Re: Tuning into an square wave radio transmitter

On Thu, 26 May 2005 18:01:29 +0200, "Anders Nesheim Vinje"
<a-vinje@xxxxxxxxxx> wrote:

>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??

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

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

2. What do you mean by "sender"?

3. 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 ????

4. 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
.

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