A paper, prepared for the upcoming IARU Region 1 conference, raised another alarm bell for me. Although up till now, no wind farms are near my QTH, but from the IARU paper, it can be learned that wind farms cause interference at distances up to several kilometres! Here is the report:Radiated RF emissions from wind… Continue reading »
A few days ago I worked PJ7/W9DR for a new entity on 6 metres. In the past, the entity was deleted because of the change in governmental structure. The contact with PJ7/W9DR was greatly appreciated! Looking W9DR up on QRZ.com led me to a nice video of his water cooled 6 metres amplifier, that runs… Continue reading »
The FCC recently issued an order where AFX inc. will have to pay a $ 90,000 civil penalty for marketing non compliant equipment that caused interference. The company marketed LED lighting devices without prior authorisation. This is the FCC Order. It is about time, Europe adopted the same policy. The industry will think before marketing… Continue reading »
After putting up the 5+5 element YU7EF 6/4 metre dual band antenna, I was curious how the new antenna performs. Although I realise that a real measurement requires quite a bit of effort, a simple comparison between the new antenna and an antenna with a more or less known performance at least gives a clue… Continue reading »
Recently, I received a note that Chines radio modems are used for telemetry. The note states that these transceivers are operating on our 2 metre band between 144 and 146 MHz. More details are expected. Along with the note, a link was sent with a URL to a Chinese company, selling these transceivers. They operate… Continue reading »
These days, we often hear the abbreviation IoT, which refers to the Internet of Things. For me, the abbreviation triggered the term “Interference of Things”. We live in an age of ever growing numbers of electronic devices, that all have one thing in common: they need power and thus can be the source of unwanted… Continue reading »
Last week, I put up a dual band antenna for 6 and 4 metres. It was difficult to decide what to build. Last year, I had separate antennas for both bands. Dual band antennas are attractive, because of lesser wind load and also because it leaves some room for other antennas. Another aspect was that… Continue reading »
A short while ago, I had problems with my antenna system on 20 metres. It took a while to trace the cause. In 2015, I “restarted” amateur radio and put up a dipole for 60 metres. After a while, I decided to consider options to become QRV on other bands as well. I tried a… Continue reading »
In February 2107, a lecture (Dutch language) was given by PA2S. Op this page, the presentation can be found, along with links to resources.
Currently, I am working on a paper regarding propagation on 60 metres. Transmissions with JT mode were used to collect spots and create datasets. A valuable datasource is wsprnet.org, to which WSPR spots are uploaded and fed to a database. The data can be downloaded. In order to support the study, I developed a WSPR… Continue reading »