Version 16.10 AF-6600 AF-5000 Series Install Manual 108
• 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.
• AUTO ALT/GND SWITCH: Allows the transponder to automatically switch between Airborne and Ground
modes. Available options include:
NONE : Automatic switching disabled
SQUAT SWITCH LOW ON GND: Utilizes a physical squat switch connected the SV- 261 per the above
instructions. When this option is selected, the transponder will consider the aircraft to be on the ground
when this switch is low (electrically grounded).
SQUAT SWITCH LOW IN AIR: Utilizes a physical squat switch connected the SV- 261 per the above
instructions. When this option is selected, the transponder will consider the aircraft to in flight when this
switch is low (electrically grounded).
AUTOMATIC (AIR DATA): The transponder automatically determines whether the aircraft is in flight or not by
using a combination of GPS and air data changes from AF-5000.
• 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- 261 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 AF-5000 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 AF-5000 and is set up correctly, its traffic information will trump the TIS traffic
from the SV- 261, regardless of this setting.
• GPS DATA: Determines the source of GPS position updates for ADS-B Out:
Use of any of the DIRECT GPS-to-transponder position reporting methods below require that the GPS
that is connected to the transponder be TSO’d when used in the US. Additionally, only specific models
are supported via these connections. Other counties may have different regulatory requirements for
GPS position indicators that are connected directly to the SV- 261’s direct serial input.
• DIRECT (AVIATION): Generic GPS outputting Aviation format data, connected directly to SV- 261 pin 3,
transmitting at 9600 baud. As this data format does not contain all of the information that ADS-B position
inputs require, Trig does not recommend using this connection for any purposes. Using this setting causes the
transponder to transmit the following ADS-B performance parameters:
SIL: 0 (Unknown integrity)
NACp: 0 (Unknown position accuracy)
NIC: 0 (Unknown containment)
NACv: 1 (10m/s accuracy)
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