The details for April 6, 2016 can be viewed here.
It was not a very good session for stations in the East and I’m going to bet that most stations experienced a night of down overall band conditions. The QRN is really not a surprise. It’s April and this pattern will more than likely continue until October. Current propagation is a bit annoying because its been a long time since we have strung together so many days of poor propagation. Trans-Pacific openings with Oceania continue to show some life as the days get shorter and weather moved into a Fall pattern down under.
Geomagnetic conditions reached unsettled levels again and the entire propagation mechanism seems to be out of order on 630-meters. The Bz is pointing to the South, more so than the previous session, and solar wind velocities have increased again, averaging 475 km/s. DST values have returned to the center line although there is currently high variability.
There were no trans-Atlantic openings during this session.
Eric, NO3M / WG2XJM, reported that he was QRV on 474.5 kHz this morning beginning at 1103z until his sunrise at 1115z.
Paul, N1BUG / WI2XTC, reported moderate QRN as he provided reports for six WSPR stations.
John, WA3ETD / WG2XKA, reported noisy and wet conditions in Vermont. He decoded seven WSPR stations and was decoded by 30 unique stations while at QRP ERP levels (about 75W TPO due to tuning variability).
Rick, W7RNB / WI2XJQ, reported more of the same with nothing East of the Mississippi river. He provided reports for eight WSPR stations and was reported by 23 unique stations. Rick’s unique report details can be viewed here.
Dave, N4DB, reported high QRN during the evening and approaching storms by late evening forced him off the air. He indicated that WG2XKA was in at -22 dB S/N.
Trans-Pacific report details, excluding KL7 and KH6, can be viewed here.
Roger, VK4YB, reported, “Another good DX session. QRN stayed low. VE6XH stats: 160m 2 spots, both -11, 630m 3 spots, best -26.” He received reports from JA3TVF, JH1INM, VE6XH, VE7BDQ, VE7SL, W7IUV, WH2XCR, WE2XPQ and WH2XGP. He provided reports for WG2XXM, WH2XXP, and WH2XGP.
Phil, VK3ELV, received reports from JH3XCU.
Ken, K5DNL / WG2XXM, reported that he decoded five WSPR stations and was decoded by 44 unique stations including VK4YB, KL7L/XE, and ZF1EJ.
Ward, K7PO / WH2XXP, received reports from 56 unique stations including VK4YB, VK2XGJ, VK2EIK, VK3ELV, ZL2AFP, JA1PKG, JA3TVF, JE1JDL, TNUKJPM, JH1INM, and JH3XCU.
Larry, W7IUV / WH2XGP, provided reports for twelve WSPR stations including VK4YB. He received report 37 unique stations including VK4YB and ZL2AFP. As W7IUV, Larry provided reports for twelve WSPR stations including VK4YB. Larry reported to VK4YB that, “…small loop had higher peak S/N but few decodes than large terminated loop. Think differences may be due to changing arrival angle, interesting to watch!”
Mike, WA3TTS, submitted this Ebay link to a receiver to which he has no financial connection. He indicates, “If any of you remember lowfer station GIR, George passed this link along. Shipping cost is high but the rx price is reasonable and it appears to be restorable….”
Hideo, JH3XCU, noticed that the FCC allocation tables changed yesterday to reflect the addition of 630-meters and 2200-meters. Those allocation tables can be downloaded in full here. (see pages 3 and 5)
It was a noisy night here in Texas – no surprise there – although propagation seemed better here early in the evening, deteriorating as the session progressed as noise increased. I let WSPR run overnight and transmission reports were OK and can be viewed here. My reception reports were down once again due to high noise and those reports can be viewed here. There was no copy on WG2XJM this morning on CW and I was running late so I had no opportunity to send any CQ’s of my own. Hopefully tomorrow I will be more punctual and QRN / propagation will be more favorable. Mornings are generally better times of operating.
Regional and continental WSPR breakdowns follow:
Eden, ZF1EJ, was probably a victim of high noise like many of the stations that typically provide him reports. He decoded four WSPR stations and was decoded by four stations including WH2XCR in KH6.
Laurence, KL7L / WE2XPQ, continues on assignment in Mexico, providing reports for several stations although Laurence noted elevated noise prior to sunset during this session.
Back in Alaska as WE2XPQ, Laurence provided reports for VK4YB, WH2XGP, and WI2XJQ. Most of his receive reports were from along the West coast but he also received reports from WH2XCR in KH6. Report details for VK4YB can be viewed here.
Merv, K9FD/KH6 / WH2XCR, reported that he popped a FET in his amp and he wasn’t going to repair it until today as it was late. He spent the overnight receiving stations, providing reports for VK4YB, VK3ELV, ZF1EJ, and WE2XPQ as well as a number of station around the North American mainland. DX report details can be viewed here.
Jim, W5EST, presents, “PART 3 ENHANCEMENTS: SUN-ALIGNED, TERMINATOR-ALIGNED, & MIXED”:
“Today’s first illustration depicts 3D propagation lines that introduce at least one additional sunrise signal path when conditions are right. The upper half-drawing views from above, and the lower half-drawing profiles or cross-sections the scene.
A transmitting station at right transmits ENE-WSW to a RX at equinox, and terminator is N/S. The TX signal executes a sky wave reflection (red dot) in the dark at great circle mid-path. A somewhat southeastwardly displaced lateral skew reflection caroms off the slanted underside of the E-region before the sunlit D-region has formed enough to extinguish signal.
The secondillustration shows a SSW path around equinox from a New England MF transmitting station to southeast USA. The sun heading is more nearly perpendicular to the path, and the oncoming terminator’s tilt bounces signal from not-far south of New England toward a southwesterly intersection to constitute the enhancement. (Angles are exaggerated to indicate the concept.)
Let’s say a pure “sun-aligned enhancement” has no lateral skew and the reflections are only displaced along the path line itself. The sun’s heading at the horizon is aligned with the path heading at the eastward station.
A pure “terminator-aligned enhancement” presumably happens at MF when both MF reflections are halfway between TX and RX but laterally displaced. The sun’s heading at the horizon is perpendicular to the path heading.
Pure terminator-aligned enhancement at MF may apply only to one hop MF propagation. Although one might want to call it MF gray line prop, I hesitate to identify an MF terminator-aligned enhancement with HF gray line DX propagation. I say this mainly because MF lateral skew* will reach the RX on the first hop, but ground reflection there will send the enhancement signal away from the terminator sideways into the night. I think the mechanisms of HF grayline and MF terminator-aligned propagation must be different.
Most enhancements will be a mixture of sun-aligned and terminator-aligned components, like the two illustrations.
There’s lots more to know about MF enhancements. I would especially like to see some examples of pure terminator-aligned enhancement at MF. Bring us up to speed with your MF enhancement experiences!”
*ENDNOTE: Presumably, in a pure terminator-aligned enhancement, a small MF lateral skew angle σ (sigma) would result from a few degrees of reflecting E-region tilt angle T and significant path distance D: σ ~ arctan[(2hE /D) tan T]. The formula is not exact since the skew reflection occurs on the E-region slant at less than the nighttime E-region MF reflection height hE. The skew reflection would occur about halfway along the path but be displaced laterally from great circle midpath.
Additions, corrections, clarifications, etc? Send me a message on the Contact page or directly to KB5NJD gmail dot (com).