Severe MW interference solved - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Jon_G4MDC · 8th Jul 2021, 11:57 am

An interesting new topic has developed here - can an incandescent lightbulb oscillate and produce RF?

There are some posts in the foregoing which clearly show LEDs - these are something entirely different. The Ofcom report showed a filament bulb (below) being held to be responsible for interfering with airband.

I would like to continue that discussion in another thread. I have some almost identical bulbs on which I might try experiments. It doesn't belong here in Vintage Radio (domestic).

Mod's please could you oblige? thanks.

Radio Wrangler · 8th Jul 2021, 12:54 pm

OK, a new thread opened for RF from incandescent filament bulbs.

https://www.vintage-radio.net/forum/...d.php?t=181759

I've put nothing other than an intro in it, because if I did, the forum software would position it ahead of the intro... it's very punctilious about timestamps!

I think your thread has come to a satisfactory conclusion, but anything on filament bulbs should go in the new thread where it can be found by searchers.

David

McMurdo · 8th Jul 2021, 1:44 pm

I assume branded led bulbs are compliant with relevant RFI standards, but suppose directly imported online bulbs simply don't bother.

A takeaway in a neighbouring town has recently decorated their front window with LED strips including an 'OPEN' led sign and when I drive past it makes my car radio erupt in whistles and buzzes, and that's on FM.

Jon_G4MDC · 8th Jul 2021, 6:58 pm

Thanks for opening the new thread requested David.

I'm not sure why the link behaves the way it does.
When I click it it behaves as if it's me that is posting a new thread. Was that as it should be?
I can't see any intro. tnx

Radio Wrangler · 8th Jul 2021, 8:15 pm

Looks like my fault. I was creating the new thread in a separate window and I guess I must have not saved it before closing. Thread created and the url in post above has been edited. Sincere apologies.

David

bobhowe · 9th Jul 2021, 8:21 pm

Hi. I've been very lucky with MW interference regarding LED light bulbs as I use Philips Hue, hope I don't go OT. The worst thing I have had causing interference is a variable temperature soldering iron, wipes all of MW when switched on and an AAA battery charger, hissing when switched on.

Kind regards, Bob.

clockman · 21st Jul 2021, 9:27 pm

As re my early thread the level of interference in my house is very high in most parts so today i had a thought i took one of my repaired Vidor Lady Margaret CN429 battery radios down my large garden and tested it on M/W & L/W the reception was crystal clear on all stations no interference so maybe i should do it with all my sets to test there sound quality. Just a idea.TAB

8th Jul 2021, 11:57 am	#21
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Severe MW interference solved An interesting new topic has developed here - can an incandescent lightbulb oscillate and produce RF? There are some posts in the foregoing which clearly show LEDs - these are something entirely different. The Ofcom report showed a filament bulb (below) being held to be responsible for interfering with airband. I would like to continue that discussion in another thread. I have some almost identical bulbs on which I might try experiments. It doesn't belong here in Vintage Radio (domestic). Mod's please could you oblige? thanks. Attached Thumbnails

8th Jul 2021, 12:54 pm	#22
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,866	Re: Severe MW interference solved OK, a new thread opened for RF from incandescent filament bulbs. https://www.vintage-radio.net/forum/...d.php?t=181759 I've put nothing other than an intro in it, because if I did, the forum software would position it ahead of the intro... it's very punctilious about timestamps! I think your thread has come to a satisfactory conclusion, but anything on filament bulbs should go in the new thread where it can be found by searchers. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done Last edited by Radio Wrangler; 8th Jul 2021 at 8:13 pm. Reason: url for new thread fixed

8th Jul 2021, 1:44 pm	#23
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,270	Re: Severe MW interference solved I assume branded led bulbs are compliant with relevant RFI standards, but suppose directly imported online bulbs simply don't bother. A takeaway in a neighbouring town has recently decorated their front window with LED strips including an 'OPEN' led sign and when I drive past it makes my car radio erupt in whistles and buzzes, and that's on FM. __________________ Kevin

8th Jul 2021, 6:58 pm	#24
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Severe MW interference solved Thanks for opening the new thread requested David. I'm not sure why the link behaves the way it does. When I click it it behaves as if it's me that is posting a new thread. Was that as it should be? I can't see any intro. tnx

8th Jul 2021, 8:15 pm	#25
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,866	Re: Severe MW interference solved Looks like my fault. I was creating the new thread in a separate window and I guess I must have not saved it before closing. Thread created and the url in post above has been edited. Sincere apologies. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

9th Jul 2021, 8:21 pm	#26
bobhowe Heptode Join Date: Jun 2005 Location: Sunderland, Tyne and Wear, UK. Posts: 661	Re: Severe MW interference solved Hi. I've been very lucky with MW interference regarding LED light bulbs as I use Philips Hue, hope I don't go OT. The worst thing I have had causing interference is a variable temperature soldering iron, wipes all of MW when switched on and an AAA battery charger, hissing when switched on. Kind regards, Bob.

21st Jul 2021, 9:27 pm	#27
clockman Pentode Join Date: Jul 2020 Location: Borehamwood, Hertfordshire, UK. Posts: 216	Re: Severe MW interference solved As re my early thread the level of interference in my house is very high in most parts so today i had a thought i took one of my repaired Vidor Lady Margaret CN429 battery radios down my large garden and tested it on M/W & L/W the reception was crystal clear on all stations no interference so maybe i should do it with all my sets to test there sound quality. Just a idea.TAB