FM stereo multiplex signal with FUNcube Pro+ AMSAT SDR receiver
FM broadcast multiplex (MPX) signal received with the AMSAT SDR plus dongle.
The following signals can be seen from left to right in the bottom graph:
1) 0 - 15 kHz LF signal (Left + Right signal)
2) 19 kHz pilot signal
3) 23 KHz to 53 KHz Left - Right sidebands (differential signal) with at 38 kHz a DSB-SC
(double-sideband suppressed-carrier)
4) RDS (radio data system) 57 kHz sub-carrier