Author Archives: VK5QI

VI25AREG Picnic, ARDF & WWFF Activation Lunch!

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As part of the VI25AREG celebrations, AREG will be holding a picnic lunch at the Para-Wirra Conservation Park, starting around 12PM on Sunday the 30th of July. We’ve booked the ‘Bush Oval’ site, which can be found at this Google maps link. We’re planning on running a BBQ for lunch, and there’s even some talk of 25th anniversary cake!

We’re planning on activating the conservation park (VKFF-1739) on a few HF bands with some members portable HF setups – if you have a portable setup you want to try out, bring it along, there’s plenty of space.

There will also be a short Amateur Radio Direction Finding (ARDF) course setup around the area, with plenty of spare receiving equipment available for anyone that wants to have a go.

Please note that Para Wirra Conservation Park does have a vehicle entry fee, which can be paid online here.

Hope to see you there!

73 Mark VK5QI

Next Fox Hunt – Friday 14th July

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AREGs next car-based fox hunt will be held this coming Friday the 14th of July, starting from the car park of the North Adelaide Aquatic Centre Carpark at 6:30 PM. We’ll have three foxes deployed around the Adelaide area, on both the 2m and 70cm bands, so come along and have a go!

The frequencies will be:

  • 145.300 MHz (1W transmit power)
  • 144.390 MHz (100mW transmit power)
  • 439.400 MHz (50mW transmit power)

As usual, liaison will be on the VK5RSB Summertown 70cm repeater which operates on 439.900 (-5MHz) 91.5 CTCSS. Please come up on the repeater so we know how you are faring throughout the evening!

The event is open to anyone with radio direction finding equipment and will span most of the Adelaide metropolitan area. We would love to see you there!

73

Mark VK5QI

VI25AREG – AREG’s 25th Anniversary! Come find us on HF, VHF/UHF, DSTAR, DMR, Satellites, and more!

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The 27th of July is the Amateur Radio Experimenters Group’s 25th Anniversary!  As a celebration of this event, we will be activating the VI25AREG special-event callsign between the 1st of July and the 31st of August. The aim is to have the call active on as many bands and modes as possible, reflecting the huge diversity of interests of AREG’s members across the whole spectrum of amateur radio activities.

Special Event QSO Award

AREG has always sought to promote experimentation in amateur radio as a pathway to learning. To celebrate this, we are offering  a special award available for any station who contacts VI25AREG using a minimum of three different transmission modes. The aim being to encourage people to experiment with different modes. You will find the call in use in some unlikely places as a result, including PSK, Olivia, FreeDV, DMR, FUSION, FM, AM, HF, VHF, UHF and more. Work us on three modes and you will qualify for our award!

 

 

To apply for the certificate, just send an email to vi25areg (at) areg.org.au with your ADIF log extract showing the three qualifying QSOs. If your QSOs are found in our log, you should receive your digital certificate within a few days!

Special Event QSL Card

Click to request QSL Card

A special 4 sided QSL card is being designed by the members of AREG for this event. The card design will be completed by August 31st (aligned with the close of the celebrations). Requests for a copy of the card can be submitted via our QSL Manager, Charles M0OXO. You can also see whether you are in the log via Clublog!

Clublog Log Access

 

On Air Celebrations: Where to find VI25AREG

 

Look out for VI25AREG on the following bands and modes over the next few weeks, and check back on our website often for specific activity announcements!

  • HF – Regular activations on many HF bands, check dxheat.com/dxc/ and ClubLog to see where VI25AREG was last heard! The following specific activations are planned:
    • VI25AREG Picnic at Para-Wirra Conservation Park, starting ~12PM on Sunday the 30th of July.
  • 6M – VI25AREG is planned to be used on 6M at the following times:
    • As part of the weekly 6m FM net, on the VK5RSB 6m repeater, Tuesdays and Thursdays at 11AM ACST.
    • Sunday mornings, 10:30 AM ACST on 53.100 AM, and 10:45 on 52.100 SSB.
  • Repeaters – We plan to run a net on the Central VK5 Linked Repeater Network at 10AM ACST on the following dates:
    • 8th July
    • 22nd July
    • 5th August
    • 19th August
  • Satellites – the following satellites passes are planned to have VI25AREG activations:
    • TBD!
  • Digital Voice Modes – activity is planned on each of the following networks
    • DMR: Tuesday 25th July, 0900Z, on VKDMR Talk-Group 505.
    • DSTAR:
    • FUSION:
  • High-Altitude Balloon Launch
    • We are planning a High-Altitude Balloon launch making use of the VI25AREG callsign in mid-to-late August. Tentative launch dates are either the 13th of 20th of August.

