On May 26, at 1300 GMT AMSAT-LU plans (weather permitting) to launch a balloon carrying a linear multimode transponder V➤U, CW, SSB, FM, APRS LU7AA-11 and VIDEO.

It could last 9 hours if it reaches 82,000 feet height landing in Uruguay, or 6 hours landing at Gualeguaychú. The flight has been approved by ANAC/EANA.

Flight forecast: http://lu7aa.org/pronostico.asp?callsign=LU7AA-12

An attempt will also be made to launch LU8YY PicoBalloon emitting WSPR at 20m, if the winds help it could go around the world.

In Merlo, from May 24 to 26, presentations will be made to schools and universities. Depending on the weather it could be launched on May 25.

This experience will provide 4 FM channels + 3 CW + 3 SSB + 1 digital channel and 1 SSTV, all simultaneous. It will allow field testing on a balloon the future satellite platforms planned by AMSAT Argentina.

For latest updates check http://amsat.org.ar/?f=merlo

As we are now at the peak of the solar cycle, some radio amateurs are using WSPR on the 28 MHz band for their Pico-Balloons as they travel around the world.

Back in April of 2024, I had a post about reception of the KD9NGV pico-balloon as it made its way off the west coast of Ireland to the North Sea. See post HERE

I often see these pico-balloon on my receive list for 28 MHz WSPR but they're nearly all somewhere far away and the propagation mode is via the ionosphere. What I find interesting about the rare really close passes is that there is no propagation mode as such, the balloon is essentially line of sight to my location.

KJ7VBX-11... On the 8th of May 2024, I noticed that I was hearing the KJ7VBX-11 pico-balloon early in the morning just as it had woken up with the sun shining on it's solar panels. I was able to hear it pretty much all day from 07:40 UTC until 18:20 UTC.

During this time, it travelled from a spot off the west coast of Ireland, over the northern counties of Donegal, Derry and Antrim in Ireland, over the south-west of Scotland and then over Cumbria in England before falling silent for the night.

On the 9th of May, it woke up over the English Channel and then headed over the Netherlands.

The balloon is at an altitude of about 13,500 metres or 44,000 feet. The WSPR transmitter is supposed to be 20-milliwatts. As far as I know, it was launched on the 2nd of May 2024 but there seems to be very little information about it.

Format... Early on the morning of the 8th, I was the only person reporting it and it was the only signal I was hearing so I was able to do some tests without any confusion from other signals.

The WSPR transmitter on the balloon seems to have two formats. The first one is shown above. The transmitter turns on as a plain carrier for 30-seconds and then sends one WSPR transmission. I presume this carrier is to warm up the transmitter which is at or below 0 deg C and the 30 second carrier stops any drifting of the following WSPR signal.

The second format is shown below...

This time, there is a second WSPR transmission after the first one.

This is a sample of the decodes that I got in the space of about an hour...

The short format results in just a KJ7VBX decode.

The longer format results in an additional decode which are shown above in red.

At first sight, they look wrong. The callsign, locator and power levels seem to be nonsense. However note that the callsign field starts with a zero. This is a special data WSPR signal and contains the information about the location, altitude, temperature and battery voltage. It's just the WSJT-X receive software shows it in a format that doesn't seem to make any sense.

In conclusion... The balloon is currently heading over Europe so it's going to be line of sight to a lot of stations. Just listen on WSPR on 28 MHz and see if you can hear it.

A Stroudsburg teens’ passion for radio

[Stroudsburg, Monroe County, PA (WBRE/WYOU)] In this week’s Here’s to You Kid segment, 28/22 News met a young ham radio operator. It’s not only his hobby, what he does also involves helping save lives.

14-year-old Samuel Thrall, W3GZ,  is a member of the Eastern Pennsylvania Amateur Radio Association (EPARA.) He passed three levels of the FCC Amateur Radio Licensing exam and now helps at the Monroe County Public Safety Center.

