STX 165 Display and Controls
The STX 165 uses a bright sunlight readable OLED display that automatically dims to adjust to ambient
light conditions. The can be times however when some pilots may have a hard time reading the display,
especially in bubble canopies when the STX 165’s display is pointed directly at the sun. In this case, the
pilot can press and hold the VFR pushbutton for three seconds and the code will be displayed in large
numbers. In this condition, the Mode will continue to be displayed and both the mode and code can be
changed. To exit this mode press and hold the VFR pushbutton for three seconds again.
The STX 165 display can be thought of as being divided into four quadrants.
Upper Left Hand Quadrant is the Mode in which the STX 165 is operating.
SBY: or standby the display is on and the unit fully functional, except it is not replying to transponder
interrogations.
ON:
The STX 165 is on and responding to interrogations but not send out the aircraft altitude infor-
mation also call Mode A
ALT:
The STX 165 is on and responding to transponder interrogation with altitude data, also called
Mode C.
Reply Light This is a bar that will blink at a 1 Hz rate whenever the STX 165 is replying to transponder
interrogation It is directly under the Mode.
Upper Right Hand Quadrant: This displays the transponder code currently being transmitted by the STX 165
Lower Left Hand Quadrant: This show the pressure altitude (PALT) being sensed by the built-in encoder and
transmitted by the STX 165. If the Sandia ST 78 OAT probe is installed the quadrant will also display
Density Altitude (DALT) and Outside Air Temperature (OAT)
Lower Right Hand Quadrant: This area shows the three timer functions, Elapsed Flight Time (EFT), Timer
Up, and Timer Down (Timer DN).
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Caution: Pressing and holding the VFR pushbutton for less than three seconds will
cause the VFR code to be displayed and become the active code.
