[Elecraft] RFI on K3s

[Marc Veeneman]

My PowerWerx supply DOES generate those drifting noise spikes, ruining CW on 80 meters for me.  I have yet to find a 13.8 volt switching supply that can provide 25 quiet amps.  I've gone entirely to batteries rather than use quiet but inefficient linear supplies. 

 Now I only have SMPS noise when recharging the batteries.  So I leave that for non-hamming hours.  More testing is needed, but I did find one SMPS for LiFePO4 batteries that seemed RFI free.  It's an Optimate brand product but only produces 5 amps.
-- 
Marc  WW8SDG

> On Jun 20, 2016, at 7:45 AM, Drew AF2Z <pubx1 at af2z.net> wrote:
> 
> I have a Powerwerx SS-30DV also. I think it is unlikely that this PS would put out that kind of trash. I've found it to be very quiet even listening with an endfed wire antenna within inches of it.
> 
> 73,
> Drew
> AF2Z
> 
> 
>> On 06/20/16 01:38, Clay Autery wrote:
>> That's what I figured... Now to locate which one of the 50+ that are
>> present in this house alone...
>> 
>> They actually appear all the way down into the 14MHz range...  Always
>> there.  Tonight they were relatively stable in location... drifting
>> slowly, and even changed directions once.  At other times, the cyclical
>> migration up or down the band is faster and sometimes random, switching
>> directions repetitively and without discernible (to me) pattern.
>> 
>> Off to read...  Hopefully it is not the power supply I use for the K3s/P3...
>> 
>> 
>> 73,
>> 
>> ______________________
>> Clay Autery, KY5G
>> MONTAC Enterprises
>> (318) 518-1389
> 
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