Dear CSD Practitioners,
I have had 3 recent instances of AM Radio interference crop up. All involve Red Line processors (with Dante cards, not that it should matter), all 3 in completely different geographic locations (in fact, different states in the US), and all with AM Radio stations coming in on analog mic lines. It is generally the longer cable runs - not so much the shorter cables. This seems odd to all of the sudden get 3 in close succession (2 different contractors).
The first one that came up a couple months ago, the contractor had not run new cable and I dismissed it. The second one was in a location within a block of an AM Radio Station transmitter and again, I blamed it on close proximity and a local condition. The contractor added lots of filters and cleared up enough of it to be 95% masked - i.e. passable. This last one I just now heard about is not near any known radio transmitter.
Now I'm wondering. I have never experienced this before with any Bose front end electronics, so I'm wondering if anyone else has run into this with the fixed I/O processors? In a past life with non-Bose mixers and processors, I used lots of individually shielded and jacketed multi-cables with an overall shield and jacket as a preventative step. While I only had trouble in an extremely few sites - and after exhausting all other possibilities like differences in ground potentials, bad solder connections, and the other usual suspects, finally connecting the drain wire on one end of the overall shield generally eliminated this issue. But in these recent 3 instances - with brand new 100% foil shielded cable over 22 AWG twisted pair conductors installed, connected to new properly installed and wired wall plates, this is suddenly popping up.
Any ideas, comments, suggestions? Is it just a bad dream?