429 digital data input/output
interfaces to a CMU as defined in ARINC Characteristic 750. The command and data transfer
protocol between the VDR and CMU uses the ARINC 429 Williamsburg BOP Version 1 or
Version 3. The RF signal is a double sideband AM-MSK signal. Channel frequency selection is
made through the ARINC 429 interface to the CMU.
(6)
When operated in Mode 2, the VDR supplies Mode 2 functionality defined in ARINC
Characteristic 750 and a 31,500-bps D8PSK modem functional internal to the radio. The Mode
2 radio uses ARINC 429 digital data input/output interfaces to a CMU as specified in ARINC
Characteristic 750. The command and data transfer protocol between the VDR and CMU uses
the ARINC 429 Williamsburg BOP Version 3. The RF signal is a D8PSK-modulated RF carrier.
Channel frequency selection is made through the ARINC 429 interface to the CMU.
Characteristic 750 and a 31,500-bps D8PSK modem functional internal to the radio. The Mode
2 radio uses ARINC 429 digital data input/output interfaces to a CMU as specified in ARINC
Characteristic 750. The command and data transfer protocol between the VDR and CMU uses
the ARINC 429 Williamsburg BOP Version 3. The RF signal is a D8PSK-modulated RF carrier.
Channel frequency selection is made through the ARINC 429 interface to the CMU.
EFFECTIVITY
ALL
23-20-59
Page 6
1 Mar 2011
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