Unlocking the Mystery: Why the HF Bands Are DEAD
ฝัง
- เผยแพร่เมื่อ 28 พ.ค. 2024
- HF radio was completely silenced over the past weekend. We get to the bottom of what caused it, but the benefits it can provide to VHF ham radio operators.
⏱️Chapters⏱️
0:00 What has happened?
0:53 Aurora photos
1:22 Bad for Radio & GPS!!
2:06 Too much of a good thing
3:14 Key solar indexes you need to know
3:43 The Carrington Event
4:34 How to tell when HF is going to be good
5:15 It's not all bad news though..
Current conditions at Solarham 👉 solarham.com/
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Aurora activity is a bonus for 6 meters. You can bounce signals off of the aurora and contact stations. A 4-element beam is ideal to get great DX. I’ve been doing it for years.
I have several comments:
1. Excellent explanation, I could never get to grips with the solar physics, you made it so simple, will view this video a few times till it sinks in.
2. Your high school science teacher would be proud of you.
3. I didn't know that Daleks could get an amateur radio license!
Hayden,
I remember this very same thing happened during the sun spot cycle back in 1989.
At it's peak, the HF and shortwave bands were damn near un-usable, but it got better on the down slope part of the cycle and returned to normality in 1996.
Interesting things solar cycles.
Hopefully we get some good conditions soon!
In 1990-92 i could talk dx 24/7. Was booming day and. Night
Cool seeing the lights from Australia. Being in Alaska, we see them all the time, but of course this time we had too much daylights and clouds to see them in Alaska. Normal solar flares usually create so much absorption here in KL7, we can't work anyone, much less hear anyone.
And yes, heard a few fellow farmers complaining their GPS systems were playing up!
Good Day and Thank You. Very educational and interesting for this HAM "listener". Best Regards
Glad you enjoyed it!
Great discussion Hayden! At ~2:36, you mention that HF transmissions can get absorbed by the ionosphere during a geomagnetic storm, so they won't get refracted and therefore no skywave. There's another effect as well as described in the Wikipedia 'Ionosphere' page under the 'Storms' heading. 'During a geomagnetic storm the F₂ layer will become unstable, fragment, and may even disappear completely'. No F2 layer at all is certainly going to make the HF bands go quiet!
Yes very good point! Space weather is very interesting!
Great info! 👌🏼
Thanks! Hope you enjoy Hamvention 👍
There were strong aurora back reflections on 11m CB SSB all over the UK and europe last week ! these phone signals sounded like daleks
Yep that's exactly the unique sound!
Thanks for this informative information.
Yesterday I experienced a strange happening, 20 and 40 meter bands allowed me to make contacts as close as 50 miles! Normal distant contacts were not possible. Other Hams were commenting on ability to make close contacts as well.
Great info Hayden. Maybe it's a good time for DMR on hotspots.
It was weird, there was nothing, then I had one QSO to New Zealand (I'm in California) with 50 watts and a dipole, and then nothing the rest of the time. I'm glad I got on the air, I hadn't played radio in weeks and the aurora got me motivated.
Pretty wild for sure. Last week we went out to get some pictures of the Northern Lights (I'm in Canada), and had to use our GPS. Took longer than usual for our GPS to acquire a satellite so there was the effect mentioned. Watching the lights was amazing.
Very cool indeed!
Great stuff, and thank you for the deeper explanation!
No worries hope it was helpful!
thanks for the clarity, and kudos for the reference to Dr. Skov
Tamitha is the go-to for this kind of stuff!
Nice video mate!
Welcome to my almost daily issue here in Alaska. Another reason why logging Alaska is difficult for DX certificates. The Aurora Steel pot. Good video and thank you.
Thanks! I never thought about it that way - how often do you get disruptions?
I am going to take a Break from HAM Radio for like a Week or so. The Bands going to be super crappy...mostly dead as a Horse. Sporadically there is going to be some openings but not lasting long time. It repeatedly happens on every Year in the month of May.
