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question on field measurment!

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hamid_iran

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hamid_iran

How could we measure the electromagnetic field strength indoor and outdoor?
 

hamid_iran said:
How could we measure the electromagnetic field strength indoor and outdoor?
Click to expand...
By using field strenght indicator. :) No, really , I like these kind of general questions... :) How to make one, though, largely depend on what frequency electromagnetic filed is, which you failed to mention. So it can be really, relly simple or you might need professional equipment to do so.
 

I need to measure the mobile antennas field strength both indoor and outdoor.
 

I understand you would like to measure E-field strength (expressed as power density, uW/m2).

Here are a few links to RF field strength meters:

**broken link removed**
**broken link removed**
 

To my understanding, you guys implying that, there is no way of setting up our own measurement system, and have to stick to some commercial equipment!
Come on, we should be able to do better than that!
Still, waiting for help.
 

hamid_iran said:
To my understanding, you guys implying that, there is no way of setting up our own measurement system, and have to stick to some commercial equipment!
Come on, we should be able to do better than that!
Still, waiting for help.
Click to expand...
Of course that there is way of setting up your own system, but it laregly depends on frequency (in this case it is GSM so 900/1800 MHz, which is not THAT easy) and how skilfull is individual wanting to do that.
 

HI!

First of all I'd like to say that measuring field could be a rather difficult matter.
If you need to do in a "professional fashion" I suggest you to look also at:
h??p://www.ce-mag.com/archive/06/ARG/alexander.htm
just to have an idea about some standards.

If you want to do it for fun then you could use the National LMX2240 receiver.
It has a pin which is called "RSSI Out". RSSI stands for relative signal strength indicator, that should supplie a voltage that is an indication of the received signal strength.

I'm not good in electronics... but this should help.
 

Hi Hamid,

I think you should settle for a relative measurement.

on1aag.
 

Hi all,

Wow, what a discussion on this topic.........
You can easily use a measuring antenna and a calibrated RF voltmeter, a spectrum analyser, receiver or similar.
for a given dipole eg the calibrations are known or can be calculated.
The measure voltage can then be converted into E field (V/m), power (Werp) or spectrum density (W/square m)
This way is also done in the calibrated EMC chambers...


rgds
 

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