February Meeting: Chasing Radiosondes for Fun and (no) Profit

The next meeting of the Amateur Radio Experimenters Group will be held next Friday, February 16th at the Fulham Community Centre (formerly known as the Reedbeds) off Phelps Court, in Fulham. Doors will open at 7.45pm for an 8.00pm start.

The evenings presentation about weather balloons and RadioSondes will be given by Mark VK5QI.

“Every day, from over a thousand sites around the world, weather balloons are launched to capture atmospheric data. Under each of these is a Radiosonde, a small electronics package containing sensors and a radio transmitter. In this presentation, Mark VK5QI, will explain how these devices help contribute to global weather forecast models (used by the Project Horus team!), and how you can decode, track, and (if you are crazy enough), recover these devices from where they fall over the country.”

Everyone is welcome, visitors in particular. If you have ever wanted to know more about weather balloons this will be a great chance to hear from one of the very active balloon chasers in the state.


The March meeting of the AREG will be delayed by 1 week this year as our meeting hall has been booked out for the state election. So in March, the date will be March 23rd (the week before Easter). We hope to see you then! (A topic for the March meeting will be finalised shortly).


Horus 47: SHSSP 2018 Science Flight Report

Following unfavourable weather conditions the previous weekend, the Amateur Radio Experimenters Group planned a second attempt to fly the science payloads for the Southern Hemisphere Space Studies Program 2018 on Sunday February 4th. Again, the weather was not cooperating, which forced a change of the launch site in order to get off the ground. This meant a very early start as the launch teams left Adelaide at 7.00am to trek 150km east of the city into the Murray Mallee.

This flight was carrying a number of science experiments for the SHSSP students. This year the focus was on space navigation, so one particular focus was using the GPS data coupled with an initertial measurment unit to be able to plot the angle and direction of the camera taking the photos. The other experiment was a spectrometer which was measuring the precise wavelengths of light.

SHSSP18 Downward facing camera (courtesy UniSA and SHSSP)

Launch Preparation

Launch preparations began about 9am after the crew had arrived at the launch site. Thanks must go to Chris VK5CP who arranged access with the farmer who’s paddock we borrowed for the morning. Along the way the obligotory bakery stop had been made in the township of Mannum (I can vouch for their blueberry scrolls). Today we had a couple of new faces on the flight team, with Marcus VK5WTF and Mark VK5QN stepping in to give us a hand. Also on site was Mark VK5QI (Payload), Grant VK5GR (Balloon) and Will VK5AHV (Balloon). The team laid everything out and commenced assembling both the balloon train and the filling apparatus.

At the same time, Grant VK5GR started up his frist time chase vehicle and coaxed all of the linked software systems to life. Thanks to some loaned antennas from Matthew VK5ZM and LoRa receivers from Mark VK5QI, Grant was able to establish a full telemetry and tracking suite in just a matter of days to help assist with the chase.

Marcus filmed the proceedings too and you can see a short timelapse here of inflating the balloon.

Meanwhile, Mark VK5QN and Mark VK5QI (yes that did get confusing) assembled the balloon train. Mark VK5QN with his climbing and scouting background did a professional job of tying the balloon train together. You are most welcome to come again Mark!


Finally the time came for liftoff. Mark VK5QI checked in with ATC Melbourne and we were given our clearance to fly. The team raised the balloon train and was thankful that we had almost zero ground winds. Mark did a final check that all the payloads were transmitting using a new handheld flight status monitor he had been working on and gave the the green light to commence countdown.

Grant VK5GR then released the balloon and we witnessed a near text book launch. As it climbed, the balloon hit it’s ascent target speed of 5m/s and everything looked good for a successful flight. The ground teams then scrambled to pack everything away and get rolling. It was going to be a long chase, with the landing zone predicted to be up in the north eastern Barossa Valley, and a detour around the River Murray required past Bow Hill and up to Blanchtown so that delays on the river car ferrys could be avoided.

Tracking Control

Meanwhile 58km to the north west, the ground tracking crew of Peter VK5KX and Darin VK5IX were awaiting signal aquisition as the balloon cleared the horizon. They had lots of signals to track this flight, including the 100 Baud RTTY, the LoRa Telecommand system and two Wenet Imaging payloads. Peter again setup his automated tracking antenna (seen on the previous week’s flight) and with Darins help was able to collect and upload to the internet the image signals from both payloads.

