Скачать или смотреть 116.4a Signal Attenuation and Decibel (dB) Ratio | A2 Communication | A Level Physics

How do we quantify power loss when transmitting a signal by wired or wireless channels?
00:00 Wifi and Phone signal
01:19 Attenuation and signal-to-noise ratio
04:02 Decibel log scale ratio
09:51 Why use log10?
15:54 Attenuation per unit length
19:27 GPS and Satellite Signals (GPS Essential app)

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   • Ch116 Communication | A Level Physics [ARC...  

Practice Past Year Questions:
*starred Q's are in example videos
MJ10 P41 Q12 (pg8) Telephone & Optic Fibre
MJ11 P41 Q12 (pg10) Coaxial cable ratio
ON10 P42 Q11 (pg8) Wire Mic Max Length*
ON11 P42 Q12 (pg11) attenuation of optic fibre
ON11 P41 Q10c (pg12) Min Signal of optic fibre
MJ12 P42 Q11 (pg13) Regenerator & Satellite
ON12 P41 Q12 (pg14) Wire Pair signal to noise
ON12 P43 Q12 (pg15) Max uninterrupted length
MJ13 P41 Q12 (pg16) Optic Fiber attenuation
ON13 P41 Q12 (pg18) Distance of low attenuation
ON13 P43 Q12 (pg18) Signal received by satellite

MJ14 P42 Q14 (pg19) Transmission ratio
ON14 P41 Q12 (pg20) power signal satellite
MJ15 P41 Q12 (pg21) input power of optic fibre*
MJ15 P42 Q11 (pg21) Coaxial cables in TV*
ON15 P41 Q12 (pg22) Attenuation of Infra-red
MJ16 P42 Q5 (pg26) Min signal power
ON16 P41 Q4 (pg27) Noise & Optic Fibre*
MJ17 P41 Q3 (pg27) ADC & Optic fibre*
ON17 P41 Q4 (pg28) Coaxial Cable signal loss
MJ18 P41 Q5 (pg31) Geostationary & down-link
FM19 P42 Q4 (pg34) Features of Geostationary*
MJ19 P42 Q5 (pg34) Amplifier in transmission line

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