In article .com,
ShutterMan wrote:

Good answers from everyone, thank you. In looking at the simplest of
tank circuits for radio, I just couldnt understand why you just cant
add more coil windings and different capacitance to increase frequency
coverage.....but it looks like its alot more complicated than that.
Thanks again.

One thing that I didn't see mentioned, was that many Short-wave
Broadcast stations are using Synchronous AM transmission. I understand
this is a form of double sideband with reduced carrier. It can be tuned
by a Single Sideband receiver, but it is difficult to tune music so it
sounds right. It sounds somewhat distorted on an AM radio.

For SWL use, I would look for a Short-wave Receiver that had a true
Synchronous AM detector in addition to the other modes. I don't think
you will find that in many Ham Radio transceivers!

Fred
K4DII