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could i make an AM transmitter using PIC

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vinodstanur

vinodstanur

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Is it possible to build an AM transmitter using PIC microcontroller?
I just asked this because I know it is easy to make frequencies like 1000kHz or like that using PIC. ;-)
 

It would be restricted to a few fixed frequencies, that can be generated as integer part of the clock frequency by a timer unit, and to on-off-keying (OOK).
 

you can use DDS to achieve arbitrary frenquencies up to some max value relative do the clock.

DDS means direct digital synthesis, ie, you use a sin table and a DAC to generate a senoidal signal directly.

its not hard to do at lower frequencies like those used by AM Radios.
 

u mean?.......
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I assume, that a transmiter would be required to have a stable frequency. This can only work, if the output signal (either a squarewave or a the data send to a DAC) are send by the processor through a hardware with crystal accurate timing, e.g. a timer output or pwm unit. It won't work sending the data by software instructions.

The other consideration is, that it will be difficult to apply analog modulation. So I assume, the transmitter is restricted to OOK.

DDS is a principle option, but would only allow rather low transmitter frequencies (in the 100 kHz range) with 8-bit PICs.
 
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