Therian,
First all, I've stated 250nS in my previos posts. That is of course wrong and should be 200nS. NOT 250.

With that being said you could go to a PIC capable of 40MHz, then a single cycle instruction (like NOP) is executed in 100nS instead of 200.

But then again if you use software to generate the carrier frequency you'd be hard pressed to have any instruction cycles left to be able modulate it. I really believe you should look at a dedicated TX/RX chipset or module.

Anyway sorry for the confusion. One instruction cylcle is 200nS at 20Mhz, nothing else.

/Henrik Olsson.