Category Archives: Balloon Recovery

WX Sonde

A short sharp and shiny post !

There’s been a clear increase in interest in tracking and chasing the Bureau of Meteorology radiosonde launches here in VK5. Many have been tracking these on and, and there have been quite a few new faces sighted near sonde landing locations!

to this end, I have set up a mailing list where items such as RX ground stations, chasing, and chasing co-ordination can be discussed.  This will also help avoid situations that have been encountered recently, where people have travelled quite long distances to find a sonde has already been recovered.

If you are an active RX station or a chaser we would encourage you to subscribe to the VK5 WX Sonde list.  All new members need to be approved before posting, and that will usually be done within a day or so.

For those new to this activity, the following resources will help:

Launches out of Adelaide occur twice a day, at 8:45 AM and 8:45 PM. The automatic sonde receiver stations usually detect the sonde shortly after launch, and upload telemetry to the HabHub Tracker (!mt=roadmap&mz=7&qm=6_hour&mc=-34.13946,138.42875 ).
Mt Gambier launches occur on Mondays and Thursdays at 8:45AM. Launches are also performed from Woomera and Ceduna, though we don’t currently know the schedules for these sites.

The Mailing list was established so that the Various RX station operators can discuss any issues and or set-up hints and tips.  For the Chaser, the list can be used to co-ordinate and notify when you intend to chase and to notify  when you actually find a Sonde.

for something completely different

This morning had an interesting email that led to a pretty interesting day!

The email was from VK3YT saying that a pico balloon he had launced earlier in the week was coming down near our remote digi (vk5thb-1)

We had a few things that we should have been doing, thought about it for about 30 seconds and loaded up all sorts of gear into the car – we were going balloon chasing!


Andy sent the above image taken from the spacenear website  showing the track of the balloon and the predicted landing site along with the frequencies that the telemetry and timings etc were being sent by the payload.

We headed out and made our way to the predicted landing site as per the above image and waited around for 3 expected telemetry transmissions but heard nothing.

So, made our way back to the highway, closer to the last transmission point, again we heard nothing, so finally moved again.





We moved just north of the highway – and drove along a non-existent track, to near the “Red Dot” and finally managed to hear some telemetry on UHF.  We only partially decoded it and only got the Long – and not the Lat – so we were 1/2 way there.  But we  were also able to DF the signal and get a direction! Using a YNG sniffer and a 5 ele Yagi, not strong -but with the signal only being 10mw it was hopeful.


So we waited again and did not get a signal – the batteries were getting weak and the time between signals was increasing!


We moved, based on the direction of the DF’d signal and heard it at an S5 near the Red Mark, but didn’t decode the signal at all.

Given we had a strong signal at this point, we stopped the car, and just waited, and waited and waited.  Finally 30 minutes later, we got a signal, decoded the telemetry with the GPS co-ords in it.


We took a screen shot of the decoded Oliva 8-250 Telemetry we received on UHF – The IC-7100 in the car meant simply plugging the laptop into the radio and have the appropriate software loaded.

We punched the details into the GPS in the car, and drove to within 400M – the closest point we could get to.

We could see a silver thing on a fence and thought that it must be the balloon. So, grabbed a handheld with a GPS/APRS in in and started walking.  Sure enough, it WAS the balloon!

And I had actually spotted this on our first pass up the road on the way to the original predicted landing site and commented that maybe that was the balloon (approx 2 hours earlier).


Above photo was of the balloon on the fence, you can just see the string heading down to the payload.  The treeline in the background is the approx 500M  back to the road where we could drive to.


The balloon, looking along the string to the payload – which is there in the wet grass!


A zoom of the above photo – follow the string, you can just see the final resting place – You can just make out the yellow covering of the payload  and 1 of the Solar cells.


The actual payload, once I had moved it so I could see it!

The reality is, given that the final resting place was in wet grass, yes it was raining! and given that the antenna was entirely at ground level -we were pretty lucky to hear anything at all!

The first signals we got from it were around 3km away and very weak.  The final signals were from about 2km directly across an open paddock!

Well, Andy, this is one that got away and is going to come home!

Look at the details of the flight of PS-16.

It was a fun afternoon to assist another Amateur with the recovery of their experiment and will follow further launches.