SkyView System Installation Guide - Revision AA 11-1
11. SV-XPNDR-261/262 Installation and Configuration
Figure 126 – SV-XPNDR-261; SV-XPNDR-262 is Physically Identical
Dynon Avionics offers two transponders. The SV-XPNDR-262 is a Class 2 Mode-S transponder
with Extended Squitter that is limited to use below 15,000 feet and speeds up to 175 knots.
The SV-XPNDR-261 is a Class 1 transponder that can be used above those limitations.
For US aircraft, the FAA 2020 ADS-B Out mandate (14 CFR § / FAR 91.227) requires a Class 1
transponder for flight in Class B or Class C airspaces. Thus, generally, US aircraft should install
the SV-XPNDR-261.
Until January 1, 2020 (prior to implementation of the FAA 2020 ADS-B Out mandate), the SV-
XPNDR-262 is acceptable for use in US aircraft. After 2020, the SV-XPNDR-262 is acceptable for
use in US aircraft if there is no flight within Class B or Class C airspaces.
To answer a frequent question, because they are certified devices, the SV-XPNDR-262 cannot
be upgraded to an SV-XPNDR-261.
Throughout this manual, the term SV-XPNDR-261/262 is used for instructions that apply to
either unit (they are largely identical, except for the power output). The SV-XPNDR-261/262
transponder responds to both legacy Mode A and Mode C interrogations, as well as Mode S
interrogations, from both ground radar and airborne collision avoidance systems. In all cases,
the interrogations are received by the transponder on 1030 MHz, and replies are transmitted
on 1090 MHz.
The SV-XPNDR-261/262 are DO-181D compliant Mode S level 2els datalink transponders, with
support for ADS-B Extended Squitter, which also meets the relevant environmental
requirements of DO-160F/ED-14F. The SV-XPNDR-262 has a nominal power output of 125
Watts, and meets the power output requirements for Class 2. The SV-XPNDR-261 has a nominal
power output of 250 watts, and meets the power output requirements for Class 1. The ADS-B
function meets DO-260B class B0 for the SV-XPNDR-262 and class B1S for the SV-XPNDR-261.
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