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Hi,<br>
<br>
This may be a silly question, but can't we just hook a cell-phone
antenna to an oscilloscope with a FFT feature? The antenna are
designed based on a fractal pattern and so have are sensitive to a
very wide range of frequencies, but are compact and so can be used
to localize the source to a smaller area. We'll have portable scopes
around anyway.<br>
<br>
Regards,<br>
-David<br>
<br>
On 4/5/12 4:47 PM, mark stevens wrote:
<blockquote cite="mid:4F7E04FE.2010000@jlab.org" type="cite">Hi
Elliott,
<br>
<br>
The spectrum analyzer with a hand-made antenna is all I have seen
used here at Jlab. I did a property search with the terms "emi"
and "noise" and saw nothing. I have previously used a portable
AM radio, tuned between stations, to pick up noise - it is
remarkably sensitive (it will pick up SCR noise, for example, like
that coming from light dimmers or switching power supplies).
There are commercial products that are "EMI Noise Analyzers", but
they are expensive. Some companies will rent them.
<br>
<br>
Best Regards,
<br>
<br>
Mark Stevens
<br>
<br>
On 4/5/2012 2:08 PM, Elliott Wolin wrote:
<br>
<blockquote type="cite">Hi,
<br>
<br>
Fernands says he currently has no good way to measure radiated
noise
<br>
other than jury-rigging something together using a piece of wire
and
<br>
some sort of spectrum analyzer. Does anyone know of real system
at JLab
<br>
that can measure radiated noise?
<br>
<br>
<br>
</blockquote>
<br>
<br>
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