A wonderful weekend of JOTA

What a difference a week makes, last week I was feeling somewhat low and as a result ducked out of the RSGB convention as I wasn’t feeling very sociable.

But this week I had to get my head straight since the South Kesteven ARS (of which I am Chairman) were involved for the second year in the Scouting Jamboree on the Air (JOTA) weekend operating GB5FSG for the 1st Foston Scouts.

But before that we were also involved with another local scouting group, the 1st Barrowby where we assisted in a class of 12 Cubs with their communication badge.

Together with Stewart (M0SDM), Sean (2E0ENN) and Konrad (2E0KVF) we spent an evening giving them a introduction to amateur radio. Konrad who is an ex-scout leader explained the hobby, Stewart and Sean helped them pass messages via a radio. There was also a timely visible pass of the International Space Station during the evening and I hoped they might be able to see it while I demonstrated transmitting APRS messages via the onboard digipeater.

Using my new dual band Yagi, laptop and FT857D in the boot of my car I did successfully get messages digipeated and igated however the cloud and rain prevented the cubs seeing the ISS pass overhead (I put the coordinates in slightly wrong, so are shown slightly south of where we were)

The evening was a great success and the enthusiasm shown by the Scout leaders hopefully means SKARS will be involved in more activities for the Barrowby Scout group. Interestingly we were not the first local club they approached to assist but after they were given the cold shoulder by them we were happy to take up the challenge. The Barrowby group were also interested in being involved in the Jamboree on the Air (JOTA) next year.

So on to the main event this week, the GB5FSG JOTA station, operated by Stewart, Sean and myself. It is exactly a year since I gained my full licence and this was my first Notice of Variation for a special event station, last year under the previous chairman we had run GB2FFC with some success but this year we hoped to improve the experience for the Cubs/Beavers and Scouts.

Firstly we had a much improved antenna installation, with Stewart’s Land Rover and impressive pushup mast we had an excellent OCFD dipole, resonant on several bands including 40m along with another smaller pole holding up an end fed long wire for the datamode station. We also put up a collinear for a 2m VHF station.

Last year we were hampered by the noise of excitable children in the main room of the scout hut which made operating and hearing contacts difficult. This year we asked for some separation from the hubbub and had planned to use a tent. Instead we setup in the storage area in the back of the hut which proved ideal as it allowed us to control the number of children and allowed easier working conditions – it was a little chilly but much warmer than a tent would have been.

On Saturday we used Stewart’s FT897 as the main HF rig, Sean operated a 2m meter station with a number of contacts. Like last year I had my FT857 operating a datamode (primarily PSK) but a damaged feeder issue curtailed this for most of the day and we soon concentrated on the HF SSB voice contact as conditions were good and the band was busy with other JOTA stations.

In keeping with the aims of JOTA we didn’t chase numbers instead we had some lengthy quality contacts, including a marathon 30 minute plus contact with I believe was GB2WSG the 2nd Wellington Scout Group with lots of two-way greeting messages being sent to really give the children a full experience of using the radio.

The day before I had quickly constructed a Morse code oscillator (since I didn’t have one) using an arduino board and an old computer speaker for added volume and this proved popular as the children tapped out their own names, their friends names, call signs, their ages and various words.

I had created some certificates and stickers to reward the children and to prove they had completed the tasks should they need them for any future scouting badges and awards.

Sunday we just operated for the morning and since Stewart couldn’t attend I brought along my FT450D and Sean and myself operated on HF SSB. Sadly my poor Morse oscillator failed quite spectacularly in a puff of smoke but all was not lost as again conditions were excellent and we were able to pass lots of greeting messages again. I haven’t used the FT450D in anger so it was excellent to let it stretch its legs and the audio and DSP proved excellent in dealing with the QRM from the contest running at the same time.

Working with the Scouts this week has really was a therapeutic exercise for my soul and made me glad I got licenced and was able to get involved with this. I am not naturally comfortable with children, since I am not a parent. But it was rewarding seeing the look of wonder on some of their faces as they passed messages.. like it was magic 😉

Black Dog Days

This time last year I was preparing to take my advanced licence exam at the RSGB Convention (which I passed) and I vowed to attend this years convention proper.

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Unfortunately I have a had a bit of a wobble emotionally and despite having booked day tickets I have decided at the last minute not to attend.

