17
LET ME EXPLAIN these coils that were giving Guppa so much trouble. The reason one radio can pick up signals that another cannot is that each of them is tuned to a different range of radio frequencies. The radio that Guppa was building for me would detect signals in the range of frequencies that are called “shortwave.” Now within that broad range lie narrower “bands.” The receiver would be able to receive signals in many of these bands, depending on which coil was plugged into its circuit. To change from one band to another, all I would have to do was unplug one coil and plug in another. The coils were to be wound on hollow Bakelite forms with pins projecting from their bases that could be inserted into sockets like those into which vacuum tubes were inserted.
When Guppa and I were looking through his back issues of Impractical Craftsman to decide what sort of radio we would build, we had found other, simpler radios, but Guppa had liked the notion of winding these coils by hand, and the thin, shiny wire had appealed to him as soon as he saw it in the electrical gadget store, but what had really persuaded him that this radio was just the one for us to build was the description of the work that appeared in the article: the hours of baffling precision work.
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🎧 88: Let me explain . . .