Total posts : 45366
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
