On Wed, 16 Mar 2005 12:02:48 -0500, "Jack Painter"
wrote:

My question to Richard (and group) is whether there is any RF or DC link to
ground via a radio's DC-power connection to a wal-wart?

Hi Jack,

The simple boding of neutral to ground, as you offered elsewhere,
suits the RF ground path. If there's an isolation transformer, such
as may be found in the common wall wart, you may be assured that the
interwinding capacitance is suitably high enough to overcome any
notion of being isolated at RF. Precision and low noise applications
that demand higher quality isolation between primary and secondary
mandate a faraday shield between them. This shield only insures an RF
path to ground that is optimized for tight coupling - it has no other
purpose.

73's
Richard Clark, KB7QHC