There's basically two types of RFI.
Conducted --- Being noise/RFI traveling through the wiring thus via
direct connection. Conducted RFI can be attenuated to satisfactory
levels by including a power line filter in the system {preferably at the
source}. The filter suppresses conducted noise leaving the unit,
reducing RFI to acceptable levels. It also helps to lower the
susceptibility of the equipment to incoming power line noise that can
affect its performance
Radiated --- Being noise/RFI via the wiring into the air, i.e.
transmitted. Separation of power and antenna physically is often an
improvement. Radiated RFI is usually controlled by providing proper
shielding in the enclosure of the equipment.
Regarding separate circuits, in most all cases each circuit terminates
into the service panel to which all are then common. The advantage I've
seen with separate circuits is in the distribution of neutral current.
A large unbalance in load between L1 and L2 results in a differential
neutral current. In this case, the IR value will cause the neutral to
be above earth/ground.
Often, figuring out which type and source is the challenge.
73
Bob, K4TAX
On 7/19/2017 9:52 AM, Clay Autery wrote:
Hmmmm.... Jim... I have a variable speed down-hole pump on my water
well... reckon that could cause RFI via the AC wiring?
The down-hole pump is 220VDC on dedicated circuit, and shack is on a
separate dedicated circuit from same service with separate sub-panel.
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
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