Geoffrey S. Mendelson wrote:
I have a microwave leakage tester. It is calibrated for 2450 mHz, so it should
be perfect for testing WiFi Network output power. It is calibrated in mw/cm2
(miliwatts per square centimeter). It is also ham related as I am limited to
100mw EIRP on the 2.4gHz ham band.

So I figured that I could use it by measuring the field strength at a specific
distance from the antenna, and then applying a conversion factor.

Anyone have any ideas?

Thanks,

Geoff.

The "near field" analysis feature of EZNEC or other modeling program
will tell you what field strength in V/m you should expect from an
antenna at any specific point in space, if you're able to model the
antenna with the program. Power density (mW/cm^2) will be meaningful
only if the observation position is in the far field, which is very
little distance away at that frequency, but the "near field" analysis is
valid also in the far field. For the conversion, use the relationship
that the power in watts = V^2/377 where V is the field strength voltage
in volts, or mW/cm^2 = (V/m)^2/3770. Again, this measurement is made in
the far field, which is typically any distance greater than a fraction
of a wavelength from the antenna. If your antenna is fairly simple, the
free demo version of EZNEC is adequate to do the modeling.

Roy Lewallen, W7EL