The details for May 9, 2016 can be viewed here.
IMPORTANT REMINDER: Neither 630-meters nor 2200-meters are open to amateurs in the US yet. Please continue to be patient and let the FCC finish their processes.
As reported yesterday, John, WA3ETD / WG2XKA, of MF Solutions will soon hold a drawing and giveaway for one of his 630-meter transmit downconverters. Details and rules for submitting your name for consideration can be viewed here. Registration ends May 12 and the drawing will be May 13!
Storms in the West and Midwest increased QRN levels a bit but few stations reported problems. Domestic openings were average for the session and there were several new reporting stations observed.
Geomagnetic activity was quiet with a neutral Bz this morning and solar wind velocities averaging 372 km/s and largely unchanged from yesterday. DST values were a bit more divergent between the northern and southern hemispheres with more hopeful values from Kyoto compared to the Australian values.
Al, K2BLA / WI2XBV, indicated relatively low QRN in Florida with reports for seven WSPR stations. He received reports from nineteen unique stations including VE7SL and WH2XCR after one hour of activity this morning.
Neil, W0YSE/7 / WG2XSV, reported interesting daytime openings. As it turns out, Rudy moved his receive antenna, contributing to these differences. Neil explains:
“…Rudy, at a distance of 155 miles, was able to copy my wspr at CW levels from about local noon (17:18 UTC) until after 4 pm PDT (21:12 UTC).
I was away from the house (i.e. no TXing) for the next 2.5 hours, and when I got back on the air things had changed. (see the gap in the reception reports). I believe there might be some sky wave interaction today, long before sunset…”
This morning Neil reported his overnight activity:
Dave, N4DB, provided reports for nine WPSR stations after five hours of listening.
Trans-Pacific report details, excluding KL7 and KH6, can be viewed here.
Roger, VK4YB, reported that “The band has shifted again, favouring Japan. Very long opening which still continues as I write. Congrats to Steph, VK5FQ and Kiyo, JR1IZM.” Roger received reports from 7L1RLL4, JA1NQI, JA3TVF, JE1JDL, JH3XCU, JR1IZM, VE7SL, W7IUV, WD2XSH/20, WE2XPQ, and WH2XCR. He provide reports for WH2XCR, WH2XXP and WH2XGP.
Steph, VK5FQ, received reports from JR1IZM.
Ken, K5DNL / WG2XXM, reported that he decoded six WSPR stations and he was decoded by 44 unique stations including ZL2AFP, WH2XCR, WE2XPQ, ZF1EJ “and five VE stations”.
Ward, K7PO / WH2XXP, received reports from 45 unique stations including VK4YB, VK2XGJ and ZL2AFP.
Larry, W7IUV / WH2XGP, provided reports for eight WSPR stations and he was reported by 34 unique stations including VK4YB and ZL2AFP. As W7IUV, Larry provided reports for nine WSPR stations including VK4YB.
Band conditions were noisier than the previous session here in North Texas but domestic WSPR openings were solid. Two-way reports returned for WH2XCR but may be the result of my listening later in the morning than I have been in several months. Merv often peaks later this time of year. I operated at 17% duty cycle overnight and noted numerous CW and JT-9 level reports overnight. My transmission report details can be viewed here and my reception report details can be viewed here.
Regional and continental WSPR breakdowns follow:
Eden, ZF1EJ, returned to transmitting during this session. He provided reports for eight WSPR stations and he was reported by 23 unique stations including WH2XCR.
Laurence, KL7L / WE2XPQ, experienced a rebound session, calling it ‘fair’ and providing a report for VK4YB. Laurence also shared two-way reports with WH2XCR. Reports were generally limited to the West coast in addition to reports of WG2XXM in Oklahoma. Laurence indicated that “XXM made the distance and underground dog fence QRM ‘howler’ apparently QRT overnight.” DX report details can be viewed here.
Merv, K9FD/KH6 / WH2XCR, provided reports for VK5FQ and ZF1EJ and shared two-way reports with VK4YB and WE2XPQ. Merv received reports from VK2EIK, VK2XGJ and ZL2AFP. There were several reports from ZL2AFP near sunrise before the band tilted back to VK where VK4YB was decoded after sunrise in Hawaii. In the East, Merv provided reports for WI2XBV. DX report details can be viewed here.
