HF Solar Cycle 25 Band Scan


In previous posts (Ref.1/Ref.2) I looked at using WWV and the NCDXF beacons as a quick guide to assessing the existing propagation conditions. Yesterday it suddenly warmed up, so I had to get out on my newly rebuilt balcony and do a quick HF propagation test. I scanned for WWV and the NCDXF beacons using SDR# and the RTL-SDR with 125MHz upconverter.

HF Reception Results

Station FrequencyRelative Rx Power
WWV 2.5MHz-85dBFS noise level
WWV 5.0MHz-85dBFS noise level
Fig.1 HF Quick Band Scan

Figure 1 shows a table of reception results. WWV came through very well on 15MHz and 20MHz, weakly on 10MHz and not at all on 2.5 & 5MHz. The only NCDXF beacon I was able to receive was NewYork 4U1UN at 14.1MHz which came in very well. Figures 2/3/4 show the received spectrum and Figures 5/6 the VOACAP propagation wheel for my location to WWV and NewYork.

Fig.7 4U1UN Rx 14.1MHz
Fig.8 YouTube Video HF Cycle 25 Band Scan

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#1. – “RTL-SDR for HF WWV Propagation”

#2. – “RTL-SDR for HF Beacons Propagation Predictions”

#3. – “Major Solar Cycle 25 Geomagnetic Storm”, June 2023 ARRL QST Magazine

#4. – “Experience the Wonders of Solar Cycle 25’s Solar Maximum”, May 2023 ARRL QST Magazine

By Jeremy Clark

Jeremy Clark is a Senior Telecommunications Engineer and Advanced Amateur Radio Operator VE3PKC. He is the author of E-Books on Telecommunications, Navigation & Electronics.