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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