.01 MFd, 200 volt caps from all outside connection to frame ground will take care of most of the RF hash.
Thank you. What do you mean by "outside connection"? Do you mean both the positive and negative DC outputs? Also on the AC inputs? I simply solder the cap from every lead in and out to frame ground?
Thanks!
A safety concernCaps can be freely added to the DC output lines but not to the AC input lines. If you do add caps on the AC inputs to chassis they must be Safety Rated Y-capacitors. These are required for both UL and CE certification. 250 VAC Y-caps are designed to not fail when subjected to 1500 VAC or 2121 VDC, which is a test that 100% of such certified equipment must pass. An example is the Murata DE2E3SA103MA3BT02F, 10,000 pF, 250 VAC, X1, Y2 Safety capacitor at Digikey.
https://www.digikey.com/en/products/detail/murata-electronics/DE2E3SA103MA3BT02F/106901040.01 uF as suggested by K6AER is a good maximum value. Higher capacitances, especially paralleled with those already in the power supply and other equipment on the AC circuit, can draw enough current to GND to trip GFI circuit breakers.
On the Amazon page I saw no FCC authorization on the power supply photo or the specifications. So, it may or may not have a suitable internal EMI filter. But even if it does, the allowable conducted noise may be enough to cause objectionable received RF noise. If you have RF noise issues a non-invasive solution (no AC line wires are galvanically contacted by your added filter) is to add a CM (Common-mode) filter in the form of the AC line cord being wrapped through a ferrite core. For HF the AC line cord -- all conductors including GND -- can be wrapped 8 turns though one FT240-31 or FT240-43 ferrite core. These are available at Amazon.