The past few weeks have had plenty of euphoric moments, with the successful flight of my the high altitude balloon at the recent hamfest and my first satellite QSO however following these highs I have suddenly found myself in a bit of a low, this is due to a number of factors.

This isn’t the first time I have been in one of these dark moods. Sadly apart from my hobby, which has become a crutch I realise I am again stuck in a rut and I know I have to make a number of major decisions to put things back on track.

 

My first RAYNET event

Sunday I took part in my first RAYNET event at the Walk for Parkinson’s at Burghley House in Lincolnshire. This was a sponsored walk to raise money for Parkinson’s UK a research and support charity working to help find a cure and improve life for those affected by Parkinson’s disease.

Starting at the Burghley House stately home, participants could chose to do either a gentle 3 mile stroll within the grounds or a more challenging 10-mile walk out of the park and through the Barnack Hills and Holes National Nature Reserve.

RAYNET’s task was to provide communication support to the organisers with operators situated around the course at various marshalling points to pass messages and if necessary request assistance.

Earlier in the year there was a presentation about the work of RAYNET at the South Kesteven ARS by Jim Wheeldon (M0JHW) and Alan Clarke (M0NLR) after which I’d offered my services for future events, so when Jim called me and asked for some help I was happy to oblige.

My task was quite straightforward, simply manning one of the marshal points along the course directing the walkers and making sure they were happy and injury free, if not I was to call for assistance. Despite being under the weather for the last few days with a bad head cold and a painful sore throat I still turned out and really enjoyed helping.

It was nice to use my radio licence and equipment for something useful, spending a pleasant morning in the sunshine talking to the walkers and some local residents explaining all about amateur radio.

RAYNET was formed back in the 1950s following the East Coast floods to provide a way of organising the valuable resource that Amateur Radio is able to provide to the community. While it is called the Radio Amateurs’ Emergency Network the majority of its work nowadays is to provide support to community events, like the sponsored walk.

However it can still be called up to offer assistance at incidents such as the recent Shoreham Airshow plane crash. The South Sussex RAYNET group, assisted by members of South Kent RAYNET, were already providing communications support for the organisers and the user services at the airshow when the Hawker Hunter aircraft crashed into vehicles on the A27 during a flying display.

It was reported that following the crash the area was in lock down in four hours and it the demand on the local mobile networks by concerned spectators, residents and residents outstripped capacity making normal communication difficult. RAYNET operators were able to provide much needed support in the aftermath.

Made my first satellite QSO

As well as flying a high altitude balloon another of my aims this year was to finally make a satellite QSO. Pleased to say last night I finally achieved it!

Last month Abdel Mesbah M0NPT chairman of the Hucknall Rolls-Royce ARC came to South Kesteven ARS to give an informative talk on operating amateur radio satellites. Abdel was the first UK operator to receive the AMSAT-UK 73 on 73 award for making 73 confirmed contacts via the FUNCube satellite AO-73.  http://amsat-uk.org/2015/01/28/abdel-m0npt-73-on-73-award/

Abdel explained all the current active satellites, how to work through them and gave hints and described techniques for achieving success on this more challenging mode of operation.

Spurred on I opted to target the SO-50 satellite which until very recently this was the only satellite carrying a FM transponder. The satellite receives on 145.850 MHz and retransmits them on 436.800 MHz (+/- 10 kHz Doppler shift). Operation requires the use of CTCSS (PL) tones of 74.4 Hz which starts a 10 minute timer and then a 67 Hz tone used for the contact. More details of how to operate and a video are on the AMSAT-UK website

I initially tried using just a suitably programmed Baofeng UV-5R with a NA771 whip and could clearly hear the downlink on higher passes, I called a few times with no luck.

I hadn’t monitored SO-50 much before and sadly it seems to suffer from very poor operating, with stations calling over contacts in progress, or stations continually calling CQ CQ seemingly oblivious to any reply and those that just keep calling “hola hola hola” for whatever bizarre reason! I would be lucky to get through the QRM with just the whip so I needed a better antenna.

Despite being extremely busy at the National Hamfest last weekend I did manage to get hold of a dual band Yagi that was reasonably lightweight for hand held use and capable of being easily dismantled for transporting. (The Moonraker YG27-35 Dual Band) it has a single feed point and two adjustable gamma match sliders and was easy to adjust using my analyser.

It has a single feed and I tried it with the Baofeng and reception of the downlink was excellent, again on a couple of passes I tried answering calls with no success.

