AREG’s New 160m/80m Contesting Portable Antenna – Progress

Update – July 12th: Mounting of the tuning capacitor and motor drive is complete. Just a few more things and we will be ready for final assembly and tune up!

A group of members inside AREG, inspired by Steve VK5SFA’s success with his transmitting magnetic loop antennas have banded together to construct for the club it’s own 160/80m TMLA, specifically designed to be portable. It is able to be knocked down into components that can be packed into the back of a station wagon.

Significant progress was made today in assembling the antenna as we had hoped to have it ready to try at the IARU HF contest next weekend. We didn’t quite make it unfortunately, running out of daylight before we completed construction. However, we are now planning another session next weekend with the goal being to have the antenna finished and ready to run for the Trans Tasman Low Band Challenge contest the following weekend.

The club’s version of Steve’s antenna is using LCF78 coax instead of the wave-guide, with the vacuum capacitor mounted inside a water proof ex-camera case (great for transport and moisture proofing). The frame is made out of laminated bamboo broomsticks and a timber hub arrangement with the frame held together through compression provided by 8 ratchet straps. The aim is for the antenna to be suspended from a tree (or trees) at least 1 loop diameter above the ground (to increase it’s efficiency). It has been designed to accept 400W input power as well to overcome the efficiency issues these antennas can have.

Today’s construction efforts were led by Steve VK5SFA, Grant VK5GR and Scott VK5TST. The project wouldnt have been possible without generous donations from Steve VK5SFA, Peter VK5KX and Trevor VK5YFR.

The next steps are to complete mounting the motor tuning drive, do some structural adjustments to the frame, assemble the coupling loop and then test the antenna. This work will be completed next weekend, so keep an ear out for us during the TTLBC Contest on July 15th on 160 and 80m using our Transmitting Magnetic Loop Antennas!

AREG Develops new DX Pileup Defeating Technology

Introducing the DX Buster(tm)!

SORRY! ALL SOLD OUT on APRIL 1st 2017 – Stay tuned next year for more Amateur Radio products from the mad scientists division of the Amateur Radio Experimenters Group!

After months of rigorous testing, the Amateur Radio Experimenters Group Inc is pleased to announce the beta version of our new DX Buster(tm)! is nearly ready for initial release. What is it you might ask? Well, it is designed to help you to break through pile ups during DX Contests and DXPeditions, ensuring your signal is the one heard clear and true, first time, every-time!

There will be no more disappointment that the DX got away when you are using a DXBuster!(tm), even if you are only a small 100W pistol or 400W VK “high power” station located more than double the distance from that rare DX station compared to the majority (as is often the case when comparing VK to Europe, North America and Japan where they run 1kW or more). Now, with DX Buster!(tm) on your team, you can rest assured your signal will always be clearly heard among the pileups at the DX stations end, guaranteeing you will get that rare one in your log, even with modest power.

How does it work?

DX Buster!(tm) is a DSP device you insert into your microphone audio stream, and then also connect to the Internet. It works by mixing your transmitted audio with an anti-phase, time correlated / corrected version of the signals that the DX station is listening to, based on what is being received via any WebSDR located close to the major source of the DX calling pile-up stations.

Using patented Flux capacitor technology, and augmented by feeds from the Reverse Beacon and PSK Reporter systems tuned to the WSJT JT65 networks as well as space weather predictions from the NOAA and Australian Bureau of Meteorology, the propagation channel between your station and the rare DX is computed. Then, the anti-phase signals matching the majority of the pile up stations within 4kHz of your signal are delay matched to your station and then injected into your audio. The rest follows the laws of physics! When the out of phase signals are combined at the DX stations receiver with the other pile up traffic, that traffic is attenuated, while your own audio laid over the top passes through unaffected. The end result is a minimum 10-30dB improvement in your apparent signal to noise ratio as measured at the DX station.

Don’t quite believe it? Take a look at the following waterfall charts and sample audio streams to be convinced!

How can I get one?

Currently only a prototype of the unit is available, as a number of technical details are still being refined to make it adaptable to as many transceivers as possible. As soon as these are resolved, we will open our books for orders!

