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  1. Someone Else Someone Else

    Any Ham Radio Operators here?

    Tuesday, 16-Dec-14 00:56:57 UTC from web
    1. Techdisk Techdisk

      @anobjectofinterest I wish I was. I do know a LOT about radio, though.

      Tuesday, 16-Dec-14 00:58:18 UTC from web
      1. Techdisk Techdisk

        @techdisk (as in, I just took an entire course on it)

        Tuesday, 16-Dec-14 00:58:45 UTC from web
        1. Someone Else Someone Else

          @techdisk Neat

          Tuesday, 16-Dec-14 00:59:29 UTC from web
      2. Someone Else Someone Else

        @techdisk Kewl. You actually done any broadcasting?

        Tuesday, 16-Dec-14 00:59:09 UTC from web
        1. Techdisk Techdisk

          @anobjectofinterest Nope. I plan to get myself a liscense at some point, though.

          Tuesday, 16-Dec-14 01:00:08 UTC from web
          1. Someone Else Someone Else

            @techdisk So now, you can LEGALLY holler at people over the air.

            Tuesday, 16-Dec-14 01:01:22 UTC from web
            1. Techdisk Techdisk

              @anobjectofinterest (well you technically do that already with your cellphone, but yes.)

              Tuesday, 16-Dec-14 01:02:02 UTC from web
              1. Someone Else Someone Else

                @techdisk I'd like to hear what using a pulse wave for modulation would sound like...

                Tuesday, 16-Dec-14 01:03:14 UTC from web
                1. Techdisk Techdisk

                  @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.

                  Tuesday, 16-Dec-14 01:05:34 UTC from web
                  1. Someone Else Someone Else

                    @techdisk Well yes, but if the range is small enough The FCC/Ofcom/whatever body won't notice.

                    Tuesday, 16-Dec-14 01:07:18 UTC from web
                    1. Techdisk Techdisk

                      @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.

                      Tuesday, 16-Dec-14 01:08:33 UTC from web
                    2. Techdisk Techdisk

                      @anobjectofinterest But really all you need is a tank circuit and a Pi filter and all those harmonics are gone.

                      Tuesday, 16-Dec-14 01:10:42 UTC from web
                      1. Someone Else Someone Else

                        @techdisk Tank Circuit?

                        Tuesday, 16-Dec-14 01:11:07 UTC from web
                        1. Techdisk Techdisk

                          @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.

                          Tuesday, 16-Dec-14 01:12:27 UTC from web
                          1. Someone Else Someone Else

                            @techdisk Oh, okay.

                            Tuesday, 16-Dec-14 01:14:26 UTC from web
                            1. Techdisk Techdisk

                              @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.

                              Tuesday, 16-Dec-14 01:15:31 UTC from web
                              1. Someone Else Someone Else

                                @techdisk Well then, bravo! Have you ever used PWN for this kind of stuff?

                                Tuesday, 16-Dec-14 01:17:09 UTC from web
                                1. Someone Else Someone Else

                                  @anobjectofinterest *PWM

                                  Tuesday, 16-Dec-14 01:17:22 UTC from web
                                  1. Techdisk Techdisk

                                    @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.

                                    Tuesday, 16-Dec-14 01:18:12 UTC from web
                                    1. Someone Else Someone Else

                                      @techdisk Even on the frequencies CB uses?

                                      Tuesday, 16-Dec-14 01:19:26 UTC from web
                                      1. Techdisk Techdisk

                                        @anobjectofinterest Well you do need a CB license to use CB frequencies, right?

                                        Tuesday, 16-Dec-14 01:21:12 UTC from web
                                        1. Someone Else Someone Else

                                          @techdisk Nope. Anyone

                                          Tuesday, 16-Dec-14 01:21:45 UTC from web
                                          1. Techdisk Techdisk

                                            @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.

                                            Tuesday, 16-Dec-14 01:26:20 UTC from web
                                            1. Matt Matt

                                              @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.

                                              Tuesday, 16-Dec-14 01:33:00 UTC from web