Rasengan said:
At least 500MHZ+......definitely can't buy the oscilloscope so I was thinking if there is some sort of circuit that can help the oscilloscope see the signal in frequency time domain....would it be possible???
Thanks
A bit of terminology:
Time Domain, plotting the amplitude on the Y-axis, against time on the x-axis. Use an oscilloscope.
Frequency Domain, plotting the amplitude on the Y-axis, against frequency on the x-axis. Use a spectrum analyser.
Frequency Time Domain, a new one on me???
If you want to go probing around RF circuits to try and understand their operation, I suggest that you do not go to 500 Mhz+. You will affect the circuit you are investigating as soon as you put your hand near it, let alone touch it with a probe.
I suggest that you start off with circuits operating at less than 2 Mhz, layout and stray capacitance effects are a lot less down there.
PC sound card based software spectrum analysers are generally only good for audio frequencies.
Real RF spectrum analysers are expensive, even old second hand (good) ones will cost £500+
JimB