6 meters was open for voice and CW in pockets, but it was strange though - everyone sounded like they were the Borg from Star Trek. I was tempted to call CQ saying that I was Borg!
40 meter in east side USA is great. Everything else here mud
Yeah i noticed the same
You have 1 more year 2025 is the height
@@jeffwright6685 and then it goes south for how long?
thanks so much for this video - I'm basically VERY new at HF and even though there were questions on the test about this it has been difficult to udnerstand and put into practice. I did a POTA last weekend and it took 4 hours to be able to activate the park I was in and that included FT8 and SSB - I wanted to do it totally with SSD but I just couldn't hit 10 but at least with the handful of FT8 I was able to do it. It was brutal to say the least...
No problems glad it helped! Good luck on your next activation
@@HamRadioDX This weekend was pretty rough too - might have been my antenna...
Just for curiosity sake, I put a digital volt meter across my vertical and horizontal antennas and I noticed that my horizontal antenna accumulated the most DC voltage reaching a high of 87 millivolts. Still a minuscule amount of energy induced into a 70 ft long piece of wire.
I was able to chat with a guy that's 90 miles away off of a repeater that's WAY out of line of sight (other side of a large formation of rolling hills) for my handheld GMRS.
Complete washout on Saturday and Sunday and slightly picking up today..even the regularly heard hf nets were not copy able here in Chennai.
It's quite amazing how the sun can be our friend one minute and then next our arch enemy!
Interestingly 10m (28MHz) did not receive the memo! Despite the complete dropout of most HF bands, 10m has been wide open (from VK4 at least) to all continents. Who knows how or why this single band was spared - actually enhanced to this amazing level. VK4UH
I would guess as the MUF goes up, the LUF (I just made that up!) goes up as well, so where we can't normally use 80m in the day, I'm guessing we couldn't use up to 15m or 12m, but could use 10m. There's also Sporadic E, there was a lot of that about as well.
During the height of the storms I was not able to hear my state police on 155.58. The repeater is about 40 miles to the north. 18 hours later no problem.
Nice job.
I got a new DJI drone the other day.... It is grounded because of solar flares. GPS and 2.4Gh spectrum hopping is affected.
Outback South Australia is just one big magnetic solar collector.
I was able to make three 6M contacts on FT8 over the weekend. Saw on the spotter that some areas of the USA was open down your way.
Yeah it was open the following morning here (well not here but in Northern VK)
It all happens every day, just over a smaller frequency spread. On 40m, it's open worldwide in darkness, and goes local during the daytime. Why? The ionosphere is always ionized enough to reflect 40m signals back to earth. The radio wave excites an ionized +- pair, which moves and then reradiates the signal a quarter cycle later, inducing a height-dependent delay that does the reflection. In the daytime, the sun ionizes down to lower altitudes, where the mean free path is smaller, and the +- pair collides with something before it reradiates, and the radio wave is turned to heat (absorbed). Higher frequencies survive shorter mean free paths, and even higher frequencies don't reflect at all. So it's always 3 regiemes: absorbed (low freq), reflected (medium freq), unreflected (high freq). Exceptional solar activity ionizes deeper into the atmosphere, turning everything into daytime low frequency. Normal solar produces reflections at 20m and absorption at 40m daytime, and reflections at 40m and no reflection on 20m nighttime.
Was 6 meters any good? (don't have a 6M antenna yet so idk ?!)
Yes 6m was good via auroral propagation. Yagi or directional antenna is really needed, pointing south
Zl1gam bad on 80 and 40 metre band
Heck, I thought you were gonna say it was FT8!
I checked 7mhz on Saturday, it was pumping better than usual in my opinion, I don't know why people were saying HF was dead? Maybe the DX was down but NVIS was fine.
VHF was great, though...
Worked VK9DX on 6m FT8 with 100w and a HO loop from central CA. The bands are not completely dead you just have to hunt harder for DX.
