User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 3-1
This document contains proprietary information and such information may not be disclosed to others for any
purposes without written permission from SELEX Sistemi Integrati Inc.
3. STANDARDS AND TOLERANCES
3.1 Introduction
This section contains a list of equipment parameters, their standards, their tolerances, and references to associated
maintenance paragraphs and computer screen displays. Signal levels, signal bandpass and alarm threshold
requirements at inputs of the RSCS are defined.
3.2 Standards and Tolerances
See Table 4-1 for standards and tolerances using external test equipment for calibration.
Table 3-1 Standards and Tolerances
Tolerance/Limit
Parameter
Procedure
Reference
Standard
Initial Operating
RF Carrier Power Level 5.2.3
As established
by flight
inspection
98 to 102 % of
standard
90 to 110 % of
standard
Modulation Level 5.2.4 95 % 93 to 97 % 91 to 99 %
1) Frequency 5.3.1
a. Carrier 5.3.1
(1) Conventional
75.000 MHz
± 2250 Hz of
Standard
± 3750 Hz of
Standard
(2) Offset Frequency
Operation
75.004 MHz and
74.996 MHz
±1500 Hz of Standard Same as initial
b. Modulation Tones
(1) Outer marker 400 Hz 399 to 401 Hz 396 to 404 Hz
(2) Middle marker 1300 Hz 1297 to 1303 Hz 1287 to 1313 Hz
(3) Inner marker 3000 Hz 2992 to 3008 Hz 2970 to 3030 Hz
2) Antenna Systems
a. Reflected power level
(VSWR)
5.2.8
1.0:1 = 1.05:1 = 1.1:1
b. Insulation resistance 5.4.4 Infinity = 50 megohms = 20 megohms
c. DC Resistance
5.4.5
Baseline
Measurement
= Standard + 5O
3) Monitor Alarm Points 5.3.6
a. Carrier Power 60 % of normal = 50 % of normal Same as initial
b. Modulation
1. Low Modulation 85% = 80 % Same as initial
2. High Modulation 99% = 99% Same as initial
4)VSWR 5.2.8 2.5:1 = 3.0:1 Same as initial
Automatic Transfer and/or
Shutdown
5.2.6
15 seconds = 30 seconds = 30 seconds
5)Verification of Built-In Test
Equipment (BITE)
a. Power Measurement Error 5.3.2 0.0% = 5.0 % Same as initial
b. VSWR Measurement Error 5.3.4 2.0:1 1.8 to 2.2:1 Same as initial
c. Modulation Percent
Measurement Error
5.3.3
0.0% = 3.0 % Same as initial