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Session started out looking OK then the noise set in; K4SV granted WI2XZB; W5EST presents ”Part 6: Make Sense of 630m SS/SR, 6-Month Seasonality, N/S Hemispheres”

– Posted in: 630 Meter Daily Reports, 630 Meters

The details for July 11, 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.

Noise was absolutely the worst I’ve heard it in a long time.  Propagation also appeared down but this is difficult to assess due to noise.  Long haul propagation was different but paths were open so its tough to say propagation was poor.  Operator activity was also relatively high for such an active storm night in North America.

11-hour North American lightning summary

 

Geomagnetic conditions were very erratic and while additional storm levels have not been achieved in the previous 24-hours, conditions remain at elevated-quiet to unsettled levels.  The Bz continues to be variable but has generally been observed pointing to the South.  Solar wind velocities are in the very high category, averaging near 610 km/s.  DST values continue at negative levels but have been relatively stable for the level of activity observed recently.  Solar X-rays were active during the day as well.  Overall propagation seems to have been impacted but its hard to say what the outcome is right now.

 

 

 

 

Dave, K4SV / WI2XZB, received his grant approval yesterday.

Murray, ZL1BPU, sent a series of messages detailing 630-meter activity in New Zealand.  I will include details over the coming days but referencing recent FSQ activity, Murray reports:

“I can report excellent reception by ZL2AFP (range 300km) over 24 hours. During daylight hours the signal is weak ground wave, but still 100%, SNR about -3dB (the mode copies to about -18), while at night there is considerable fading from the E layer but sigs are up to +20dB. Last night I also had reports from VK2XGJ, at around -5 to -10 dB.”

Neil, W0YSE/7 / WG2XSV, indicates additional WSPR activity for the session, particularly in the Pacific Northwest.  Neil was decoded by fifteen unique stations, all along the West coast of North America.  He added that “Terry, N6RY in DM13 was my outbound DX.”  He provided reports for six WSPR stations including WH2XXP and WG2XXM. Finally, Neil indicates that WSJTx v1.8 can be downloaded here.  This version includes FT8.

Ken, K5DNL / WG2XXM, started the session with a JT9 beacon which was easily copied here in North Texas well before sunset.  Starting WSPR later in the evening, Ken indicates that he decoded five WSPR stations and he was decoded by 29 unique stations including E51WL, ZF1EJ, and six Canadian stations.

WG2XXM at WG2XIQ pre-sunset

 

John, VE3EAR, reported the following JT9 reception reports for WG2XXM during a brief, 20-minute opening:

0328 -26  0.1 1302 @ VVV WG2XXM EM
0330 -26  0.1 1302 @ VVV WG2XXM EM
0336 -26  0.0 1302 @ VVV WG2XXM EM
0338 -24  0.2 1302 @ VVV WG2XXM EM
0340 -25  0.0 1302 @ VVV WG2XXM EM
0342 -26  0.1 1302 @ VVV WG2XXM EM
0344 -25  0.1 1302 @ VVV WG2XXM EM
0348 -25  0.1 1302 @ VVV WG2XXM EM

Roger, VE7VV, evaluated FSQ with Toby, VE7CNF, and provided these details and comments:

“VE7CNF and I tried FSQ last evening on 475.000 +1500 using FSQCall software at both ends. Toby’s 30W output was 100% print at all baud rates. He reported my 10W was 100% except for the fastest, 6 Baud speed which was about 70% and, when I shifted to 1W, print was about 30% at 4.5 and 2 Baud. The 4.5 Baud speed claims 40 wpm and -15 dB min S/N while the 6 Baud claims 60 wpm and min S/N of -13 dB. About 15 minutes after we finished, Toby decoded my 10W WSPR at -5, which gives an indication of the path S/N. FSQ uses a “texting” style where you type a msg which is not sent until you hit “return” at the end. We plan to do more tests during daylight groundwave to compare FSQ with other modes as a potential for emergency communication.”

Phil, VE3CIQ, reported constant lightning noise but he decoded 14MDA, WG2XXM, WH2XXC, WH2XXP, and WI2XQU.  He was decoded by N2BJW, VA2WW, and WH2XXC.  (Normally I would redact reports with mysterious call signs like 14MDA because we don’t really know who it is or where it is actually located.  Since its been around a long time and reported on multiple bands, I am going to include it today.)

Al, WD4AHB, reported a productive session for a Summer night.  He provided reports for six WSPR stations including  WH2XXC, WI2XQU, WH2XXP, ZF1EJ, WG2XIQ, and WG2XXM.  Al notes that “…the vertical blue line [on the map] going off-screen is a false decode.”

