NJDTechnologies

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

Current Operating Frequency and Mode

QRT but I'll be back tonight, WX permitting

SCHEDULED ACTIVITY: CQ 474.5 kHz CW by 1000z through sunrise most days, WX permitting

Ouch! Geomagnetic “perfect storm” makes for rough evening in North America but big surprises by morning; VK4YB <-> WH2XGP ->VK2DDI,VK2XGJ, VK3ELV EJTSWL; A first with VK4YB -> VE7CNF, VA7MM; VK4YB <-> WH2XCR ->EJTSWL, JA1NQI-2, VK2DDI, VK2NP, VK2XGJ, VK3ELV; G0MRF amplifier ready for air; W7RNB builds a noise canceller; Upcoming CLE event this weekend; KL7L antenna comparison redux

– Posted in: 630 Meter Daily Reports, 630 Meters

A surprise geomagnetic storm (G1) wreaked havoc during the evening in North America.  I try to keep these discussions very positive and upbeat but to borrow a description from Laurence, KL7L / WE2XPQ, last evening was just awful from my perspective.  In the evening, I could not get my signal to move further North than W5EST although East / West stations like WH2XAR and K4LY were hearing me at grossly reduced levels.  RF does NOT like regions of high electron density and we had a lot of that.  Fortunately the storm’s initial surge subsided by 0600z and reports returned to something closer to normal.  The band was at least headed in the right direction which produced significant positive results for a few stations on the West coast and Pacific as sunrise approached.

The Bz pointed very strongly to the South although it, along with the Kp, calmed overnight.  Solar wind velocities exceeded 530 km/s.  DST suggests profoundly disturbed band conditions.

planetary-k-index 082416

 

Kyoto DST 082416

 

Australia 082416

 

It was also noisy and seemed to get noisier here as morning approached.  It is my opinion that noise propagation was also impacted by these geomagnetic conditions because storms in West Texas were raging early in the evening and I could not hear much from them.  In the Midwest it was a different story as Ken, SWL-EN61, in Indiana was preparing for a stormy night by using the “hula-hoop” loop inside the house during the session:

Lightning 082416

11-hour Lightning summary for North America

 

Evening JT9 at 0400z was stifled by the lack of propagation and noise so many of us retired for the evening, unsure what we would find by morning.  Morning propagation improved tremendously but noise had gotten worse here.  I did transmit a bit of JT9 starting around 1005z but did not have high expectations.  Ken, SWL-EN61, in Indiana decoded a number of my CQ’s in addition to Ken, W8RUT / WI2XFI, who was calling me.  It was just too noisy so, at best, I was a beacon today:

SWLEN61 JT9 082416

WG2XIQ and WI2XFI as reported at SWL-EN61 in Indiana

 

Morning CW was challenging due to the static crashes from the storm system to the North and West.

Larry, W7IUV / WH2XGP, had a remarkable overnight session,  reporting that more VK stations heard him than VE stations.  He also indicated almost no reports from the East.  He decoded VK4YB six times, which is more reports of Roger than he has ever decoded in a single session.  He decoded six WSPR stations and was decoded by 26 unique stations, five of which were VK’s:

WH2XGP EJTSWL 082416

WH2XGP, as reported by EJTSWL

 

WH2XGP VK2DDI 082416

WH2XGP, as reported by VK2DDI

 

WH2XGP VK2XGJ 082416

WH2XGP, as reported by VK2XGJ

 

WH2XGP VK3ELV 082416

WH2XGP, as reported by VK3ELV

 

WH2XGP VK4YB 082416

WH2XGP, as reported by VK4YB

 

VK4YB WH2XGP 082416

VK4YB, as reported by WH2XGP

 

Toby VE7CNF and Mark, VA7MM,  decoded VK4YB as well which is believed to be the first VK for both:

VK4YB VA7MM 082416

VK4YB, as reported by VA7MM

 

VK4YB VE7CNF 082416

VK4YB, as reported by VE7CNF

 

John, WA3ETD / WG2XKA, recognized the “seasonal reality check” for this session, providing the following comments and map:

“Seasonal reality returned with an average session with
activity confined to the central/eastern zones.  WG2XIQ
was spotted here.  Much cooler temps at night are causing
heavy dew and wet fog that may be impacting things – but
there is no question that good times are lurking…”

