Sandia Aerospace STX 165 Installation Manual - Manual (Page 5)

Section 1 General Description
1.1 Introduction
This manual describes the installation of the SANDIA aerospace STX 165 and STX 165 Mode C transponders. It is
intended for use by FAA certifi ed repair stations to install the STX 165 and STX 165R transponders and includes both me-
chanical and electrical installation information. Calibration, system confi guration and checkout procedures are included.
The installer should ensure that all functions are operating according to their intended purpose in their particular installa-
tion.
1.2 STX 165 / STX 165R Product Description
The STX 165 is a self contained, panel mounted Mode A/C transponder with a built-in 35K foot altitude encoder. The
built-in encoder supplies altitude data to the STX 165 for altitude reporting (Mode C) and outputs the altitude data on an
RS 232 data bus for interface to other avionics systems that require altitude data. A SANDIA aerospace STP 78 OAT
probe, P/N 305561-91 can be installed as an option. When the STP 78 is installed, the STX 165 will display OAT (Out-
side Air Temperature), Density Altitude and Icing Alert.
The STX 165R is a Remote Mode A/C transponder that accepts attitude data from altitude encoders, such as the SANDIA
SAE 5-35, in either a Gilham Grey code or RS 232 format.
Both units rely to ATCRABS interrogations with one of 4096 possible ‘squawk’ codes.
1.3 Technical Characteristics
1.3.1 Physical Characteristics
1.3.1.1 STX 165 Panel Mount
1/2 3ATI Panel Cut Out
Behind Panel Dimensions 1.78”H x 3.5”W x 7.34”L (4.52cm x 8.89cm x 18.64cm)
Weight: 1.30 Lbs. (.59 kg)
1.3.1.2 STX 165R Remote Mount Unit
Dimensions: 3.5” H x 1.8”W x 6.9”L (8.89cm x 4.57cm x17.53cm)
Weight: 1.16 Lbs. (.526 kg)
1.3.2 Electrical Characteristics- STX 165 and STX 165R
Power Out: 200 Watts Nominal
Transmitter Freq: 1090 MHz
Receiver Freq: 1030 MHz
Receiver Sensitivity: -74dBm Nominal at 90% reply rate
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