Great, I will do a testsetup on the weekend! Thank
I found this graphic: http://www.radioradar.net/files/Image/a ... c/ris1.gif
"The Soviet system (OIRT in the diagram) transmits the L-R on a double-sideband AM subcarrier centered at 31.25kHz. The 31.25kHz carrier is at a reduced level (one could think of the subcarrier as being suppressed-carrier AM with a low-level pilot tone re-inserted at the carrier frequency, instead of 1/2 the carrier frequency)."
For me it seems to be as followed:
E.g. One Stereo 1 kHz Tone beeing out of phase modulated at 100% should generate 100% modulation in the Stereo AM Part. In this case the 31,25 kHz would normally be as high as the 1kHz tone. Now the carrier is reduced by 14dB but the audio information is as high as before. In the picture it seems that around the carrier there is also a kind of notch filter. Perhaps this is meant by the K-Function?