Use of any of the DIRECT GPS-to-transponder position reporting methods
below require that the GPS that is connected to the SV-XPNDR-261 be
TSO’d when used in the US. Additionally, only specific models are supported
via these connections. Other counties may have different regulatory
requirements for GPS position indicators that are connected directly to the
SV-XPNDR-261’s direct serial input.
o AVIDYNE IFD540/IFD440: Must be connected directly to SV-XPNDR-261
pin 3, transmitting at 9600 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 (10m/s accuracy).
o FREEFLIGHT: FreeFlight 1201 or 1204 GPS, connected directly to SV-
XPNDR-261 pin 3, transmitting at 19200 baud. 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 (10m/s accuracy).
o GARMIN ADS-B/ADS-B+: Garmin GNS 400W/500W series (WAAS) or
Garmin GTN series, both with appropriate Software updates as designated
by Garmin, connected directly to SV-XPNDR-261 pin 3, transmitting at 9600
baud in “ADS-B+ OUT” or "ADS-B" format. "ADS-B" format only works with
SV-XPNDR-261 Software 2.02 and above. "ADS-B+" format requires SV-
XPNDR-261 version 2.06 or later. With 2.06 or later Software the format in
use will be auto-detected. The original Garmin ADS-B format is not
compliant for use after 2020, and may cause compliance failures in the
FAA's ADS-B monitoring system, but is acceptable to use until 2020. 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.
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