Brian, I had something similar happen years ago. Primary issue was the
mechanical guys decided to save money and not use lock washers.
Jim Bacher, WB8VSU
[email protected]
JBRC Consulting LLC
Product EMC & Regulatory Consultant
https://www.trc.guru/ business email:[email protected]
IEEE Life Senior Member
On January 29, 2026 2:52:22 PM Brian Gregory <[email protected]> wrote:
Hi folks,
Our bare-metal prototype passed FCC Class B RE with flying colors; 8-12 dB
margin.
Now, a fairly similar unit (hey, they're prototypes) whose enclosure is
power coated is now failing by 10-20 dB. The worst failures are at low
frequencies, under 50 MHz, apparently.
Is there anything more complicated we should look at apart from the powder
coat mask not working well enough, such that covers and side panels aren't
properly grounded with all that epoxy ? What else could account for this
difference?
thanks,
Colorado Brian
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