Last night I decided to try again but with the FT-857D set at 10W output. I put it on a small workbench in the garden and powered it from my portable SLA battery. I ran split operation with the 2m Tx VFO set at 145.850MHz with 67Hz CTCSS, the 70cm Rx VFO set at 436.800Mhz I was able to adjusted it down in 5kHz steps during the pass. I got the wife to take a picture while I was operating.

As I started to hear the downlink I heard Abdel M0NPT calling and answered him, I was shocked when he came back and we exchanging details – that was it I had made my first QSO via an amateur radio satellite! Then amazingly other stations started calling me and I was able to also work DO2SYD.

I did manage to record it on a small dictaphone (did have a bit of a brain fade with my callsign at one point!)

I could get hooked on this…  There is also the new LilacSat-2 (CAS-3H) satellite with a FM transponder to try to work!So much to do, so little time…

Hamfest Balloon – Some analysis

It has been five days since PINKY and PIGLET had their successful flight into the stratosphere. I have been studying the telemetry data and the photographs. I am really pleased with them but it makes the failure of previous Eggsplorer-1 mission to get any wow images more painful.

I contacted some local and national newspapers about the flight but with little response. The Register IT news website did put an article on http://www.theregister.co.uk/2015/09/28/pigs_in_spaaaace

I checked out the telemetry statistics on http://habitat.habhub.org/stats/ and was impressed with the number of people who tracked (as can be seen in the pie chart below) I know that several interested parties have since visited the UKHAS wiki and have been asking questions on the IRC channel on how to do a flight and/or develop their own trackers. Naturally I have also been thinking about some possible future flights.

While the novelty of flying something into space, be it a toy pig or an egg is satisfying I would like to make any future flight serve some purpose, whether collecting more data or ideally doing some experiment with radio even if it within the constraints of the UK draconian regulations when operating in the air!

One set of data I did extract was the temperature profile during the flight. PINKY had two sensors, one internal to the Styrofoam box, the other external. PIGLET also had a temperature/pressure sensor but it was giving odd readings during the flight so have ignored that.

The graph shows internal/external temperature recorded by PINKY against altitude, there are two plots for each showing the ascent profile and the decent. The lowest temperature recorded by the external temperature was -49.5°C   (-57.1°F) and the foam did a good job of insulating the internal electronics, though it drop below 0°C during the decent.

One thing I will do on the next flight (if it happens) is take a lot more photographs, using a 32GB memory card I could have held a lot more images. Also I will look at embedding the GPS coordinates (geotagging) into the image files.

I will also put on board a video camera, I did purchase a cheap dash cam type for £20 one off eBay for the Eggsplorer-1 but didn’t use it because of sea-landing, I need to sort out powering it as the internal battery wouldn’t last for the duration of the flight.

I have still to investigate the issues with the LoRa as to why it failed. This weekend Dave Akerman is flying three balloons in succession with LoRa tracker modules. They will be set up to work in a mesh, receiving and repeat each others telemetry. Sounds an interesting experiment, I will have to set my LoRa gateway back up and attempt to receive them.

Hamfest HAB Flight – Mission Debrief

The National Hamfest high altitude balloon flew on Saturday and Pinky Pig reached a maximum altitude of nearly 26km (25,927m / 96,873 feet) as pictured above.

The flight originally planned for Friday had to be postponed due to wind direction and restrictions but I had sort approval for both days and was able to fly on Saturday. The conditions were perfect on launch day, clear blue sky with little cloud and almost no wind.  Flight prediction put it landing around 25km away.

Both payload trackers worked flawlessly, PINKY the high speed RTTY successfully sent SSDV as well as telemetry and the backup tracker PIGLET sent the slow speed RTTY telemetry. Trackers from all over the UK as well as France, Holland and Poland received data and uploaded data to the UKHAS website.

The received SSDV images can be seen at http://ssdv.habhub.org/PINKY

The flight path can be seen below

The flight can be seen visualised in Google Earth below and while the 26km altitude was impressive it was around 4km less than I’d planned.

 
The launch certainly created a great deal of interest at the Hamfest, on the Friday we setup the club tent for South Kesteven ARS with a tracking station and demonstrated the payloads to interested visitors. Stewart (M0SDM) used his Land Rover with a push up mast for a pair of collinear X-50s so we could receive and decode.  The mast and the Land Rover generated just as much interest.

