[RFI] 48v DC Clean Power Supply

[Jim Brown]

I suggest that you study the techniques in this app note that I produced 
for National Contest Journal. Chokes on cables connected to the switch 
may be able to knock the noise down enough that it isn't a problem.

http://k9yc.com/KillingReceiveNoise.pdf

You also might want to pick your battles -- 10, 12, and 15 are pretty 
dead except for occasional E-skip on 10, and are likely to remain so for 
several years. By then, maybe a new switch (or even a new neighbor). :)

If the problem is the PSU (usually most prominent on the lower HF bands 
and 160), linear PSUs can be found at the major industrial electronics 
vendors.

73, Jim K9YC

On 3/25/2020 10:24 AM, Jim McCook wrote:
> Gedas, I forgot to mention that it's a 60w switch, so most likely a 2w 
> supply would do the job.  Chuck seems to have the answer... in that the 
> problem is internal with the switch itself.  That suggests the only 
> solution is to replace it with something else, but I know the owner 
> won't do that.  I'll make an attempt to contact the mfr, Ubiquiti, but I 
> doubt that will do any good.  It seems to be another RFI dead end, 
> unfortunately.  Hard to keep up with this stuff!
> 
> 73, Jim
> W6YA
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