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Decent activity but generally flat propagation for parts of North America as QRN moderated by morning; W5EST presents ”Part 8: Draw Regional 630m Paths on SR/SS Azimuth Diagrams”

– Posted in: 630 Meter Daily Reports, 630 Meters

The details for July 13, 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.  UPDATED: Click here to view the proposed “considerate operators” frequency usage guide for 630-meters under Part-97 rules that was developed with the input of active band users.

My impressions of the session from a receiving perspective was that propagation was average to below average at best but typical for July.  A few stations in the West were a bit more optimistic.  Noise conditions were active during the evening but improved significantly by morning but many paths that should have developed did not.  It wasn’t a bad night.  It was simply “July” in North America.

11-hour North American lightning summary

 

Geomagnetic conditions were quiet to very quiet.  The Bz continues to point slightly to the South as solar wind velocities moderate, averaging near 400 km/s but this value is generally trending downward.  DST values are riding the center line again and trending  to positive values.  Solarham indicates that a small threat of an M-class flare is possible over the next 24-hours.

 

 

 

Ken, K5DNL / WG2XXM, reported that he decoded four WSPR stations and he received reports from 35 unique stations including WE2XPQ, E51WL, WH2XCR, ZF1EJ, and four Canadian stations.

Neil, W0YSE/7 / WG2XSV, reported a better night in the Pacific Northwest.  He explains:

“A bit of improvement overnight as I was heard by 17 stations including XCR, and 2-way decodes with XPQ in Alaska !!!

I was able to hear these 6: WD2XSH/20, WD2XSH/26, WE2XPQ, WG2XXM, WH2XGP, WH2XXP

I also did some FT8 beaconing (intermittently) between 7 and 10 PM and was decoded at  -13 dB by Dick, wd2xsh/26, who is 327 km north of me. He did not try transmitting in FT8 however. We may try a QSO soon.”

Trans-Pacific report details, excluding E51, KL7, and KH6, can be viewed here.

Ward, K7PO / WH2XXP, received reports from 38 unique stations including ZL2AFP, VK4YB, and VK2XGJ.

WH2XXP session WSPR activity (courtesy NI7J)

 

Larry, W7IUV / WH2XGP, provided reports for four WSPR stations and he received reports from 23 unique stations including ZL2AFP.  As W7IUV, Larry provided reports for six unique stations.

WH2XGP session WSPR activity (courtesy NI7J)

 

KPH was booming in on 8 MHz and copying their messages early in the session kept me occupied until near dark.  I started the MF session after dark, testing a few things around the shack after moving some cables.  Starting at 0214z, I called CQ on 474.5 kHz CW while performing some listening tests in between transmissions.  Noise rejection was nominal and my initial test was successful.  At 0306Z I began listening on WSPR, making a few adjustments as I listened East and West on the K9AY loop.  Directivity was good and signals were strong enough.  I set the direction for ‘West’ overnight and experienced relatively good results by morning.  I switched directions just prior to shutting down this morning providing a few decodes for eastern stations which had been neglected overnight.  I will perform more receive tests on nights that I can identify as “OK” propagation.  My WSPR reception reports can be viewed here.

WG2XIQ 24-hour WSPR activity

 

Regional and continental WSPR breakdowns:

North American 24-hour WSPR activity

 

European 24-hour WSPR activity

 

Japanese 24-hour WSPR activity

 

Oceania 24-hour WSPR activity

 

Eden, ZF1EJ, provided reports for three WSPR stations and he received reports from five unique stations.

ZF1EJ 24-hour WSPR activity

 

Warwick, E51WL, provided reports for six WSPR stations.  Report details can be viewed here.

E51WL 24-hour WSPR activity

 

Laurence, KL7L / WE2XPQ, reports that overnight conditions are a bit darker as the Summer progresses.  He provided reports for five WSPR stations and received reports from nine unique stations as he strings together a second consecutive good night.

WE2XPQ 24-hour WSPR activity

 

Merv, K9FD/KH6 / WH2XCR, provided reports for VK3HP and he shared two-way reports with VK4YB and WE2XPQ.  He received reports from E51WL, VK2XGJ, VK5ABN and ZL2AFP.  DX report details can be viewed here.

WH2XCR 24-hour WSPR activity

 

Jim, W5EST, presents “ Part 8: Draw Regional 630m Paths on SR/SS Azimuth Diagrams”:

“Four pairs of binary opposites interrelate when the terminator goes overhead:

SNR Ramp:       Longer / Shorter              (seasonally speaking.  SS-SS or SR-SR interval.)

Signal Path:       SW-NE / SE-NW             (or some intermediate direction near E-W or N-S)

Sun:                    Sunrise SR / Sunset SS    (except 24 hr. days in polar latitudes)

Month:               June / December               (and months near them)

You can easily keep track of the interrelationships by drawing a 630m path that interests you on the SR/SS azimuth chart, as in today’s illustration.

Then simply read from the diagram. You can determine any one binary condition from the other three, or any two binary conditions from the other two, or any three of them from a given one.  Consider these question examples among many other question possibilities.

Q1: What direction of path will have a seasonally long SNR ramp at SR in December?

A1:  On the December azimuth circle at SR, the SE-NW path most nearly aligns with the SR line, so the answer is SE-NW (or NW-SE).

Q2:  What path direction and time of year give a seasonally longer-duration SNR ramp at sunset SS?

A2:  Look for path directions that align with sunset on the circle.  NW-SE around June and SW-NE around December fit the bill.

Q3:   How will paths behave in June or thereabouts?

A3:  At SR, paths NE-SW will have long SNR ramp and paths SE-NW will have shorter SNR ramp.  At SS, paths NE-SW will have short SNR ramp and paths SE-NW will have longer SNR ramp.

Q4: How will a given path you may care about behave throughout the year?  As instances, I’ve drawn the 303° WH2XXP-n6skm path (in red) on all three SR/SS azimuth circles—for June, for equinoxes, and for December—and likewise for the 193° VK4YB-vk2xgj path (in purple).  I positioned  the paths nearest the SR or SS line to which each one most nearly aligns and proceed to answer simply by reading what the circles show.

A4: XXP-n6skm will have its longer duration SNR ramps at SS around June and SR around December—longest SR in November and January, longest SS in May and July.

VK4YB-vk2xgj doesn’t align very well with SR or SS any time of year.  The longest, slowest ramps will be at solstices.  The shortest, fastest ramps will happen for SS in April and July and for SR in October and latter part of August.

Q5:  For the two paths, when will the SNR at SR or SS likely be greatest during the year?

A5:  This question implies not only path alignment with the sun azimuth, but also that sun elevation will be low. Low sun elevation means fall/winter months–the months of short daytime in the applicable hemisphere on the diagram.    Because XXP-n6skm path is in N. Hemisphere, fall-winter there means December and neighboring months.  That path aligns with SR in November and January, so that’s when the SNR is likely to be greatest as sun crosses horizon at XXP.

Because VK4YB-vk2xgj path is in S. Hemisphere, its fall-winter is around June (say mid-May to mid-July).  That Brisbane-Sydney path aligns better with SR than with SS at the June 20 solstice. As sun crosses horizon at VK4YB, it’s SR sunrise SNR that’s likely to be greatest for this path.   Pre-SR enhancement may occur and outperform sunrise SNR itself.

Exceptions to the diagram-based predictions will no doubt occur on the 630m mystery band, and if you encounter a  persistent exception, let us know so we can blog it.  TU & GL!”


Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD gmail dot (com)!