Day 7 - Signal Flow/Link Budgets Flashcards
What increases the magnitude of signals?
Amplifier
What decreases the magnitude of signals?
Attentuator
What changes the frequency response of the system?
Filter
What changes a signal path?
Switch
What combines signals?
Mixer
What produces signals?
Oscillator
What connects components?
Transmission Line
What combines multiple streams of data into one baseband signal?
Multiplexer (MUX)
What does a modulator do?
Overlays the baseband data onto a carrier wave that results in the intermediate frequency (IF).
Creates the IF.
What increases the modulated waveform from the IF to the RF?
Up Converter
What does the HPA do?
The High Powered Amplifier raises the signal power to the required output level.
What raises the received low-power signal with minimal addition to noise? (signal is received from the satellite)
LNA (Low Noise Amplifier)
What does the Down Converter do?
Converts the received RF to IF frequency.
What extracts the baseband signal (from the IF)?
Demodulator
What does the DEMUX do?
Takes one combined baseband signal and distributes it to individual output lines.
What is the difference between Half Duplex and Full Duplex?
Half Duplex cannot send and receive at the same time; Full Duplex can send and receive simultaneously.
Walkie vs Cell
What does a Duplexer do?
Allows a single antenna to transmit and receive signals.
What is the power level required for an isotropic antenna to achieve the same power as the directional antenna?
EIRP (Effective Isotropic Radiated Power). “signal strength”.
What is loss caused by EM energy spreading out as it travels through space?
Free Space Path Loss
Flashlight energy gets dimmer as it travels.
What is Fade Margin?
The difference between received signal strength and the modem’s receive sensitivity.
