Total posts : 45366
I would stay away from that! It was good for its time because it was the only very simple way to construct an FM TX with stereo audio.
But that chip has way too many problems that even with the published modifications done by end users over the years, the chip is still inferior and less than an optimum choice these days.
If your going to make an FM TX with a chip at the heart of the whole thing, then use the BH1415 instead.
But if you want real performance, I suggest building your FM TX from discrete components that form circuit sections of the whole so you have better specifications like stereo separation, signal to noise ratio, ability to adjust pilot and 38 sub null, inject RDS and a ton of other things.