Think it could extend part 15 coverage as it does on full power? Just curious....
Maybe, but what is it?
Leonard Kahn developed one of the competing systems for AM Stereo... it was superior to all others, but lost...
Later in his career, as a method to save AM, he developed the Powerside....
http://www.broadcastengineering.info/viewtopic.php?f=2&t=3124
Here's a good link....
http://www.rwonline.com/article/commentary-power-side-tops-fla-engineer39s-list/16279
The PowerSide system can aid in reaching a consistent positive peak which would help 219 systems for sure. For 221 systems (Carrier Current) it is really not needed as a CC system isn't trying to push for radiation field (far field) coverage. In fact it might make the system go outside of the 157/f 15uV @ 30 meter limitation. But with proper calibration and setup and maintenance it would aid in the station's perceived loudness as well as aid with positive and negative peak control. If combined with an asymmetrical processor and carefully adjusted would produce a very loud and powerful sound on the station.
However the PowerSide system and/or/combined asymmetrical processing will dampen C-QUAM performance because the 90* envelope lobes (L-R information) must maintain a specific amplitude
and correct phase to the main envelope lobe (L+R), otherwise the stereo separation becomes unstable and a panning effect or narrowing effect of the stereo field results even with the removal of NRSC curve specifications and even worse if the NRSC curve is applied. The -80db "pyramid", as I call it, will seriously cut off the two side bands which C-QUAM must have at least an 8Khz window to have decent L-R separation with the main L+R envelope. With the 4.5Khz window pyramid applied, it literally chokes off a C-QUAM signal, and is highly noticed when using a full 10Khz bandwidth IF AM C-QUAM receiver or modulation monitor when switching in and out the NRSC filter.
Both the NRSC filter and PowerSide systems are really intended to overcome typical narrow IF bandwidth AM receivers and noise by what I consider as "brute force" of attempting to compensate for poor AM receiver designs.
RFB
in the library located here
http://krocksradioone.com/forum/index.php/topic,77.0.html
there is a design for an ISB Exciter
The system isn't entirely 100 percent compatible with receivers as the PowerSide system favors one sideband over the other. Some receivers won't see the envelope correctly and end up sounding very distorted when tuned to a PowerSide signal.
Again it all goes back to the receiver manufacturers and their for no good reason to make AM receivers so frigging cheap thus creating this incompatible nonsense through and through, be it for Kahn's PowerSide format, or his AM stereo format, or even for standard mono hi-fidelity reception with the use of very very cheap IF ceramic filters. Even in the 80's ceramic filters were cheap enough to make AM receivers as good as they should have been.
Problem Kahn had with his AM stereo system, as was the same with the Belar system was both used a combination of FM and AM modulation and were not 100 percent compatible with existing mono receivers. The only two (after the Magnavox FCC Foobar) were the Motorola C-QUAM and Harris V-CPM systems that were compatible with mono receivers.
RFB
You sir are a genius. I am so glad to have access to your wisdom!