ARLA/CLUSTER: Estudo da sociedade holandesa de radioamadores alerta que a iluminação LED pode interromper as comunicações de rádio

João Costa > CT1FBF ct1fbf gmail.com
Segunda-Feira, 29 de Outubro de 2018 - 14:26:24 WET


LED lighting can disrupt radio communications

Dutch amateur radio society *VERON* reports the current EMC standard,
developed in the last century, no longer suffices

A Google Translation of the VERON article says:

Online newspapers such as Telegraaf , NOS and NU.nl carry articles about
LED lighting that emits too much electromagnetic radiation.
The faulty LED lights disrupt wireless connections in and around the house.
Radiocommunications Agency therefore starts an investigation into 50 LED
lamp suppliers.

But also the EMC-EMF Committee of the VERON has not been idle. The
committee members have done a modest study themselves in an EMC lab.

*Elektor magazine sent 16 LED lamps *

In the April 2018 issue, Elektor has called on its readers to send out
disruptive LED lights. The VERON EMC Committee has offered Elektor to test
these lamps in an EMC lab. Elektor and VERON will soon publish the results
of this research jointly. But we can already "light up" a tip of the veil.

*EMC standard exceeded *

This small study does not focus on a specific supplier or LED lamp. But it
is a wild mix of LED lamps. From both large and small suppliers. And a part
of the LED lamps in this test appears to have exceedances of the EMC
standard.
A number of lamps do not appear to meet the EMC standard. Especially in the
aviation band. Supervisor AT (Radiocommunications Agency) does the formal
EMC tests. The VERON passes on the type numbers and brands of the
disturbing LED lighting to the AT. Then this can be included in their LED
research.

*Do only LED bulbs disturb? *

No definitely not. It is also not the LED itself that disturbs. But the
circuit in the LED lamp to make the supply voltage suitable for the LED is
often the culprit. In the photo on the right you can see that the filter
network has been omitted in an LED power supply. This saves only a few
Eurocent. But on a production of millions of devices, the saving for the
manufacturer is enormous. It is therefore no more than a simple economic
decision. Solar panel installations also regularly cause disturbances in
the frequency spectrum. Especially if they are also equipped with so-called
optimizers.

*Aren't those radio amateurs harsh?*

As early as April 2002, VERON publishes on disruptions in the frequency
spectrum. And the nokokennislink has previously reported problems with EMC.
This is about Rijkswaterstaat who experience problems when testing buoys.
Radio amateurs operate mainly close to the noise level . And every
disturbance is therefore immediately noticeable. The amateur radio
frequencies / bands are exclusively assigned to the radio amateurs. And may
therefore only be used by them (also internationally). These may therefore
not be disturbed by third parties.

*Radio amateurs provide emergency communication in case of major disasters*

Whether it is about Mexico, Sulawesi, Hawaii, the Philippines, Japan, Peru,
India, Nepal or Sint Maarten. Radio amateurs come into action at the moment
the communication infrastructure in the country is affected. By making use
of radio amateurs and their equipment, an alternative emergency
communication network can be set up in a very short time. Radio amateurs,
for example, ensure that the rescue operations, relief supplies and
evacuations start and stay. But due to the increasing disruption, this
alternative is also at risk.

*Current EMC standard no longer suffices *

The current EMC standard was developed in the 70s of the last century.
During this period the fault was caused by a vacuum cleaner or electric
coffee grinder. It was assumed that the disturbance was caused outside the
home environment. With the current equipment, the malfunction is directly
in your own environment. As a result, the current standards are seriously
outdated. And this must therefore be adapted to the 21st century. But the
industry is not waiting for an adjustment (tightening) of this standard.
Because this has economic consequences for the production of devices.

*Politics must intervene *

The politicians must take responsibility, before it is really too late. The
standardization must be adjusted to the current product range. What if the
airports decide to equip the runways with these disturbing LED lights? With
the current standards, the VHF and transponder communication can also be
disrupted.

*Demonstration in the House of Representatives *

In the Bundestag an EMC demonstration was given by our sister organization
DARC. LED lamp "on", resulting in no more reception on the DAB + radio .
The German parliamentarians did not know what they saw. That is why VERON
would very much like to give a similar demonstration in our House of
Representatives. In order to show our Dutch parliamentarians with their own
eyes what the consequences of EMC can be.

*Wireless rechargeable electric cars *

The industry is now working on a technique to charge electric cars
wirelessly. This technique is called WPT-EV (wireless power transfer -
electrical vehicle). And that works similar to the electric toothbrushes.
Only we are not talking about a 7 Watt LED light. These WPT-EV
installations have a capacity of 3 to 20 kilowatts. That is comparable with
400 to 3000 LED lamps together. There are already discussions about the
consequences of electromagnetic radiation from high voltage pylons . But
what if there is such a large magnetic field in your front yard loading
your car?

*IARU is committed to standardization WPT-EV *

The IARU (International Amateur Radio Union) is in consultation with
various international bodies in various working groups. Such as the CEPT,
CISPR and ITU-R of the UN. This is to establish standards for this new
development before it is installed in our Dutch streets. That is why we are
working on an agenda item for the upcoming WRC2019 .

VERON in Google English
https://tinyurl.com/NetherlandsVERON
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