Peter took the following video of the Wenet systems in action

The Chase

Meanwhile, back in the two chase cars, Marcus VK5WTF, Mark VK5QI and Will VK5AHV headed out first and made the dash up to the valley.

Mark VK5QN and Grant VK5GR had a slightly slower start, as they had to first drop the gas trailer at a staging point in Younghusband before they too could join the chase.

Wenet Images

This was the first time the balloon and been flown this far NE of Adelaide so it was great to see some different angles of the state. The weather was nearly perfect as well with hardly a cloud in the sky. These photos were taken by the AREG Wenet payload with an outward facing camera.

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One of the last photos actually captured a shot of Mark VK5QI’s chase car as the team was fortunate to be in visual range of the landing.

Grant’s team wasnt quite so lucky due to a software issue involving timezones and the prediction tools and he didnt make it to the landing zone until about 5 minutes after it landed.

Once the balloon landed, both teams met up with the local land owner before being given permission to drive in and pick up the payloads. We were very lucky that the balloon landed approximately 100m from the access track in an empty stubble field. Definitely one of the easier recoveries of recent times!

After we bid farewell to the land owner it was off back home – of course via another bakery (this time in the main street of Truro). Mark’s chase team had the luxury of being able to head straight back to Adelaide. Meanwhile Grant had to return to Younghusband to pick up the gas bottles and trailer. For the VK5GR team it was nearly a 600km 10.5hr round trip this time.

Flight Path & Statistics

Horus 47 flew an interesting course this time. This is a rather uncommon flight track for the AREG team.

The flight statistics are below

Flight Designation:Horus 47 - SHSSP18 #2
Launch Date:04/2/2018 23:59:04 UTC
Landing Date:04/2/2018 02:19:52 UTC
Flight Duration:2 Hours 30 Minutes
Launch Site:-34.878614 139.492314
Landing Site:-34.313174 139.107985
Distance Traveled:72.7 km
Maximum Altitude:32,507 m

Again many amateurs from across the state got involved in telemetry collection. We wish to thank everyone who took part as you all help make the chase and recovery more successful.

The following is the chart of who contributed to the telemetry gathering effort:

Thanks goes to the following who contributed: VK5QI, VK5KJP, VK5ST, VK5NEX, VK5EU, VK5APR, VK5KX, VK5GR, VK5FTAZ, VK5ZAI, VK5DJ, VK5FAAP, VK5ZEA, VK5ALX, VK5KIK

A few stations also contributed to receiving the Wenet digital imaging downlinks. These stations were:

SHSSP1 Payload

  • VK5APR: 145509 packets (35.52 MB)
  • VK5WTF: 91884 packets (22.43 MB)
  • VK5EU: 146129 packets (35.68 MB)
  • VK5DSP (UniSA Team): 133871 packets (32.68 MB)
  • VK5KX: 99419 packets (24.27 MB)

VK5ARG Payload

  • VK5QI: 198691 packets (48.51 MB)
  • VK5KX: 185197 packets (45.21 MB)


So that marks the end of the story for the Southern Hemisphere Space Studies balloon launch program for 2018. We hope everyone had a great time and again thank everyone who contributed or participated in making the flights possible!

73 till next time de VK5ARG

Acknowledgements: Thanks to VK5QI, VK5QN, VK5GR, VK5WTF, VK5KX, VK5IX, VK5AHV and SHSSP for all the material in this report.

Horus 47: Set to Fly on Sunday 4th Feb for SHSSP!

After the successful Southern Hemisphere Space Studies Program publicity flight last week, we are now planning to fly the Science flight this coming Sunday. This flight has two main experiments on it, the first being a Spectrometer which will collect atmospheric composition data for the university and the second is a downward facing camera with a 9DOF inertial measurement unit which is going to be used to create stitched together images from the flight area.

The flight will lift off at 10:00am ACDT on the 4th of February from Younghusband in the Murray Mallee ~150km east of Adelaide.

UPDATE 2018-02-05: This launch has been performed and was recovered successfully – a full writeup is incoming… 

Payload Telemetry Details

As always amateur radio operators from across central and SE Australia are encouraged to get involved with telemetry reception and forwarding to the central habhub.org database.

