The first portable radio was really bulky compared to today's standards, but was technically portable. Called the "Portaphone" it was developed by the US Bureau of Standards in Washington in 1920. As with many discoveries and inventions, the military and war precipitated the first truly portable radios (defined as usable while a person is in motion). read more
According to Zenith's website; "The young company’s early accomplishments included the world’s first portable radio (1924), the first home radio receivers to operate on household current (1926), and the first automatic push-button radio tuning (1927)." Heritage - Zenith Electronics. The 1924 Zenith Companion Portable is very rare. read more
Sir Arnald Johnston aged 56 was the man who invented the first portable radio. read more