Portable radio

Michelle and Don stopped by this morning to pick up some amateur radio gear I got from Dad that I’m no longer using. We stood around talking for a while, and Don showed me the prototype of a large variable air capacitor he’s fabricating for use in magnetic loop antennas. So of course I had to show off my latest project: a portable box containing a low-power transceiver, digital interface, power supply, antenna tuner, and antenna.

OK, in terms of raw geek street cred, my portable radio box isn’t as cool as fabricating a large variable air capacitor. But it’s worth something as a small piece of systems engineering that addresses a specific problem that I face: our new house is clad with stucco on wire mesh, which means I live inside what is essentially a Faraday cage; and the landlord does not allow permanent outdoor antenna installations (let’s face it, most visitors to a cemetery don’t want to see a big antenna array). Now I can grab this box, walk out to our fenced-in patio, sit down and get on the air. Mind you, as with any good DIY maker-type project, there is room for improvement and expansion: it definitely needs a door on the front to protect everything; I’d like to add a straight key for Morse code and a space to store an Android tablet for digital modes; I’m thinking of a separate battery and solar cell unit to go with this; maybe someday I’ll add a small linear amp. But in the mean time, this works as is, and it was fun to sit outside in the sun yesterday and monitor the mobile maritime net.

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