There are two camera payloads as well as the RTTY and telecommand systems planned for this flight.

  • Primary:      434.650MHz RTTY 100 baud 8N1
  • SHSSP-1:   441.2MHz FSK 115k2 baud Wenet (downward facing camera)
  • VK5ARG:    443.5MHz FSK 115k2 baud Wenet (outward facing camera)

Information on how to receive, decode and relay the information is available as follows:

RTTY Payload

The auto-configure feature within dl-fldigi will automatically configure these settings for you once you pick the correct flight (“Horus 47 / SHSSP 2018 MkII”). The UKHAS tracking guide provides the information you need to set up a RTTY receiver:   https://ukhas.org.uk/guides:tracking_guide

WENET Picture Payloads

Information on setting up to receive the Wenet imaging payload is available here: https://github.com/projecthorus/wenet/wiki/Wenet-RX-Instructions-(Ubuntu-Debian)

Note that this is a few orders of magnitude more complicated than setting up for RTTY, and requires a machine running a recent version of Ubuntu, some Linux experience, and a RTLSDR+Preamp. You also need to be within 100-150km of the balloon to receive sufficient signal.  If you have a WENET capable ground station please concentrate on the 441.2MHz downlink to maximise the data we collect for the university.

Tracking and Viewing Information

If you want to follow the progress of the flights, you can visit www.habhub.org and access the live tracking information as events unfold. You can also access the live SSDV images  from ssdv.habhub.org/VK5ARG

The predicted flight path at this time is:

Keep watching the AREG Website for details as things can always change the closer we get to lift off.

Horus 46: International Space University – Jan 2018

The Amateur Radio Experimenters Group teamed up again this year with the International Space University’s Southern Hemisphere Space Studies Program to simulate a space mission using Helium fueled high altitude balloons.

The Southern Hemisphere Space Studies Program is an intensive, five week, live-in experience built around an international, intercultural, and interdisciplinary (3 “I”s) educational philosophy for which the International Space University (ISU) is renowned. The program provides a multidisciplinary understanding of the key activities and areas of knowledge required by today’s space professions, including:

• Space science and exploration
• Space applications and services
• Human spaceflight and life sciences
• Space systems engineering and technologies
• Space policy and economics
• Space business and project management and
• Space law and regulatory issues

The Balloon Mission – 2018

The original plan was to fly a multi-faceted ‘heavy’ mission that included downward as well as outward facing cameras, inertial measurement units reporting the camera orientation (so that the photos could be plotted and stitched together after the flight) and a spectrometer studying atmospheric gas makeup.

Unfortunately the weather was not cooperating, with flight paths landing in severe bush-fire rating zones within the Adelaide Hills, a risk the AREG team were not willing to take. So, at the 11th hour, the plan was re-cast to collect only outward images, without the flight termination devices on board, using disposable payloads. Thus, Horus 46 was born and flew on the 28th of January.

Predicted Flight track before launch

The Launch


(Video provided by Timothy Ryan @AstroTimOz)

The launch teams arrived at Serefino WInery at 8.00am and by 8:10am we had selected the launch and tracking sites. This year, due to the very calm ground winds we were able to lift off from the front lawns. The SHSSP students then helped with preparing the flight and filling the balloon. Grant VK5GR led the filling operations, aided by Josh VK5JO and WIll VK5AHV  while Mark VK5QI tended to the payloads, Peter VK5KX and Bill VK5DSP tended to the ground station receivers and Matt VK5ZM (club president) secured the balloon train and handled the publicity aspects of the event for AREG.

Telemetry and Images

Telemetry collection was vitally important for this flight as it represented about the only way that we were getting pictures back from the balloon. To this end, we again enlisted the help of Peter VK5KX and Bill VK5DSP who provided the primary image downlink stations for the day.

Mark VK5QI’s X-Quad antenna from Wimo generated a lot of interest as well as the tracking rig which now takes GPS data from the telemetry and computes the correct azimuth and elevation to aim the antenna at to receive the balloon. Lots of work went into that system by multiple club members so it was great to see it out in anger.