I did pick up a new country on ft8 40m yesterday, though it hasn't been confirmed yet.
some of the Australian MW frequencies also crashed, with no propagation
Still working some dx on 11 mtrs from the uk tonight... All short stuff... North Italy Poland and Germany... Great for groundwave as well being quiet.
Had great backscatter on 11 during storm and arora peak.
Pay attention to the BZ index as well. I negative value can indicate a stronger negative interaction of the Storm with our magnetosphere...
Here in WI USA our radio been dead starting day before eclipse in april bheavy( 10+s units) static day before and of eclipse then reduced for week and dad since now over month hope turnaround coming
That audio clip just sounded like a normal QSO between 2 heavy smokers.
LOL
Of course i would test my new SDRplay dx the first night of the aurora in the UK and wondered if i had a faultly unit!
Quickly discovered that this was the same for my RTL-SDR then shortly after @TechMinds let me know of this unprecedented phenomenon 😂
FT8 and JS8 40 and 17 still going somewhat though lower levvel absorption playing havoc. As the lower layers recombine more quickly they should unmask still highly refractive higher layers leading to some good DX off the back of this.
Carrington Event was estimated to be an X45 flare. The largest of the recent bunch was X5 something. Its a log scale. X45 is 10^40 times stronger than an X5 !!!!
Imagine if that hit us - ouch!
Das Problem ist das man nirgends mehr eine Antenne aufbauen darf.
Sunday 6m and 10m FT8 was pumping - go figure?
Was plenty of Aurora and sporadic E aurora on 10m here in norway. No problem to work FT8 via aurora ES. Audio is clear
I noticed between VK4 and USA was good. VK4CZ was working them well
AM Radio. Shortwave Radio. CB Radio including the Free Band has been awful last few days here in North America & this storm will continue.
It has been good for the past week now irs back to nothing. Ive been on 38 lsb call freq
There is no mystery here at all !! This has happened many times in the past, just as severe. Hams have come to expect this every Solar Max.
There have been mass ejections bigger than than Carrington event but earth dodged them as they were on the other side of the sun.
Sounds like Steve and David need to ease up on the ciggies.
Interesting stuff thanks
High solar cycles help conditions. X rays from solar flares do not. A little bit of enhancement to the ionosphere is good. Storms are bad.
They aren't dead, they're just taking a nap. A really long nap....
Aurora Borealis!? At this time of year, at this time of day, in this part of the country, localized entirely within your kitchen!?
Yes champ
@@HamRadioDX May I see it?
@@DellFargus All gone
It's ATROCIOUS. I can't even get out on ft8.
Ft 8 doesnt even count
@Jeff-sp7bg oh boy here we go..🙄
Yep. It was dead! Yay first!
Dead on arrival :-)
1st!
🏆
Like giant solar pimples popping and throwing junk at us.
5:55 I think he needs a throat lozenge
That's Backscatter skip.
@@cariboooutlaw4852 yeah it was a joke
Check out "Aurora Propagation on 6 Meters Keith’s Ham Radio World" - he has a video of turning his antenna from a direct contact to auroral and back again.
As opposed to low frequency? No. FM is much better. Most of your radio stations are on high frequency wavelengths because AM suffers so much interference.
Ive seen the sfi at 220+ and the k was 1 k 1. I heard nothing. Zilch. In my opinion those numbers are worthless
The record auroras are an indication of our own weakening magnetic field and our own inevitable pole shift by 2050.
cq from hell hahahahahahaha
Why is it nobody is talking about haarp? Its even on their website that the experiments can cause auroras, they transmit between 2.8 - 10mhz and amateurs are encouraged to follow along and send signal reports. The experiments were to run 8-10th may coinciding with the auroras. Nobody in amateur radio is talking about this and you all seem to think its a natural phenomenon
Did you not see the CME from the sun? People saw it happen and gave a warning it was going to hit earth.
America should stop messing around with the planets atmosphere. It belongs to us all
Activated. Only made 33 qsos via ft8.