SV-XPNDR-261 Transponder Installation and Configuration
SkyView HDX System Installation Manual - Revision E 12-1
12 SV-XPNDR-261 Transponder Installation and
Configuration
Figure 73: SV-XPNDR-261
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.
Throughout this manual, the term SV-XPNDR-261 is used for instructions that apply to
either unit (they are largely identical, except for the power output). The SV-XPNDR-261
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 are DO-181D compliant Mode S level 2 els datalink transponders,
with support for ADS-B Extended Squitter, which also meets the relevant environmental
requirements of DO-160F/ED-14F. 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.
The SV-XPNDR-261 is certified to ETSO 2C112b and ETSO C166a, and to FAA TSO
C112c and C166b. See Appendix B: Specifications for more information.
The SV-XPNDR-261 is controlled using SkyView’s on-screen menu system. This allows
the SV-XPNDR-261 to be mounted separately from the instrument panel and thus
requires no panel space. SkyView also provides pressure altitude directly to the SV-
XPNDR-261, eliminating the need for a separate altitude encoder.
The SV-XPNDR-261 are “Software-based” – they have internal “Software” (software) that
is occasionally updated. Any Software updates for the SV-XPNDR-261 are included
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