What interested him in ham radio in the first place is simple. “The scientific aspect of it is very interesting because it’s a technology we use on a daily basis. Our phones are all powered by radio just with computers built into them,” Samuel explained.

…read more and watch the video

As a ham radio operator, Lacy, of Middleburgh, had interesting perspective on Boston Marathon

[Middleburgh, MA] There are an estimated half a million spectators along the Boston Marathon course in any given year. If you’ve run the race, you know what a half-million voices stretched over 26.2 miles of Massachusetts roads sound like.

Of the over 9,000 volunteers that work Boston, over 300 serve as the voice of the marathon in their own way, but also serve as the eyes and ears. For the last two years, Matt Lacy of Middleburgh has been one of them. On Monday, he took up his assigned station at Mile 11 as one of the amateur (ham) radio operators who play an important role from start to finish by providing a communication network that supplements the other public safety personnel and resources vital to this massive enterprise.

“For the ham radio folks, it’s the premiere public service event, the chance for us to get the experience doing one of these events, having to report to whatever levels we need to, working within the confines of whatever section of the course we’re on,” Lacy said on Wednesday.

…read more

TAG students launch solar-powered balloon

[Iowa Falls, IA] Riverbend Middle School TAG (Talented and Gifted) students launched a solar-powered balloon on April 5 from the school, after a presentation and help from amateur ham radio operator Jim Emmert of Pella. The balloon named PENS-p22 traveled across Iowa, Illinois, Indiana, Kentucky, Tennessee, Virginia, North Carolina, the Atlantic Ocean, Morocco, Algeria the Mediterranean Sea, Italy, and the Adriatic Sea.

“I am constantly on the lookout for guest speakers, fascinating projects or unique things that we could learn about,” TAG teacher Amanda Fjeld said. “I value exposing students to new topics and projects of any kind. I am constantly brainstorming ideas and often ask others for engaging project ideas. My friend Jen, who is from Pella, told me about Jim’s Solar Balloon program, so I reached out to him. I was especially excited because I lack knowledge in the world of solar technology and weather patterns but want to expose students to more science-related opportunities.”

Emmert is a retired teacher who lives in Pella and travels to different schools teaching students about amateur radio, earth science, balloons, and GPS technology. He also launches Pico balloons and gives predictions and tracking to the students.

“Our students spent about three hours on the morning of April 5 learning and launching the balloon,” Fjeld said. “It was one of the few times I have had all of the students in TAG in 6th, 7th and 8th grade come together on one project, so it was encouraging to see them interact and work together.”

…read more

On the 28th of November 2023, Perri Moore KD9NGV launched a Pico-Balloon from Illinois in the United States with a solar powered payload that transmits a WSPR beacon on 28.1246 MHz.

Most of the Pico-Balloons launched from the USA tend to take a path closer to about 30 degrees north of the equator and cross areas like the north of Africa and south Asia. In contrast,  the KD9NGV balloon seems to have covered a much wider area and has been reported at more northerly latitudes as shown on the map above.

By the 16th of December 2023, it had gone around the world once! By the 19th of February, it had gone around the world three times. By mid April 2024, it has gone around the globe multiple times and the red dots on the map show where it was when I received some of the WSPR signals over the last few weeks.

It then went silent as darkness fell. Once daylight broke again on the 8th of April, it was over the North Sea and GM4WJA started to report it.

At the time of the screen grab, LA3FY/2 in Norway was hearing it and it continued then over Scandinavia. It has since crossed over Russia and at the time of writing is up over the far north of Canada.

KD9NGV Payload... The actual payload pre-launch is shown below.

The 28 MHz WSPR signal is generated by a Si5351 clock generator and the power output is just 9 milliwatts... 0.009 watts!

The antenna is a vertical half-wave dipole made of #36 enamelled wire.  The top half is from the balloon to the U4B tracker (QRP Labs) and the lower half hangs below the tracker.  Three Powerfilm MPT 3.6-75  in a vertical triangle provide the power.  The complete payload weighs 12 grams.

