interest · KE0TOJ

Amateur radio

Licensed through a Scout radio club, and still happiest when the antenna on the other end of the coax is one he built himself.

How it started

Kian earned his amateur radio license, callsign KE0TOJ, through Boy Scouts, as a member of a Scout radio club called the Order of the Aerial, a nod to Scouting's Order of the Arrow. With the club he operated at Field Day in both summer and winter, at jamborees, and at other on-air events, the kind of portable, set-it-up-in-a-field operating where the station has to work with whatever power and antenna you brought.

Building antennas

The part that stuck was building. Kian has made J-pole antennas and directional antennas by hand and put them through testing on the air. It's the same loop as his engineering work: build it to a design, measure how it actually performs, and adjust until the two agree.

On the equipment side, he runs a dual-band VHF/UHF Baofeng handheld and has installed a mobile radio in his car.

Diagram of a J-pole antenna: a half-wave radiator rising above a quarter-wave matching section, with the feed line tapped onto the matching section above its shorted base. radiator ½ wave matching section ¼ wave shorted base feed point feed line to radio
How a J-pole works: a half-wave radiator sits on top of a quarter-wave matching section, and sliding the feed point up or down that section is how the antenna gets matched to the radio.