Start here:Any advice on how to design simply 86.79 MHz FSK Transmitter with following parameters?
4.5 kHz max. modulation stroke
Are there any chips that could help simplify the design?
That is true, the 555 will not operate at that frequency. Any advice we give you will be useless to you because you apparently lack the basic fundamental knowledge required to succeed at this enterprise. In other words you definitely need to study before you go looking for advice. You seem to be oblivious to the notion that the RF spectrum is not there for your exlusive use and amusement. Causing harmful interference with your experiments could lead to large fines or jail time in the federal slammer. Federal judges are not people you want to mess with, even if you can afford an expensive lawyer.
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by Jake Hertz