Project Horus High altitude balloon project


The WIA Annual General Meeting Voice Repeater Flight This Sunday

Several months ago, the Project Horus group was invited to participate in the Wireless Institute of Australia's Annual General Meeting and Technical Symposium presentations, being held in Mildura, Victoria over the weekend of Friday May 25th to Sunday May 27th. The group happily accepted, and is now in the final stages of preparation for what will be a very busy weekend for us.

Firstly, the Project Horus group will be giving a technical presentation on Saturday afternoon as part of the AGM technical sessions. During our 40 minute presentation we will be giving an introduction to the project and highlighting some of the amateur radio aspects of the project's operations. You can find out more about the Technical Symposium and other AGM activities on the WIA's website:

The main event for us, however, begins on Sunday with the launch campaign planned from Mildura.

Flight #1 - HORUS 26 - Amateur Radio Repeater - Sunday May 27th

The first balloon that will be launched at the convention is going to carry aloft the flying cross-band FM voice repeater. This repeater will be accessible at apogee from nearly 2,000,000 sq km of SE Australia and is expected to cover Sydney, Melbourne, Canberra and Adelaide simultaneously.

Expected radio footprint at apogee.

Horus 26 should lift off at approximately 8am AEST Sunday May 27th. (2200 UTC May 26th).

The window for contacts covering that footprint will only be ~30-60 minutes at apogee which should be reached at approximately the 90-120 minute mark in the flight. In all, 2,000,000 sqkm of SE Australia will be able to see the balloon repeater as the footprint will extend to approximately a 1600km diameter.

The FM cross band voice repeater frequencies on the balloon for this flight are:

  • 438.900 MHz Uplink with 123Hz CTCSS (FM)
  • 147.500 MHz Downlink (FM)
PLEASE REMEMBER TO TURN ON YOUR CTCSS tone - otherwise you will only cause interference to others accessing the system.

Net control will be a joint effort between our usual net controller in Adelaide (VK5GH) and a local net control operator based out of Mildura (to cover the flight until it can be heard in Adelaide).В Contacts will be logged and QSL cards will be provided for all contacts via the HORUS balloon repeater.

Horus 26 Telemetry Sources

In addition to the voice repeater, amateurs will be able to follow the flight via the APRS network on 145.175MHz. VK5ARG-11 will be beaconing the balloons position throughout the flight via a “WIDE2-1” beacon path. This will enable it to be picked up by iGATE systems across SE Australia and then be relayed to the Internet. Amateurs will be able to watch the balloons progress via popular APRS sites such as

To provide the ground crews with some systems redundancy, the standard RTTY 300 baud telemetry payload will also be flying. This beacon can be received and decoded with the DL-FLDIGI software. You can find out more about how to decode this beacon here:

This 300baud RTTY telemetry beacon will fly on 434.075MHz ± 5kHz USB (the beacon drifts as the payload gets cold – it can reach below -50dec C during the flight in the payloads). This flight will identify on the air as HORUS.

The project group is very keen for amateurs within the footprint to also attempt to receive this beacon, as the data collected is (when you enable the Internet option in the software) also uploaded to the website. There it is aggregated and used to help predict the landing zone of the balloon during flight. As such, it is a valuable resource for the chase teams, and is a great way for the amateur radio community to get involved in the engineering side of the flight.

Flight #2 – HORUS 27 – Imaging Payload

The Project Horus group has carried a number of imaging payloads aloft over its more than 2 year history. We have had one of these payloads waiting for the right weather conditions for some time now. The legendary sunny weather of Mildura and reduced risks of landing in the ocean has given the team the inspiration to attempt to fly this imaging payload as well this weekend. As a result, Horus 27 is also planned to fly THIS SUNDAY.

Horus 27 will also carry an APRS and RTTY telemetry system.

APRS will operate as VK5ARG-12 on 145.175MHz operating in the same way as VK5ARG-11.

The 300 Baud RTTY will operate on 434.650 MHz ± 5kHz USB. HORUS 27’s RTTY telemetry will identify as DARKSIDE to separate the telemetry streams when they are uploaded to .

The Horus 27 flight is currently planned to lift off at ~0900Hrs Sunday 27th May (2300 UTC May 26th).

Amateurs are invited to also track HORUS 27 and provide their received telemetry feed via the Internet to the SpaceNear website. The project team would really appreciate seeing telemetry from both balloons (which will both be in the air simultaneously) being captured by amateurs from around SE Australia as it all helps capture as much data as possible about the progress of the flight.

For confirmation of launch of each balloon, the team will post announcements to the VKLOGGER DX Cluster as well as progress updates via Twitter (look for hash tag #projecthorus).

We look forward to seeing amateurs from across the region get involved in tracking and communicating via this unique experimental system!

Best Regards,
The Project Horus Balloon Team

Filed under: Launch Leave a comment
Comments (4) Trackbacks (2)
  1. Great work guys, enjoyed listening to the chase. Thanks for all your efforts in coming to Mildura for the WIA AGM and showing us another aspect of this great hobby. You guys rock!

  2. Our pleasure Peter! We had a ball (albeit an exhausting one).

  3. As the civil unrest waned, people gradually filed back into their own homes
    and communities. Some health benefits that you can get by
    using this device are preventing illness, obesity, reducing tension and enhancing the
    immune system. Many additional features
    and accessories can be purchased at a later date and fused with your current
    setup to accommodate a growing child and family.

  4. I rented funny movies and read a lot of historical romantic dramas.
    This article will discuss the two types of whole body vibration machines.
    What we are actually doing is projecting anger from our own energy
    source onto Karen reinforcing her emotional state.

Leave a comment