We are hoping to get many of our members on air operating the callsign.

AREG History

Formed back in July 1998, AREG started out with 7 members focused on amateur radio and electronics experimentation. There were early projects driven by interests in high altitude balloons and repeaters and the group started some early fund raising efforts to support these.

Over time the group continued to slowly grow through until ~2010 when larger activities were attempted, including efforts in various contests and operating on air using special event call VI5MCP (100th anniversary of Morialta Conservation Park). Around this time, the group moved from meeting at members homes to the Reedbeds Community Centre in Fulham too, and the groups focus began to broaden and look to engage more actively with the wider amateur radio community. In the last ~15 years, the group has gone from strength to strength, partnering with the Project Horus high altitude balloon team, being very active in radio contesting, began providing community service communications for the River Paddling Marathon in the Riverland and establishing many new services for members, growing the club’s reach through its internet presence in the process.

VK5CLD’s portable setup
A typical HF spectrograph from May 5th 2023
The happy hunters

From our original 7 members, the group has now grown in size to well over 100 people located across 6 states. With that base, AREG continues to seek opportunities to make a positive contribution to the amateur service in Australia. We therefore are now celebrating the past 25 years and are looking forward to the next 25!

We look forward to working you from VI25AREG!

Next AREG Meeting: July AGM & Paul VK5PAS – Portable Operations on Troubridge Island

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The next AREG meeting will be held on Friday the 21st of July at the Fulham Community Centre – Phelps Court, Fulham. This will be the AREG’s Annual General Meeting, which will include the election of the 2023-2024 committee.

This months presentation will be from Paul Simmonds VK5PAS, on the recent Troubridge Island DXpedition. Paul was unable to present at the May meeting, and has offered to present at our July AGM instead! Paul will talk about how the expedition was planned, what antennas and equipment they used on the island, and discuss the results of the expedition and lessons learned.

Doors open at 7.15pm and the presentation kicks off at 7.45. Everyone is welcome to attend. If you’ve never come along to one of our meetings, we’d love to see you there, all guests are welcome. For our remote members, the meeting will be broadcast via Zoom, and will also be live-streamed on the HamRadioDX Youtube channel!

After the talks we’ll all be given an opportunity to have an eyeball QSO among ourselves whilst enjoying a tea or coffee and a biscuit.

73, Mark VK5QI

Next AREG Meeting: Stuart VK5STU – “An Overview of SAGRN Services, Technology and Operations”

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The next AREG meeting will be held on Friday the 16th of June at the Fulham Community Centre – Phelps Court, Fulham.

A helicopter assisting with installation of antennas on a SAGRN tower.

This months presentation will be from Stuart VK5STU, talking about the SA Government Radio Network (SAGRN). Stuart will be covering the 5 services within the SAGRN and go through the technology employed across these services as well as coverage design and engineering considerations. He will also talk about how the network is operated and managed, and the challenges faced during major incidents.

Doors open at 7.15pm and the presentation kicks off at 7.45. Everyone is welcome to attend. If you’ve never come along to one of our meetings, we’d love to see you there, all guests are welcome. For our remote members, the meeting will be broadcast via Zoom.

After the talks we’ll all be given an opportunity to have an eyeball QSO among ourselves whilst enjoying a tea or coffee and a biscuit.

73, Mark VK5QI

No June Fox-Hunt

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AREG regrets to advise that due to the proximity of the usual monthly fox hunt date to the Riverland Paddling Marathon (where many AREG members will be heading to), the June fox hunt will not be going ahead.

Stay tuned for details regarding our July hunt, to be posted here closer to the date.

73 from AREG!

AREG’s HF Spectrograph shows the effects of Solar Flares

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An X-class Solar Flare imaged by the Solar Dynamics Observatory in 2012.

