Scott,
I have no idea about the tuning of a 12-string guitar, never having played guitar myself before I took up Bass.
What I would like to say is, the fact of "SSB or Single Side Band".
To have a radio signal in most cases, you require 3 things, a carrier and 2 side-bands, the side-bands being each side of the carrier.
The distance between them on the Electromagnetic Spectrum, is known as thier Bandwidth.
With AM (amplitude-modulated) signals, you have a situation where the side-bands are modulated in sympathy with the audio signal and they vary in amplitude according to the voice or input frequency.
FM or Frequency Modulation, works on a more linear situation, where the side-bands are pre-determined.
They are constant, the voice frequency is an effect of time not amplitude of the signal.
Now, to add the Single Side Band idea.
Both of these systems can be called Double Sideband, because they both have 2 sidebands.
What Single Side Band does is chop off the Carrier and the other Side Band.
You have a choice of lower or upper sideband, but the less bandwidth you have, the more power you can put into that signal.
This is also more efficient.
Incidentally to recieve SSB you need either a reciever with a BFO (Beat Frequency Oscillator) inbuilt, or you can inductively couple one to a Shortwave reciever.
Hope this helps Scott!. [Linked Image]

[This message has been edited by Trumpy (edited 04-27-2006).]