On Thu,8/25/2016 8:18 AM, Frank N. Haas KB4T wrote:
Regrettably, the SDR system has proven nearly useless for my intended
purpose. Sometimes I can hear the arcing source but it never shows up on
the spectrum displays.
Several thoughts, Frank. First, and most important, spectrum displays
are VERY VERY helpful in tracking noise that has any degree of coherence
or is spectrally repetitive. These are characteristics of ELECTRONICALLY
generated noise, but NOT of impulse noise.
Second, averaging is a very powerful tool for separating coherent noise
from random noise. A spectrum display of noise is generally most useful
with averaging set to a relatively number, and the amplitude and scale
set so that random noise causes the display to go black and the signal
(noise) fills the amplitude.
Third, SDR Play is not the only good choice -- there are many SDR
receivers that can easily be connected to a computer and run from a
vehicle, and some have greater dynamic range than others.
Fourth, overload can easily be eliminated by use of a simple resistive pad.
Fifth, as W0QE and W0IVJ showed in their plots, there are also noise
sources in a vehicle. BTW -- they shared their work with me, and allowed
me to include it in a tutorial wrote this spring.
http://k9yc.com/KillingReceiveNoise.pdf
73, Jim K9YC
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