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" <jstengrev...@comcast.net>
To: j...@audiosystemsgroup.com
Cc: elecraft@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 <j...@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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