Reddit mentions of stardrift 10-Pack 7mm Inner Diameter Ferrite Core Cord Ring RFI EMI Noise Filter Cable Clip Black

I've had luck with https://www.amazon.com/gp/product/B015RCYICQ/ as being a real mix (31) vs the random stuff that most are. I had severe issues of RFI coming down the power line of my two dashcams (power directly to them was fine, but ran off other power they generated lots of RFI along the cable) and I put two of these beads about 3" down the cable and eliminated almost all of the interference. I would try this on all of the cables coming into the radio. They make these in various sizes, so you might need to get multiple sizes. You can't really easily put it on something too big, but if it's too small and you have enough wire loop it around the bead and it'll do even better.

For giggles I realized I hadn't reviewed the beads yet, so here's my review I just posted with more details on my dashcam RFI experience.

It's getting harder and harder to find ferrite beads that are an actual real mix that's useful. It would be better if they told us exactly what mix this is, but per comments along with my own observations this does appear to be a 31 mix or something very similar as my dashcams were giving off really bad RFI on 2m. Several frequencies were fulll-scale interference and others were severely desensed. I started unplugging things in the car and found it was my front and rear dashcam that were causing it. Both seemed to have different impacts. The front was a wideband desense, with the rear unplugged I had issues clearly receiving repeaters, even NOAA which is SUPER strong. It kind of faded in and out etc. I then unplugged the front again, plugged the rear in. The rear was creating the spurs that was full-scale interference on various frequencies across 2m. I did not attempt to see how far it went. I started looking around to see if I could find better USB cables or a different way to power them, then thought I should try ferrite beads but I really didn't have any, all of mine are in use. So i got these based on comments that they were a Mix 31.

I started with one bead on the front camera cable and then added a second one and found it to improve things, then I plugged in the rear camera and unplugged the front again and did the same on the rear. Again, since they were creating different types of noise it was important to test them separately. I wound up putting two of these on the power cords coming into the dashcams about 3" out and that reduced the RFI to the point where if I have the squelch on my radio (Kenwood D710GA) open I can hear when the dashcams power up but no obvious interference in normal use now. I will likely get more of these to have around. Just make sure you get the right size. Looping the cable around the bead improves the choking but if you need to put this over thicker cable, cable you can't loop, coax, etc, you'll want to get the right size.