I then walked around each of the radios and listened for a) any noticeable interference in the transmission and b) any underlying hiss or noise in the channel. Most radios did very well; however, the Flex had particularly poor reception. The station came in clearly when I grabbed onto the ...
Most of the older (tube type, and AM only) radios had a loop inside the back panel. Quite different from the loop stick, but similar electrical properties. Car antennas don’t match the wavelengths for AM broadcast. Never have. That’s a case where matching matters less for receivers. (...
There was a brief boom in battery-powered portable radios from 1923 to 1927, but by 1930 most household radios ran from AC mains power and receivers became larger, heavy and non-portable. The primary restriction on their mobility was that they needed to be connected to mains electrical power;...