Path Loss Calculation - Sierra Wireless MC5725 Hardware Integration Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
44
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Lindgren. This does not provide power to the same accuracy
as a full‐size anechoic chamber, but is sufficient for this appli‐
cation. A base station simulator, such as an Agilent 8960
(shown) or Rohde & Schwarz CMU200, is used to provide FER
(Frame Error Rate) measurements.
Figure 3-2: Anechoic chamber
Approx . 1 m

Path loss calculation

The chamber is calibrated for path loss using a reference
antenna with known gain that is feeding a spectrum analyzer
or power meter. This makes it possible to determine the
radiated power available to the receiving antenna and the path
loss:
Radiated Power =
Path Loss =
Note: It is not necessary to know the gain of the transmitting antenna;
it is included in the path loss.
Proprietary and Confidential
Agilent 8960
call box
Measured received power
+ Any cable losses
- Reference receive antenna gain
Radiated power
- Input power
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