The friend’s radio didn’t come with a frequency display, and buying the add-on would cost more than the radio did. So [Todd] has set out to build an Arduino frequency counter for a Kenwood TS ...

In the ham radio trade, gear such as the old Drake units ... [Scott] also added amenities like a digital frequency display, optical encoder with crank-style knob to change frequency, ...

The Sierra 303B debuted circa 1974, covers a frequency range of 9 kHz–3.3 MHz, has AM/LSB/USB mode selection, a large (4 in. x 3 in.) signal meter that’s internally calibratable, selectable input ...

A dedicated group here and others across the U.S. test their emergency skills by seeing how many contacts they can make in 24 hours.