Date
1 - 20 of 25
Beware of LED lamps!
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Klaus Brosche, DK3QN
GE, After having finished the solder work and DC voltage and current measurements of a 2-tone audio generator, a kit offered by the |
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Francesco Di Giovanni
I agree.
Further they last less than the incandescente bulbs, despite the claims of manufacturers! 73 Francesco, IN3XZP |
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Mark Wickens <mark@...>
Our bathroom lights are led and splatter s6 noise on VHF and all over the place! Mark On Thu, 29 Oct 2020, 14:51 Francesco Di Giovanni, <fdigio1@...> wrote: I agree. |
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Simon
All my house is led..zero noise..
Lesson learnt ages ago..BUY form electrical distributors ( ones that sell to electricans and trade.) NOT general hardware super stores.. G0zen |
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Mark Wickens <mark@...>
Yes indeed a lesson I have now learned. On Thu, 29 Oct 2020, 18:36 Simon, <ohhellnotagain@...> wrote: All my house is led..zero noise.. |
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Klaus Brosche, DK3QN
Any particular brands recommended?
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Klaus, DK3QN Am 29.10.2020 um 19:36 schrieb Simon: All my house is led..zero noise.. |
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Simon
Your in Germany..I am in Uk..so not sure if available..
But ones I have are NOT China made.. Go to electrical distributors ( proper one.) explain the issue and am sure they will take back if no good..thats what i did.. Also cheap as chips from above..cheaper than rip off high street hardware super stores.. G0zen. |
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Alain Reiner <alain@...>
Hello all,
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the problem is not from the LED itself, but from the crappy switching power supply within the lamp. So, it can be true with any switching PSU you can get. When I purchase one, I test immediately : I power it up with a load near my favorite receiver (my DUO, of course) and I look at the noise level... Best 73, Alain F4HFS Le 29/10/2020 à 21:05, Simon a écrit :
Your in Germany..I am in Uk..so not sure if available.. But ones I have are NOT China made.. Go to electrical distributors ( proper one.) explain the issue and am sure they will take back if no good..thats what i did.. Also cheap as chips from above..cheaper than rip off high street hardware super stores.. G0zen. |
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Klaus Brosche, DK3QN
Thanks for the hint.
Just looked FEIT up on amaz and eB:
pretty scarce offers here in DL land.
Will try one or 2 of these FEITs :-) and possibly Philips and OSRAM. 73, Klaus, DK3QN
Am 29.10.2020 um 22:37 schrieb Mike via
groups.io:
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AndersH
Hello Klaus,
In the coming weeks, I plan to report a LED-decorative lighting strip to the electrical compliance authority in my country, Sweden. There are no guarantees that anything will happen, but they do encourage reports of radio emission issues from the general public. The precondition is that their e-service is used according to their instructions. There is no "hotline" by phone, but the e-service is the second best thing in my opinion. Maybe similar possibilities exist also in Germany? All the best! Anders H. SM6-8439 |
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Klaus Brosche, DK3QN
Hi Anders and group,
Yes, there are similar ways of
adressing such kind of issues here in DL to the German "BNetzA".
However, I would rather address the
issue first to the seller, which I will do.
I'd assume that particular LED lamp is
made in far east and may show up for sale at places
all over the world. Here is the link to that lamp sold by a
company here in DL:
Klaus, DK3QN
Am 29.10.2020 um 22:53 schrieb AndersH:
Hello Klaus,
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Chris Bartram
Simon G0ZEN wrote:
All my house is led..zero noise..I'm not naming names, but in the UK also beware of those places which masquerade as trade outlets but try to sell everything to everyone. It's the specialist outlets, who as Simon says, deal with real electricians and others who have experience and training. Chris G4DGU -- Chris Bartram G4DGU |
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AndersH
Hello Klaus,
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A friendly dialogue with the shop or the importer, is of course desirable, especially of the seller in Germany is acting in good faith In comparison, this is not the case in my own situation., because the retail chain has earlier promoted their skills and determination in screening electrical goods from the far east with respect to EMC and have even showed photos of log periodic EMC test house antennas in their marketing material. My conclusion is that my supplier is not acting in good faith since they know better. All the best! Anders H. On Thu, Oct 29, 2020 at 11:13 PM, Klaus Brosche wrote:
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Klaus Brosche, DK3QN
Hi Anders,
My particular lamp, of course, has the
'CE' label sticker at the bottom of the stand ;-)
However, the 'CE' logo printing is not as it should be (incorrect spacing between letters 'C' and 'E') :-)) Anyway, I will check things with near
field probes and my SpecAn as soon as I have
finished my current repair works. Stay safe!
