New mount coming and going to redo my power setup for various reasons, and was going to get a linear, regulated DC power supply instead of switched because, well, cleaner power cannot hurt. Might not help, can't hurt.
In reading though I see all sorts of horror stories about the PWM Dew Controller impact on shared DC circuits, and cautions to use separate DC power supplies for dew controllers.
Let's set aside for just a moment how much concern they merit, and assume some concern is merited from the common mode noise (not radiated RF, since a separate power supply would not help anyway there).
I have a Pegasus Pocket Powerbox Advance used as a dew controller, and also to distribute power to a couple other devices (NUC and Router, in the new variation NOT the mount or cameras). It is a little more than a regular dew controller -- maybe.
My question is this: If there is some degree of noise caused by PWM for dew control, and a device like this (or specifically on this device), does it impact power split off BEFORE the PPBAdv?
I'm thinking the answer is yes -- it does not look like the Dew Controller would be any different, just because packed in a group of other features.
So if (for the moment let's assume) a PWM Dew Controller does generate common mode noise, my only solutions are:
1) Some kind of isolation (what?)
2) Separate power supply on AC (easy) and separate battery in the field (harder), or
3) Run the Dew Heaters on full power.
Am I thinking about this correctly?
I do not have any kind of useful test gear to find out reality. Incidentally, I asked that we assume PWM is a problem -- I'd welcome input on that also, but I really would like first to know that ASSUMING it generates DC line noise, what solutions I have.