[RFI] Noisy PC Speakers

[Jim Brown]

Hi Tony,

Several years ago, W6GJB told me about his experience with a pair that 
powered off of USB. The DC-DC converter was the culprit. I would expect 
ANY device that powers from USB to have that sort of problem unless the 
designer has taken great care to avoid it. You MIGHT be able to reduce 
the noise with serious chokes on the cables. See my tutorial on Killing 
RX Noise.

73, Jim K9YC

On 9/18/2020 9:10 PM, Tony wrote:
> All:
> 
> Purchased a set of USB-powered PC speakers which turned out to be very 
> noisy on HF. The speakers are made by Mica model PB20i.
> 
> See: 
> https://www.amazon.com/gp/product/B07VTS62L6/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 
> 
> 
> Tony - K2MO
> 
> 
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