 

On the Saturday I was assisted by my brother David (M6GTD) and just before noon began filling the balloon watched by a large crowd, as can be seen on Dave’s (M0TAZ) blog http://m0taz.co.uk/2015/09/national-hamfest-2015/
Picture by Dave M0TAZ
Once filled to give the correct lift I sealed it off and checked everything was working then without a breath of wind slowly let the balloon rise, taking the weight of the payloads and once I was sure there were no aircraft flying nearby I let her go. The sky was clear and the balloon went up near vertically and could be seen for quite a long time as it ascended. Representatives of the RSGB and RadCom were in attendance to take photos and did a quick interview. 
The tracking station was then full of people as the telemetry and pictures started to be received. It was great to see the huge interest in the balloon. 
As the balloon started to near the planned maximum altitude I began to get ready to set off to recover it then suddenly I was told it had burst sooner than expected. I got a hurry up at which point the laptop and mobile connection decided to stop working! However I knew where to head off with my poor brother trying to sort it out as I drove.
Stewart telephoned and gave me directions of where the live prediction and tracking had put the landing spot. My wife also set off from home to come and assist. In the car we were receiving a signal but were struggling to decode and couldn’t get on the internet to check the tracking. 
I eventually pulled up near the landing zone, while trying to decode the weak signal another car pulled up with two radio amateurs who had been tracking the balloon. I was a little preoccupied and they eventually said they were off and wished us luck. I then realised we were the wrong side of the hill and turned around and drove up to the top and the signal strength increased.
Stewart had phoned to tell me to find the Viking way footpath, as we reached ground zero we saw the other amateurs car and they were setting off down the footpath! It was my flight I wanted to be the first to find it!
My wife then pulled up and was about to set off after them! Then I started getting successful decodes! With the new landing position in the GPS my wife raced off in hot pursuit as I sorted out the car and then followed her with my brother. It was a reasonable walk of around 800m and as we got near it became apparent the other team had been using the online tracker and had only got the last received position which had been sent from around 254m altitude. However the payload was still transmitting strongly and we were decoding it and it was reporting it was in fact at 115m altitude – they were therefore several hundred meters in the wrong direction.
Our accurate location gave us the edge and a quick hop up a bank into a stubble field and a 200m jog my brother spotted the parachute… we had found Pinky and Piglet and got there first!
 I was surprised to find most of the balloon still attached, it hadn’t so much burst as split in a single tear
  
The payloads had no damage, other than the antenna being bent by the landing
PIGLET had landed as planned and tested, I had put the battery pack at the top of the box the top heavy center of gravity causing it to roll on landing so the antenna would be upright. It was in a perfect orientation hence the strong signal.
The other chase team turned up and congratulated us then left…  my apologies but I was in my own little happy place to be sociable. We then then had the obligatory team photograph before setting back to the Hamfest.
It has been an excellent experience and adventure.  The pictures are better than I could have hoped for! Thanks to my understanding wife, my brother David and Stewart for setting up the antennas for the tracking station and manning it on his own while we went off to recover the payload.
Thanks to the organisers of the National Hamfest and Graham Boor (G8NWC) for asking me to do the flight and helping fund the venture and I hope it succeeded in publicising the event and the hobby.
I have now downloaded all the photographs from the onboard camera and they can been in my Flickr album at https://www.flickr.com/photos/nerdsville/sets/72157658732989849
Updated – I realised I didn’t put the actual landing position on this post, so here it is

Hamfest HAB Launch likely to be postponed to Saturday

Given the latest flight path prediction, weather forecast and approval restrictions I will unfortunately have to likely postpone the National Hamfest high altitude balloon till Saturday.

The forecast for tomorrow is strong gusty winds at ground level which isn’t ideal for launching, but that is the least of the issues.

The current flight predictions for tomorrow are not good. The prediction model used is accurate and for the size of balloon I have and the amount of helium at my disposal even a maximum fill giving the maximum ascent rate and assuming the calculated decent rate for the parachute it is still putting the likely landing right on the coast. Earlier in the week the landing wasn’t quite as marginal but as the model’s data set have been updated it has drifted further eastward, it is odds on it will actually land out to sea.

However the real show stopper was when I received the CAA approval for the launch this morning. They have put a restriction not permitting a launch if the balloon and payload is likely to go on a North Easterly or Easterly path that could interfere with operations on local military airfields.

