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> Some people wanted to know if this is doable with an Arduino. The Arduino simply can't toggle its digital out fast enough to transmit at this frequency

There is no need to be able to toggle a pin fast enough to be able to transmit at a given frequency. You can rely on the harmonics to get you to a much higher frequency than your code is toggling the pins.

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Which means the output will be lousy with harmonics and intermodulation. Even a tight band-pass filter won't clean up the mess.

It will be anyway. To create clean RF isn't all that simple.

It isn't simple if you use the wrong tools for the job. It can be simple if you don't generate square waves.

http://ok1ike.c-a-v.com/gnat_40.pdf

There are 100's of similar simple circuits that generate RF that is clean enough.

Right up until you hook up that spectrum analyzer...

Have a read of any of the Amateur Radio books and magazines over the past hundred years or so.

There are no shortage of simple Analog transmitters which meet FCC specs.

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