An X-class Solar Flare imaged by the Solar Dynamics Observatory in 2012.

Solar flares from the sun can result in many different effects on High Frequency (HF) propagation. The most immediate and noticeable is when the increased solar X-Ray flux resulting from a flare interacts with the ionosphere. These X-Rays charge the ionosphere’s D-layer (responsible of the absorption of the lower HF band during the daytime), and results in higher levels of absorption extending right up to the top of the band. This has the effect of reducing signal strengths right across the band, resulting in what is known as a ‘HF fadeout’.

X-Ray Flux data from the GOES satellites, provided by NOAA

Solar flares are categorised based on the peak X-ray flux they emit, with the different levels given letters A, B and C for relatively weak flares, and M and X for stronger flares, with X-class flares being the strongest. HF fadeouts are generally caused by M and X-class flares. A live plot of X-Ray flux data as observed by the Geostationary Operational Environment Satellites (GOES) is available here: https://www.swpc.noaa.gov/products/goes-x-ray-flux

Short Wave Frequency Coverage Prediction

HF Fadeout Coverage area for a M1.2 class flare, from the Space Weather Service website.

The Australian Space Weather Service provides a HF fadeout warning service via email, and you can also see reports of the most recent HF fadeout on their website.

AREG’s HF Spectrograph Service

AREG hosts many services at its remote HF receive site located near Tarlee, including multiple KiwiSDRs, skimmers for WSPR, FT8 and SSTV, and other higher performing receivers reserved for club members. We thank Swoop Internet for providing us with the internet service at this site, for free!

The HF receiver antenna (a broadband monopole) at AREG’s remote HF receive site.

Using software written by Mark VK5QI, AREG also generates a Spectrograph showing the state of the HF band over the last 3 days. A spectrograph is similar to the waterfall display you might have seen on other SDR receiver software, though in this case covering the entire HF band (0 – 30 MHz), and looking over a much longer timescale. Warmer colours (reds and yellows) represent stronger signals, and cooler colours (blues and greens) represent weaker ones. The spectrograph updates approximately every 30 minutes, and is available at the bottom of the Remote HF Receiver site page, or directly here.

A typical HF Spectrograph, with some features annotated.

The spectrograph gives us a ‘quick look’ at the state of the HF band. The strongest signals (red) are the bands of shortwave stations around 6, 7, 9 and 11 MHz, mostly propagating in from south-east Asia. The most obvious time-varying effect is the change in propagation conditions from day (propagation mainly at the higher end of the band), to night (propagation mainly at the lower end of the band), but we can also see other effects such as solar radio bursts, local noise issues, and of course HF fadeouts.

In the above figure, a number of HF fadeout events over the 18th through 20th May 2023 period have been marked, showing the X-Ray flux event they correspond to. The HF fadeouts can be seen as a sudden reduction in signal strength right across the HF band, followed by a slow return to normal. Note that we don’t see the effects of X-ray flux events occurring during our local night, due to the Earth sheltering us from those X-rays.

So, next time you think the HF band seems a bit dead, maybe go take a look at the AREG HF Spectrograph to see if there’s a HF fadeout in progress!

73 Mark VK5QI

Next AREG Meeting: Paul VK5PAS – Portable Operations on Troubridge Island

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The next AREG meeting will be held on Friday the 19th of May at the Fulham Community Centre – Phelps Court, Fulham.

Unfortunately Paul is unavailable to give the talk at this meeting. Instead Grant VK5GR will be presenting on RTTY contesting. Thanks to Grant for agreeing to present on such short notice!

This months presentation will be from Paul Simmonds VK5PAS, on the recent Troubridge Island DXpedition. Paul will talk about how the expedition was planned, what antennas and equipment they used on the island, and discuss the results of the expedition and lessons learned.

Doors open at 7.15pm and the presentation kicks off at 7.45. Everyone is welcome to attend. If you’ve never come along to one of our meetings, we’d love to see you there, all guests are welcome. For our remote members, the meeting will be broadcast via Zoom, and we’ll try and get a recording of the talk for later upload to Youtube.

After the talks we’ll all be given an opportunity to have an eyeball QSO among ourselves whilst enjoying a tea or coffee and a biscuit.

73, Mark VK5QI