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A 1950s Hewlett-Packard 608C VHF Signal Generator used to test high performance radio receivers, which pick through all waves coming at it and covert the radio waves into audio. A radio transmitter produces radio waves on a range of frequencies by changing the frequency and amplitude of the waves, it can transmit voice or data. Old Technology, Radio Wave, Control Panels, Hewlett Packard, Ham Radio, Covert, Frequencies, Fire Department, Hifi
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Old Technology

A 1950s Hewlett-Packard 608C VHF Signal Generator used to test high performance radio receivers, which pick through all waves coming at it and covert the radio waves into audio.… 
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