SV-XPNDR-261/262 Installation and Configuration
SkyView System Installation Guide - Revision AA 11-21
NACp: Sent from GPS to transponder. Refer to GPS documentation.
NIC: Sent from GPS to transponder. Refer to GPS documentation.
NACv: 1 (10m/s accuracy)
PRESSURE ALTITUDE: Displays status of pressure altitude input for the SV-XPNDR-
261/262
TAIL NUMBER (SEE AIRCRAFT INFO): Displays tail number (set in SYSTEM SETUP >
AIRCRAFT INFORMATION)
TRANSPONDER HEX CODE: A Mode-S transponder’s HEX code is more precisely called a
24-bit ICAO code. All aircraft that fly with a Mode S transponder must have the correct
ICAO code that is assigned to the specific aircraft, configured in the aircraft’s Mode-S
transponder. The ICAO / HEX code uniquely identifies the aircraft and the country in
which it is licensed. All ICAO / HEX codes are assigned by the aircraft licensing authority
in the country in which the aircraft is registered/licensed.
The SV-XPNDR-261/262 setup requires the hexadecimal number (base 16) format;
SkyView cannot accept the Octal (base 8) or Decimal (base 10) format.
For US registered aircraft with a conventional (pattern) N-number, when the tail
number is entered, the HEX CODE will be set automatically (computed based on
the aircraft N-number). If the TRANSPONDER HEX CODE cannot be computed, the
TRANSPONDER HEX CODE remains set to 000000.
The HEX CODE needs to be set to the aircraft’s assigned code for the SV-XPNDR-
261/262 to function properly. The default code of 000000 is not a valid code. If the
code is left at 000000, the SV-XPNDR-261/262 will only work in SBY mode. A
caution message – XPNDR HEX CODE NOT SET will appear if a SV-XPNDR-261/262
is configured in SkyView, but the HEX CODE is not set to a valid number.
There is no “special” HEX CODE that can be input to the SV-XPNDR-261/262 that
will enable it to operate as a Mode A and/or Mode C transponder only.
o For US aircraft can be found at the FAA aircraft registry at
http://registry.faa.gov/aircraftinquiry/nnum_inquiry.aspx. The FAA aircraft
register shows both the octal number and the hexadecimal value.
o The website http://www.airframes.org provides HEX CODEs for most countries’
aircraft that can be input into SkyView. The HEX CODE is the value shown in the
ICA024 result field.
o If you only have the octal number, you must convert it to hexadecimal. There is
an Octal to Hexadecimal converter tool available in the Support section of
http://www.trig-avionics.com/.
VFR CODE: When the pilot presses the VFR button, a pre-programmed code will
replace the current squawk code. The pre-programmed code is set here; the choice
of code will depend on the normal location of the aircraft.
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