Sandia Aerospace STX 165 User Guide - Manual (Page 5)

After the software versions are displayed, the STX 165 display will revert to the normal operating mode. The up-
per left portion of the display will show the current transmitter Mode. The upper right portion of the display will
show the last code that was selected prior to shut down, the Pressure Altitude (PALT) is displayed in the lower left
and Elapsed Flight Time (EFT) in the lower right of the display. The built-in encoder requires a warm up time
and the PALT value will show dashes until the proper internal temperature is reached.
The user can set the mode to come on in the ALT mode at start up or at a predetermined altitude differential after
takeoff. The same is true for the EFT display. See User Set Up for a discussion of these features.
3
Code Selection
To select a new squawk code you will use the Data/Select knob and pushbutton:
Press the Enter Pushbutton, the first digit in the squawk code will blink.
Rotate the smaller Data knob until the value of the codes first digit is displayed.
Rotate the larger Select knob clockwise to the stop and then release. The second digit of the squawk code will
be blinking, indicating that it can be changed.
Continue repeating the above steps until you have selected the desired squawk code and then Press the Enter
Pushbutton.
The new squawk code has been selected and is now being reported to ATC.
Note: The select knob is a spring load alternate action knob. It can be
turned both clockwise and counter clockwise and will then return to center.
Mode Selection
To select the Mode of Operation you will use the Mode Control knob.
Rotate the Mode Control knob to select one of three transmitter Modes.
SBY Standby. The STX 165 is on but not responding to ATC interrogations
ON The STX 165 is on and replying in Mode A (No Altitude Reporting)
ALT The STX 165 is on and replying in Mode C (Altitude Reporting)