WG2XKA 082416

WG2XKA session WSPR activity

 

Neil, W0YSE/7 / WG2XSV, was able to take advantage of the improved conditions by morning and offered the follow statistics and comments:

WG2XSV 082416

 

Steve, VE7SL, sent details about a CLE event coming up this weekend:

“John – the ndbDX group is having their monthly CLE event this weekend. Part of the range covers the 630m band and they have a request that some of the experimental folks may be interested in … putting their beacons in the CW mode for the three nights or if not, maybe for Saturday night. If they do, it would be best if they throttle the CW down to match typical ndb speeds as some of the guys can not manage fast code but are OK with the slower speeds.
I’ve more details on my blog this week.

Steve”

 

David, G0MRF, sent a note that he has completed work on the 300-watt amplifier board reported recently and he has placed a draft article with details on his websiteIt was previously reported that the amp needed an external low pass filter for use in the US but this is not the case.  The filter itself may be rated at 35 dB below fundamental but due to the balance and push-pull nature of the devices, the actual output at second harmonic is better than 60 dB.  Many thanks to David for clarifying this details.  David indicates that he will likely not produce a full kit due to complications with VAT and component cost in Europe but he may offer the board with the three SMD chips soldered in addition to the 3C90 ferrites.  This is a very attractive amp with protection facilities not afforded by the GW3UEP amp that many of us are using.  It’s also amazingly compact!

G0MRF 082416

G0MRF Class-D 300-watt amplifier

 

Rick, W7RNB / WI2XJQ, has built a “XX-Phaser / noise enhancer” and provided this article to discuss the build.  I look forward to hearing his evaluation  of the unit over the coming season.  Rick also provided the following session statistics:

WI2XJQ 082416a

 

WI2XJQ 082416b

 

Laurence, KL7L / WE2XPQ, sent a note detailing the results of his recent antenna / software comparisons.  He is very careful to state that these results are pertinent to his installation at his location ONLY.  If he were in a different environment, none of this might be valid.  Trees and foliage can have a massive impact on RF at these frequencies.  Here are a few of his comments:

“Im sort of finished testing now and can pretty confidently say what works best.

Note though the worst to best variation best is only a dB or two. Caveats are local noise variations due to induction or electric fields due to proximity, and or induced common mode noise, which I think Ive virtually now eliminated or are at least equal in the tests.  I suppose also rx noise figures and rx antennae efficiencies  too make some but as Ive realized here Im pretty close to optimum within physical and environmental constraints at this QTH – I need more space!!.

So here we go in order of average effectiveness or positive decides  –

1) The best overall system here is an extended L400b up at 10m in a tree. Quad RG6, common mode chokes/isolators and wsjtx (we2xpq/1) – Omni but quiet, beats the mag loop and W7IUV low noise head amp/cable driver which suffers more from noise from mag field induced from 400m distant underground dog fence

1a)  Just a little less in number average decodes but occasionally better to the SE is AMRAD W1VD probe at 8m,  Quad RG6, common mode chokes/isolators and wsjtx. I ran this antennae early in the tests and it decoded slightly less than 1).  Its located just 10m to the West of 1) –   Its bonded to ground via multiple rods and into the lake bottom.

2) Another L400b at 20m, 400ft Quad RG6, common mode chokes/isolators and wsjtx (Kl7l/1)  – slightly nosier at all heights (4-20m) but did have one more VK4YB decode over 1) on multiple days.  It was back at 20m agl last night, again bonded to ground by roads into the lake.

3) 10T or so 10ft diameter VE7SL rotatable loop with modded W7IUV head amp (added power up the coax and choked to drive 400ft RG6 quad) –  Last night it was used beaming to VK on 235degT which is kind of the worse direction dog fence noise wise but gave the same VK4YB  S/n decode as 1) and 2) – didn’t pick up the later decode of VK4YB, but is a good tool for noise discrimination – Its typically noiser in the mag and probable induction field of a number of local and not so local noise sources bespoke to this location –  In some directions it might well be higher in the table  and may well prevail later in the season over the pole. The loop is useable with switched tapping’s from 60kHz to around 490kHz which reasonable unloaded Q.”

