[RFI] a small win in the RFI project: LED traffic signal

[Gary Smith]

Outstanding job with great resuts.

Gary...wa6fgi

On 1/17/2019 1:58 PM, bill K7WXW wrote:
> My RFI battle continues unabated. While I've quieted most of the 
> sources in the house (I still have to figure out how to tame the HVAC 
> system), external noises sources continue to accumulate.  There are 
> days, when the powerline buzz sets my baseline noise level at -80dBm, 
> that I fantasize about buying ten acres in eastern Oregon, putting up 
> a tower and running a remote station full time...
>
> That said, I have a small victory to share.  I had a noise source that 
> I could hear from 10 to 150 MHz. It pulsed and clearly seemed related 
> to something turning on and off. Last weekend, while I was out hunting 
> another source, I figured out that it was the traffic signal on the 
> corner (we will ignore the fact that this took me a year to 
> realize.).  I called the city traffic department, which responded, 
> within a couple of days. I talked to a city electrician who told me 
> that several of the lights were LEDs with built-in power supplies.
>
> He came by yesterday. Fifteen minutes of working with him convinced 
> him that the LEDs were the source. This morning he pulled the LED 
> units and installed incandescent lights. As soon as I confirmed that 
> the change solved the problem, he asked if I would help them find a 
> filtering solution because, at some point, the LEDs will be back.  Of 
> course I said yes.
>
> So that's a pretty good outcome, and fairly quick, too.
>
> 73 de Bill K7WXW
>
> ______________
> brevity is beautiful.
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