[RFI] Noisy PC Speakers

[Tony]

Hi Jim:

> 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.

That does seem to be the case. I returned the speakers to Amazon.

Tony -K2MO



On 9/19/2020 12:49 AM, Jim Brown wrote:
> 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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