I14R10
Full Member level 3
The story goes like this. I want to build FM transmitter for 145MHz. At that high frequency oscillator like this one
will never be stable enough. So I will use either overtone crystal oscillator or oscillator like that one in the picture, but with PLL. But I will ask about that later, this is what I want to ask.
I have a signal from microphone and I have RF signal from oscillator, 145MHz frequency. I want to modulate that RF signal with signal from microphone. How do I do that? All that I can find is this
But this is not what I want, I want FM modulator that takes RF and AF in and outputs FM signal. Is it even possible? How does professional radios do FM modulation?
will never be stable enough. So I will use either overtone crystal oscillator or oscillator like that one in the picture, but with PLL. But I will ask about that later, this is what I want to ask.
I have a signal from microphone and I have RF signal from oscillator, 145MHz frequency. I want to modulate that RF signal with signal from microphone. How do I do that? All that I can find is this
But this is not what I want, I want FM modulator that takes RF and AF in and outputs FM signal. Is it even possible? How does professional radios do FM modulation?
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