[Halld-controls] Measuring radiated noise - not

[David Lawrence]

Hi,

  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.

Regards,
-David

On 4/5/12 4:47 PM, mark stevens wrote:
> Hi Elliott,
>
> 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.
>
> Best Regards,
>
> Mark Stevens
>
> On 4/5/2012 2:08 PM, Elliott Wolin wrote:
>> Hi,
>>
>> Fernands says he currently has no good way to measure radiated noise
>> other than jury-rigging something together using a piece of wire and
>> some sort of spectrum analyzer.  Does anyone know of real system at JLab
>> that can measure radiated noise?
>>
>>
>
>
>
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