[Elecraft] Hum coupling?

[Stuart Rohre]

The bottom line on placement of rigs to avoid hum for Elecraft, or any other
brand, is to place the transformers and switchers as far from the rigs as
possible within reason.  Use twisted pair leads from DC supplies external to
the rigs, and shield them if possible.

Alternatively (and at great cost) one could buy MuMetal to line a power
supply cabinet on the side toward the rig, but then you have a massive metal
piece blocking venting and cooling of the power supply.

As BPL trials have shown us, Power sources are sources of noise.

Rigs need low noise to have best sensitivity on receivers to work the DX.

DX means distance so keep those supplies at DX.
73
Stuart
K5KVH