Hi, So the payload length will be based on HT20 vs HT40, but also the spectral scan FFT config. You can specify how many samples to take each time and whether to gather them "short" or "not short" time interval. So fiddle around with the number of samples in the FFT config and you'll see different sized payloads. Since Felix has just posted the spectral scan FFT format, we may as well post the radar FFT format. :) Adrian -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html