Jim Brown wrote:
One other important point. Twisted pair is well known for rejecting
RFI, yet power cords for ham gear have traditionally used parallel
conductors. The same is true for loudspeaker cables. That's two more
For power cables, there might be some benefit if there was a problem
from a co-sited transmitter, but one would need a common mode choke at
the equipment end, and unless the power supply was well balanced or
differential mode filtered, at the power supply end. For transmit,
your biggest source of differential mode power supply noise is your own
PA stage, so, unless you have good decoupling internally, I don't see
that it would help to balance the external lead.
My suspicion is that good differential mode filters on the input might
be a better approach.
standards worth changing.
Headphones might benefit, but you would need a common mode choke, or an
output transformer. Also, I suspect that headphone lead pickup tends to
get injected in common mode.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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