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Any Ham Radio Operators here?
Tuesday, 16-Dec-14 00:56:57 UTC from web-
@anobjectofinterest I wish I was. I do know a LOT about radio, though.
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@techdisk Kewl. You actually done any broadcasting?
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@techdisk Neat
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@anobjectofinterest Nope. I plan to get myself a liscense at some point, though.
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@techdisk So now, you can LEGALLY holler at people over the air.
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@anobjectofinterest (well you technically do that already with your cellphone, but yes.)
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@techdisk I'd like to hear what using a pulse wave for modulation would sound like...
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@anobjectofinterest You mean after demodulation? Because after demodulation it would just be a pulse wave. If your using a square wave to transmit as the carrier, you're putting out LOADS of harmonics that interfere with other radio stations, which is illegal.
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@techdisk Well yes, but if the range is small enough The FCC/Ofcom/whatever body won't notice.
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@anobjectofinterest Well in that case it would work absolutely fine for FM. In fact the Raspberry Pi can transmit FM using square waves on it's own, and it sounds fine, though you can hear the transmission on a bunch of other channels.
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@anobjectofinterest But really all you need is a tank circuit and a Pi filter and all those harmonics are gone.
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@techdisk Tank Circuit?
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@anobjectofinterest A capacitor and a coil in parallel. It's a tuneable oscillator. It can take a pulse wave and use it to make a clean sine wave.
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@techdisk Oh, okay.
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@anobjectofinterest As I said, I kinda took a whole course dedicated to how radio waves work and propagate. Hell, I built myself a fully functional AM/FM radio from scratch.
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@techdisk Well then, bravo! Have you ever used PWN for this kind of stuff?
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@anobjectofinterest Well that's how the Raspberry Pi does it, so indirectly. We weren't allowed to build our own strong transmitters because that's kinda illegal.
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@techdisk Even on the frequencies CB uses?
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@anobjectofinterest Well you do need a CB license to use CB frequencies, right?
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@techdisk Nope. Anyone
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@anobjectofinterest I'm pretty sure you do, but if it were open then sure you can do that. However I'm not sure CB uses FM.
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@techdisk You do not need a license to use CB. You need to abide by the FCC regulations, but having a license is not one of them.
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