DC voltages supplied by the power distribution group?
5, 12, +- 15 VDC
What does the ATU FTG simulate?
Complex rada signatures to test the ATU and monitors its response.
Capabilities provided by the CIU FTG during off-line testing of the CIU?
Reception, memory utilization, real time tag for received data, real time syncho between ACU - ESP, bus simulation.
ACU FTG function:
simulate operation of Avionics Control Unit and is used for the CIU as well.
ESP FTG provides real time scenario emitter descriptor inputs for which LRUs?
ATU JLA JLB CIU RTC AABCR-ESP
ABC FTG simulates what?
Signals and Data from JLA JLB and RTC in their normal envirnoments.
Three forms of wiring in the DAAE
Cabinet cabling, cabinet and assembly harnessing, backplane wire wrapping.
How are standard wire-run lists tabularized?
From terminal (source), To terminal (destination), AWG No. (wire size)
Purpose of signal family listing?
To determine all wires connected to a pin in the double entry wire listing.
Additional info added to the sigal-family list?
Name, Number and terminal
What does cable termination lists document:
How are Wire-Wrap programs documented
Documented as wire connection lists.
Wire-wrap programs are organized intro three lists. How are these lists further divided?
Into name directory, input data listing, family listing, double entry wire listing.
Signal name directory list provides:
A cross reference between the signal name and number.
Test Verbs used with DAAE
Setup, initiate, fetch, remove
ATLAS noun modifiers peculiar to RF DAAE?
Threat Scan, Freq enconding, Pattern Generator
Components that make up the LRU DC Power generation and switching of the RF module:
Controlled turn on power assy, DC power switching assy, 8 LRU DC PS.
Signals applied to the DC PS to make automatic adjustments to output voltage?
Local/Remote sense signals
Purpose to sense lines used by DC PS:
Monitor output voltages and feedback regulators
Local sensing vs Remote sensing:
Local: Samples DC output at the switching assy
Remote: Samples DC prior to sending to UUT
Type of power used to energize the RF Module LRU DC PS assy:
Two Phase 120/208 VAC, 50/60 HZ
SIM CCA used to control operation of DC PS assy:
Power sense switch, power switch driver
When is ITA interlock driver signal present
When ITA/STA is installed.
Types of frequency stimulus RF module provide:
CW, AM, PM, Biphase Mod, FM, PAM
Components that provide the stimuluts in the RF module:
Three RF Synthesizers
Components that provide stimuluts to LRU Indirectly:
Which RF module Syhnthesizer connected to unswitched AC power and why:
3A1A4. unswitched power maintains constant temperature for the crystal oscillator.
Output characteristics of the RF Synthesizers:
CW or modulated outputs. Freq range of 10 MHz to 18 GHz. Power range of -110 to 10dBm
RF Synthesizer that provides PM signal that MSC converts to biphase:
Source of the drive signals used to produce PM in the RF synthesizer:
STB (station trigger bus), 10 Mhz ref, STG from test station SIM
Drive signals that are used to produce AM FM in the RF synthesizers:
AFG or AC ref
Which synthesizer outputs pulse amplitude modulation and how is this signal produced?
3A1A4. when PM and AM drive signals are applied at the same time.
Functions performed by the MSC
Control operation of synthesizers, power meter, spec-an. Modulation drive signals, modulating and demodulating, routing signals to and from UUT.
Measurements by the MSC:
Freq, pulse width, time interval, VDC, pulse amplitude of demodulated signals
Signal characteristics measured by the MSC
Rise/fall time, pulse width, pulse repetition, freq, modulation, percent of modulation, deviation.
Power range that the RF module can measure:
-70 to 35 dbm
Types of measurements made by Specan.
Power from UUT, frequency, and visually waveforms
Three power sensors and their ranges:
8484A: -70 to -20 dbm
8481A: -20 to 10 dbm
8481H: 0 to 36 dbm
Frequency range of SPECAN:
100 hz to 22 Ghz
How is data encoded in a PM signal:
as PRF, pulse width, pulse Rise/Fall time.
Verify vs Measure commands.
perform same function but measure omits the evaluation field.
READ commands stored where:
into the System variable measurement
LRUS tested in the RF DAAE
Band 1-3 receiver
Band 4-8 RFS
TWR (Tail warning Function)
WFG (Waveform Generator)
Interfacing FTGs to the RF DAAE
What happens if overtemp conditions inside either Bay?
Sensors light up an indicator and shut down the power supplies if the overtemp condition persists.
What happens if low air flow is detected in DAAE cabinets?
Airflow switch activates alarm and indicator and shutdown PS
What is the function of the Thermistor in each of the cabinets:
Open the EMO loop, turning off the station if any cabinet exceeds 122 degrees F.
Describe WFG FTG:
Used to test the WFG LRU. Configured for each test under TMA FTG control by software and IATE and TMA FTG
Purpose of DIGITAL interface in the band 1-3 FTG
Senddata and control signals including the left and right antenna inputs to the UUT and receivestatus and pulse descriptor info during fault isolation and offline testing.
Purpose of RF interface in the band 1-3 FTG
Generate a series of pulses to the UUT. The pulses modulate RF carriers in the IATE and send the resultant RF signal to the FTG and the UUT.
Purpose of the RFS FTG:
Provide digital and RF interface with RFS bands 4-8 LRUs.
What are stimuli form the FRE FTG used for.
To simulate normal FRE operation. Video stimulus: sent to the UUT to elicit a pulse descriptor word. IFX pulses: sent to modulate RF stimuli. Digital stimulus: for status, switching, control and threshold requirements.
What does the UUT provide the TWR FTG and how is it used?
Under test it provides a sample of its COHO, STALO, and Synchro signals. The FTG processes the signals and generates a simulated radar return for injection into the TWR antenna inputs.
Purpose of the TAG:
Allows data and control signals to be sent between the REW IATE and RF DAAE during RF DAAE self test.