C3I (UHF3) Flashcards
ODS port 5
Sends Matt and mini dama tuning commands to the antenna combiner
ODS port 1
- Interfaces with DCMS and CARP
- Allows online control if the mini dama
- routes status reports between ODS, MATT, and antenna combiner
ODS PORT 9
Used for MATT download and TDIMF format MATT TRACKS.
Function of the SATCOM preamp/diplexers
XMIT: receives MINI DAMA signal from RF antenna switch and sends it to antenna.
RCV: receives incoming signal from antenna, amplifies it and send is to the antenna combiner.
Is the RF antenna switch used for SATCOM transmission or reception?
Transmission
The antenna combiner contains how many channels?
4 channels
A, B, C, D
Which antenna combiner channel is for MINI DAMA?
Channel A
Function of the antenna combiner.
RCV: simultaneously receives from all four antennas, combines the signal to create 5db SnR and determines best antenna for transmission
XMIT: routes antenna selection and transmission to RF antenna switch
Which card in the antenna combiner determines the best antenna by sampling reception signals or by receiving operator entered antenna selection commands from the ODS.
Digital Signal Processor
DSP
When the antenna combiner BIT is initiated the BIT indicator light does what?
Illuminates steady for 10 seconds then flashes for 10 seconds.
Antenna combiner “OP INIT” pushbutton.
When depressed initializes combiner for normal operations.
The antenna combiner thermal fault indicator illuminates yellow when…
Combiner power supply overheat condition occurs.
If the thermal override switch on the antenna combiner is not actuated within _______ of an overheat condition, the power supply with shut down.
60 seconds
What is a visual indication of a completed BIT of the antenna combiner?
The active antenna lights will cycle.
The antenna combiner switch on the TACCO power control panel applies/removes power to what?
Antenna combiner
Preamp/diplexers
Regarding the MINI DAMA this card allows for the encryption and decryption of TDMA/DAMA Orderwires.
KGV-11 TRANSEC card
The PA overtemp indicator on the MINI DAMA power amplifier is…
Not used
Function of the MINI DAMA Power Amplifier.
Amplifies transmission signals developed by the Modem R/T.
Output is 100 watts or 20dB
System Critical message
Indicates equipment failure.
How many systems critical messages can be stored at one time?
Eight
Mode critical message.
Normally indicates equipment configuration change.
What is the uplink frequency range?
292 - 318 MHz
What is the downlink frequency range?
243 - 270 MHz
What is TDMA
Time Division Multiple Access
-Method of multiplexing data streams to allow multiple users access to the same satellite channel.
What is DAMA?
Demand Assigned Multiple Access
- Uses TDMA to have multiple users on one channel
- Allows users to give the channel during periods of inactivity
- Authorized users are allowed satellite access on demand
At what temperature will the “HIGH TEMP” indicator on the MATT illuminate?
160*F
What is the difference between the MATT blocks?
The cryptographic cards used to decrypt incoming broadcasts.
What is the required SNR for reliable imagery transmission?
52 dB
What is the required SNR for reliable voice transmission?
47 dB
What does OASIS stand for?
Over the horizon Airborne Sensor Information System
Where is the UHF-3 cone of silence?
Extends 30 degrees on either side of the aircraft nose.
Caution associated with the antenna combiner
The thermal override switch should only be used in emergencies, continued use in overtemp condition will damage to the unit.
What two signals does MATT receive from the antenna combiner?
Channel B, and C/D summed
How long does a BIT halt the signal processing inside the ate combiner?
15 seconds
How long does initialization halt signal processing in the antenna combiner?
1 minute
General description of the Mini-DAMA system.
- SATCOM system that supports exchange of secure battle group coordination data, imagery, and voice.
- Works on TDMA or non-TDMA
- 25k and 5k
How many I/O ports does the Mini-DAMA MODEM have? What are they used for?
-8 ports
-4 I/O ports are accessible
-Three are configured:
Port 1. KG-84A #1(imagery)
Port 2. UHF-3 ANDVT(voice)
Port 3. KG-84A #2(OTCIXS)
Function of the KGV-11 TSEC
Encryption and decryption of TDMA order wires.
What is the difference between 5k and 25k?
- Both capable of transmitting data and voice
- 25k has more time slots, bandwidth, and user capability
MATT block 1 uses what type of cards for data decryption?
IBS-S: KGV-25
IBS-I: KGV-26
MATT block 2 uses what type of cards for data decryption?
IBS-S: KGV-113
IBS-I: KGV-26
MATT block 3 uses what type of cards for data decryption?
IBS-S: KGV-113
IBS-I: KGV-26A
How long does it take to download MATT software from the TDP?
10-15 minutes
If the TDP is not installed or the and/or the ethernet lines are terminated and not jumped what systems will be lost?
No online control of AIMS or ALR-95
Do both drives have to be loaded to operate the TDP?
No, the ODS will work without the IP drive.
GFCP
Performs interface between the DCMS, MATT, CARP, AND ODS.
CARP
Receives ISAR track data and GPS time and ownership updates.
What happens when the OP INIT push button on the combiner is pressed?
Initializes the combiner for normal operations
- internal calibration is done to compensate for various paths in side the combiner and stores results in the non volatile memory.
- status message is sent to the TDP.
