If one looked at the lightning map or weather radar, they might draw the conclusion that this was going to be a very poor session. While some operators were less fortunate than others during this session, at my stations here in Texas the band was very good. Numerous stations consistently reported CW levels while other reports would have easily fallen into the JT9 range. It was a nice surprised where I found twice as many reports compared to the previous session. It was also nice to be able to complete my morning CW sked this morning with XIQ/1 after a weekend away and some stormy weather during the previous session.
Geomagnetic activity was quiet with a slightly south-pointing Bz and moderate solar wind velocities above 400 km/s. DST values were variable in the southern hemisphere while the Kyoto DST stabilized into persistent positive territory for the first time in recent memory.
John, VK2XGJ, reported that WH2XCR was being consistently reported starting one half hour after local sunset in Australia:
Steve, VE7SL, reports some improvements through the session with an open transcontinental path to VE3CIQ, where Phil decoded Steve three times. Steve also reports that he decoded six WSPR stations and was decoded by nine unique stations.
Phil, VE3CIQ, reports a good receive session in Ontario where he decoded VE7SL, WE2XGR/3, WG2XIQ, WH2XGP and WH2XZO. Phil’s signal was regionally decoded by AE2EA, WA3TTS, WA3TTS/2, WE2XGR/3, and WI2XFI.
Doug, K4LY / WH2XZO, reports that he is operating with a new (used, new to him) power supply that is much quieter than his previous supply and more reliable than the name brand supply that was not up to the challenge and subsequently failed twice. Doug generally did well here overnight and was he was also hearing very well.
John, W1TAG / WE2XGR/3, reported that he was QRV from Maine, operating on his mobile (portable) grant. After some matching network upgrades, John reports that he was able to operate at 150-watt TPO and experienced some nice results overnight.
KC1ANM was reported as a new listening station on WSPR.
Neil, W0YSE/7 / WG2XSV, reports that he is still banging right along and made some improvements to his amp. I second his comments on Rog’s design. It’s outstanding:
Regional and continental WSPR breakdowns follow:
There were no reports from the trans-Atlantic or trans-African paths during this session.
In the Caribbean, Eden, ZF1EJ, reported WH2XZO and WG2XIQ:
Laurence, KL7L / WE2XPQ, reports poor conditions while he operated JT9 through the early portion of the session as his system testing continues. WSPR reports were also observed from Laurence’s stations after 1100z. Laurence notes concerns about a neighbor who is planning on installing dimable LED lighting. Its my understanding that they are more problematic than standard LED’s. I’ve never had a problem with standard LED’s here at my station:
Merv, K9FD/KH6 / WH2XCR, received post-sunrise reports from VK4YB as the culmination of a really nice session that started with early, pre-darkness reports from VK2XGJ, as previously reported:
Jim, W5EST, will present periodic commentaries and discussions this summer and offers this one today, entitled, “INTERPRET DAYTIME 630M WEATHER NOISE ON YOUR WATERFALL DISPLAY”:
“The strength and average rate of lightning events can vary considerably on a 1 second to 1 minute timescale in the daytime especially. I think the static event strength indicates the nearness of the event, and the average rate indicates the extensiveness of the storm system.
Example: Omnidirectional antenna, Little Rock, AR. 6/13/16 1923z: Ltng 10dB/n 2sec average spacing, 20dB/n 15sec avg spacing. Often the distribution is more uniform, but not this afternoon. The separated stats suggest one system near, one system far. Storm Doppler geographically indicated Tstorms ETX-LA-AR, WY-NM, rain MI-NY, ME. I’d nominate the small system in Arkansas for the strong waterfall lines, and the large system in Louisiana for the weak ones.
The screenshot shows the G33DDC SDR waterfall 2009z and a Doppler rendition 1938z. The near system is visible on Doppler in north central Arkansas while the far system is situated in southern Arkansas and Louisiana. Stronger (redder) horizontal lines occur only occasionally while numerous fainter light blue lines every second or two populate the dark blue noise background.
Low strength is 0-9dB over noise (dB/n), Medium: 10-19 dB/n, Strong: 20+dB/n. Low average rate per 10 seconds is less than 1.0. Medium: 1-4. High: 5+, one event every two seconds or faster. Near means 0-100km. Medium: 100-200km, Far: over ~200km.
Since my antenna is most likely omnidirectional, several small storm cells at similar medium distances at widely spaced headings could add their rates together. Numerous geometric possibilities probably mean that the TABLE could be more nuanced and considerably improved over the one I’ve assembled on the fly here.
One could imagine a graph of Rate-Per-10sec on Y-axis versus an X-axis quantity formed from 50dB minus the dB/noise event level. That would form a distribution roughly representing storm size Y versus storm distance X. Such a graph is just a rough-and-ready construction, but it helps one think about the way storms “look” to the 630m antenna.
Earlier this year, this blog posted station lightning protection concepts March 12-14, lightning parameters March 15, and segmented lightning lines on the waterfall March 16.
If you see a better way of interpreting storm static lines from a waterfall, feel free to contribute from your experience!”
TABLE: INTERPRETING DAYTIME STORM STATIC ON 630M
Strength (dB/n) Average rate per 10 sec Interpretation
High/Low Low/High Small system near, large system far
High/Med/Low All high Large system near
High/Low High/Low Large system near, small system far
Med/Low Low/High Large system medium distance
Low Low Small system far
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD gmail dot (com)!