Generating RF from a PIC

[Ioannis]

I am not sure of what you are trying to do. But as far as it concerns the oscillator of the PIC, yes, you can use a buffer and take a copy of the OSC signal. But remember, this is a rectangular signal (TTL logic) and not sinus. If you want a pure RF signal you have to filter it very hard after the buffer.

Ioannis

[Qacer]

Hi Ioannis,

A low pass filter should be able to filter out the sharp edges and make the square look closer to a sine wave. For frequency modulation, a square wave should be suitable since its amplitude is not a main factor in the demodulation of the transmitted signal.

[mister_e]

There's some RFPIC who do the job for you. See Microchip website for that.
http://www.microchip.com/ParamChartS...g=en&pageId=74

[Ioannis]

For frequency modulation, a square wave should be suitable since its amplitude is not a main factor in the demodulation of the transmitted signal.

What exaclty are you trying to do?

Ioannis

[Qacer]

Hi Ioannis,

I was just saying that if he were to transmit and audio signal, then he can use the 3-4 MHz clock signal from the PIC for frequency modulation. He can mix the audio signal and the clock frequency with a mixer and transmit the frequency modulated signal.

[mister_e]

i'll certainely prefer to use dedicated RF modules for that.

See
http://www.linxtechnologies.com/
www.laipac.com

[Ioannis]

Agree with Steve. Might seems easy to do, but I'd prefer to use ready made solutions. I am too old for such adventures...! I did that when I was 15 (PLL for RF from scratch with TTL counters, Receivers with discrete components in the VHF region) but then time was all mine!

Ioannis

[Qacer]

I guess I have a lot of catching up to do.