The balloon is described as a "silver SAG Balloon with Helium.".

In conclusion... I have noticed these WSPR pico-balloons many times on the 28 MHz band before but they are nearly always flying over some exotic location. It was just unusual to have one pass so close and be line of sight.

Thanks to Robbie, EI2IP putting a post up on Facebook, I noticed that a high altitude balloon was crossing over Ireland due to the easterly winds over the country and it was transmitting on the 432-440 MHz 70cms band.

I remembered that I had managed to decode RTTY signals from a balloon over the UK a few years ago and I found it fascinating. It was always something on my 'to do list' to try again but I forgot all about it. When I checked today, that reception report was back in in July of 2018!

So there was no time like the present, I followed the links and started reading about it. 

Part 1 of 2... The high altitude with the amateur radio payload was named Flybag-2 and had been launched from Maastricht in the Netherlands. It was transmitting on two frequencies on the 70cms band with data on it's location, height and internal temperature.

The payload was transmitting using the Horus Binary (v1/v2) modulation format which is a digital signal that is way superior to the old RTTY mode.

I downloaded the software to decode the Horus Binary signals, starting to mess about with the various settings, tuned the radio to 437.600 MHz USB and listened....silence. 

The balloon had just cross over the east coast of Ireland and was heading west. I was using a homemade vertical colinear in the attic of my house which wasn't the best for listening for weak signals from a tiny transmitter 120kms away.

I also had the WSJT-X software running as well and I could make out weak traces in the waterfall. I tuned the radio down about 500 Hz to 437.5995 MHz. Eventually I could hear the signal weakly but still no decodes. Time to read the instructions.

The instructions said the audio level needed to be near -5dB. I had the volume well down and the software said it was 'good'? I tried turning the volume of the radio way up and success!

The stats show that I managed to get 20 decodes in total which is 20 more than I thought I'd get. The attic antenna is really blocked a lot in that direction so I was delighted to get anything.

Part 2 of 2... A few hours after Flybag-2, another balloon named Flybag-4FSK crossed to the south of Ireland. I had a lot more success with this one getting 71 decodes in total with my attic antenna.

The first decode was when the balloon was about 300kms away over the Bristol Channel and just below the horizon. My view to the east is pretty good and this resulted in a lot of decodes.

It was interesting to note that the signal was reasonably consistent up to about 00:24 UTC and then it dropped suddenly and the last decode was at 00:40.

This is the location of the balloon relative to my location. The balloon is slowly moving to the left (left).

This is the horizon from my location. The balloon from my point of view would have been moving slowly from roughly east to the south of me and then to the south west.

When the balloon was to the south-east, I was getting a lot of decodes as my horizon is close to 0-degrees in that direction. Once it got to 00:24 UTC, the local hill had an elevation of 1-degree. Beyond that, the signal dropped as the elevation of the hill got higher. 

After 00:40, the local hill had an elevation of about 3.5-degrees and it was now blocking the signal.

I knew my take-off in that direction was poor but it was interesting to see conformation of it.

High altitude balloon... There are generally two types of balloons. The one I heard back in 2018 was like a weather balloon, it went up to an altitude of about 20kms and then the balloon burst.

This time, the balloon reached a height of about 4kms where it levelled off. Unless the hydrogen/helium gas escapes or it hits rough weather, it should stay up for quite some time.

STEM... It also strikes me that this would make a great STEM project. Schools and colleges can't afford microsats but a low budget balloon could teach a lot about tracking, propagation, layers in the atmosphere, weather, etc. 

For more information, go to https://amateur.sondehub.org/

In this MiscDotGeek article, we’re trying something… different. This is an experiment. You know my writing, you know my style. Read the article. Poke holes in it. Why? See at the end (don’t cheat!) High Altitude Balloons: Unlocking the Potential of Near Space Exploration Have you ever wondered what the view from the edge of …

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