Topics and links of the broadcast 27-08-2023 11:00 am (CEST)

From the RSGB news (by PC5D)

The RSGB holds its annual convention on October 13-15. The AMSAT Colloquium is one of the parts during the event. The program of the RSGB includes a fine lineup of expert speakers and amateur radio topics. You'll hear behind-the-scenes stories about the Rockall DXpedition 2023 and the Bouvet 3Y0J DXpedition; Cathy Clarke, G1GQJ talks about the history of RAYNET and its importance in the modern world; and there are presentations on aircraft scatter, PCB construction plus working FM satellites on a low budget. After the news that it United Kingdom will host the World Radiosport Team Championship in 2026, you will hear from participants and referees who
participated in the 2022 championship and you will gain insight into the preparations for the 2026 event. For the first time, the convention also have a clear focus on expanding the scope of hobby and practical activities since the RSGB possibilities offers for individuals and clubs to 'get started' and inspired to try new things in their local area. These are just some of the many highlights and the RSGB will provide all the details publish in the October RadCom and on the website.

IARU Region 1 will hold its next General Conference from 1 to 4 November 2023 in Zlatibor, Serbia. A large number of papers and proposals are now available online. Topics include: general reports; organizational and budget proposals; the new HF band plan; VHF, UHF and SHF changes; and highlighting WRC-23, which follows shortly afterwards. Other themes are: strategic projects and progress, adaptation to digital technologies, competitions, EMC and other spectrum matters.

The RSGB welcomes comments in preparation for the conferences. For however, it is also an opportunity for amateurs outside the UK to get acquainted take the latest international developments that will soon be discussed. You will find a link to the consultation via

Radio propagation (by PC5D)

Propagation news is curated by Tom PC5D. In the composition he makes other use of the information relevant to the Netherlands from the weekly Propagation News of the British radio amateur association RSGB, dxinfocentre , , Make More Miles on VHF and Propagation news is also part of the radio news of the South Limburg Sunday morning round. The audio recording of this round is back listened on

The last week of August has arrived and the daylight period is now rapidly getting shorter. It is also the beginning of the time when the chemical composition of the ionosphere changes to more monatomic molecules, which are known to ionize more easily. On HF, the effects of the approaching autumn were already noticeable. Despite the low solar activity increased MUF, the bands around 24 MHz and above were temporarily open. 21MHz was open all day and at night the MUF moved around 15 MHz. Many a DXer had this with tension awaited. Another plus is that the size and number of coronal holes on the sun is strong decreased. Earth's magnetic field remained largely calm throughout the week as a result.

Listeners on the lower HF bands were only affected by the summer thunderstorms above Europe. After about a dozen M-flare free days, there was a pretty weak one early Friday morning M-class solar flare. Solar wind speeds are currently increasing slightly, it interplanetary magnetic field (IMF) mostly weak.

The media also paid attention to a scientific publication last week in the journal Science. This was discovered through measurements from the Solar orbiter that orbits the sun small jets or jet streams escape from the sun. Those would be the long-sought source of the solar wind, the charged particles that cause the aurora on earth. The telescope is largely built in Belgium and is managed by the Royal Observatory from Belgium. The broadcaster VRT pays attention to this on one of its web pages.

For the next few days we can expect propagation conditions to be good to stay. The solar flux index is currently around 140 and could be done by next Friday increase to 165. The Kp index will go from 2 to just above 3 and that will be it Earth's magnetic field remains calm until active. The maximum usable frequency will therefore vary between 14 MHz at night to 24 MHz during the day. So we can expect DX again at 21 MHz and usually shortly after sunrise until shortly before midnight. Gaps above 24 MHz will become more common and take longer.


The wind is still from the southwest corner, but the pattern with high and low pressure areas ensures that this does not produce any significant tropo. It stays wait and see how the weather will develop during the week.
The showers in the coming days do offer opportunities for rain scatter.

We are approaching the end of the traditional Sporadic-E season. One more in each month prevent opening, but activity is much lower after the first week of September. We still get the occasional flurry of activity for multi-hop trails at 10m to the Far East and the States. In the coming week there are 2 more small meteor showers that will contribute above random meteors for scatter connections.

For Aurora, the Kp index is still too low for the time being. Note that the fall and spring months are typically a preferred time for auroras. This Saturday, the declination of the moon is minimal so that the moon does not rise above 10 degrees height comes. It will be positive again next Friday. Because the perigee of the Moon is on Wednesday, path losses are low. 144MHz sky clutter is high this weekend, but falling to low levels next Friday.