WD4AHB session WSPR activity (courtesy WD4AHB)

 

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

Roger, VK4YB, reported that he was leaving the northeast antenna active overnight, operating at 22% transmit cycle and low power.  He provided reports for WH2XXP and received reports from E51WL.

Ward, K7PO / WH2XXP, received reports from 35 unique stations including VK4YB, VK2XGJ, ZL1RS, and E51WL.  Ward added that he received 83 reports from E51WL over 8-hours at 30% transmit cycle.  His best report was -5 dB S/N.  He received five reports after sunrise in Arizona.

WH2XXP session WSPR activity (courtesy NI7J)

 

Rudy, N6LF / WD2XSH/20, provided reports for five WSPR stations and he received reports from 21 unique stations including ZL1RS.

Larry, W7IUV / WH2XGP, provided reports for seven WSPR stations and he received reports from 21 unique stations including ZL1RS.  As W7IUV, Larry provided reports for eight WSPR stations.

WH2XGP session WSPR activity (courtesy NI7J)

 

This was a miserable session to return to air for receiving.  After eleven days of off and on storms that the weather people could not seem to forecast with reasonable accuracy, the noise from surrounding regions and their storms was deafening.  Maybe I’m getting soft but this was about as bad as its been in a very long time.  I operated WSPR at low power and duty cycle and experienced a reasonable night under the circumstances, including receive.  It was not a night for skywave CW, unfortunately.  My WSPR transmission report details can be viewed here and my WSPR reception report details can be viewed here.

WG2XIQ 24-hour WSPR activity

 

Regional and continental WSPR breakdowns follow:

North American 24-hour WSPR activity

 

European 24-hour WSPR activity

 

Japanese 24-hour WSPR activity

 

Oceania 24-hour WSPR activity

 

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

E51WL 24-hour WSPR activity

 

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

ZF1EJ 24-hour WSPR activity

 

Laurence, KL7L / WE2XPQ, was off air for this session.

Merv, K9FD/KH6 / WH2XCR, was off air for this session.

Jim, W5EST, presents “ Part 6: Make Sense of 630m SS/SR, 6-Month Seasonality, N/S Hemispheres”:

Today’s illustration offers us a 630m-relevant tour of sunset SS and sunrise SR azimuths throughout the year.  The terminator provides a 630m radio frontal boundary oriented perpendicular to the sunrise azimuth of the sun’s rays. At sunset, the terminator provides another such radio frontal boundary oriented perpendicular to the sunset azimuth of the sun’s rays.  The last several days, I’ve portrayed various 630m SNR sequences representing these effects.

Comparing June solstice with December solstice, the first thing we notice is the remarkable amount of symmetry with respect to solar noon.  Indeed, every day of the year,and everywhere that SR and SS occur, the SR heading is as far east of North as the SS heading is west of North.  Generally on a given day, the terminator will sweep across a given radio path at different velocities at SR and SS.  Any day in the case of east-west (E-W) 630m paths, and only at equinoxes for all path orientations generally, the terminator will sweep across that radio path at equal velocities at SR and SS.

Second, NW-SE vs. SW-NE path orientations  present a distinct symmetry.  At a given location any day of the year, whichever of a NW-SE path or SW-NE path experiences the higher terminator speed at sunrise SR will experience the slower terminator speed of the two paths at sunset SS.  Which path direction has faster or slower terminator speed at SR may depend on the date.

Third, we see symmetry between the day length at a given latitude L° North and the equal night length in the southern hemisphere regardless of longitude at the same latitude number L° South.   Sunrise SR at each pair of corresponding latitudes L° N. and L° S in Northern and Southern Hemisphere occurs at the same sunrise SR azimuth on a given day, and likewise these opposite latitudes share the same sunset SS azimuth.

Fourth, a subtle symmetry provides that SR azimuth east of north in both hemispheres is the same as the SS azimuth west of south in both hemispheres six months before or six months later.  The illustration emphasizes solstices to suggest the furthest azimuth positions, but this six-month symmetry as between SR and SS azimuths applies for any pair of dates a half year apart.  From a 630m viewpoint, as between SR on a given date compared  with SS on another date a half a year away, the terminator sweeps across the radio path and its relevant ionosphere with same orientation and velocity on both dates.

Symmetry of 630m SNR dynamics results from the SR/SS six-month symmetry. On each of dates 6 months apart, the terminator is doing the same thing except the sun’s rays are directed at the ionosphere in precisely opposite directions at SR on one date and SS six months earlier or later.  Since a given SR or SS azimuth is the same at equal-numbered latitudes N. and S., the 6-month symmetry applies across hemispheres as well.

Deep stuff—and remarkably it affects 630m and 2200m.  TU & GL!” 

 

 


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