Dynon Avionics SkyView System Installation Guide - Manual (Page 239)

SV-XPNDR-261/262 Installation, Configuration, and Testing
SkyView System Installation Guide – Revision S 11-19

AIRCRAFT CATEGORY: To assist ATC tracking of aircraft, an aircraft category can be
transmitted by Mode S transponders. Set as appropriate for your aircraft.

AIRCRAFT LENGTH and AIRCRAFT WIDTH: On the ground, ADS-B transmits encoded
aircraft size information which is used by ATC to identify taxiing routes and potential
conflicts. Using the aircraft length and width (wingspan), in your current distance/speed
units (meters or feet), the SV-XPNDR-26 will calculate the appropriate size code for
transmission.

MAXIMUM CRUISE SPEED: Mode S transponders can transmit their maximum airspeed
characteristics to aircraft equipped with TCAS. This information is used to help identify
threats and to plan avoiding action by the TCAS equipped aircraft. The airspeeds are
grouped in ranges. Set as appropriate for your aircraft.

TIS TRAFFIC: Enables the display of TIS traffic on the SkyView Map page when in an area
served by a TIS-enabled RADAR. Note that TIS is a Mode S uplink service that is provided by
some US approach RADARs. TIS coverage is limited to the coverage areas of those radars;
there is no TIS provision outside the USA. If another traffic device is connected to SkyView
and is set up correctly, its traffic information will trump the TIS traffic from the SV-XPNDR-
261/262, regardless of this setting.
Altitude Encoder Calibration
In most transponder systems, a calibration is normally carried out every 24 months, as part of
the altimeter checks on the aircraft. The maximum allowed difference between the primary
altimeter and the altitude encoder is 125 feet in ETSO C88a and TSO C88b. The primary
altimeter in SkyView and the altitude encoder are one and the same device. It is therefore
impossible for the encoder and the primary altimeter to exceed 125 feet of altitude difference.
They will always be exactly the same as each other, thereby meeting the TSO requirements.
Therefore, no altitude encoder calibration is possible or necessary.
At times it may be useful to know the altitude that is being reported to the transponder. Since
SkyView sends pressure altitude to the SV-XPNDR-261/262, setting BARO to 29.92 will display
the pressure altitude being transmitted to the transponder in the normal SkyView altitude
display on the right side of the PFD page.
However, note that there is a single point altitude adjustment, located in SETUP MENU >
HARDWARE CALIBRATION > ADAHRS CALIBRATION > ALTITUDE ADJUST that adjusts SkyView’s
barometric altimeter. This adjustment affects both the displayed altitude and the encoded
altitude that is sent to other devices.
Post Installation Checks
Post installation checks should be carried out in accordance with your certification
requirements. These checks should include:

Mode S interrogations to verify correct address programming.