[Elecraft] OT A/C RFI

[Bob McGraw K4TAX]

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
>
>