I've just ordered an Ardunio and had a thought, is this even possible?...
Creating an AM circuit detector in analog on my breadboard, feed the analog out to the analog in, and gnd to gnd? on the Ardinuio? I presume the analogue voltage represents the signal sent right?....
My analogue circuit will simply grab the waveform and filter out a specific frequency,just before going into the arduino, a signal diode to cut half the waveform, now, let's suppose the frequency was 55mhz we filter out all other waveforms from the signal....
Could the Arduino / risc processor sample fast enough to send back through the usb cable and into the pc over a com port to then collect through a program and play back the signal the analogue detector is receiving ?
If it is, I'm going to try it when it finally arrives
fingers crossed it arrives this week so i can get started 
Creating an AM circuit detector in analog on my breadboard, feed the analog out to the analog in, and gnd to gnd? on the Ardinuio? I presume the analogue voltage represents the signal sent right?....
My analogue circuit will simply grab the waveform and filter out a specific frequency,just before going into the arduino, a signal diode to cut half the waveform, now, let's suppose the frequency was 55mhz we filter out all other waveforms from the signal....
Could the Arduino / risc processor sample fast enough to send back through the usb cable and into the pc over a com port to then collect through a program and play back the signal the analogue detector is receiving ?
If it is, I'm going to try it when it finally arrives