Back in Adelaide, Peter VK5APR and Graeme VK5EU also made major contributions. The Wenet telemetry scoreboard in the end was:

  • VK5KX: 275015 packets (67.14 MB)
  • VK5APR: 153431 packets (37.46 MB)
  • VK5DSP: 13682 packets (3.34 MB)
  • VK5EU: 89418 packets (21.83 MB)
  • VK5QI: 200777 packets (49.02 MB)

Tracking the RTTY payload required some finesse this time as it was an original Micronut complete with AFSK spacing and frequency drift issues of old. None the less multiple stations were able to contribute to the flight data collection.

What the Balloon Saw

The most spectacular aspect of any of these flights are the pictures collected from the high altitude cameras. These never get old and this flight did not disappoint.

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(Slideshow from the flight)

The final flight track looked as follows

The flight stats are as follows:

Flight Designation:Horus 46 - SHSSP18 #1
Launch Date:27/1/2018 23:39:30 UTC
Landing Date:28/1/2018 01:58:43 UTC
Flight Duration:2 Hours 19 Minutes
Launch Site:-35.22103 138.55374
Landing Site:-35.38075 139.1722
Distance Traveled:58.8 km
Maximum Altitude:21,213 m

Attempted Recovery

As with all flights, there is a degree of uncertainty. So with Horus 46, while the expectation was that we wouldn’t be recovering this one, none the less an attempt was going to be made. Mark VK5QI set out with Will VK5AHV to track and attempt recovery anyway.

For a while it was looking positive, but alas this balloon “exceeded specifications” in a most annoying way. It flew higher than planned, in fact nearly 4km higher, which shifted the final landing zone well and truly into the waters of Lake Alexandrina.


A big thank you is again owed to everyone who contributed to the flight either through direct flight operations or through telemetry gathering. Stay tuned as we are still hoping to fly the main scientific payloads next weekend (weather permitting).

Horus 46 High Altitude Balloon Launch Sunday 27th

 The Amateur Radio Experimenters Group has been again asked to support the Southern Hemisphere Space Studies Program for the International Space University in 2018. Held in conjunction with the University of South Australia in Adelaide, this year AREG is launching one balloon for the group carrying a variety of sensors and cameras. The students this year are focusing on space navigation and will be attempting to take the GPS and 9DOF orientation sensor data from the payload to pinpoint where in space the photos were taken from, and then overlay them like a checkerboard over the ground.

The flight will lift off at 10:00am ACDT on the 28th of January from Serefino Winery east of McLaren Vale.

Tracking of the flight will be available on the HabHub Tracker, available at this link. (Note that other balloon launches will also be visible on this page, including the Bureau of Meteorology launches from Adelaide Airport).

Live Imagery from the launch will be available at this link: http://ssdv.habhub.org/VK5ARG

Payload Telemetry Details

UPDATE: Due to the weather, there is now only one camera payload (as well as the RTTY and tele-command systems) planned for this flight, with a much lower planned burst altitude (~17km instead of 30km). This is because of the flight path and recovery concerns in the face of Severe fire-ban and harsh weather forecasts.

  • Primary Telemetry:   434.650MHz +/- 5 KHz RTTY 100 baud 8N1
  • Imagery Payload:   441.2MHz FSK 115k2 baud Wenet

As always we can use the help with receive stations copying the telemetry and pushing this to the internet for us. If you have a Wenet capable ground station please concentrate on the 441.2MHz downlink to maximise the data we collect for the university.

The auto-configure feature within dl-fldigi will automatically configure these settings for you once you pick the correct flight (‘Horus / SHSSP 2018’). The UKHAS tracking guide provides the information you need to set up a RTTY receiver:  https://ukhas.org.uk/guides:tracking_guide

Note that the RTTY payload on this launch is one of our ‘vintage’ MicroNut payloads, and is expected to drift a few kHz during the flight. dl-fldigi will keep track of the signal if it’s within your receiver’s passband, but you may need to re-tune during the flight.

Information on setting up to receive the Wenet imaging payload is available here: https://github.com/projecthorus/wenet/wiki/Wenet-RX-Instructions-(Ubuntu-Debian)

Note that this is a few orders of magnitude more complicated than setting up for RTTY, and requires a machine running a recent version of Ubuntu, some Linux experience, and a RTLSDR+Preamp. You also need to be within 100-150km of the balloon to receive sufficient signal.

