Ham Radio Power Supply Noise and Mitigation Strategies

In this video I demonstrate the noise generated by three of the most popular power supplies used in amateur radio, and several strategies to mitigate that noise. The components shown in the video are linked below.

0:00 Description of test setup
1:08 ASTRON RS-35M connected directly to radio
3:03 Battery connected to radio for comparison
4:40 MIX-75 toroid on power cord
6:34 ASTRON SS-30M-AP
10:06 ASTRON SS-30M-AP with MIX-31 toroid on radio power cord
12:22 ASTRON SS-30M front vs. rear terminals
14:23 ASTRON SS-30M with MIX-31 toroid on front vs. rear terminals
15:30 Alternative common-mode choke (linked below) evaluated
17:21 Two common-mode chokes put into custom-made 3D-printed box
17:42 Alinco DM-330 MV
21:25 Alinco DM-330 MV with MIX-31 toroid on radio power
24:12 Alinco DM-330 MV with custom-made dual filter on radio power


Ferrite ring products can be found here:
https://palomar-engineers.com/ferrite...

The common-mode choke I used can be found here:
https://www.digikey.com/en/products/d...