Radio: it's not just a hobby, it's a way of life

Current Operating Frequency and Mode

CQ 474.5 kHz CW and alternately tuning 472 kHz - 475 kHz for signals.

Very good band conditions over night; two-way propagation between WG2XSV and WG2XKA; DK7FC –> WH2XZO, WG2XKA, WE2XGR, WE2XGR/3

– Posted in: 630 Meter Daily Reports, 630 Meters

“Our 630M propagation reminds me of Churchill’s remark about Russia- ‘a riddle wrapped in a mystery inside an enigma.'”  – Doug, K4LY / WH2XZO

630-meters never ceases to amaze.  Just days ago band conditions seemed a little grim.  Springtime storm noise was polluting the band and hearing only a couple of stations was becoming commonplace.  While band conditions and propagation have improved since those grim sessions, last night seemed almost like a long December night.

The geomagnetic field was quiet.  The Bz was stable and generally North-pointing.  Solar wind returned to low levels, below 400 km/s.

planetary-k-index 022716


Kyoto 022716


Australia DST 022716


John, WA3ETD / WG2XKA, had what might be a season best, with a trans-Atlantic report for DK7FC, two-way transcontinental reports with WG2XSV and WH2XCR, 58 unique exchanges, and first time for the season spots from AC0ZL.

WG2XKA 022716

WG2XKA 24-hour WSPR activity


Neil, W0YSE/7 / WG2XSV, had a very strong session that started with a very hopeful waterfall at bedtime.

WG2XSV waterfall 022716

WG2XSV waterfall at bedtime


Neil also indicates that he was reported very early by Eric, NO3M / WG2XJM, and Ken, SWL/EN61 in Indiana.  This was also the first time this year to report and be reported by John, WA3ETD / WG2XKA.  Neil provided the following additional comments and statistics:

WG2XSV 022716

Neil also provided his map for the session, which was very wide ranging for 1-Watt ERP.  As I have indicated in the past, one can do a lot with very little on this band if a few variables are controlled.

WG2XSV map 022716

WG2XSV 24-hour WSPR activity


Doug, K4LY / WH2XZO, decoded DK7FC and has additional comments about this session:

WH2XZO 22716

Ken, SWL/EN61, in Indiana provided a number of all-time best statistics for his station, including decodes of 14-unique stations:

K9_EN61 email 022716

Mike, WA3TTS, had a very strong session and provided the following extensive comments and statistics:

WA3TTS email 1 022716

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WA3TTS email 3 022716

WSPR activity was high again, with 72 MF WSPR stations observed around 0200z on the WSPRnet activity page.  Regional and continental WSPR breakdowns follow:

NA 022716

North American 24-hour WSPR activity


EU 022716

European 24-hour WSPR activity


VK 022716

Australian 24-hour WSPR activity


JA 022716

Japanese 24-hour WSPR activity


There were no reports from the trans-African path.  UA0SNV and W6SJP/BY were present during the session but no reports were found in the WSPR database for either station.

DK7FC had a very good session with reports from WG2XKA, WH2XZO, WE2XGR, and WE2XGR/3 on the trans-Atlantic path:

DK7FC WG2XKA 022716

DK7FC, as reported by WG2XKA


DK7FC WH2XZO 022716

DK7FC, as reported by WH2XZO


DK7FC WE2XGR 022716

DK7FC, as reported by WE2XGR


DK7FC WE2XGR3 022716

DK7FC, as reported by WE2XGR/3


Eden, ZF1EJ, and Roger, ZF1RC, experience identical nights, reporting a number of stations across the US.

ZF1EJ 022716

ZF1EJ 24-hour WSPR activity


ZF1RC 022716

ZF1RC 24-hour WSPR activity


Laurence, KL7L / WE2XPQ, operated as WE2XPQ for transmit and WE2XPQ/1 for receive during this session and reported Ken, K5DNL / WG2XXM for the first time in quite a while.

WE2XPQ 022716

WE2XPQ 24-hour WSPR activity


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WE2XPQ/1 24-hour WSPR activity


WG2XXM WE2XPQ1 022716

WG2XXM, as reported by WE2XPQ/1


WE2XPQ WH2XCR 022716b

WE2XPQ WH2XCR 022716b

WE2XPQ, as reported by WH2XCR


Merv, K9FD/KH6 / WH2XCR, had strong reports from the mainland US, including two-way reports with WG2XKA in Vermont and VK4YB.  The path to JA continues to be cut off at the moment.

