Noise continues in the south and south eastern portion of the US, impacting stations into New England. The impact was less pronounced in the Pacific Northwest were Larry, W7IUV / WH2XGP, reported eight stations and noted that the path to WE2XPQ in Alaska was improved.
John, WA3ETD / WG2XKA, submitted the following session report from Vermont:
Regional and continental WSPR breakdowns follow:
There were no reports from the trans-African path. UA0SNV was present from Asiatic Russia but had no reports in the WSPRnet database.
A single trans-Atlantic decode of DK7FC was provided by WE2XGR/3.
Eden, ZF1EJ, and Roger, ZF1RC, had storms between their location and the bulk of stations on the air in North America.
In Alaska, Laurence, KL7L / WE2XPQ, was transmitting again, being reported down the West coast of North America and Hawaii. KL7L was active as receive-only once again.
In the Pacific, Merv, K9FD/KH6 / WH2XCR, received reports from Alaska, Japan and Australia, including two-way reports with VK4YB. Merv indicates that more extreme tidal activity is expected for the next two days. He also has some antenna work in the planning phases as he begins to source local materials for the project. We sometimes take for granted just how difficult something as simple as an antenna project can be on a remote island location. Big box home improvement stores have spoiled me.
Phil, VK3ELV, received reports from JH1INM, JH3XCU, and WH2XCR:
Additional anecdotes, comments, reports and statistics:
Jim, W5EST, provided an analysis of recent JT9 data from stations in the Pacific Northwest:
“Today’s report follows up John XIQ blogging the 630m decodes of John VE7BDQ, Toby VE7CNF & Joe WI2XBQ into Neil WG2XSV yesterday Feb. 23. As you know, the Feb. 12 blog reported on the reverse JT9 path WG2XSV-ve7cnf. My Feb. 12 scatterplot illustrated the roller-coaster WG2XSV-ve7cnf JT9 SNRs (9hr, 265 points) over a 399km short northbound sky-wave path featuring SIQ*=7dB.
For Feb. 23, the JT9 SNR sequence gives us a peek at the southbound path on a clear night from B.C. to southern Washington state. The SIQ in reverse direction from both VE7’s was 6 and 8 dB—within one dB of the path in the reverse direction. The scatterplot for VE7BDQ Feb. 23 is omitted since it is a featureless band -5 to -20dB due to few number of 6 points per hour spread over ~6 hours.
630m single-hop Feb. 23 was behaving normally and well enough for JT9 reception over the ~6 hours. Probably some ground wave insignificantly mixed with the single-hop sky wave on the VE7-xsv paths too.
I say “insignificantly mixed” because I speculate that mostly only shorter paths 200-300km are the ones that get 630m 24-hour ground wave and 630m nighttime sky wave similar enough in strength to interfere significantly.
If much closer, then ground wave predominates. If much farther, then sky wave predominates. The short path distance range featuring ground/sky wave interference will shorten as sky wave returns strengthen, but will lengthen as sky wave returns weaken over a night. Maybe you know better. Please let us know and give some data from your experience if possible. See graph in Feb. 6 blog for combining dB.
SNR distributions: VE7BDQ-xsv has a relatively uniform SNR distribution across a 16 dB range from -5 to -21dB. VE7CNF-xsv has a SNR distribution ranging 17dB over -1 to -18dB that more nearly approaches the expected bell-shape probably due to higher number of SNRs overcoming the effects of statistical fluctuation.
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD <at> gmail dot (com)!