Some general comments and observations about software, other modes and his relocated Marconi-T transmit antenna follow:

“WSJTX typically afford 0-2dB deeper decodes – but its not as good for decoding tx freq bananas or slopes as WSPRX. It does sometimes miss one or two in series which may be PC processor related and not environmental/true decoding power.

WSPRX is a pain on uploading fails to WSPR Org but performs “ok” as an alternate differential piece of software – it may catch the occasional that wsjtx doesn’t.

WSPR2.1 is very similar to WSPRX decode wise to date – just got to remember to check uploads were received by wspr net/org. This morning it had failed to load automatically about 50%.

Im still thinking using visual detection modes our and VK signals are getting way way further than presently decoded down to -33 – Im just not sure why there is no or very little ZL activity on WSPR 475.

Tx efficiency  – So Im pretty close to defining my ERP as 1W during the wet forest days of summer with the nested Marconi at 65ft and large topload – that’s with 200W going into the base! Its 2.5dB down on a 3W ERP loop (Im pretty close) – estimated ERP in the winter – we will see as this is a new shorter config.”

Regional and continental WSPR breakdowns follow:

NA 082416

North American 24-hour WSPR activity

 

EU 082416

European 24-hour WSPR activity

 

JA 082416

Japanese 24-hour WSPR activity

 

VK 082416

Australian 24-hour WSPR activity

 

There were no reports from the trans-Atlantic, trans-African or trans-Equatorial paths.  UA0SNV and 8P9EH were present but no reports have been filed at this time.

In the Caribbean, Eden, ZF1EJ, operated two receivers and two antennas, copying me through the abysmal evening band conditions.  Thankfully signals moved well enough laterally and to the South for reports to be registered:

ZF1EJ 082416

ZF1EJ 24-hour WSPR activity

 

ZF1EJ1 082416

ZF1EJ/1 24-hour WSPR activity

 

Laurence, KL7L / WE2XPQ, reported this morning that “…could have been a lot worse on some bearings as K=5 here -XPR /3 was AMRAD/W1VD probe and wspr2.12/ts870 test set up…”  Note that WE2XPQ/2 was not in the mix for this test.  Reports were amazingly consistent through these seemingly disturbed band conditions:

WE2XPQ 082416

WE2XPQ 24-hour WSPR activity

 

WE2XPQ1 082416

WE2XPQ/1 24-hour WSPR activity

 

WE2XPQ3 082416

WE2XPQ/3 24-hour WSPR activity

 

KL7L 082416

KL7L 24-hour WSPR activity

 

KL7L1 082416

KL7L/1 24-hour WSPR activity

 

VK4YB WE2XPQ 082416

VK4YB, as reported by WE2XPQ

 

VK4YB WE2XPQ1 082416

VK4YB, as reported by WE2XPQ/1

 

VK4YB WE2XPQ3 082416

VK4YB, as reported by WE2XPQ/3

 

VK4YB KL7L 082416

VK4YB, as reported by KL7L

 

VK4YB KL7L1 082416

VK4YB, as reported by KL7L/1

 

WH2XCR WE2XPQ 082416

WH2XCR, as reported by WE2XPQ

 

WH2XCR WE2XPQ1 082416

WH2XCR, as reported by WE2XPQ/1

 

WH2XCR WE2XPQ3 082416

WH2XCR as reported by WE2XPQ/3

 

WH2XCR KL7L 082416

WH2XCR, as reported by KL7L

 

WH2XCR KL7L1 082416

WH2XCR, as reported by KL7L/1

 

Merv, K9FD/KH6 / WH2XCR, reported afternoon storms and lots of noise that did not seem to hurt his session, decoding VK4YB with the 80-meter dipole that is still on the ground in addition to decodes by JA1NQI-2 and the usual group of VK’s including VK2NP whose reports of Merv have been absent since earlier this year:

WH2XCR 082416

WH2XCR 24-hour WSPR activity

 

VK4YB WH2XCR 082416

VK4YB, as reported by WH2XCR

 

WH2XCR VK4YB 082416

WH2XCR, as reported by VK4YB

 

WH2XCR VK3ELV 082416

WH2XCR, as reported by VK3ELV

 

