On 5/11/2018 2:01 PM, Michael Blake wrote:
Both have switch mode power supplies and I have never been able to
identify either as a source of noise on my Flex 5000, Flex 3000, FLEX
6300, SunSDR2 Pro, Sun SDR2 NANO, QX1R, KX3 or K3s.
That doesn't mean that they're not noisy -- most of us are surrounded by
dozens of noise sources that blend together and make any single source
hard to hear. Your monitors could be noisy, but the rest of the noise
covers it up. Have you probed around them with a portable AM radio tuned
to a clear spot near the high end of the AM broadcast band? I use a
Kenwood TH-F6A talkie, which covers from below the AM band to nearly 1 GHz.
All of us can do ourselves a favor by implementing a "search and
destroy" mission for RF noise sources. These two links provide a lot of
practical advice on how to do it.
http://k9yc.com/KillingReceiveNoise.pdf
http://k9yc.com/KillingRXNoiseVisalia.pdf
73, Jim K9YC
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