NJDTechnologies

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Probably QRT tonight and in the morning due to storms in the area

ZL2BCG -> VE6XH on a weird night of very limited trans-Pacific openings; W5EST presents ”WE2XPQ Reports 620 KHz Ground Wave Seasonality on 100 Mile Alaska Path”

– Posted in: 630 Meter Daily Reports, 630 Meters

The details for July 19, 2016 can be viewed here.

IMPORTANT REMINDER: Neither 630-meters nor 2200-meters are open to amateurs in the US yet.  That includes stations using fake or pirated call signs.  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.

Storms and the subsequent noise distributions were mostly the same as monsoon season brings strong weather to the Desert Southwest while storms in the Midwest and Southeast moderated by morning.  A few storms in the North central and central US continued this morning.  Evening noise conditions were manageable and like the previous session, lighting strikes were far enough apart to not really interfere with listening.

11-hour North American lightning summary

 

Geomagnetic conditions have returned to quiet levels for extended reporting periods following recent storm conditions.  The Bz is currently pointing to the North and solar wind velocities are creeping closer to low levels, averaging near 405 km/s with a few excursions below 400 km/s.  DST values are improving but remain at disturbed levels.  This storm was strong so it will take a few days for things to return to normal.  Solarham indicates that widespread aurora should not be an issue tonight.

 

 

 

Ken, K5DNL / WG2XXM, reported that he decoded three WSPR stations and he was decoded by 34 unique stations including E51WL, WH2XCR, ZF1EJ, and five Canadian stations.

Neil, W0YSE/7 / WG2XSV, reported that conditions were similar to yesterday.  He decoded six WSPR stations and he was decoded by fifteen unique stations.  He shared two-way reports with WH2XCR and notes that Merv’s best report of his signal was -21 dB S/N and there were many reports while Neil only reported Merv once at 1204z at -31 dB S/N.  Neil indicates that this was probably “the diode effect”.

Larry, W7IUV / WH2XGP, provided reports for four WSPR stations and he received reports from 26 unique stations.  As W7IUV, Larry provided reports for seven WSPR stations.

WH2XGP 24-hour WSPR activity (courtesy NI7J)

 

David, N1DAY / WI2XUF, of the Western North Carolina Society of Cellar Dweller Propagationists reported:

“Numerically, I had my best night ever at the station generating 21 unique spots in 12 hours of operation.  It was the first night here in the North Carolina mountains in a long time without lightning activity. I have been working on my inductor system and recently replaced my variometer with one that is about physically half of the size of the old one.  I noted that the antenna system  resistance does not change at different tap settings like it did with the old one and that suggests improved inductor performance.  Also, I am continuing to add radials to the system and am well over 60 wires now.  Lets get these dog days of summer over with so I can see what this is going to do under improved conditions.”

WI2XUF session WSPR activity

 

 

Mike, WA3TTS, reported that he was listening between 0100z  and 0530z and provided decodes for WH2XXC, WH2XNG, VE3CIQ, WI2XUF, WD2XSH/15, WG2XXM, and WH2XGP while using the Northwest EWE antenna.

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

“J”, ZL2BCG, received reports from eleven unique stations, including VE6XH and he provided reports for three WSPR stations.  These session statistics for “J” were taken at 1500z.

My activity was very brief during the mid-evening as I called CQ on 474.5 kHz CW for a bit while performing a few stations performance tests related to receive systems.  Results were nominal but I was tired so I QRTed by 0243z.  No additional QSO’s were completed but I did not expect any as I did not announce my activity aside from the “current activity billboard” at the top of the website.  The days are just too long at the moment for evening activity and too few stations are active in the mornings when its quiet and I am most active.  Looking for an early morning sked?  Send me an email.

Regional and continental WSPR breakdowns follow:

North American 24-hour WSPR activity (note severe map pollution from a station in the Midwest)

 

European 24-hour WSPR activity

 

Japanese 24-hour WSPR activity

 

Oceania 24-hour WSPR activity

 

Eden, ZF1EJ, provided reports for two WSPR stations and he received reports from nine unique stations including WH2XCR.

ZF1EJ 24-hour WSPR activity

 

Warwick, E51WL, provided reports for seven WSPR stations.  Report details can be viewed here. (note that reports after 1500z roll-over to the next session’s report).

E51WL 24-hour WSPR activity

 

Laurence, KL7L / WE2XPQ, provided reports for WH2XGP and he shared two-way reports with WH2XCR.

WE2XPQ 24-hour WSPR activity

 

Merv, K9FD/KH6 / WH2XCR, provided reports for VK3HP, VK5FQ, ZL2BCG, and ZF1EJ.  He shared two-way reports with VK4YB and WE2XPQ.  He received reports from E51WL, ZL2AFP, and ZL2BCG.  Reports were once again less robust through the sunrise period than what is typically observed.  Merv’s DX report details can be viewed here.

WH2XCR 24-hour WSPR activity

 

Jim, W5EST, presents “WE2XPQ REPORTS 620 KHz GROUND WAVE SEASONALITY ON 230 km ALASKA PATH”:

“Last March Laurence KL7L, WE2XPQ, described 620 KHz 484m KGTL-AM signal versus position on the highway from Homer AK to Chugach Mts on the way from Anchorage to WE2XPQ in Palmer AK. See article and illustrations at http://njdtechnologies.net/032117/   That’s a 230-245 km RF path.

“Today’s two illustrations that Laurence sent us show that path terrain profile in two places. Here’s Laurence telling it:

“…go back to that diffraction signal from the Homer station – Interestingly, the diffraction angle gradient appears to change seasonally. We’ve lost 10dB between summer and winter as well, which isn’t local or remote noise, just signal level. The land for the first 100 miles is wooded and tundra/wetland/some mountains and seasonal ice fields.

I now lose the Homer signal completely when the intervening terrain reaches circa 3000ft at some 8 miles from me, and now doesn’t return to S/N 10dB (reasonable signal) until the mountain obstruction drops to 1000ft at 17 miles. I’ll keep an eye on it as the seasons change again… Cheers”

Jim W5EST notes: It looks like 620 KHz ground wave from Homer is getting more absorbed by the verdant Alaska woods and vegetation this time of year compared to last winter’s austere landscape and snow and ice. Moreover, Laurence may also be noticing a seasonal effect on the diffraction angle when MF encounters mountains presenting obstruction over one wavelength high.  Presumably ground wave on 475 KHz, adjusting somewhat for wavelength, would be affected similarly in areas elsewhere in the world wherever the ground cover changes as dramatically.  TU & GL!”

Signal drop to 0 db (click to enlarge)

 

Audible 10 dB S/N (click to enlarge)

 


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