The A35JT Expedition team left Australia this morning with a further 180+kg of gear and has successfully arrived with everything and everyone accounted for in Auckland New Zealand. We will overnight here before setting off for Tonga in the morning.
Author Archive: vk5gr
The A35JT DXPedition team has revised our frequency plan. It is going to be very crowded on the bands with up to 5 concurrent expeditions. We have reviewed all available data and have made some changes accordingly. Please see the latest information here:
|160m||1818kHz||1846kHz||1803kHz||1840kHz (1908kHz for JA)|
|80m (for JA)||3518kHz||3775kHz DOWN 5||3535kHz||3570kHz|
|6m EME||50185kHz JT65A|
On 6m EME look for us on: 50.203MHz
The team will monitor the DXClusters if possible and will further adapt the plan according to band usage. See you on air in about 4 days time!
Software integration of the logging agent has been achieved with our N1MM network (thanks to software from N2AMG) and testing under VK5GR has been completed. While it is all dependent on our internet access once we reach Tonga we have been advised that internet is available.
We had some great news today. Our antenna shipment has cleared customs and quarantine processes and is ready for us to collect on Monday! A huge thank you to Mary and all of the staff at Pacific Forum Line in Nuku’alofa as well as to the good folk in the Revenue and Customs Ministry who helped facilitate this on our behalf. We look forward to thanking you all in person for your help and support next week! Thank you also to Mala at Tayper Freight Forwarders back in Australia for handling this end of the shipment.
Meanwhile, back in Australia, two of the stations are packed into their travel cases and the third is being finalised now. The low band antennas and Spiderbeam 12m fibreglass pole were also packed today (they are flying in with us as luggage). The team is now getting excited to get out there and get on the air!
The A35JT DXpedition team wishes to extend our sympathies to the people of Tonga after the passing of their Prime Minister Mr ‘Akilisi Pohiva last Thursday in New Zealand. Our plans still remain unchanged to arrive in Tonga on Monday the 23rd of September. Due to the unforseen circumstances we ask the amateur radio community to be patient should we run into any complications upon our arrival.
So as to not leave South American amateurs without an easy way to contact the expedition, Ricardo PY2PT has agreed to take up the reigns. His details, as well as the contact details for all of our pilot stations have been updated on the pilot page of the website.
We reached another milestone today! 124kg of antennas left Australia bound for Tonga via New Zealand. They should be waiting for us in Nuku’alofa on the 23rd of September.
Good News! We finally had a chance to test the new 1kW 6m amp for the EME station! It works a treat and marks the final confirmation that we can still take 6m EME with us to Tonga (after the mishap with the original amplifier back in July).
A huge thank you to Peter VK5PJ who has donated a 50v 40a power supply to us for the expedition! Thanks also to Bjorn SM7SJR who sold us the amplifier and helped with part of the shipping costs getting it from Sweden to Australia.
We are now 30 days away from departing Australia and heading for Tonga. Excitement is building within our team including Oly VK5XDX, Steve VK5SFA, Andy VK5AKH and Grant VK5GR. Our operators have interests from all of the CW, SSB and Digital worlds so we hope to cater for everyone – propagation willing. Our EME equipment is packed too so expect to find us on 6m via the moon! We are also planning to enter the CQ WW RTTY contest as a Multi-1 station as well as the Oceania DX SSB Contest. We hope both of these entries will provide opportunities particularly for the RTTY and SSB die-hards.
We passed several major milestones in recent weeks including the completion and packing of our 40m and 30m 4-square arrays, testing and packing of the 6m EME and 20-10m arrays, initial testing of the beverage on ground receive antenna and an on air test of the 160m inverted L built on our Spiderbeam 12m fibreglass pole (which returned impressive results during the Remembrance Day contest held in VK last weekend).
This week we also completed the first set of payments for our freight shipment to Tonga. This first load consists of the majority of the antenna arrays. All up we are shipping ~250kg of equipment to establish 2x 500W HF stations, 1x 6m EME station and a 3rd 100W HF station. (We had hoped to have more power but alas after the failure of one of our multi-band amplifiers during the 6m EME trials in July we learned a few weeks ago that it wont be returning from repairs in time to make it on the expedition).
