SV-XPNDR-261 Transponder Installation and Configuration
12-18 SkyView HDX System Installation Manual - Revision E
NIC: Sent from GPS to transponder. Refer to GPS documentation.
NACv: 1 (10 m/s accuracy).
o TRIG ADS-B (TN70): Must be connected directly to SV-XPNDR-261 pin 3,
transmitting at 19200 baud. This device is only supported in SV-XPNDR-
261 version 2.06 or later. See SV-XPNDR-261 Software Updates below for
more information about updating the SV-XPNDR-261 Software. Using this
setting causes the SV-XPNDR-261 to transmit the following ADS-B
performance parameters:
▪ SDA: 2 (Level C integrity) SIL: 3 NACp: Sent from GPS to transponder.
Refer to GPS documentation.
NIC: Sent from GPS to transponder. Refer to GPS documentation.
NACv: 1 (10 m/s accuracy).
• PRESSURE ALTITUDE: Displays status of pressure altitude input for the SV-
XPNDR-261.
• 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 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 to function properly. The default code of 000000 is not a valid
code. If the code is left at 000000, the SV-XPNDR-261 will only work in SBY
mode. A caution message – XPNDR HEX CODE NOT SET will appear if a
SV-XPNDR-261 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
that will enable it to operate as a Mode A and/or Mode C transponder only.
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