WH2XCR VK2XGJ 082416

WH2XCR, as reported by VK2XGJ

 

WH2XCR VK2NP 082416

WH2XCR, as reported by VK2NP

 

WH2XCR VK2DDI 082416

WH2XCR, as reported by VK2DDI

 

WH2XCR JA1NQI2 082416

WH2XCR, as reported by JA1NQI-2

 

WH2XCR EJTSWL 082416

WH2XCR, as reported by EJTSWL

 

Jim, W5EST, returns for a road trip and presents “RRR: REMOTELY RE-VIEWABLE RECEPTIONS”:

“630m ops aspire to reliable JT9 QSOs spanning distances at least halfway across North America–and far more than that!  Due to the variability of 630m SNRs, JT9 decodes of the same 630m TX station may occur at a first RX1 but not a second RX2, and then soon at RX2 but not at RX1.

The March 24 blog gives a backgrounder on 630m RX1/RX2 poor man’s diversity. http://njdtechnologies.net/central-us-storm-system-and-slow-start-turns-to-strong-session-with-north-american-trans-atlantic-and-trans-pacific-reports-jarl-announces-more-details-for-their-mf-and-lf-award-vk3elv-f6cni/

The diversity I have in mind involves screen sharing the decodes of diverse receptions of the same distant TX by two or more RX stations within a few hundred kilometers apart from each other. This does not rule out the radio engineer’s diversity that involves RF-level phasing or some kind of digital signal processing of digimode audio streams derived by reception from different RX antennas situated along a baseline on the same station site.  But it’s not what I primarily have in mind.

Some kind of screen-sharing of JT9 can make this TX-to-rx1/rx2 type of poor man’s diversity happen.  That way, one or both of two RX operators can see the JT9 decodes that are occurring at each other’s RX stations.  For short, let’s call this poor man’s diversity technique “Remotely Re-viewable Receptions,” or RRR for short.

This kind of screen-sharing should happen at least several times per minute, and continuously if possible.  The screen-sharing technique should be flexible enough to link different types of PCs having different operating systems at RX stations situated up to about 300 kilometers away for in-continent QSOs and up to about 1000 kilometers for transoceanic QSOs.  Each RX operator should be able to view the JT9 decodes that are shared.

Indeed, two operators, or more than two, should be able to view each other’s JT9 decodes, as desired.  The TX operator should if desired be able to view an RX JT9 screen as permitted by the RX op.  RX ops should be able to chat and confirm the screen-sharing is working, using a feature of the same app.  Each op should be able to screen-share only as long as the op desires whose station screen is being shared.  A 630m op who is new to this technique should not have to download the screen-sharing app to accept the invitation of a 630m op who has the app.

Such sharing can extend the useful duration of a 630m JT9 nighttime opening and lengthen the useful distance over which JT9 QSOs can be achieved.  This blog Feb. 5 showed comparative time-sequence plots of RX1/RX2 station-station diversity for XZO-xka/w1vd. http://njdtechnologies.net/fantastic-band-conditions-we2xpq-ja1nqi-2-others-on-wspr15-wh2xcr-vk2xgj-zf1ej-strong-persistent-path-from-texas-to-minnesota-zf1ej-first-cw-qso-ea-sv/

See this blog Feb. 4 for a scatterplot of RX1/RX2 station-station diversity for XZO-xka/w1vd. The plot shows just how unrelated the SNRs can be at RX stations 1/7 the distance from each other compared to the TX-rx1/rx2 average path distance. http://njdtechnologies.net/a-slow-start-yields-good-session-in-north-america-midwinter-630-meter-activity-weekend-almost-here-we2xpq-ve7bdq-on-wspr15-wh2xcr-vk2xgj-ja1nqi-2-ve1hf-trans-atlantic-reports-high-level/

You can consider what a ham-radio-oriented interpretation of a “QSO” means when using this type of reception, see this blog Feb. 18:

http://njdtechnologies.net/geomagnetic-storms-continue-wh2xpj-dl4raj-vk4yb-vk3elv-wh2xcr-vk2xgj-zf1ej-wh2xhy-cw-beacon-active/ .

In another post, let’s discuss possible PC apps that can make JT9 RRR happen for you.  If you have a technique you already use, e-mail us so we can blog it!”

 

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