On Air Planning & Propagation Predictions
We are finalizing operating plans and studying propagation charts. More information can be found on our operating pages
Please note our operating strategy:
If we are calling for NA, EU or AS we politely request other regions stand by.
However if you are in OC, SA or AF we will accept your call at any time!
When should you look for us? The team at Voacap.com have kindly added our expedition to their Voacap DX Charts page. Just enter your grid square and scroll down to the A35JT entry. The following is a quick summary Zone by Zone of expected conditions.
A35JT Pilot Team
To assist the A35JT expedition team get quickly dialled in to what bands are open from when for Tonga, we have enlisted the help of various pilot stations around the globe. The role of the pilot stations are to gather SWL reports as to when stations in their area are hearing the DXpedition. SWL reports containing the date, time, band and mode are then compiled and forwarded to the team on the island, so they will know when they are being heard and adjust their operating schedule for various continents to target them at the right time.
NOTE: pilots do not take NIL complaints, requests for certain bands or modes (wish list), etc. These will be considered only after the expedition by our QSL manager via the OQRS Busted Call Request function.
Our pilots are:
- Chief Pilot – Bjorn ON9CFG
- North America – Steve N2AJ
- South America – Cesar PY2YP
- Oceania – Chris VK5SA
- Japan – Joe JJ3PRT
- Youth & ATNO – Jim AC9EZ
E-mail addresses for out pilots will be published shortly!
We must thank Joe JJ3PRT in particular for his help with our Japanese Web page too!
If you would like to support our expedition, please click on the donate button on our website!
Please include your callsign and indicate whether it is a general or a specific EME donation in the Paypal Note!
We must thank both our society and corporate sponsors who have helped greatly with making this expedition possible! As we are quickly learning, expeditions are expensive things to stage. Even modest ones like ours. The support of the DX associations and corporate sponsors is invaluable!
Our website also contains full details of our frequency plans.
|160m||1818kHz||1846kHz||1803kHz||1840kHz (1908kHz for JA)|
|80m (for JA)||3518kHz||3775kHz DOWN 5||3535kHz||3570kHz|
|6m EME||50185kHz JT65A|
Logs and QSL Information
We are exploring a live logging feed option as well. If we can make it work we will announce it on our website!
OQRS QSL Requests
LoTW will be uploaded once the team returns to Australia. If you wish to receive a direct paper QSL, please request these via our QSL Manager Charles using the M0OXO OQRS Service. The cost for a direct card is currently $3USD which covers printing and postage (only). You can also request cards to be delivered to you via the QSL Bureau network using the M0OXO OQRS. Bureau cards will be delivered free of charge.
Note: due to WIA (2018) Outbound member QSL policy for DXpeditions, I will reply to all received incoming bureau cards via my QSL manager.
DX Trophy Awards
If you are participating in the DX Trophy Awards you will be pleased to learn that A35JT qualifies for that award.
So with 30 days to go things are looking good!
We hope to work you all from Tonga in September!
73 from the A35JT DXpedition Team!
What can I say, it has been an eventful month! After all the preparatory work to date, we took most of the antennas bound for Tonga out to a remote location SE of Adelaide to run shake down trials. It was good that we did, for we learned a few thing that are best learned back home rather than out in the Pacific.
What worked – 6m EME!
One of the key things we wanted to do was repeat the trial of the 6m EME station with the final antenna array with it’s elevation mount on the final Spiderbeam 10m aluminium mast using the M&P Hyperflex-13 feedline we obtained from RF Solutions. This was the first time we were looking to test the entire system end to end. We achieved success 5 deg above moon rise with contact to W7JW. We also heard 2 other stations but were unable to complete with them this time.
