WRC23 – agenda item 9.1b

The IARU maintains the view that the likelihood of widespread and persistent interference from amateur radio activities to RNSS (e.g. Galileo) receivers in the 23cm band is minimal. The WRC-23 preparatory studies carried out in the ITU‑R study groups have only considered static one-to-one estimations using a minimum coupling loss approach. These studies do not consider the effect of an amateur transmitter on a population of RNSS receivers deployed around an amateur transmitting station.

Therefore IARU volunteers have carried out a “Monte Carlo” style study simulating scenarios assuming a fixed and mobile population of RNSS receivers deployed around an amateur station. A 100W amateur ‘home station’ and a 25W eirp ‘repeater station’ have been assumed.

The simulation results suggest that at most only around 1% of a population of fixed and mobile RNSS receivers randomly situated around a transmitting amateur station location would have a small chance of receiving a signal level above the RNSS protection threshold identified in the relevant ITU‑R Recommendations. In most scenarios, the percentage of RNSS receivers impacted by interference above the threshold within the “simulation area” is far less than 1%. Even in the densest areas of amateur station activity and with the lowest clutter model the percentages remain less than 5%.

See video representations of the simulation scenario here.

The study assumed that an amateur station is transmitting throughout the whole “Monte Carlo” trial period. However event data collected by the IARU shows that even in the busiest amateur communities the amount of time during which these sporadic transmissions are most likely to occur amounts to less than 2% of time over a one year period.

Therefore the IARU maintains its position that the potential for widespread and persistent interference between amateur radio transmissions and RNSS receivers is minimal.

The IARU paper is available for sharing and can be found here.

All the background information including links to the latest developments within the international regulatory committees can be found here.

We are looking for your ideas! We are inviting you to take part in one of the HAMChallenges:

Amateur Radio is about fun, radio communications, technology, experimentation, self-training, and friendship.

Do you have a mind-blowing idea you would like to share with the community?

The International Amateur Radio Union Region 1 is inviting you to come with a game-changing idea, which increases awareness of amateur radio. We are looking for your cool idea or project which you think is part of the future of amateur radio.

Make a team, share your idea, present your proposal, and bring this to reality. This is the time present the amateur radio with a different perspective, and we are looking for you!

The best proposals will be rewarded, don’t miss this opportunity!

The challenges

Challenge #1
Oriented to young persons and/or participants without amateur radio license
What is amateur radio? Many people haven’t even heard about it. This should change! Amateur radio is about radio communications, technology and experimentation, but also about friendship, self-training and fun.
Be creative, why would like to learn more about HAM radio? What makes you curious?
Share and explain amateur radio in a fun way, in which you believe it will be attracted and known by more people.
Hint: ideas to share on social media and reaching a huge audience. Make use of reels, pictures, etc.. No limits on creativity!

Challenge #2
Oriented to licensed amateur radio operators
Use your imagination, what will amateur radio look like in 10 years? Yes, we are talking about the future. Amateur radio is changing, in the past we never heard about satellites, digimodes or SDR: And these are just a few examples. We ask you to share a cool idea or project which you believe will be changing amateur radio but is also fun to share. This could be in the direction of a technology project, experimentation or digital development.

Don’t be limited ! We ask you to share your ideas which are contributing to the amateur radio community.

HAMChallenge 2023 Rules – deadline to submit your ideas is 1^st of July 2023