Dynon Avionics SkyView System Installation Guide - Manual (Page 240)

SV-XPNDR-261/262 Installation, Configuration, and Testing
11-20 SkyView System Installation Guide - Revision S

Verification of the reported altitude using a static tester.

Where installed, verification of correct squat switch ground/airborne indications. In an
aircraft with a squat switch, setting the Mode switch to ALT when the aircraft is on the
ground should leave the transponder in GND mode; when the aircraft becomes airborne,
the mode should switch automatically to ALT.

Interrogations to verify the receiver sensitivity. A Mode S transponder should have a
minimum triggering level (MTL) of between -77 dBm and -71 dBm. Failure to meet this
requirement usually indicates antenna or coaxial cable problems.

Interrogations to verify the transmitted power. A Class 1 installation should have no less
than 125 Watts at the antenna (and no more than 500 Watts). A Class 2 installation should
have no less than 71 Watts at the antenna (and no more than 500 Watts). Failure to meet
this requirement is also generally due to antenna or wiring issues.

Where installed, verification of the GPS position source and ADS-B outputs. Whenever a
valid position is received by the transponder and the transponder is in any mode other than
Standby, ADS-B Extended Squitters should be observed on the transponder test set.

Ensure all regulatory requirements are met. In the United States, the transponder must
be tested and inspected per FAR 91.413.
Transponder Software Updates
If a software update for the SV-XPNDR-261/262 is available, the transponder will continue to
operate with no degradation of performance or annunciation of the available update during
SkyView’s normal operation. However, the transponder setup menu under SETUP MENU >
TRANSPONDER SETUP will be highlighted in yellow to indicate that an optional update is
available.
SkyView Transponder Software Version (SW) 2.02 Update
The optional transponder software (SW) version 2.02 software update that was contained
within SkyView software v5.0 through v7.1 updated the ADS-B out capability of the transponder
so that it meets the latest TSO C166b. This TSO will be required by the FAA 2020 ADS-B Out
mandate and other regulatory agencies around the world.
The version 2.02 transponder update contained in SkyView software v5.0 through v7.1 also
enabled an AUTOMATIC option for the AUTO ALT/GND setting which allows the transponder to
automatically determine whether the aircraft is in flight or not by using a combination of GPS
and air data changes from SkyView.
Note that after the transponder version 2.02 transponder update, only the SV-XPNDR-261 is
capable of meeting the 2020 ADS-B Out mandate, because of power transmission requirements
that the FAA ADS-B rules imposes. In other words, the SV-XPNDR-262, even if it is updated to
this software, cannot be used for 2020 ADS-B Out compliance credit.