WH2XCR 022716

WH2XCR 24-hour WSPR activity


WH2XCR VK2XGJ 022716

WH2XCR, as reported by VK2XGJ


WH2XCR VK4YB 022716

WH2XCR, as reported by VK4YB


VK4YB WH2XCR 022716

VK4YB, as reported by WH2XCR


WH2XCR WE2XPQ1 022716

WH2XCR, as reported by WE2XPQ/1


Phil, VK3ELV, received the following reports from Japan and Hawaii:

VK3ELV JH1INM 022716

VK3ELV, as reported by JH1INM



VK3ELV, as reported by TNUKJPM


VK3ELV WH2XCR 022716

VK3ELV, as reported by WH2XCR


Additional statistics, comments, anecdotes, and information:

Phil, VE3CIQ, reports that he decoded ten stations and was decoded by 21 at 50 mW ERP.

Ken, K5DNL / WG2XXM, reports that he decoded 12 and was decoded by 43-unique stations.

John, WA3ETD / WG2XKA, reports that he has a digital oscilloscope for sale which came from an estate.  The sale notice can be found here.  Please contact him directly for information.  This scope would be good for scope match and the price is right.

Jim, W5EST, provided the follow discussion, entitled “PART I: 630M DAYTIME PROPAGATION USING 2/25/16 WORK PLAN”:

“The KB5NJD blog is a regular source of 630m daytime info since Oct. 25. WG2XIQ (Texas) has run one of the very few 630m transmitters on which a lot of the daytime sky wave reception information was based since Oct. 25. WG2XKA (VT) and WH2XGP (WA) likewise have provided daytime 630m transmissions.

So, TABLE I shows daytime skywave  receptions starting late October instead of my work-planned start date of Aug. 1. Appended Q&A with John WG2XIQ give some assurance that the daytime info since Oct. 25 is adequately trustworthy.

However, thunderstorms near 630m receivers could mask 630m daytime reception some days, regardless of space weather. Likewise, a station might turn off its 630m transmitter due to a nearby thunderstorm. Here at W5EST I have logged thunderstorms by region daily. Accordingly, thunderstorm tabulation by region of the 630m TX and RX stations in Eastern USA, Mid-USA, West USA is added to the work plan for attention another day.

44 daytime sky wave receptions significantly clustered by dates and accounted for 36% of the 123 days Oct. 25-Feb. 25 (four months).


Oct. 25.                                            Singleton.  October had 1 day of daytime prop we know of.

Nov. 2-6, 9-15, 18-20, 22-25            4 Clusters occupy 19 days of Nov. November had 20 days.

Nov. 30, Dec. 2, 8, 10-12, 17.          Scattered, 1 Cluster. December had 9 days of daytime prop.

Dec. 29Jan.3, Jan 512.                  2 Clusters  January had 13 days of daytime prop.

Jan. 20 & 30. Feb. 6.                        Scattered.  February has 1 day of daytime prop so far.

I’ve now assembled solar flare information from GOES-15 data from the Lebedev web site to compare with our 630m daytime skywave reception information.  In Part 2 this Monday, let’s address the question whether or how well solar flares can predict 630m daytime prop by filling in TABLE 2.

The data will tell us the False Negatives Rate and the Precision of various predictors based on solar flare levels.  Recall that a False Negatives Rate is the number of daytime prop days incorrectly predicted negative and then divided by all daytime prop days. Precision is the number of daytime prop days correctly predicted positive, divided by all the days the predictor predicted positive.

In the meantime, today let’s get acquainted with a simple “November” predictor that just says, “If it’s the month of November, predict every day to be a daytime prop day.”  The 67% precision is favorable because 630m daytime prop occurred 20 out of 30 November days.  So far, so good.

However, the 55% False Negatives Rate tells us that if 630m stations relied on the “November” predictor, they would miss the majority of the daytime prop opportunities during the four-months Oct 25-.Feb. 25. So, the “November” predictor is inadequate I think.  Moreover, I don’t trust a calendar-month predictor from year to year since 630m daytime prop might unexpectedly concentrate into some other month in other years.

See you Monday!”

W5EST table 022716

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