5 ms·

You can listen to that on baby monitors. Also broadcasting on "broadcast FM bands" is frowned upon world-wide. The 49MHz band is for experimentation as assigned

• raverbashing 12y ago
  In practice, a transmitter like that doesn't go much further than 50meters, there isn't enough power
  • kefka 12y ago
    Sigh. Spoken like someone who hasn't troubleshooted badly acting radio hardware/software. 1. Depending on antenna, can go very long distances. I've seen crap omni's used for QRP work, and still go hundreds of miles. This very much depends on frequency, ground-wave propagation, current ionosphere status, and solar activity. 2. There are limitations on harmonics. And in the said circuit, it is a great reference circuit. However, harmonics will bleed into other bands. Not Good.
    • raverbashing 12y ago
      1. Sure, what I meant was "for this type of transmitter in an amateur setting and frequency range ~ 100MHz", where the antenna is usually a wire poking out and the transmitter is inside of a building If you're doing QRP work with a professional antenna and a different frequency band (and good receptors), you're right, it can go very far 2. Yes, harmonics are an important issue. I'm not sure how they would behave in a "bad quality" circuit like this (even though "bad quality" usually mean more harmonics, the fact that you have a general purpose transistor, component leads, traces, etc, all contribute to prevent them from being amplified too much in the first place, if you're at 50MHz you'll surely have 2nd, 3rd, but probably not much beyond that)
• deleted 12y ago
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