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Tuning into an square wave radio transmitter

--- Could you supply a little more detail, please?

  1. What do you mean by a "1MHZ square wave radio signal"?

  1. What do you mean by "sender"?

  2. When you say that you're sending it as digital data to a PIC, do you mean that you have the 1MHz signal connected to it directly, or do you mean that you're sending it as a CWRF signal, or do you mean that you're modulating a carrier with a 1MHz square wave, or ????

  1. If you run the 1MHz square wave signal through either a lowpass or a bandpass filter such as the tank (the parallel LC) you've described, the harmonics of the square wave will be attenuated and the output of the filter will be mostly a sine wave with the same period as the square wave. Is that what you want?

-- John Fields Professional Circuit Designer

Reply to
John Fields
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Hello. I was wondering how to filter out a 1MHZ square wave radio signal. I got the sender working correcly. I am sending this as digital data to a pic controller. My first thought was to use capacitor and a coil in paralell. And find the high impedance frequency by using the formula 1 / (2pi * squarerot(C*L)). Now i am not so sure. I guess this only works for a sinewave signal. So does anyone know how to filter out any other signals below and above 1 MHZ of a square wave signal??

Thanks in advance.

Anders N. Vinje

Reply to
Anders Nesheim Vinje

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--
That is a VERY, VERY BAD idea.  Not only will the amount of 1MHz you
broadcast be very small, depending on the length of the antenna you
could be causing someone some real grief since a square wave contains
an infinite number of odd harmonics which you will also be
broadcasting.  I\'m pretty sure it\'s also illegal.
Reply to
John Fields

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The purpose is to recive the 1Mhz signal and translate to a 1 when signal is present and 0 when not present. I do need much data transfer since it only is supposed to control 2 electric motors. After amplification and rectifing (and tuning) i was thinking of using a capacitor to ground, charging up when the signal is present so its dc componet will be close to 5 volt. And a 5,1 volts zenerdiode to limit the voltage. Then have a resistor to ground so its allowed to charge out when the signal is no longer present. This might be a stupid idea on how to transmit data from one device to another but i am kinda new to this so any other suggestions would be much appricated. The only thing is that i want it to be simple and that only signal that can be recived is the 1 Mhz.square wave. I guess that modulating it with a sine signal and then tune into that frequency on the reciver might an option to. Or if its possible to convert the square wave to a sine signal at the transmitter might be even better. Well i am open for suggestions.

Will this convert the square wave into a sine wave at the samme frequency??

Thank for you answers.

Anders N. Vinje

Reply to
Anders Nesheim Vinje

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