SV-XPNDR-26X Installation, Configuration, and Testing
11-14 SkyView System Installation Guide - Revision K
VFR CODE: When the pilot presses the VFR button, a pre-programmed code will replace
the current squawk code. The pre-programmed code is set up here; the choice of code
will depend on the normal location of the aircraft. In the USA, the VFR squawk code is
1200. In most parts of Europe, the VFR squawk code should be set to 7000.
SQUAT SWITCH: The Squat switch input allows the transponder to automatically switch
between Airborne and Ground modes. Set as appropriate if you have connected a
physical squat switch to the SV-XPNDR-26X per the above instructions.
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: Your aircraft’s length in your current distance/speed units (meters or
feet)
AIRCRAFT WIDTH: Your aircraft’s width in your current distance/speed units (meters or
feet)
TRANSMIT TEST SQUITTERS: Because of limitations in the ATC radar computer systems,
in US airspace the FAA require ADS-B equipped aircraft to periodically transmit their
Mode A squawk code in an ADS-B squitter message. This allows the computer system to
reconcile conventional radar traces with ADS-B information in a mixed surveillance
environment. Because the Mode A code does not form part of the base ADS-B message
set, the code is sent in a “TEST” message.
Because different regulatory authorities have not agreed on the behavior of the TEST
message, the installer must select the local preferred behavior. For aircraft registered in
the USA, the TEST message should always be transmitted. For other airworthiness
approval authorities, the preferred behavior is to apply a geographical filter so that
these messages are only sent when the aircraft is visible to US radar systems. Because it
has a GPS position input, the transponder already knows the geographic position of the
aircraft, and therefore in this case, the recommended option setting for these messages
is “Only in America”.
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-26X, regardless of this setting.
GPS DATA: Future software updates will allow the SV-XPNDR-26X to receive data
directly from a GPS that is capable of meeting the FAA’s 2020 ADS-B Out requirements.
Since the SV-XPNDR-26X will need an update to support TSO C166b, this setting should
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