Klaus, DK3QN
Am 30.10.2020 um 08:28 schrieb AndersH:
Hello Klaus,
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Kjell-Goran SM4GRP
Helli all A couple of years ago there was a description of a led interference tester in the monthly swedish ham radio magazine QST. I built such a device and measures hf conducted emission from our leds or switched ps. Some are good, some are bad. Please have a look on this video 73/Kjell-Goran SM4GRP |
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Klaus Brosche, DK3QN
Hi Kjell-Goran, SM4GRP,
Thanks very much for the link to the YT
video. Very educational!
Good news from that is: there seems to
be LED lamps with an EMI quiet
behavior. In short: it's all around the matter of
how the AC to DC converter/step-down
converter is implemented with regards to EMI. And it's not a matter of these LED cells themselves as these are driven by DC current. In the case of a single bulb, there is
no work-around if that is causing EMI.
In case of a lamp like mine, I'd see
some work-around (theoretically for now)
by eliminating the switching type AC/DC converter with a conventional transformer-based PSU. Even for the 30 LEDs in my lamp the tranformer wattage should be quite low and a conventional transformer-based DC voltage supply may fit into the foot stand of that lamp. If I have some leisure time I will
investigate this possibility further, as I do
really like this particular lamp for its ability to provide a well illuminated working area plus the assistance of that adjustable magnifying glass making details much more visible to the eye. In any case: Thanks again for your post
and the link!
73, Klaus, DK3QN
Am 30.10.2020 um 13:21 schrieb
Kjell-Goran SM4GRP:
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Simon
That video is well out of date..the bulbs are BIG!! Also its old news..
THOUGH proberly new news at time video was made.. Only real way now days to test is to buy one and see what happens.. Problem is..if your neighbours have bad led bulbs what do you do?? ( or bad phone charger, scooter charger..tv psu , fridge, cooker etc..) The rf interference from the smpsu in the bulb ( or any smpsu) is mainly radiated by the mains supply.. one can filter the mains into your rig, but that does not work well.. Remote sdr rx operation for urban qth may be the only way in the future.. If one belongs to a radio club then a group buy/ hire of land ( on a farm?) with remote web sdr is a possible answer.. Modern electronics is killing ham radio..but it is a non win situation..no one cares about ham radio..99% of people do not even know what it is! I am actively looking for somewhere to install a hermes lite 2 and active loop . Far from urban life.. By the way I repair BIG smpsu’s for my job..9kva upwards..I know the problems with them..it only takes the manufacturers to save $1 on a $500+ smpsu to cause havoc on lf-hf..And believe me they do!! The Eu does not care..people do not care..all people care about is that it is cheap and works.. Active loop antennas can help..null out the noise, but only from one source..( i use mag trx loops and active rx loops here in london.) Good luck..WE all need some in this war of noise.. Mag loop Simon g0zen.. |
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Kjell-Goran SM4GRP
Simon, Having worked with CE in EMC labs I still find this simple little device (together with a sdr radio) useful for sorting out bad stuff. I live in the countryside and I decide pretty much myself on my rf environment. LEDs come in many sizes. Big or small, what does it matter? What matters is of course the drive curcuit. Unfortunatly the CE marking is no guarantee these days. 73/Kjell-Goran SM4GRP |
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Simon
Hello
Its not ment as a put down..things may well be different in different countries.. I am sure its useful for you.. I envie your location!! Here in London I am surrounded by noise..even the street lamps are led..so problems here are one cannot do anything about one neighbours lighting etc..one has to act on the rx side of things..chokes on mains cables, coax etc..( even if own house is rf clean..) Sorry if I offended you, not intensional..regards stay well Simon |
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Kjell-Goran SM4GRP
Simon, No problem at all. RF pollution is a big problem, at least for hams, and every discussion on the subject is welcome. Tips and tricks on how to tackle the problem and how to address the authorities are also good. I have seen both good and very bad LEDs and switched PSes in my own home. A cheap PS for my wife's laptop was a disaster. The original brand was very good. It was not a problem to get my money back when I returned it together with a spectrum plot and some questions on their CE marking.
Hope to meet you on the air 73 / Kjell-Goran SM4GRP |
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