Transponder Operation
SkyView HDX Pilot’s User Guide – Revision B 7-13
a. SBY: The transponder is on, but will not reply to any interrogations. This is the
mode that the transponder is in when none of the modes below are active.
b. GND: The transponder will only reply to direct Mode S interrogations using the
specific ICAO address from surface movement radar. It will not reply to mode A,
C and Mode S all-call interrogations.
c. AUTO (replaces GND, above): Available when the transponder is configured to
automatically switch between ALT/GND (see the SkyView Classic / SE / HDX
System Installation Guide for details). When AUTO is selected, the transponder
will automatically switch between ALT and GND modes – reflected in the
transponder status in the top bar – using a combination of GPS and air data
changes. Defaults to ALT when there is no GPS fix.
d. ON: The transponder will respond to all interrogations, but altitude reporting is
suppressed.
e. ALT: The transponder will respond to all interrogations.
f. IDT: Displayed while the transponder is broadcasting an ident after the IDENT
button is pushed at ATC’s request.
g. Big red “X” (covering entire transponder status area): Indicates an `, either with
the transponder itself or in the communication between the transponder
module and SkyView. The transponder is not responding to interrogations. Check
the wiring and settings between the transponder module and SkyView if you are
authorized to maintain your aircraft. Contact Dynon Avionics Technical Support
for further assistance.
• Reply Status: The reply indicator illuminates when the transponder replies to
interrogations.
Note that there are some situations when the selected transponder mode may be
different from the status annunciated in the Transponder Status Area. For example,
if you select ALT mode, but there is a squat switch installed, it will keep the
transponder in GND mode until the aircraft has become airborne. The requested
ALT mode would then be activated.
When connected properly, third party transponders such as the Garmin GTX 330
and GTX 327 can provide status as described above. However, they cannot be
controlled from the SkyView display as the SV-XPNDR-261/262 can.
Transponder Control Page
All control of the transponder is performed using the TRANSPONDER control page, selected
either by touching the Transponder status area on the TOP BAR, or by selecting MENU (Button
6) on the Main Menu, then selecting the XPNDR icon. The following page will appear:
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