Uploaded August 2026 | Updated September 2026, 2 weeks ago

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In this video, I took a look at a couple of items I bought on Aliexpress.
ATX breakout board: https://s.click.aliexpress.com/e/_c3QsvwF9 4 GHz RF attenuators: https://s.click.aliexpress.com/e/_c4l4DEuX

Micsig MHO14-200N oscilloscope: youtu.be/cQeiVMRsM3Q
FNIRSI DPS-150 power supply: youtu.be/ZY2zKWzFi7E
SV6301A vector network analyzer: youtu.be/paOoDunIGSE

00:00 ATX power supply breakout board
02:13 How to power on an ATX power supply
04:14 Testing, ripple and noise
07:04 RF attenuators, S21
10:03 Smith chart, conclusions