Jim, W5EST, presents, “PART 4: 630M RF FOCUSING BY AUGUST 21, 2017, SOLAR ECLIPSE?”:
Yesterday’s blog post illustrated the bull’s-eye shaped darkness of the solar eclipse. I imagined a probable saucer-shaped thinning of the E-region around the oval of totality. (Endnote 1*)Given the curvature of that saucer, could the eclipse even focus 630m RF and greatly increase eclipse-enhanced SNR by such RF focusing? Think of a concentrating mirror or an elliptical acoustic reflection gallery: http://hyperphysics.phy-astr.gsu.edu/hbase/Acoustic/reflc.html (scroll 40%).Today’s illustration shows the eclipse bull’s-eye. Quite a few of the USA 630m experimental TX stations and W/VE RX stations define paths that asymmetrically bridge the eclipse bull’s-eye at some point on the eclipse track. Presumably it is there that SNRs can be most favorable. There, 630m signal rays will traverse the D layer in its least-absorbing eclipsed places (white circles). Moreover, multiple 630 m signal rays may even reflect (red circles) from the underside of the eclipse’s E-region “saucer.” (Endnote 2**)The upper left of the illustration shows a profile of the D & E regions above the earth beneath. Up through the D-region from TX1 go multiple signal rays that potentially can reflect from the underside of the eclipse saucer and descend to RX2 via the eclipse-darkened D-region.During the 1999 eclipse pass across Europe, hams measured 75 KHz LF Swiss time station HBG75. https://misan.home.xs4all.nl/eclipse.htm Because of the geographic position of 2015’s eclipse pass NE in the North Atlantic, hams had no opportunity to test 630m RF signal paths that could cross that eclipse bull’s-eye. Can our 630m efforts in 2017 accomplish this? TU & GL!
*ENDNOTE 1: For background on the August 21 solar eclipse and 630m, see these blog posts:
http://njdtechnologies.net/050817/ ; http://njdtechnologies.net/050417/ ; http://njdtechnologies.net/050517/
Inspiration for today’s blog post came from the focusing mirror concept that Markus DF6NM posed. https://uk.groups.yahoo.com/neo/groups/rsgb_lf_group/conversations/topics/4665 (Scroll 1/3 ff.). Change 75 KHz D-region mirror focusing concept to E-region mirror focusing on 630m.
**ENDNOTE 2: A football-shaped prolate spheroid (ellipsoid of revolution) provides a key geometric concept here. https://en.wikipedia.org/wiki/Spheroid A prolate spheroid defines all points of reflection in the ionosphere where all RF signal paths from TX to RX have a same particular electrical length. The major axis of the spheroid includes the TX and RX as its focus points. An RF reflection point for a path of that one electrical length lies on the surface of the spheroid. That surface comprehends all the possibilities of vertical and lateral skew.
Like layers of an onion, spheroids of other sizes define all points where RF signal paths of other particular electrical lengths might have their points of reflection to connect TX to RX. However, if a solar eclipse produces an oval-shaped upside down saucer of reflective surface in the E-region as I believe it does, that reflective saucer surface will only complete RF signal paths between TX and RX where the saucer surface is tangent to one of the onion-layer spheroids. Surface complexity of the dynamically created E-region saucer surface may also contribute multiple reflections on the fly, see http://njdtechnologies.net/040417/
If solar eclipse totality were centered on the RF mid-path point, multiple RF signal rays might connect TX and RX as shown here: https://www.researchgate.net/figure/275887083_fig4_Fig-7-Schematic-of-focusing-by-elliptical-mirror-M1 . However, our 630m RF signal paths are unlikely to have their mid-path point in the middle of totality. Instead, any multiple reflections from the eclipse saucer will likely occur on the side of the saucer closest to one end of the RF signal path as in today’s illustration.
The orientation and the exact shape of the saucer will depend on the sun’s elevation angle and azimuth at about the time of day the solar eclipse track crosses the RF signal path(s) as illustrated. In general, if multiple RF paths from TX to RX can be completed by solar eclipse-altered E- region, they will very likely have different lengths and the multiple RF signal returns will phase-combine at RX.
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD gmail dot (com).