Re: [wsjt-devel] RFI

[Jim B. <k9...@au...>]

On 3/16/2019 11:33 PM, Claude Frantz wrote:
> Just the one: Which power supply is low noise, in the RFI sense ?

As several of my old EE and math profs often stated, "the proof is left 
to the student." There are multiple applications notes and tutorials on 
my website describing the ways in which equipment design and manufacture 
can cause or prevent RFI. k9yc.com/publish.htm

It will generally be necessary to make a careful inspection of all of 
the components you contemplate using to build your system. This is the 
sort of research that any engineer designing a system must do, so if you 
choose to go down that trail, that's included.

One of the first things to look for is cable shields and the equipment 
bonding conductor (the Green wire in NA, and the protective earth in EU) 
are all bonded to the shielding enclosure at the point of entry, that 
all module enclosures are bonded to that shielding enclosure, and none 
of these bonds are insulated by paint. There are many others. Certainly 
look for the most stringent EMC certifications by the authorities for 
your country.

73, Jim K9YC