[Public-List] LEDs and interference

George Dinwiddie gdinwiddie at alberg30.org
Sat Aug 25 09:53:00 PDT 2018


Stephen,

On 8/25/18 12:58 AM, Stephen Gwyn via Public-List wrote:
> Just noticed that the masthead LED not only infereres with the VHF (not
> surprising, the antenna is right next to it) but also the AM/FM radio (more
> surprising, the antenna is 40 feet away).
> 
> I'm now wondering if the interference is through the wires. I hope so.
> Otherwise the interference would be there if your neighbor had a bad LED.
> Conversely, my bad LED night be affecting my neighbor.

If RFI is being transmitted down the wires to affect your radio, it's 
also radiating from those wires which act as an antenna. That the reason 
for FCC part 15, to prevent interference with neighboring use of the 
airwaves.

  - George

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