HF Radio propagation measurements

Near real-time results of measurements of radio signals from chirp sounders in the short wave spectrum, as received by PA0DLO in Veldhoven, The Netherlands (51.4 N, 5.4 E).
Delay times of radio signals, refracted by ionospheric layers, are measured and plotted.

Note: Only when the measurement system is online, the data on this page is automatically updated every 5 minutes.

On this plot the most recent ionogram of one chirp sounder is shown. The horizontal axis is the frequency (MHz) and the vertical axis is the delay time of the received radio signals in milliseconds.

IONOGRAM
Rucphen, Netherlands (51.51 N, 4.52 E)
Chirptime set to: 116.405 s
Period: 900 s

Note: This sounder sweeps at 50 kHz/s, as opposed to the usual 100 kHz/s. Therefore the frequency numbers, indicated at the horizontal axis, must be divided by 2 to get the actual frequency.

Useful links to other near real-time data

Ionogram of Digisonde vertical sounder at Dourbes, Belgium (50.1 N, 4.6 E)
Ionogram of Digisonde vertical sounder at Juliusruh, Germany (54.6 N, 13.4 E)
Ionogram of Digisonde vertical sounder at Pruhonice, Czech Republic (50.0 N, 14.6 E)
Ionogram of Digisonde vertical sounder at Roquetes, Spain (40.8 N, 0.5 E)
Sporadic E reflections over Europe (PE1ITR)
Sporadic E reflections over Europe (G7IZU)

For further information on the reception of chirp sounders see the G3PLX Chirp Project.