Weapons Electrical Flashcards
WEE
How is power measured?
Watts
How is frequency measured?
Hertz
What is voltage?
Unit of electrical potential. Voltage is the pressure which pushed positive electrons through the circuit.
What sort of voltage currents are there?
Alternating Current or Direct Current
What is a transformer?
A transformer has the ability to step up or step down the voltage of AC. The magnetic fields are manipulated to allow the voltage change.
Why can DC not be put through a transformer?
DC relies on only one magnetic field.
How many contacts can X/S band radars hold?
100 overlayed with AIS contacts
What is the range of X/S band?
0.25 - 40nm
How many ARPA consoles do we have?
2 Bridge and Ops Room
What is the radar op modes?
Presentation, motion and trail
What feeds the RF energy to the antennas of the radars?
Transceivers
What is the SRHCR?
Short-range Helicopter Control Radar
How does the SRHCR work?
The SRHCR uses the Doppler effect by analysing the returned microwaved signal off its desired target and comparing how the objects motion has altered the signal.
What band and type is the SRHCR?
S band doppler radar
What is the SRHCR range?
24nm
Where does the SRHCR feed for display?
Combat Management System
Where is the SRHCR located?
Aft Mast
How does the SRHCR get time stamp information from the interface?
NDDS feeds ships time and attitude data to the interface
What does IFF stand for and what does it do?
Identification Friend or Foe: Helps ships/ operators identify contacts
What is the range of the IFF?
250nm
IFF has a transponder which can respond to interrogations in Mode 5. Describe mode 5?
Mode 5 uses an encrypted code which identifies friendly military units from other contacts.
IFF: Do the interrogator and transponder work independently of each other?
Yes
Describe the interrogator of IFF? What code allows altitude to also be measured?
The IFF interrogator measures the Angle and range of the contact to create a 2 dimensional position. If Mode C is in use a 3D position may be obtained by measuring the altitude.
IFF: Describe Mode 1?
Status of military contact being challenged