Submission to CISPR on impact of emissions from multiple devices
Read here the paper which IARU has submitted to CISPR on the need to take account of the proliferation of digital devices when calculating emission limits in standards (Link to follow)
Paper on multiple sources (HB9AZO)
Heinrich Häberlin HB9AZO, of the IARU Regioin 1 EMC Committee, has looked into the theory which is behind the accumulation of noise. This is something most radio amateurs have experienced. In this article Henry enlightens us on the theory, with some examples of the impact in two different scenarios — a 2‑and 3‑dimentional model. His simulations are implemented in Excel. The paper has been one of several sent to CISPR on accumulation of noise. His paper is found here
Wireless Power Transmission
Read some of the studies IARU has submitted to regulatory forums for WPT for electric vehicles and for low power generic WPT(pdf downloads). The report of tests on low power generic WPT devices can be downloaded here (pdf)
Solar PV Optimisers
HB9AZO’s report of investigating interference from a solar PV system can be found here
There are also otehr reports (in German) about EMC disturbances from PV optimisers:
https://www.uska.ch/wp-content/uploads/2020/06/HBradio‑3 – 2020_HB9AZO‑S.-48 – 50.cor_.pdf
LED lighting
More and more LED lights are entering the market and are being used by radio amateur and their neighbours. There is a limit to maximum disturbance voltage on the mains port defined in EN55032, this gives a better protection than the previous recommendation. This has improved the situation with regards to EMC for equipment put on the marked today.
As consequence, we can observe newer LED lights causing only little trouble, others however cause a great amount of harmful interference due to mains line radiation. As worst case, we identified some LED lights which could be as far as 40 — 60 dB over the limit on some frequencies. In the following paper you can monitor some measurements [1] we have done ourselves under non emc lab conditions, however there is also an ETSI paper available [2], which addresses the problem.
We suggest to monitor the development in your country closely and make your own measurements, if feasible.
[1]: Initial test results (2015)
[2]: ERMTG28(11)0095_LED_invistigation.pdf (for ETSI members only)