I was QRT due to weather during this session but reports suggest that this session was an improvement over the previous. Solar and geomagnetic conditions appear to have recovered with quiet geomagnetic conditions and solar wind in the low speed category. The Bz was relatively consistent and mostly North-pointing.
Neil, W0YSE/7 / WG2XSV, reported that he would be operating a CW beacon on 475.4 kHz during daylight hours. Its unclear whether he received any reports. Later in the evening, Neil operated JT9 and had the following comments:
Neil also experienced what has become a typical session on WSPR2:
Doug, K4LY / WH2XZO, provided the following notes from the session. In a follow up email Doug noted that he failed to include continental US path to VK and JA in his propagation discussion with respect to less common paths.
Regional and continental WSPR breakdowns follow:
There were no reports from the trans-Atlantic or trans-African paths.
EA8/DL9XJ provided reports from the Canary Islands for EA5DOM and DK7FC.
Eden, ZF1EJ, and Roger, ZF1RC, were present for the session, providing reports from the Caribbean.
Laurence, KL7L / WE2XPQ, was not transmitting during this session but did provide reports for WH2XCR and WH2XXP.
In Hawaii, Merv, K9FD/KH6 / WH2XCR, reports extreme waves, some up to 55-foot tall, washing away roads and beach front properties. Merv also noted that a number of weather system are passing to his North. Are these events some how related to the propagation that was observed at WH2XCR last night?
John, VK2XGJ, reported that he saw a smudge where Merv’s signal should be located on his waterfall at 0815z. Merv was decoded for the first time just five minutes after John’s local sunset.
Phil, VK3ELV, received reports from TNUKJPM and WH2XCR.
Additional anecdotes, comments statistics and information:
Ken, K5DNL / WG2XXM, reported that he decoded eleven stations and was decoded by 50 unique stations.
Joseph, NU6O / WI2XBQ, is QRV once again with a new base insulator.
Toby, VE7CNF, reported a cross band JT9 QSO with N6SKM. 630-meters / 30-meters reports were at -8 dB S/N and -1 dB S/N, respectively.
Jim, W5EST, provided the following discussion entitled, “WHY 630M WINTER-SPRING US-VK IS RARE: VK, PNW RAIN SEASON”:
“This blog post is adapted and updated from a fall season post mortem dialog between John WG2XIQ KB5NJD and me.
Rainfall diagrams suggest why 630m winter-spring N.America-VK receptions are rare or absent. VK storm activity often occurs then in Queensland, New South Wales, and Victoria, along the path. NA storm activity is infrequent in SW US but rainy season is busy in Pacific Northwest (PNW). Consequently, the symmetry of sun and tilted earth that creates the same equinox-centered geometry of common darkness for February-April and August-October is mismatched with the storm asymmetry six months apart at each end of the wNA-seVK path.
John XIQ: It’s noisier at the end-of-summer listening side of the path compared to the winter listening side of the path.
Jim W5EST: Yes, I think that makes for an optimum or tradeoff in the propagation in the few weeks around equinoxes.
John XIQ: Tough to test without more high power guys more places in VK. But they have power limits whereas we can blaze away with the experimental licenses. One or more of 5w VK3ELV, 10w WE2XPQ, 1w WH2XCR, 10w WH2XGP, 5-10w WH2XND decode into JH1INM, JH3XCU, TNUKJPM, JA1NQI-2, 7L1RLL_4, JE1JDL, JA5FP.
VK-JA and HI/AK-JA paths are now proven. Take a look at 10 watt XGP and 5w VK3ELV, for instance:
2-13 11:00 WH2XGP 0.475692 -28 VK3ELV 13159
2-13 13:12 WH2XGP 0.475688 -29 VK2XGJ 12709
2-12 10:30 WH2XGP 0.475688 -29 VK2XGJ 12709
2-12 10:44 WH2XGP 0.475688 -28 VK2XGJ 12709
2-09 13:12 VK3ELV 0.475777 -28 KL7L 12333
Jim W5EST: In February-April favorable 630m NA-VK propagation should at least occasionally occur. Storms lower the seasonal probabilities compared to mid-August through September-October period we enjoyed. A lot more 630m activity than currently exists could prove it. I do think propagation tells why US-VK decodes cluster within a few weeks of equinoxes. Poor local summertime propagation kills the path in whichever hemisphere has summer.
John XIQ: More human nature than science. VK’s are historically less active on 630m during their spring. During our winter, they are in summer. Transitioning from NA winter to NA spring means VK summer to VK Fall. It’s a lot noisier there listening in NA spring than it is in NA fall.
Jim W5EST: As to the human nature side, yes, that makes sense. If nobody’s qrv or even receiving on 630m in VK, then there will be limited NA-VK activity. 630m VK stations are concentrated in se-VK. In NA also just a few 630m RX stations stretch from swUS-PNW-BC-AK focused on VK. It really helps that Merv WH2XCR is both transmitting and receiving to close some of the US-VK gap and increase VK and W/VE interest in NE/SW path.
Jim W5EST: How do US signals make it to VK as frequently as they do around NA fall equinox? 5-Ehop multihop seems too lossy even over salt water ocean. (12500km/2800km = 5-Ehop.). Even 4-Fhop multihop seems like a path loss stretch. (12500km/4000km = 4-Fhop.) Combination 5E/4F multihop addition? Skewing or ducting seem unlikely to bypass hops as frequently as the many nights we see decodes during the several weeks of August-October 630m NA-VK propagation.
To All: Let us know your NA-VK/ZL-JA ideas and experiences that weren’t covered here!”
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD <at> gmail dot (com)!