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Electronics > RF 3 > Flashcards

RF 3 Flashcards

1
Q

Lower RBW

A
  • Lower noise floor

- Higher sensitivity

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2
Q

Aspects of Digital

A
  • Square signal

- Can’t be demodulated

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3
Q

Most common impedance

A

50Ω

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4
Q

Most directional antena

A

Horn

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5
Q

Does a carrier current require 60 Hz?

A

No

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6
Q

If I talk louder in FM

A

Signal gets wider

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7
Q

If I talk louder in AM

A

Signal gets taller

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8
Q

Up-converters overcome

A

Equipment weakness and lower frequencies

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9
Q

Up-converters compensate for

A

Receiver sensitivity and frequency response near DC

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10
Q

Medium/channel is targeted

A

Because it is the least controlled

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11
Q

Impedance (defined by capacitance and inductance) considerations

A
  • diameter of conductors
  • distance between conductors
  • dielectric between conductors
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12
Q

Transition point from Near to Far Field

A

5 wavelengths (λ)

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13
Q

Inverse Square Law

A

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

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14
Q

Physical barriers’ effect on sound propagation

A

1) Reflection
2) Refraction
3) Diffraction

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15
Q

Modulation

A

1) The Process of putting information onto a high frequency carrier for transmission
2) In order to be used by the receiving person it must be DEMODULATED (stripping away the carrier)

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16
Q

14-sided box

A
  • 6 interior
  • 6 exterior
  • everything inside
  • everything outside
17
Q

30 dBm

A

1 W

18
Q

How do cell devices talk to the base station?

A
  • Frequency division duplexing (FDD)

- Time division duplexing (TDD)

19
Q

Cellular generations

A
  • 1G: AMPS
  • 2G: GSM/CDMA one
  • 3G: UMTS - CDMA2000; 3GPP
  • 4G: LTE
  • 5G: NR
20
Q

AMPS

A
  • 30 kHz

- voice

21
Q

GSM

A
  • 200 kHz

- voice

22
Q

CDMA

A
  • 1.25 MHz

- voice & data

23
Q

UMTS

A
  • 5 MHz

- voice & data

24
Q

LTE

A
  • 1.4 - 20 MHz

- data

25
Q

NR (VoLTE)

A
  • 100 MHz

- data

26
Q

Unmodulated sine wave BW

A

0

27
Q

Amplitude Modulated sine wave

A

2 times baseband BW; maximum

28
Q

Frequency Modulated sine wave

A

2 times baseband BW; minimum

29
Q

Analogue to digital conversion

A
  • Filtering
  • Sampling
  • Quantizing
  • Encoding
  • Streaming
30
Q

Components of cellular

A

a) Mobile devices
- cellphones
- credit card readers
- rental cars
- IoT
b) Base station
c) Central controller

Electronics (13 decks)

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