[Elecraft] Uninterruptible Power Supply for K3S

[Barry LaZar]

John,
     You can use an UPS for a protracted period. My whole shack is 
buffered on the one cheap UPS I bought at Staples. I suspect that the 
size of the battery will only allow for about 10-15 minutes of operating 
after I lose power. But, it's on continuously.

         From your description of your situation I would guess there are 
just a few possibilities, arcing from a power line that is within radio 
line of sight to your antenna, someone may have an electric fence to 
control animals, a compressor/air handler controler. or one of your 
neighbors is doing some arc welding. You can eliminate atmospheric noise 
if it is steady and doesn't vary like  lightning crashes; this time of 
the year there is a lot of atmospheric noise, but it bounces around in 
amplitude.

     If you have a 2 meter rig that can tune down in the aircraft 
frequencies, tune it to a dead spot between 113-136 MHz. You will be in 
AM mode. Turn off the squelch and ride around and see if you can find 
the source of some noise. It could be a few miles away from your antenna 
depending on how high your antenna is.

73,
Barry
K3NDM



------ Original Message ------
From: "John Stengrevics" <jstengrevics at comcast.net>
To: jim at audiosystemsgroup.com
Cc: elecraft at mailman.qth.net
Sent: 7/11/2016 3:38:52 PM
Subject: Re: [Elecraft] Uninterruptible Power Supply for K3S

>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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