Hi all,
So when I upgraded to a dual camera setup and mounted the rear dash camera to the rear glass in-between the defrost lines, I found that I had lost all DAB reception. Recently I tried to buy some ferrite cores and mounted them on both ends of the USB cable and still had no reception. I'm also aware that there are some dash cameras companies that advertise that they have eliminated DAB interference but they want you to spend £200 or so on their new systems. 🙄
I got to experimenting and removed the mount, left the DAB radio on and then moved the rear dash camera while it was on, all over the rear glass to figure out where it cut off the DAB reception. If you mount anywhere on the glass you were going to cut off the signal. I found a nice spot (or so I thought) just underneath the top brake light right up at the edge of the plastic trim, but the problem was that my specific dash camera has a straight cable going out instead of something like a right/left-angle cable (and it's really not so easy trying to find a 6m left-angle to right-angle mini USB cable), so when I opened the boot door it would brush up and against the cable. If I had shut it without looking I'm pretty sure the cable would've been caught between the boot opening and damage both the cable and camera. Then there was another issue, that area below the top brake light gets really hot under the sun, so if you had a weak adhesive on the mount it'll probably fall off over time but the final problem was running the cable back to the C-pillar. I used the provided clips and mounted the USB cable to the top of the plastic trim and that's when the signal cut out again. I tried to shield the wiring using some layered aluminum foil (which I had planned to wrap around the USB cable if it had worked), unfortunately that didn't work and I'm aware that there are some EMF tape but those are very expensive to buy and experiment with. I've already wasted money getting various ferrite cores. Ultimately it looked like this wasn't going to work with any powered USB cable mounted on the plastic trim or rear glass, it all just seems to interfere with the DAB reception.
My working solution was something I had found on a bimmer forum.
Using what I had available I made this bracket (from a spare joist hanger bracket, lots of hammering, bending and satin black spray paint).
Here it is fitted, off centre as there is a plastic trim clip holding up headliner.
And here it is with the dash camera fitted and the cable tucked into the headliner and into the C-pillar.
I might take it back out and re-adjust the angle so that it fits into the headliner better (or remake it entirely). The only issues I have is that the rear view is off centre and further back than before. The view is also slightly obstructed by the upper brake light cover and parcel shelf. However I have full DAB reception now with this set up, so I can listen to some tunes other than my own (and traffic announcements). 😁