This is the predicted flight path, generated by the CUSG Landing predictor at predict.habhub.org and the flight path currently goes directly over RAF Cranwell but not at a high enough altitude. 

Flight prediction for Friday

Saturday is forecast to be a much calmer day with a predicted path as shown below

Flight prediction for Saturday

There would be no issues with the airfields for that flight path and has the advantage of going almost straight up and landing close by.

Apologies to those wanting to track on Friday, but the situation is out of my control and I would be foolhardy to ignore the prediction and  it is very unlikely it will change significantly to allow a flight tomorrow so I hope you can all track on Saturday. I will still be at the Hamfest tomorrow with the equipment if you want to know more about what it is all about.

Hamfest HAB – Pre Launch Update

Not long now! Just three days left till the National Hamfest and hopefully the launch of my second high altitude balloon.

Balloon, parachute and helium have all been purchased and payloads have under gone final testing and have been put to one side ready for the flight which should hopefully be around 12pm on Friday 25th September.

The SSDV payload callsign PINKY will transmit on 434.575MHz USB RTTY 300 baud 880Hz shift ASCII-8 no parity 2 stop bits.

SSDV Test image

the backup telemetry tracker callsign PIGLET will transmit 434.150MHz USB RTTY 50 baud 380Hz shift ASCII-7 no parity 2 stop bits

They will transmit using the UKHAS telemetry protocol and can be tracked on tracker.habhub.org for information on how to receive and upload data to the tracking system visit the UKHAS wiki some information and useful links have been collated on the AMSAT-UK website

I was hoping to also transmit using the LoRa system, using the callsign PERKY. The transmitter had been successfully tested but a last minute gremlin has struck and it stopped working this weekend, I have been unable to locate the fault and suspect it is the actual module and with time being short have all but given up getting it working. If I do get it working it will be on 434.450MHz in Mode 1

PERKY seen working on SDR

PINKY & PERKY tracker

I have already detailed the PIGLET payload in an earlier post. The PINKY/PERKY payload is constructed on strip board and was originally meant to to be a prototype, hence the rubbish layout. I had planned to build a better laid out version but the tight time scale, stresses and demands of work, commitments with the radio club not to mention nursing the wife as she recovers from a major operation scuppered that plan. Being pragmatic I decided it didn’t need to be work of art to work! I have secured all the connections with hot glue and it has been drop tested several times.

“Pinky” pig will be the passenger on the day, donning his fetching headset. Getting him in the right position for the camera was tricky.

I am still waiting for the CAA approval, should hopefully get it soon. I have put in a request for both days of the Hamfest just in case, the latest prediction at predict.habhub.org shows if I get the fill right I might just escape a watery landing on Friday, however Saturday looks more promising at the moment – also the forecast for Friday at the moment also has strong gusty surface winds, which could make the launch problematic. I am still planning for Friday since conditions and predictions do change.

Friday prediction as of 22/09/2015

Saturday prediction as of 22/09/2015

I and other members of South Kesteven ARS will be in attendance with a tracker station on the day, so please introduce yourself and perhaps join the club?

Please don’t mention anything to do with other pigs in the news..

Hamfest HAB – “Pigs In Space” Preparations

Already a week into September and not long now till the National Hamfest where I and the South Kesteven ARS are launching a high altitude balloon launch subject to CAA approval. The documents have been submitted so just waiting for the nod.

The balloon and parachute have been purchased from Steve Randall (G8KHW) at Random Engineering, using the same size as I did for the Eggsplorer-1

I had joked about sending some “Ham into space” on this flight but following the smelly end to Eggsplorer-1 have opted to play it safe and avoid food! Instead will be sending up a toy pig (well a small squeaky dog toy)

Similar to the Eggsplorer-1 the main tracker will be a Raspberry Pi fitted with a camera and two transmitters.

The tracker is based on the “Pi In The Sky” code base/design by Dave Akerman (M0RPI) and Anthony Stirk (M0UPU) with some modifications since I am building on simple strip board using a different GPS module/interface and omitting any power supply monitoring.

On the Eggsplorer I used an old Pi Model B but was forced to butcher it to reduce the power demand by desoldering the network/usb chip. This time I am using a Model A+ which is smaller/lighter and has a much reduced power demand and with the locking micro-SD card socket will hopefully prevent a repeat of Eggsplorer-1’s failure mode.