What didnt work – 6m EME
Things were going well until about 2 hours in. Then chaos broke out when the SPE 1.5K-FA amplifier failed catastrophically. This caught us by surprise as we were only driving it to 2/3rds of its output power (running 1kW) with the PA temperature remaining under 65deg Celsius (the documentation said that the amplifier wouldn’t take steps to protect itself until it reached 75deg C). Knowing that JT65 is a demanding mode, we had actively sought to treat the amplifier with care (even ensuring that the K3S was unable to generate more than 12W input to avoid any risk of over-driving it). Unfortunately it turns out it wasn’t carefully enough, although we believed it should have raised alarms etc first.
The fallout of this has been very expensive for the team. While the suppliers have been good with regards to honoring warranty repairs, it has become clear this week that we face the very real chance of the SPE not making it back from repairs in time to be included on our customs import/export documentation. This has thrown several aspects of the operation into re-planning to see what we can do (including back up amplifier purchases).
6m EME – Back on Track
On the 6m EME side, we have already started recovering the situation. We were very lucky that an alternate 1kW solid state amplifier came onto the second hand market just after the failure. The replacement, an M2 Systems M6-1K2 amplifier (the same type Lance W7GJ uses for his expeditions), is now enroute to Australia. We will conduct a followup systems integration test at the QTH of EME operator Peter VK5PJ as soon as it arrives. This will put the 6m EME part of the project back on track. We must thank Bjorn SM7SJR for his help with the replacement amplifier and Peter VK5PJ for the power supply to run it.
What did work – HF Antennas
Also over the test weekend we erected the final configuration of the 30m and 40m 4-square arrays. 30m was the first to air and the tests showed excellent directivity and performance. Steve VK5SFA who had led the 30m 4-square array development project was very happy with the results. 40m was next.
40m was an array we were watching closely. We had prior to the test weekend seen problems with it when trying to measure it’s radiation pattern in a park in suburban Adelaide. We had been thinking, at the time, that perhaps there were interactions with the local power poles or perhaps even the 30m array, as the directivity was nothing like what was expected.
Unfortunately, once testing began, it became clear that the 40m array did have a problem that we hadn’t seen on the first test earlier in the year. Oly, VK5XDX, then started investigating, aided by the team. Once back in Adelaide, he found a broken joint hiding in one of the 1/4 wave phasing feeders that drove the array. This was causing severe pattern distortion. Oly also made some changes to the ground radial design too. These two issues combined were responsible for severely degrading the 40m performance.
To prove it once and for all, Oly then set the array up again (a time consuming task when undertaken solo), this time on a farm north of Adelaide. Grant then went out to help test it with Oly the following weekend. The results were excellent, and we were met with fantastic reports. Front to back ratios in excess of 20dB (in fact we estimate closer to 25-26dB) were observed and excellent reports were received with stations both in Europe as well as domestically. The 40m 4-square project was finally finished ready for packing.
Progress in other areas
We also did some more testing on the 80/160m antenna at the farmstead and debugged a few more issues. That antenna will receive it’s final shake down testing during the Remembrance Day contest to be held on the weekend of August 16-17th but is now looking very promising. We also hope to test the beverage antenna for the first time during that contest.
Progress has also been made both on the tune and test weekend and over the following weeks, with most of the PC network and Logging / digital modes software integration completed. We are also considering what the 3rd back up transceiver will be and are in fact preparing to potentially have up to 3 stations on air at times (although it should be noted at least one will only be 100W at the time). All up our preparations are on track. For such a small team this has been a huge amount of work, but the testing and construction work we feel will be invaluable in bringing Tonga to the world in September.
HF Challenges still to be faced
Unfortunately we have one remaining challenge to overcome. The loss of the SPE amplifier is a serious blow and our resources wont stretch to any further amplifier purchases at this late stage. We are still following up on sources of a 2nd amplifier for HF as we have reservations that the SPE will not return home before we leave. If these alternate plans come to fruition, we will hopefully be back to our original planned strength before long. We will let you know more as things unfold.
While we have had our setbacks in July, the team is still in great spirits and is keen to get everything out to Tonga and get started. We are now under 60 days to go before we leave Australia and are looking forward to bringing you the best signals we can from the Kingdom of Tonga in only 2 months time! If you would like to support our efforts, donations are most welcome. See our donations pages for details.