AVR-Chat

I have a high frequency signal (about 7-8 MHz) which is modulated by on/off switching.
To recover the modulation - to feed into an AVR (probably ATTiny) - I could use a retriggerable monostable e.g. 74123 timed such that it remained tripped while carrier present but flopped back after a missing pulse (or two).
Any ideas on using the AVR to do this? I could see how to do it in code if the frequency were lower - but 8MHz input with a 10MHz clock seems unrealistic?

George Smith

On 10-Oct-10 14:06, gm4xus wrote:
> I have a high frequency signal (about 7-8 MHz) which is modulated by on/off switching.
> To recover the modulation - to feed into an AVR (probably ATTiny) - I could use a retriggerable monostable e.g. 74123 timed such that it remained tripped while carrier present but flopped back after a missing pulse (or two).
> Any ideas on using the AVR to do this? I could see how to do it in code if the frequency were lower - but 8MHz input with a 10MHz clock seems unrealistic?
>
> George Smith
>

     Feed it to T0 or T1 and watch TCNT0 or TCNT1.
     Whenever they are changing, you have carrier.

     Mark Jordan