Why does HF travel further than VHF?

Only a line of sight between a sending and receiving antenna will allow VHF waves to function. They are, therefore, most effective over short and medium distances. On the other hand, HF radio waves are reflected off the ionosphere. This

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How does SSB radio work?

To transmit the operator's voice in less than half the bandwidth of an AM signal and with far higher energy efficiency, an SSB radio transmitter mutes the carrier and one of the redundant sidebands.

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