Orolia GSG-5 Series, User Manual With Scpi Manual, Page: 41 / 392

Antenna gain: 0 dB (omni antenna)
Cable loss, antenna to GSG: 0 dB (no cable used)
Using the free space loss calculation for radio propagation:
Loss (dB) = 20 log10 (4
ᴫ
* Distance /
λ
)
Where
λ
= wavelength: @ 1575 MHz= 19 cm = 0.62 ft
Distance = 200 ft total => 100 ft from antenna exterior wall + 100 ft to restric-
ted perimeter
Loss = 72 dB = 20 log10 (4
ᴫ
* 200/0.62)
Using the free space calculation is a worst case scenario as the wall and any other obstruc-
tions will likely reduce the signal even more. Therefore, setting the power output of the
GSG to:
-140 + 72 = -68 dBm or less will guarantee compliance.
For additional information on path loss, see e.g., this third- party reference
1
:
http://en.wikipedia.org/wiki/Path_loss
1
This link is provided for reference purposes only. It leads to a web page that is not maintained or supported by Orolia.
2.5 Signal Power Level Considerations
User Manual GSG-5/6 Series Rev. 27 25