ADS-B; A GUIDE TO CONNECTING GPS-DEVICES, ADS-B RECEIVERS, MODE-S TRANSPONDERS AND DISPLAYS...page 3

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RECEIVING DATA...ADS-B IN

Receiving position data of other air traffic provided on the signals broadcasted by mode-S transponders requires the use of a so-called ADS-B receiver. This receiver consists of a 1090MHz-antenna to be installed in an unobstructed location, a receiver module to proces the received data and convert the data into NMEA sentences and at least one customizable output port for connecting external displays or computers. In some cases the ADS-B receiver is combined with an integrated traffic display, Flarm and/or GPS.

Garrecht TRX-1090 ADS-B receiverTRX-1090

The TRX-1090 was developed to combine Flarm traffic information from an external source with the mode-S traffic information as received by the TRX-1090. This traffic information can subsequently be displayed on an external display (LX9000, Oudie a.o.). Alerting for both types of traffic detection is available in practically the same way, however different symbols may be provided depending on the type of display or software used. The TRX-1090 can also provide the GPS information required for the ADS-B OUT via a transponder (see chapter GPS-sources). The unit features only one antenna: ADS-B.

The diagram below (pic 1) indicates which ports are recommended for connecting various instruments. If required, these ports can be re-programmed using a PC.

TRX-1090 schematic
pic 1

ADS-B OUT, 12 volt power and GND are usually provided on port 1. This port has an IGC-standard pin-definition as shown in pic 2. The baudrate can be programmed by means of the TRX-Tool to match the required baudrate of the connected transponder. For port 1, pin 6 (TX) will have to be connected to the RS232 input (RX) on the transponder to allow ADS-B output. A Flarm-device as input source should be connected to port 4. Ports 2 and 3 can be used to connect various types of displays. All ports should be configured using TRX-tool.

TRX-1090 port 1 and 4
pic 2

Garrecht TRX-2000 Traffic monitorTRX-2000

This system is an extension of the TRX-1090 ADS-B receiver previously discussed. The system has been fitted with a graphical representation of the received traffic information and requires a 57mm hole in the instrument panel. Connecting and configuring the TRX-2000 is identical to the TRX-1090. Optionally a Flarm can be integrated in the TRX-2000. The system provides connection of all required antennas (GPS, ADS-B and Flarm (if installed)).

Garrecht TRX-1000 ADS-B receiver

TRX-1000 is a compact, lightweight, low-power and rugged ADS-B receiver. Range however is limited, the ports are non-configurable and connection of an external GPS-source is required (either on RX1 or RX2). The TRX-1000 features one central power/data connector (D-SUB 9)(pic 3) and a standard SMA antenna (ADS-B). Various connection cables and signal splitters are available.TRX-1000

TRX-1000
pic 3

PowerFlarm Core

The PowerFlarm Core units combine Flarm and ADS-B reception in one device. The unit combines the data from the internal Flarm transceiver and ADS-B receiver and converts that data into standard NMEA-sentences which can be used by external displays or
navigation computers to display traffic and generate alerts or warnings.PowerFlarm Core The unit has two programmable ports which can be used to output these data. It can also be used as the GPS-source for position data to a mode S transponder with ADS-B out capability. Four antenna connections are provided: GPS, ADS-B and Flarm (2x).

There is no standard, but because the RJ45 socket is defined according IGC specifications (pic 4) we recommend to use this port to connect your flightcomputer and/or Flarm display (a splitter or splitting unit may be needed).

PowerFlarm RJ45
pic 4

The D-SUB9 connector pins of the PowerFlarm Core are specified as follows (pic 4):

PowerFlarm D-SUB9
pic 4

Configuring the ports of PowerFlarm requires a configuration file to be installed on a USB-stick. Insert the USB-stick in the PowerFlarm and switch on the PowerFlarm. The unit will immediately start configuring itself. Please refer to the manual for the information given by the LED status light. The configuration file must be generated via the online PowerFlarm Core Configurator (pic 6). If the particular port provides GPS-data for ADS-B OUT via a mode S transponder select GPS Data Only, for simple Flarm displays use Traffic Data Only and for advanced Flarm displays and navigation computers use GPS And Traffic Data (the example below shows our settings using a LX9070 navigation computer and a FlarmLED display on the RJ45-port and a Garrecht VT01 mode S transponder on the D-SUB9-port).

PowerFlarm Core Configurator
pic 6

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