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DC voltages supplied by the power distribution group?
5, 12, +- 15 VDC
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What does the ATU FTG simulate?
Complex rada signatures to test the ATU and monitors its response.
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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.
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ACU FTG function:
simulate operation of Avionics Control Unit and is used for the CIU as well.
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ESP FTG provides real time scenario emitter descriptor inputs for which LRUs?
ATU JLA JLB CIU RTC AABCR-ESP
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ABC FTG simulates what?
Signals and Data from JLA JLB and RTC in their normal envirnoments.
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Three forms of wiring in the DAAE
Cabinet cabling, cabinet and assembly harnessing, backplane wire wrapping.
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How are standard wire-run lists tabularized?
From terminal (source), To terminal (destination), AWG No. (wire size)
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Purpose of signal family listing?
To determine all wires connected to a pin in the double entry wire listing.
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Additional info added to the sigal-family list?
Name, Number and terminal
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What does cable termination lists document:
Cabinet Cabling
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How are Wire-Wrap programs documented
Documented as wire connection lists.
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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.
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Signal name directory list provides:
A cross reference between the signal name and number.
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Test Verbs used with DAAE
Setup, initiate, fetch, remove
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ATLAS noun modifiers peculiar to RF DAAE?
Threat Scan, Freq enconding, Pattern Generator
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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.
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Signals applied to the DC PS to make automatic adjustments to output voltage?
Local/Remote sense signals
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Purpose to sense lines used by DC PS:
Monitor output voltages and feedback regulators
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Local sensing vs Remote sensing:
- Local: Samples DC output at the switching assy
- Remote: Samples DC prior to sending to UUT
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Type of power used to energize the RF Module LRU DC PS assy:
Two Phase 120/208 VAC, 50/60 HZ
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SIM CCA used to control operation of DC PS assy:
Power sense switch, power switch driver
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When is ITA interlock driver signal present
When ITA/STA is installed.
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Types of frequency stimulus RF module provide:
CW, AM, PM, Biphase Mod, FM, PAM
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Components that provide the stimuluts in the RF module:
Three RF Synthesizers
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Components that provide stimuluts to LRU Indirectly:
MSC, PNA
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Which RF module Syhnthesizer connected to unswitched AC power and why:
3A1A4. unswitched power maintains constant temperature for the crystal oscillator.
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Output characteristics of the RF Synthesizers:
CW or modulated outputs. Freq range of 10 MHz to 18 GHz. Power range of -110 to 10dBm
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RF Synthesizer that provides PM signal that MSC converts to biphase:
3A1A2
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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
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Drive signals that are used to produce AM FM in the RF synthesizers:
AFG or AC ref
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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.
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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.
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Measurements by the MSC:
Freq, pulse width, time interval, VDC, pulse amplitude of demodulated signals
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Signal characteristics measured by the MSC
Rise/fall time, pulse width, pulse repetition, freq, modulation, percent of modulation, deviation.
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Power range that the RF module can measure:
-70 to 35 dbm
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Types of measurements made by Specan.
Power from UUT, frequency, and visually waveforms
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Three power sensors and their ranges:
- 8484A: -70 to -20 dbm
- 8481A: -20 to 10 dbm
- 8481H: 0 to 36 dbm
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Frequency range of SPECAN:
100 hz to 22 Ghz
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How is data encoded in a PM signal:
as PRF, pulse width, pulse Rise/Fall time.
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Verify vs Measure commands.
perform same function but measure omits the evaluation field.
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READ commands stored where:
into the System variable measurement
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LRUS tested in the RF DAAE
- Encoder
- Band 1-3 receiver
- Band 4-8 RFS
- TWR (Tail warning Function)
- WFG (Waveform Generator)
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ICA purpose:
Interfacing FTGs to the RF DAAE
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What happens if overtemp conditions inside either Bay?
Sensors light up an indicator and shut down the power supplies if the overtemp condition persists.
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What happens if low air flow is detected in DAAE cabinets?
Airflow switch activates alarm and indicator and shutdown PS
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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.
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Describe WFG FTG:
Used to test the WFG LRU. Configured for each test under TMA FTG control by software and IATE and TMA FTG
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Purpose of DIGITAL interface in the band 1-3 FTG
Send data and control signals including the left and right antenna inputs to the UUT and receive status and pulse descriptor info during fault isolation and offline testing.
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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.
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Purpose of the RFS FTG:
Provide digital and RF interface with RFS bands 4-8 LRUs.
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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.
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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.
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Purpose of the TAG:
Allows data and control signals to be sent between the REW IATE and RF DAAE during RF DAAE self test.
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