XPost: rec.radio.amateur.moderated, aus.radio.amateur.misc
marxy's musing on technology
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QJ-PS30SWI low noise switching power supply with "noise offset" feature
Posted: 22 Feb 2022 09:20 PM PST
http://blog.marxy.org/2022/02/qj-ps30swi-low-noise-switching-power.html
In my pursuit of low receive noise I've been using a linear power supply
but the one I have makes a loud audio hum sound that is a bit annoying. Searching for low noise switching power supplies I stumbled across the QJ-PS30SWI which I purchased for AU$120 from AliExpress.The supply is quite low noise, but there are lines visible on the waterfall about every
2kHz if I turn the preamp on.Unlike
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