[Elecraft] Uninterruptible Power Supply for K3S

[John Stengrevics]

Thanks to all for the comments.

Not being familiar with these things, I thought the UPS could be use for a protracted period of time.

Jim - I’ve been through the exercise of turning off every breaker in the house except the one that supplies power to the shack.  I then unplugged everything in the shack except the K3S and rotor control box and turned off the lights.  I still had the noise.

Bonding didn’t do anything - I only have the K3S, speaker and a rotor control box. 

I’ve got ferrites out the gazoo!

I live in an area with 2-acre zoning and no commercial establishment wishing a couple of miles.

So, I’m at a loss.  Maybe atmospheric noise?

John
WA1EAZ


> On Jul 11, 2016, at 3:05 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> On Mon,7/11/2016 11:36 AM, stengrevics wrote:
>> To deal with a power line noise problem, someone suggested I try an
>> uninterruptible power supply (UPS).
> 
> 
> Bad idea, for several reasons. First, power line noise is created by a defective component in the power system arcing, and radiated by power wiring close to the where the arc occurs. This radiated noise is like any other RF signal -- it propagates, and our antennas receive it. It is VERY unlikely to be conducted into our equipment via our own power wiring.
> 
> Second, UPS units are often noise sources themselves.
> 
> Third, how do you know that what you hear is power line noise? Much of the noise we hear in our radios is created by electronic equipment of all sorts.
> 
> Study http://k9yc.com/KillingReceiveNoise.pdf
> 
> 73, Jim K9YC
> 
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