I think I'm not explaining myself well again. What I want to see in the time domain is a single carrier of an 8mhz signal. That's why I was referring to the zero-span function of spectrum analyzers.
I have tried to isolate a single 1K carrier using filters but I did not get good results. That is why I was looking for something simpler, where simply indicating the frequency, I would have the output that specific frequency in the time domain. Something like a very narrow band raw iq(or magnitude) demodulator
