Transponder Operation
7-16 SkyView HDX Pilot’s User Guide – Revision B
SBY is annunciated in the transponder status area in the Top Bar, and the SBY button will have a
yellow bar at the top indicating the mode is select. However, the yellow color indicates the
transponder is not in an actively transmitting mode.
GND (Ground mode)
Press the GND button to set the transponder to Ground mode. In Ground mode, the
transponder will respond to Mode S ground interrogations from surface movement radar.
When active, the GND button will display a green bar at the top and GND is annunciated in the
transponder status area in the Top Bar.
AUTO (Optional Ground mode)
IF the AUTO ALT/GND option is selected in setting up the transponder, the GND button will be
relabeled to AUTO, indicating that the transponder will automatically switch between the GND
and ALT modes based on the aircraft’s state. The current transmitting mode will be accurately
labeled in the Top Bar transponder enunciation, but the button label will always be AUTO.
ON (On mode)
Press the ON button to set the transponder to the On mode, in which it will respond to all
interrogations, but with altitude reporting suppressed. When active, the ON button will display
a green bar at the top and ON is annunciated in the transponder status area in the Top Bar.
ALT (ALT mode)
Press the ALT button to set the transponder to ALT mode, in which it will respond to all
interrogations with altitude reporting. When active, the ALT button will display a green bar at
the top and ALT is annunciated in the transponder status area in the Top Bar.
Reported Pressure Altitude
At times it may be useful to know the altitude that is being reported to the transponder. Since
SkyView sends pressure altitude to the SV-XPNDR-261/262, setting BARO to 29.92 will display
the pressure altitude being transmitted to the transponder in the normal SkyView altitude
display on the PFD page.
ADS-B OUT Transmissions
If SkyView HDX has a valid GPS signal and a SV-XPNDR-261/262 module is installed and working,
it automatically provides ADS-B output at the appropriate integrity level for the GPS signal
being used.
ADS-B OUT transmissions that meet the 2020 FAA ADS-B equipment mandate require that a
compliant GPS be provided to a capable ADS-B device (such as the SV-XPNDR-261). For this
purpose, a dedicated serial input is provided on the SV-XPNDR-261/262 module that allows an
appropriate GPS receiver serial output to be connected directly to the SV-XPNDR-261/262.
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