[RFI] Noisy PC Speakers

[Grant Saviers]

Plus they might use a class D amplifier which can be a great noise source.

Grant KZ1W

On 9/18/2020 21:49, 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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