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RF 2 Flashcards

1
Q

AMPLITUDE of intelligence

A

Determines AMOUNT of carrier frequency deviation

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2
Q

FREQUENCY of intelligence

A

Determines RATE of carrier deviation

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3
Q

AMOUNT of carrier deviation

A

How FAR the carrier moves in frequency

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4
Q

RATE of carrier deviation

A

How FAST carrier moves in frequency

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5
Q

SCA

A

Subsidiary Communication Authorization

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6
Q

FM Stereo with SCA Decoding - FDM broadcast

A
  • 0-15 kHz: BB L + R audio
  • 19 kHz: Pilot carrier
  • 23-37 + 39-53 kHz: L + R SBs
  • 38 kHz: AMDSB-SC
  • 57 kHz: Digital RBDS/RDS
  • 59.5-75.5 kHz: SCA signal
  • 67 kHz: SCA 1
  • 92 kHz: SCA 2
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7
Q

AGC

A

Auto Gain Control

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8
Q

Frequency Hopping

A

Carrier signal switches in a pseudo-random fashion

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9
Q

Frequency Chirp

A

Carrier signal steps at a linear rate, “sweeping” across the spectrum

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10
Q

Direct Sequence

A

Generates a sin X / X signal

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11
Q

MUX

A

Multiplexing

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12
Q

DMUX

A

De-multiplexing

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13
Q

TDM

A

1) Time Division Multiplexing

2) Separates the transmission into TIME SLOTS

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14
Q

CDM

A

1) Code Division Multiplexing
2) Data is broken down into GROUPS of digital BITS
3) Groups (packets) can take many routes to get to their destination and be reassembled

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15
Q

FDM

A

1) Frequency Division Multiplexing

2) Signals are separated from each other/the carrier by an amount equal to the signal’s frequency

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16
Q

SAP

A

Separate Audio Program

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17
Q

Inverse Square Law

A

Signal falls 6 dB for every distance doubled, from the transmitter

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18
Q

Obstacles’ effects on waves

A

1) Reflection
2) Refraction
3) Diffraction

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19
Q

DCA-30 (antenna)

A
  • 10 kHz - 2 GHz range
  • Active
  • Omnidirectional
  • E field (far field)
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20
Q

Omnidirectional Wide Band (OWB) -60 (tuna can - antenna)

A
  • 2-18 GHz range
  • Passive
  • Omnidirectional
  • E field (far field)
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21
Q

VWA-30 (whip - antenna)

A
  • VHF/UHF range; usable < 1 GHz
  • Passive
  • Omnidirectional
  • E field (far field)
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22
Q

Active Loop Receiver (ALR) -30B (antenna)

A
  • 9 kHz - 30 MHz range
  • Active
  • Bidirectional
  • E/H field (far/near field)
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23
Q

Magnetic Field Coil (MFC) -30N (antenna)

A
  • 30-300 MHz range
  • Passive
  • Bidirectional
  • H field (near field)
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24
Q

Log Periodic Antenna (LPA) 30S

A
  • 300 MHz - 1 GHz range
  • Passive
  • Unidirectional
  • E field (far field)
25
Log Periodic Antenna (LPA) 60
* 1-18 GHz range * Passive * Unidirectional * E field (far field)
26
Delta Configuration Transformer
1) No neutral wire; only ground 2) Phase to ground = 120 V 3) Phase to phase = 208 or 240 V
27
4-Wire Wye Configuration Transformer
1) Phase to phase = 208 V 2) Neutral to ground = 0 V 3) Phase to neutral = 120 V 4) Phase to ground = 120 V
28
3-Wire Wye Configuration Transformer
1) Phase to phase = 240 V 2) Neutral to ground = 0 V 3) Phase to neutral = 120 V 4) Phase to ground = 120 V
29
Branches on same phase
0 V
30
Branches on different phase
208 or 240 V
31
White wire
Neutral (CONUS)
32
Green or bare copper wire
Ground (CONUS)
33
Red, blue, black, or [sometimes] brown wire
Phase (CONUS)
34
4 steps in the analog to digital (AD) process
1) Filter 2) Sample 3) Quantize 4) Encode
35
OOK
On-off keying
36
PCM
Pulse Code Modulation
37
Nyquist Standard
Sampling frequency must be at least twice the highest frequency being sampled
38
If Nyquist Standard is not followed
Results in aliasing (false signal)
39
PAM
1) Pulse Amplitude Modulation 2) TIME change affects pulse AMPLITUDE 3) FREQUENCY change affects spectral line AMPLITUDE
40
PDM (or PWM)
1) Pulse Duration (or Width) Modulation 2) TIME change affects pulse WIDTH 3) FREQUENCY change affects D.O.
41
PPM
1) Pulse Position Modulation 2) TIME change affects pulse PERIOD 3) FREQUENCY change affects spectral line SPACING/PRF
42
PRF
1) Pulse Repetition Frequency | 2) Inverse of pulse period (PP)
43
D.O.
1) Drop-out spacing/point | 2) Inverse of pulse width (PW)
44
D.C.
1) Duty cycle 2) Inverse of spectral lines 3) PW / PP
45
FMCAB
``` Frequency Modulation (type) Content Amplitude Bandwidth ```
46
Pulse analysis
Measure from 50% amplitude/width
47
Links in digital communication
1) Synchronous or asynchronous | 2) Synchronous implies that the transmit and receive clocks are locked together
48
FSK
1) Frequency Shift Keying | 2) A form of data transmission in which the modulating wave shifts the output between 2 predetermined frequencies
49
PSK
1) Phase Shift Keying 2) A form of data transmission in which data causes the phase of the carrier to shift by a predefined amount 3) A constellation diagram is used to plot the phase changes
50
QAM
1) Quadrature Amplitude Modulation 2) Uses instantaneous amplitude and phase changes 3) QAM-16 = 4 bits, QAM-32 = 5 bits..., QAM-256 = 8 bits, etc.
51
AMDSB - IN
1) Time domain shows fc + fi orriented SBs 2) Frequency domain shows envelope: a) Intelligence signal = 1 / fi b) Carrier signal = 1 / fc
52
AMDSB - IF
1) Time domain shows fc + fi orriented SBs; centered at IF frequency 2) Frequency domain shows envelope: a) Intelligence signal = 1 / fi b) Carrier signal = 1 / fc (of IF)
53
AMDSB - Detected out
1) Time domain shows fi; carrier stripped away | 2) Frequency domain shows sine wave of 1 / fi
54
Narrow band FM
< 15 kHz
55
Wide band FM
> 15 kHz
56
Carrier deviation
How far the carrier moves from its carrier position
57
Resolution Bandwidth (RBW) too large
Excess noise
58
Pulsing audio from speakers
Zero span not on

Electronics (13 decks)

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