How precise and accurate does the 50% duty cycle have be? I don't recall you saying. If the frequency is unchanging, how about a monostable with a period of 1/2 the period of your transmit frequency, triggered by the leading edge of your 20% pulse. 3.33333mS for your 150Hz frequency signal.
Or, is there something else I'm missing.
Ken
I think that a 555 monostable circuit it will be great.The precision must be 45% to 55% duty cycle.I think you understand what I want.Sorry if my English aren't so good.I will try all these ideas soon and I will let you know.Thanks
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