FreeFlight ADS-B FDL-978 Series Installation Manual page 23

Figure 2. FDL-978-XVR Wi-Fi Transceiver Block Diagram (Typical)
The FDL-978 Series Transmitters and Transceivers (ADS-B Out and ADS-B
In/Out) are required to receive altitude data obtained from the same pressure
altitude source as the transponder.
The systems can also be installed with a single bottom UAT antenna in installations
where the Federal Aviation Administration (FAA) does not require antenna
diversity.
The installation drawing shown in Figure 3 identifies the main difference between the FDL-978-
XVR and FDL-978-RX installations. The receiver installation does not require any connections
to a transponder or transponder transmit control. GPS data and pressure altitude source data
are required for receivers as well as transceivers.
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ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev G
1-7