L1 and the hand-made capacitor are arranged in a tank circuit. One side is connected to an antenna. The other, to ground. A short-wave radio can be used to help find the resonant frequency. A multi-meter can be used to measure the voltage between the coil and the antenna. I’m seeing 5.028Mhz (or thereabouts) which corresponds to my crude cap and coil measurements. The Q appears to be quite high, which makes sense since the L1 coil is only 10 turns of #20 copper wire and hence its resistance is very small. The basket weave also probably is a huge benefit for high Q values for this tank circuit. I realize that the coilpacitor is more than that. It is also an antenna too. So its a coilpacitortenna? LOL. Radio engineers of his day were very clever this way.
4 power options; hand-crank generator 3 AA batteries AC adapter (not included) or NiMH battery pack
Tunes AM/FM and 7 shortwave bands including weather radio
Features emergency lights plus a flashing beacon mode; built-in siren for emergencies
Tuning knob features a superimposed fine tuning control knob
3.5 mm cell phone charger output jack (includes other plugs); 1-year warranty
Product DescriptionYou don?t need batteries to power this device. Just turn the crank to tune into AM and FM radio, plus seven bands of shortwave. The crank also powers the built-in flashlight, so you?ll never be caught in the dark. And you?ll never be caught with a dead cell phone battery. Plug the phone in, and with a few turns of the crank, you can power up your cell phone. Anytime you need to stay in touch, we?re there. You?ll be prepared for any emergency, and there?s an added be. . . More >>
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