AM transmitter

  
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As with your square wave, you will interfere with people`s radios, & they will become quite upset, plus you may attract the attention of the licencing authority-& believe me, you don`t want that! you need I believe a colpits oscilator, this will have a `tank circuit` in it that is the Lc part and will produce a sine wave. Use only as much power as you need.
AM transmitter - schematic

I`d suggest one of the frequencies used by AM radio as they are seldom used and just enough power to transmit as far as you need. you need I believe a colpits oscilator, this will have a "tank circuit" in it that is the Lc part and will produce a sine wave. Use only as much power as you need. I`d suggest one of the frequencies used by AM radio as they are seldom used and just enough power to transmit as far as you need. well due the the not excellent coverage in the UK most are forced to listen to the radio via the internet. I guess that is why we are having to scale up our internet network - just so we can listen to the godamn radio My paramount suggestion is keep the power as low as possible, if it is just a carrier it should not upset reception to other devices too much unless they are the same distance as the intended receiver (5 meters ) I would go for a clapp oscillator as they are a bit more stable than the colpitts but if you only want a 1khz signal a wein bridge circuit would be better as no inductance is required. There are reasons why people don`t just choose frequencies at random to do stuff, & that is because the Radio Spectrum is already allocated to various services, who don`t want your little "drifty" oscillator to interfere with them!



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