PC2: Signal Flow and Link Budgets Flashcards
Increases the magnitude of signals
Basic RF Components Terminology
Amplifier
Decreases the magnitude of signals
Basic RF Components Terminology
Attenuator
Changes the frequency response of the system
Basic RF Components Terminology
Filter
Changes the signal path
Basic RF Components Terminology
Switch
Combines signals
Basic RF Components Terminology
Mixer
Produces signals
Basic RF Components Terminology
Oscillator
Connects components
Basic RF Components Terminology
Transmission Line
Combines multiple streams of data into one baseband signal
Transmitter Components
Multiplexer (MUX)
Overlays baseband data onto a carrier wave resulting in the creation of the intermediate frequency (IF)
Transmitter Components
Modulator (MOD)
Increase the modulated waveform from the intermediate frequency IF to the transmit radiofrequency (RF)
Transmitter Components
Upconverter
Raise the signal power to the required output level
Transmitter Components
High Power Amplifier (HPA)
Raises the received low-power signal with minimal addition to noise
Receiver Components
Low Noise Amplifier (LNA)
Converts the received RF to the IF frequency
Receiver Components
Down Converter
Extracts the baseband signal
Receiver Components
Demodulator (DEMOD)
Takes one single combined baseband signal and distributes it to individual output lines
Receiver Components
Demultiplexer (DEMUX)
In Triangle math, going up, you would?
Add
Subtract, down
In Triangle math, going from Tx to Rx, what would you do with TTF?
Do the sign
If Rx to Tx (right to left or “backwards”), do the opposite
Cannot send and receive at the same time
Transceivers Basics
Half Duplex
Can send and receive simultaneously (at the same time)
Transceivers Basics
Full Duplex
Allows a single antenna to transmit and receive signals
Transceivers Basics
Duplexer
The power level required for an isotropic antenna to achieve the same Ψ as the directional antenna
Link Budget
Effective Isotropic Radiated Power (EIRP)
- Loss caused by EM energy spreading out as it travels through space
- Ratio of TX to RX power as a signal travels through a vacuum
Link Budget
Free Space Path Loss (FSPL)
Also called Path Loss, Space Loss, or Spreading Loss
The difference between received signal strength and the modems receive sensitivity
Link Budget
Fade Margin
Note: Also provides a buffer for unexpected signal loss