Keep watching the AREG website for further details!



VK5RWN Wireless Link

On October 18th the AREG installed a new 5.8GHz wireless link into the VK5RWN repeater system.

The system is on test for the next couple of weeks, the results have been very promising with the link providing in excess of 30Mbit throughput (full duplex).  Certainly many times faster than the current 512kbit symmetrical ADSL connection.


Once the wireless link has been finally commissioned and cut over the AREG will be able to close the current ADSL and Telephone internet connection which will significantly reduce the on-going running costs of this site.

I’d like to thank Bob VK5FO, Ray VK5RR, Andy VK5AKH and Mark VK5QI for assisting me with the installation and setup of both ends of the link.

73 Matt, VK5ZM

IRLP Updates

Thanks to the hard work of Ben, VK5BB, our IRLP node is back up and running on VK5RSB 70cm. The usual access conventions apply, and currently no access code is required (though this will change shortly).

To accommodate the (often quite busy!) drive-time nets, the IRLP node is automatically disabled between 7AM to 9AM, and 4PM to 6PM. Enjoy the node, and please make sure you identify before using it, even if just checking the node status!

73s, Mark VK5QI
AREG Secretary

VK5RWN Port C (2 metres) frequency changes

Hi all D-STAR Users,

Just to advise, VK5RWN Port C (2 metres) has had its frequencies changed as of Monday 23 September 2013.

The new Repeater frequencies are,

Repeater Tx 147.0375 MHz
Repeater Rx 147.6375 MHz, (+ 600kHz shift)

therefore you need to change your portable and mobiles to reflect,

Mbl/Port Tx 147.6375 MHz
Mbl/Port Rx 147.0375 MHz
Set Rptr1 VK5RWN C
Set Rptr2 VK5RWN G

The frequency change has been brought about due to adjacent channel interference from the VK5RLH 2m repeater at Lochiel causing problems for some users mobiles and portables. These frequency changes are temporary whilst we evaluate the impact of the changes. If it works out OK, then AREG will apply for permanent changes and fix the frequencies.

Please let any other users know of the changes.

Advice will be promulgated via the National and Local Broadcast News and Notes, the AREG Web pages,, the D-STAR VK5 web pages.

Feedback will be appreciated.

73, Ben VK5BB
VK5RWN D-STAR Administrator

IRLP Node 6214 is off air.

The AREG sponsored IRLP node 6214 here in Adelaide, VK5, has been taken off air pending service to the VK5RAD 70cm repeater and an upgrade to the IRLP node equipment.

The node is expected to be off air for a number of weeks, possibly through to August. Work on both systems is very dependent on the availability of the few volunteers and access to the site.

AREG apologises for any inconvenience to the amateur radio community.

73, Ben VK5BB, node 6214 Administrator

23 cm analogue FM voice repeater

Saturday 2nd of March, a group of AREG members installed the 23 cm analogue FM voice repeater at the VK5RSB site, Summertown.

The repeater transmit frequency is 1273.500 MHz with a positive 20 MHz shift for receive. Transmit power into the the coax to the collinear antenna is 10 watts carrier. The repeater should provide good coverage across the major areas of the Adelaide plains.

You need to program your radio for 1273.500 MHz receive with a positive 20 MHz offset, giving your transmit at 1293.500 MHz. No CTCSS is required.

The repeater is fully operational, so check it out.

Thanks go all those who helped with the installation, Colin VK5ACE, who built the repeater, Ben VK5BB and Paul VK5BX, who did the rigging, Mark VK5QI and Andy VK5AKH, ground crew.

Website Updates

Some may have noticed that the AREG website is slowly being updated and changed as time permits.

Of note is the Upcoming Events page now works properly and all General Meetings have been added for the next 12 months.  These dates are tentative and may change as we get closer to the date, so members should watch the website for final details.  However it is nice to be able to fill in our diaries this early in the year.

In time much of the previous content will be added back to the website as we all learn what we can do with this WordPress site.

73’s Matthew, VK5ZM