WWV Ionospheric Scientific Modulation Test | Signal Phantom

7 hr reveal of propagation tests on special announcement block Minute 8 (WWV) and 48 (WWVH) that will occur on November 15th 2021. The signal is a joint effort with NIST; the WWV/H Scientific Modulation Working Group and HAMsci. Recorded by Tyler Stampfli, KA0KA in Fort Collins, Colorado For more samples see ‪@SignalPhantom‬ recorded for SignalPhantom.com

Signal consists of the following:
-Gaussian white noise (2 seconds).
-One second blank time.
-Phase-coherent 2, 3, 4, 5 kHz sine waves that drop down by 3 dB 9 times, 10 seconds total.
-One second blank time.
-An eight-second sequence consisting of linear up-chirps and down-chirps, generated 5 kHz over 1 second, sweep duration 0.05 seconds 3 short up, 3 short down at 6.66Hz.
.5 seconds blank.
3 long up, 3 long down sweep duration 1 sec. 100 ms between chirps and at the end of each sub-sequence at .909Hz.
-2 seconds blank time.
-A one-cycle burst at 2.5 kHz frequency, for time domain measurement, repeated 5 times over the course of 1 second; then the same for 5 kHz.
-One second blank time.
-Repeated 2 seconds of Gaussian white noise for synchronization.
-3 seconds blank time