[GreenKeys] Off Topic: Curly-Q light bulbs

[Bruce Gentry]

The nastiest LED installation I have encountered is some older 
conversions of traffic signals. They put out enough hash to wipe out all 
weaker FM broadcast staions and interfere with even the strong local 
ones within about 100 feet of the signal. I never tried to see how bad 
they were on HF, but it was probably horrible.  These were the older 
ones with many easily visible leds on a board that was installed in 
place of the reflector and socket in the signal. Fortunately, they 
haven't lasted very well, they develope lots of dead  "pixels" within a 
year or so and have to be replaced.  The newer ones are silent.


       Bruce Gentry, KA2IVY


On 6/10/18 7:43 AM, Steve Garrison wrote:
> That is a concern!
>
> Our radio club has a 2 meter repeater on top of Stone Mountain (since 1969) and every year the Park creates a "Christmas Tree" with strands of lights running from near the top to the ground all around the radio tower on the mountain top.  Around 1350 bulbs in the display makes for a quite impress tree for miles.  About 3 years ago they changed to LED bulbs the purchased from Home Depot.
>
> Wow, did out repeater coverage suffer!  But working with the park we were able to show them proof of the LED issue in regards to RFI.  And we worked out a temporary work around with them for the nearly two months the "Christmas Tree" is lit up (24 hours a day). They even wrote a letter to the FCC explaining the results of our study and how the two of us had worked out a yearly solution.
>
> And LED street lights were installed in my neighborhood about a year ago (one of the is at the end of my drive way) and I see no difference on the spectrum display of my FlexRadio when the street lights come on.  Sure can't say that about the fluorescent light in the laundry room right outside my ham shack!
>
> Steve G./N4TTY
> Sent from my iPhone
>
>> On Jun 9, 2018, at 4:28 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:
>>
>> Any info about RFI generation?  Important to us radio guys.
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