John and LF, what the ICM products look like in a spectrogram of course depends on the FFT resolution. The narrow events were created by test tone modulation on the broadcast transmitter (probably 22
.. this is the cross modulation signature on the RN3AGC grabber. The pattern was also visible on F1AFJ's screen. - 73, Markus The band is fairly quiet tonight. Twice for a few minutes around 23:23 an