STX 165 User Manual 3700 Osuna Road NE Suite 711 Albuquerque, NM 87109 www.sandia.
This document and the information contained herein is the proprietary data of SANDIA aerospace Corporation. No part of this document may be transmitted, reproduced or copied in any form or by any means without the prior written consent of SANDIA aerospace. Due to SANDIA aerospace’s continued product and quality improvement programs, information contained in this document is subject to change without prior notice. Copyright 2010 SANDIA aerospace Corporation, all rights reserved.
STX 165 Operation The STX 165 is a Mode C transponder capable of transmitting 4096 different codes in response to ground radar interrogations. All operations of the STX 165 are controlled through the front panel controls. The controls are as follows: Data Knob Enter Pushbutton Power/Mode Control VFR Pushbutton Photocell The Power/Mode Control Select Knob Ident Pushbutton The STX 165 will come on anytime power is applied to the rear connector.
The VFR Pushbutton is use to select the VFR Squawk code. Pressing it a second time will recall the previous code. The VFR pushbutton has an additional function. Pressing and holding it for three seconds will enlarge the squawk code display. When in this mode the functions on the bottom portion of the display screen will no longer be displayed. Pressing and holding the VFR Pushbutton for three seconds again will exit this mode.
After the software versions are displayed, the STX 165 display will revert to the normal operating mode. The upper 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.
Altitude/Temperature Displays Altitude and temperature information is displayed in the lower left display quadrant. The operator can cycle through the different information by turning the Select knob (the large right side knob). Pressure Altitude The STX 165 has a built-in TSO’d altitude encoder. The output of the encoder is pressure altitude and is displayed as PALT.
Counter Up The Counter Up (CNT UP) allows the pilot to time various auxiliary functions. It can be activated and reset at any time. To use the CNT Up function: 1. 2. 3. 3. 4. Rotate the Data Knob until CNT UP is displayed. It will initialize on 0:00 if has not been used since system start up. To start the CNT UP, press the Power/Mode control pushbutton. Press the Power/Mode control pushbutton again and the timer will discontinue counting, and hold the elapsed time.
User Configuration The STX 165 allows the user to select certain parameters to fit their preferences. It is recommended the user only change these configurations when on the ground. This will keep from interfering with pilot duties and ensure uninterrupted response to ATC radar interrogations. 1. 2. 3. To enter the User Set UP mode the STX 165 must be in the SBY (Standby) mode.
ICING ALERT If a SANDIA aerospace STP 78 OAT probe is installed with the STX 165 the unit will provide an icing alert. The icing alert is a snow flake that appears in the upper right corner of the display whenever a user preset temperature is reached. To set the Icing Alert temperature: 1. Rotate the Data knob to select the ICING ALERT page. 2. Press the Enter Pushbutton. The brackets will extinguish and the Temperature will blink 3.
MIN BRIGHTNESS Default VFR The STX 165’s digital display automatically adjusts to ambient light conditions. The minimum intensity to which the STX 165 will adjust is set by the user. To set the minimum intensity: 1. Rotate the Data knob to select the MIN BRIGHTNESS page. 2. Press the Enter Pushbutton. The brackets will extinguish indicating the Min Brightness can be adjusted. 3. Rotate the Data knob clockwise to increase the minimum brightness and counterclockwise to decrease the minimum brightness. 4.
