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15D03 — Baofeng UV-9R+

Collected notes on the topic of radio communications.

Realize that the strict control of the ability to transmit is due to the fear of the state, they realize that radio is a decentralized form of communication that can be used to question their power.

Frequencies below about 30MHz are reflected off the atmosphere, thus they can follow the Earth's curvature. So these low frequency signals can sometimes be received by radios below the horizon hundreds of miles away. As a general rule, the lower the frequency, the greater distance it can travel. Unlike frequencies below 30MHz, radio waves in higher frequencies(VHF/UHF) travel in straight lines (line-of-sight) generally cannot travel beyond the horizon.

VHF (Very High Frequency)130-174MHz
UHF (Ultra High Frequency)400-520MHz

Multi-Use Radio Service

MURS comprises the following five frequencies:

authorized bandwidth
Channel name
1151.82 MHz11.25 kHzMURS 1
2151.88 MHz11.25 kHzMURS 2
3151.94 MHz11.25 kHzMURS 3
4154.57 MHz20.00 kHzBlue Dot
5154.60 MHz20.00 kHzGreen Dot

Family Radio Service

The FRS uses channelized frequencies around 462 and 467 MHz in the ultra high frequency (UHF) band.

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