Another note: since in the US there are only four letters allowed as the first letter (A, K, N, or W) and will be 4-6 characters with further restrictions on which can be letters and which can be numbers (2-by-3 being the most common, 1-by-2 and 2-by-1 only being available to higher license classes, where those are the numbers of letters before and after the region identifying number). You could use this in your detective story, along with other details like inferring where they got their license from or getting more details from the FCC. Following this up with an inspection of the radio and which frequency was recently used, could make for some interesting detective work. Ham Radio doesn't make very many appearances as a plot device.

Obviously really expensive for what is at the core a spring and an electric contact or two (depending on type) — which can be just one part at the expense of longevity, but as hobby pieces it seems quite reasonable, I’ve seen way worse spends from friends who fell in love with mechanical keyboards.

(It's not Hi Hi like most people think)

Old brass pounder here.

   --... ...--

  .--  ....  .-  -  |  -...  ..  --..  .-  .-.  .-.  .  |  --  ..  -.  -..  |  -.-.  .-.  .  .-  -  .  -..  |  -  ....  .  ...  .  |  ..--..