[RFI] The ARRL Contest Update for April 1, 2020

[Lloyd - N9LB]

I've recently discovered a new type of "Antique String Filament" LED bulbs
in the local stores, the internal string of many LEDs are coated with
yellow/orange phosphor to give off that "antique warm glow":

Just go to Amazon and search on:  "LED-Bulbs-Antique-Replica-Style-Light"

Maybe they are of this type?

73

Lloyd - N9LB

-----Original Message-----
From: RFI [mailto:rfi-bounces+lloydberg=tds.net at contesting.com] On Behalf Of
Hare, Ed W1RFI
Sent: Wednesday, April 01, 2020 1:30 PM
To: Rate Sheet <rate-sheet at arrl.org>; rfi <rfi at contesting.com>
Subject: Re: [RFI] The ARRL Contest Update for April 1, 2020

https://www.emcrules.com/2017/04/can-incandescent-light-bulbs-cau<https://ww
w.emcrules.com/2017/04/can-incandescent-light-bulbs-cause.html>
se.html<https://www.emcrules.com/2017/04/can-incandescent-light-bulbs-cause.
html>
[https://4.bp.blogspot.com/-9VvK7nvAz1o/WN2WAbM_aSI/AAAAAAAAAeU/rDw7H-8XND0O
8GI9djPNKX2258v62yJ9ACEw/w1200-h630-p-k-no-nu/vintage-2061732_640.jpg]<https
://www.emcrules.com/2017/04/can-incandescent-light-bulbs-cause.html>
Can incandescent light bulbs cause interference? | EMC and Regulatory
Compliance<https://www.emcrules.com/2017/04/can-incandescent-light-bulbs-cau
se.html>
Recently the European market surveillance authorities (AdCos) on EMC have
been investigating the potential of incandescent light bulbs to cause radio
interference. The investigation began with reports that some incandescent
lights may be the cause of reported interference to FM broadcast reception.
www.emcrules.com
________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of AA5CT via
RFI <rfi at contesting.com>
Sent: Wednesday, April 1, 2020 2:22 PM
To: Rate Sheet <rate-sheet at arrl.org>; rfi <rfi at contesting.com>; Michael
Germino <ad6aa at sbcglobal.net>
Subject: Re: [RFI] The ARRL Contest Update for April 1, 2020

One may, if interested, check the OFCOM website link I posted earlier and
note that picture posted is indeed an incandescent bulb.

I still have questions related to how the device produced EMI in the 119 MHz
range as indicated on the spectrum analyzer display as can be seen on the
same page.

There may have been un-intentional contact between elements within the bulb
AS this "old timey" bulb used a string (versus a coiled element) of
(presumed) Tungsten suspended from multiple 'hangers' or supports inside the
bulb. Note the hangers top and bottom share common placement within glass
top and bottom respectively. The bulb in the pix has a 'stamp' on the base
of 240V, assuming AC operation, the peak voltage on a circuit of that nature
reaches approx 340 V pk.

The question of whether a vacuum or an inert gas (as is used nowadays)
filled the bulb envelope also remains unanswered.

de AA5CT Jim

On Wednesday, April 1, 2020, 1:06:30 PM GMT-5, Michael Germino
<ad6aa at sbcglobal.net> wrote:

"Vintage" A modern bulb made to look vintage or "steampunk" may not have
been  Incandescent. Probably a "steampunk led bulb".
Mike73, AD6AA

Sent from AT&T Yahoo Mail on Android

  On Wed, Apr 1, 2020 at 3:44 AM, Rob Atkinson<ranchorobbo at gmail.com> wrote:
Sadly, the qrznow article covered everything except what is really
interesting:  the mode by which the seemingly incandescent "vintage"
bulbs radiated RFI.

73
Rob
K5UJ

Vintage light bulbs were the ultimate cause of interference to aircraft
communications in the Glasgow, Scotland airport area, but finding it made an
interesting story on QRZnow.com. Four bulbs were all it took to be a real
problem.
https://qrznow.com/ofcom-engineers-shine-a-light-on-interference-issue/
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