Garmin AT Inc. AT7000 Manual Do Utilizador
AT7000 Mode S Transponder
Introduction
Page 2
560-0405-00 Rev –
December 14, 2001
© 2001 by UPS Aviation Technologies Inc.
1.2.2
AT7000 Mode S Transponder
The AT7000 transponder is packaged in a 4-MCU (Modular Concept Unit) outlined as
defined in ARINC Characteristic 600-7. The basic mechanical chassis is constructed of
lightweight aluminum alloy sheet metal. The unit uses forced air cooling per ARINC 404
or 600. ARINC standard LRU restraints are used as means of holding the transponder in
the mounting rack or tray. The maximum weight of the transponder is 11.5 pounds (5.2
kilograms). The rear connector receptacle is a size 2-shell assembly with inserts and
contacts as defined in ARINC Characteristic 718-4/718A. The unit features a fixed car-
rying handle, self-test switch with discrete LED STATUS annunciators, and a LCD dis-
play for system setup and verification.
defined in ARINC Characteristic 600-7. The basic mechanical chassis is constructed of
lightweight aluminum alloy sheet metal. The unit uses forced air cooling per ARINC 404
or 600. ARINC standard LRU restraints are used as means of holding the transponder in
the mounting rack or tray. The maximum weight of the transponder is 11.5 pounds (5.2
kilograms). The rear connector receptacle is a size 2-shell assembly with inserts and
contacts as defined in ARINC Characteristic 718-4/718A. The unit features a fixed car-
rying handle, self-test switch with discrete LED STATUS annunciators, and a LCD dis-
play for system setup and verification.
1.2.3
Control Panel
The control panel for the Mode S System provides for mode control of the ATC Trans-
ponders. Communication with the Mode S Transponders is accomplished via an ARINC
429 bus as defined in ARINC Characteristic 718. Control panel functions includes a
4096-ident code selection and display, altitude source and mode control switch, and se-
lection between two onboard transponders. The control panel also input FID into the
transponder.
ponders. Communication with the Mode S Transponders is accomplished via an ARINC
429 bus as defined in ARINC Characteristic 718. Control panel functions includes a
4096-ident code selection and display, altitude source and mode control switch, and se-
lection between two onboard transponders. The control panel also input FID into the
transponder.
1.2.4
Antenna
When installing the transponder antennas, a TSO’d antenna should be selected. Two an-
tennas are required. Having two antennas (one on top of the aircraft and one on the bot-
tom) provides the best coverage for receiving interrogations from ground radar, planes
above, and below. L-Band type recommended antennas are P/N S65-5366-7L, manu-
factured by Sensor Systems and P/N DM N150-2, manufactured by DM Antenna Tech-
nologies.
tennas are required. Having two antennas (one on top of the aircraft and one on the bot-
tom) provides the best coverage for receiving interrogations from ground radar, planes
above, and below. L-Band type recommended antennas are P/N S65-5366-7L, manu-
factured by Sensor Systems and P/N DM N150-2, manufactured by DM Antenna Tech-
nologies.
1.2.5
Altitude Source
The transponder contains dual inputs for acceptable types of altitude sources. The pin
configuration selection specifies which of the two inputs are used for obtaining altitude
information. Altitude sources are ADC (429), Synchro, or Gillham. The input uses a
ground/open logic level, where a ‘ground’ logic level specifies altitude source #2, and an
‘open’ logic level specifies altitude source #1.
configuration selection specifies which of the two inputs are used for obtaining altitude
information. Altitude sources are ADC (429), Synchro, or Gillham. The input uses a
ground/open logic level, where a ‘ground’ logic level specifies altitude source #2, and an
‘open’ logic level specifies altitude source #1.
1.2.6
Data Link Processor
Four high speed ARINC 429 busses are provided for interfacing to a Mode S Airborne
Data Link Processor (ADLP). The Comm A/B input and Comm A/B output busses are
used for transferring messages to and from the ADLP.
Data Link Processor (ADLP). The Comm A/B input and Comm A/B output busses are
used for transferring messages to and from the ADLP.
1.2.7
TCAS
The AT7000 contains an interface that allows it to work with an onboard TCAS II sys-
tem. The interface consists of two ARINC 429 high speed data busses, an XT Coordina-
tion bus that is an output from the transponder to TCAS, and a TX Coordination bus that
is an output from TCAS to the transponder.
tem. The interface consists of two ARINC 429 high speed data busses, an XT Coordina-
tion bus that is an output from the transponder to TCAS, and a TX Coordination bus that
is an output from TCAS to the transponder.