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90 Cards in this Set
- Front
- Back
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Meansurement of antenna efficiency |
Power gain |
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Antenna efficiency |
The amount of power it can take in and transmit out into the environment |
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Types of loss associated with transmission lines |
Resistive, capacitive, inductive |
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FTC |
Doesn't have effect on receiver gain. Fast time constant. |
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STC |
Single transmission correction |
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Synchronizer determines |
Timing of a radar |
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IF used in radar |
30-60MHz |
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Most common receiver used in radar systems |
Superheterodyne because it's extremely sensitive and has good stability |
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Greatest limiting factor of receivers max range |
Noise |
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Downfall of CW |
Not affective against stationary targets |
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2 types of energy transmitted from radar |
Pulse and continuous wave (CW) |
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Primary factor affecting radar |
Resolution |
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RF frequency band |
88-108MHz allows for 100 channels spaces 200kHz apart with a frequency range of 50-15kHz |
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Orange peel parabolic antenna |
Produces a beam that's wide in vertical and narrow in horizontal |
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"A" dimension |
Width and contains conductors. Determines frequency range. |
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"B" dimension |
Determines power handling capability of waveguide |
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Dummy Load |
Resistive load that's absorbs all energy from the transmitter so it doesn't leave the antenna |
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2 types of ECM |
Active ECM- Jamming Passive ECM- Chaff Denial, Deception |
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Limiters primary function |
Provide a constant output above a certain voltage value |
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Advantages of superheterodyne |
Extremely sensitive and good stability |
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Advantages of superheterodyne |
Extremely sensitive and good stability |
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3 methods of SSB generation |
Filter method, Phase method, Third method (Weaver method) |
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Advantages of superheterodyne |
Extremely sensitive and good stability |
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3 methods of SSB generation |
Filter method, Phase method, Third method (Weaver method) |
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NBFM frequency range |
10kHz-30kHz |
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Control signal |
Regulates movement of data, processing of data at inputs and outputs |
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Control signal |
Regulates movement of data, processing of data at inputs and outputs |
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FM receiver IF |
10.7MHz |
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Balanced modulator purpose |
Eliminate or suppress carrier |
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A typical comm system must have |
Transmitter, Receiver, Modulator |
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In CB transceiver audio detection is performed by the... |
Diode |
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In CB transceiver audio detection is performed by the... |
Diode |
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Ideal SWR |
1:1 ratio |
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Advantage of SSB |
Only uses 1 sideband |
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AM receiver uses and RF amp |
False |
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HF frequency range |
3MHz-30MHz |
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HF frequency range |
3MHz-30MHz |
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Human ear |
16Hz-16kHz |
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Noise |
Any disruption or variation that contaminates the modulated signal |
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PLL system consists of |
Phase detector,frequency counter/ divider, VCO, loop filter |
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Data bus |
Carries data between the main sections of the system |
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Data bus |
Carries data between the main sections of the system |
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Static ram |
Flip flops, Expensive |
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L1 Cache |
Internal to processor |
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L1 Cache |
Internal to processor |
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L2 cache |
External to processor |
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L1 Cache |
Internal to processor |
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L2 cache |
External to processor |
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Flag |
A bit of the status register that represents a specific condition |
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SSB transmission are____ modulated |
AM |
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SSB transmission are____ modulated |
AM |
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Control signal |
4 separate signals 90 degrees apart |
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Purpose of mixer |
Mix tuned RF with VCO reference frequency |
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Phase detector job |
Compare fv with fr |
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For squelch to operate what must be disabled |
Audio amp |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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Antennas ability to couple/ radiate energy |
Efficiency |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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Antennas ability to couple/ radiate energy |
Efficiency |
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What type of antenna is used in microwave system |
Horn |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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Antennas ability to couple/ radiate energy |
Efficiency |
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What type of antenna is used in microwave system |
Horn |
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Dump trap |
Stops accumulated water and sludge from entering system |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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Antennas ability to couple/ radiate energy |
Efficiency |
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What type of antenna is used in microwave system |
Horn |
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Dump trap |
Stops accumulated water and sludge from entering system |
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Sensitivity |
Ability to lock onto weak signal |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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Antennas ability to couple/ radiate energy |
Efficiency |
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What type of antenna is used in microwave system |
Horn |
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Dump trap |
Stops accumulated water and sludge from entering system |
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Sensitivity |
Ability to lock onto weak signal |
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Highest layer in ionosphere |
F Layer |
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For squelch to operate what must be disabled |
Audio amp |
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Why is a dummy load necessary |
For testing purposes |
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Antennas ability to couple/ radiate energy |
Efficiency |
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What type of antenna is used in microwave system |
Horn |
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Dump trap |
Stops accumulated water and sludge from entering system |
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Sensitivity |
Ability to lock onto weak signal |
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Highest layer in ionosphere |
F Layer |
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Rule of thumb for HF |
Higher the sun higher the frequency |
