I am currently experiencing RFI issues on 40 meters and below. Some, but
not all, of these issues are due to the Power over ethernet (POE)
switches that I am using. I have two POE switches and 2 Wirelass Access
Points (WAP). The switches are powered by a 48 volt 1.3 amp switching
power supply and can supply power to 4 of the 8 ports. I currently only
use the POW on the switch to power a network cloud key controller. The
WAP's also have a 48 V switching power supply connected to an ethernet
power inserted. So in this configuration I am using 3 of the switching
power supplys.
I am considering redoing my network wiring so I connect the two WAP's to
one of the switches (#1) and power my second switch from one of the POE
ports also on the switch. This will involve running more ethernet CAT5
cable but will get rid of 3 SMP power supplies.
I would like to replace the switching supply with a linear power supply
with a 48 vdc 3 amp supply but the lowest cost one I see runs about
$150. I have found a cheaper switching supply for $16.40 see
https://www.digikey.com/product-detail/en/mean-well-usa-inc/RPS-60-48/1866-4074-ND/7706100&?gclid=CjwKCAjwsIbpBRBNEiwAZF8-z7KemHIR0-Y6iHlnUyYMFaKFOUEIM5mTTqovlNSTq89bJMvSkC7jfRoCRcAQAvD_BwE
If you follow the link to the datasheet you will see the conductive and
radiated emissions meets EN55011 class B, but that does not seem very
acceptable from what I found on the ethernet as to the levels for a
class B device.
Is there any steps that I can take with this power supply to reduce the
radiated and conductive emissions if any? Like mounting it in a metal
EMI case, Torrids on both the input and output leads, more capacitance
on the output, etc.
Chuck K9LC
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