The Flight Path

This flight is not ideal as it is landing in the Adelaide Hills, an area that can make recovery difficult for multiple reasons. The planning group are watching this very closely.

A note on the Weather

With the weather in the high forties this coming weekend if the CFS issue a Severe or higher fire ban on Saturday at 4pm then the flight will be scaled back or cancelled. It is possible a light weight disposable flight may still run (without the expensive scientific payloads) so we will still be looking for tracking. It all depends on the flight path and the fire ban status issued by the CFS. A final call will be made Sunday morning and will be posted to the AREG Website before launch.


Next Meeting: Chasing DX (or how to work 3Y0Z)

Welcome to 2018!

The Amateur Radio Experimenters Group Monthly Meetings are starting up again with one of our Beginners Series  of talks, but this one will have a twist. We will be running it as a panel discussion with the topic “HF Operating Etiquette – How to Work 3Y0Z”, and wish to invite all of the active DX chasers and HF operators in the room to share their collective thoughts on what to do and what not to do when chasing HF DX in general.

The aim is to spread the collective knowledge about how to get through those piles for that special ATNO (All Time New One) like the Bouvet Island DXPedition (#2 on the most wanted list). Topics will be guided by moderators and will include HF operating etiquette, how to work HF split, how, when and where to call in a pileup, what to consider propagation wise and much more.

We will have a live scribe taking down all of the best ideas and will post them here after the meeting for future reference.

Where and when is the meeting?

Friday January 19th – 7.45pm (for an 8.00pm start)
Fulham Community Centre, Phelps Court, Fulham.

Visitors are most welcome to come and participate in the evening. We hope to see you there!


Adelaide Rally using VK5RSA / VK5RSB Repeaters

WICEN has approached AREG to help with their communications nets during the Adelaide Rally this year on the 7th,8th and 9th of December. For the most part, WICEN will use the VK5RHO Ansteys 2-meter repeater (146.850) but for 2 other stages they are requesting to use the VK5RSA 70cm repeater (438.025). AREG is very supportive of this type of use of the club repeater assets and so naturally has agreed.

The times and stages are:

  • Thursday – Old Norton Summit (approx 2:30pm till 5:30pm)
  • Saturday – Norton Summit (approx 12:30am till 5:00pm)

WICEN may also require access to Summertown VK5RSB (439.900) as a possible backup for a Saturday afternoon stage.

WICEN’s role is backup communications and radio traffic should be minimal.

Amateurs who hear the rally traffic on these repeaters are asked to give WICEN priority access during the event. Your cooperation is greatly appreciated!

High Altitude Ballooning: Willunga HS Supported by Project Horus

The Willunga High School is planning to launch a high altitude balloon, planned for this Thursday, the 7th of December. Launch time will be around 10:30 AM ACST. This flight is being carried out by the teachers at Willunga High School.

While not a direct Project Horus Flight, it is being supported by the Project Horus team with tracking payloads, recovery services and telemetry feeds. Amateur Radio operators from across the state are invited to contribute to the telemetry collection activities which will use the same Internet resources as Project Horus does.

Flight Predictions

The predictions are a bit variable – there is a weather change coming through Thursday & Friday which are throwing things out. As of Sunday 3rd December’s model the balloon is landing somewhere near Ki-Ki, but this is expected to change. If the predictions change markedly, the launch may be rescheduled to Friday.

Target burst altitude is 30km, but depending on predictions the flight may be cut-down early to ensure a safe recovery.

The radio payloads on this launch are currently planned to be:

  • RTTY Telemetry – 434.650 MHz
  • Cutdown / Mission Control payload – 431.650 MHz
  • Wenet Imagery on 441.200 MHz

As usual, assistance with tracking is greatly appreciated.
Information on tracking the RTTY payload is available here: https://ukhas.org.uk/guides:tracking_guide

Live tracking of the flight will be available on the HabHub Tracker: https://tracker.habhub.org/#!mc=-34.8,139.0&mz=9

Finally, if we can get enough packets down from the Wenet payload, live imagery will appear here: http://ssdv.habhub.org/VK5ARG

More news as we get closer to the day!