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Re: [RFI] Noisy PC Speakers

To: Rfi List <rfi@contesting.com>
Subject: Re: [RFI] Noisy PC Speakers
From: Tony <73guddx@gmail.com>
Date: Sat, 19 Sep 2020 18:28:13 -0400
List-post: <mailto:rfi@contesting.com>
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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