PINKY & PERKY are progressing well, just waiting delivery of some strip board and they should be completed in the next day or so.

PINKY will be 300-Baud RTTY, sending telemetry along with SSDV image packets using the UKHAS format.

PERKY will be using one of the LoRa modules again sending telemetry and SSDV but with greater resolution and speed, but will require a LoRa receiver/gateway (see Dave Akerman’s website).

While the SSDV is attractive to tracker enthusiasts the high speed RTTY is more difficult to receive, so I will be flying a secondary ‘backup’ tracker. The use of a backup proved invaluable on the Eggsplorer when the main tracker failed.

PIGLET will be a 50-baud RTTY transmission with telemetry and should prove easier to receive.

I finished PIGLET at the weekend

Again built on strip board it is based around the ATMEL ATMega128 micro-controller using the Arduino system with a number of off the shelf modules connected to it.

It has one of the GY-GPS6MV2 GPS modules I blogged about last year feeding into the UART. The NTX-2B transmitter (frequency agile version from Hab Supplies) and a I2C BMP180 pressure/sensor module (not visible as mounted to measure external conditions) It also has a small boost converter to supply 5V and extract all the available power it can from the 3-AA lithium battery pack.

One change compared to the EGG1 tracker is to use a PWM output from the Arduino to generate the RTTY tones rather than a register voltage divider (guide here) which seems to give a cleaner signal.

The antenna is simply copper wire making a 1/4 wave ground plane. The ‘box’ are some layers of styrofoam glued together with UHU-Por with duct tape, some straws and beads for safety. Just needs the batteries fitting and the lid fixing with more duct tape and PIGLET is ready to fly.

Full details of frequencies will be posted nearer the time.

MADHEN Eggsplorer-1 – We’ve got the data!

Following the euphoria of the Eggsplorer-1 payload being found six weeks after launch washed up and retrieved from the beach in Terschelling, Netherlands it has been an agonising wait to see what the Dutch police would send back. My impatience got the better of me last week and I contacted them directly to be told that unfortunately due to the awful smell and condition of the box they had simply removed the memory card and had posted that back as requested.

More days past and I was beginning to think irony was going to play a cruel trick and the card after its fantastical journey would end up lost in the post. I shouldn’t have been so pessimistic as it arrived today! Along with the card was a detailed map showing the final location and labels from the side of the box.

There was a nice note from the police.

The SD memory card seemed to have had survived more or less intact, though there was some corrosion on the contacts and crucially a small corner of the card was broken off.

The plan was to use the Win32 Disk Imager program to make a direct raw image of the card and work on that copy. I first used a small wad of wire wool to gently clean up the contacts

I was encouraged when I inserted the card into my Microsoft Windows laptop and it was detected, however my heart sank when any attempt to access it or use the imager program was met with an error. I gave it another gentle going over with the wire wool and thankfully was then able to make a image file, the next stage was to extract the precious data.

The card of course contained the Linux based Raspberry Pi file system and in order to access it on a Windows machine I used the freeware linux-reader from DiskInternals which allows access to Ext2/Ext3/Ext4, HFS and ReiserFS file systems within Windows.

It was a simple case of using the “mount image file” option and the partitions were then accessible and everything appeared intact, there were images on the card unfortunately not the “egg in space” image I wanted, just some nice “egg in the clouds” shots.

The telemetry log file confirmed the worst, the flight computer had indeed stopped/crashed at approx 2.5km up and no further images had been captured of the 31km accent into the stratosphere (confirmed by the backup tracker) I had hoped the transmission had stopped because of a fault in the antenna or the radio module board alas this wasn’t the case.

On the day of the launch I did have problems with the payload not booting up. It had worked flawlessly under test the previous weeks and I had secured everything in the box ready for the flight. The day before the launch I had spotted there was another balloon going up in the UK at the same time and we had both opted for the same frequency. So at the eleventh hour I was forced to take out the SD card to change the configuration to prevent the transmission clash.

The launch day start up problem was the SD card. I had removed and reinserted it to get it to start up and secured it down with plenty of gaffa tape. Looking at the card now and the fact the broken corner is old damage I am convinced this is the reason for the failure as the card may well have become dislodged due to turbulence.

While slightly disappointed it is still a miracle I have any images at all and can only thank Jan and the Dutch Police again.

I have certainly learned a lot and hope the National Hamfest HAB that I and South Kesteven ARS are flying is more successful