I'm very happy with my 55A (small) IOTA converter simply connected
to my battery, and battery connected to the system bus.
I'll grant that the IOTA could have been a quieter design, but I've
had NO noise problem with it. I am always careful to connect things
properly though.
Thinking of the system bus as parallel rails, and anything connects
anywhere, is how you get in trouble with noise. The charger
connects directly to the battery, by separate #4 negative and
positive leads. The battery then connects to the system by another
set of #4 leads that run to a distribution block. I don't know
exactly what this is normally called, but it's used for high power
240 VAC wiring. It accepts two #4 feeds on each terminal, and 16 #8
leads out the other side of each terminal, with individual screws to
tighten them. Each terminal is a block of metal, roughly 1.5 x 1.5
x 2 inches.
I have no measurable hum on the bus, and none shows up on the air,
even using several different "waterfall" spectrum displays. It's
nice having a scope mounted in your repeater cabinet! :)
There are a lot of "battery chargers" out there. Automotive units
are not typically designed to be left on the battery for any length
of time. Their only real purpose is to get the battery charged
enough to start the car, quickly. They are cheaply designed, and
have no actual regulation or filtering at all. Left on a battery
for a long time, they will boil it dry.
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