Specifications

RF Integration
Rev 2.0 Apr.10 Proprietary and Confidential 45
Positioning the DUT (Device Under Test)
To achieve meaningful results, the device must be positioned such that the peak
of the receive antenna pattern is pointed toward the source antenna.
Theoretically, the best way to accomplish this is to modify the DUT so that
antenna output is through coaxial cable. The device is then rotated until the
receive power is maximized.
Alternate path loss calculation method
Path loss can also be calculated, without modifying the DUT, by using the transmit
capabilities of the unit. This method of calculation is possible because the position
that maximizes transmitter power provides a sufficiently accurate location for
receiver desense measurements.
The unit is placed in a call and set to generate peak output power, either through
a test mode, or by configuring the base station simulator to issue the appropriate
command.
The unit is then positioned for maximum power as determined by the call box.
Sensitivity vs. frequency
For the MC57xx, sensitivity is defined as the input power level in dBm that
produces a FER (Frame Error Rate) of 0.5%. Sensitivity should be measured at
all CDMA frequencies across each band. For example, Figure 3-3 on page 46
illustrates sensitivity in the US PCS band. There are 25 physical channels with a
spacing of 50 KHz; the first CDMA channel is CH25.
For the MC8xxx, sensitivity is defined as the input power level in dBm that
produces a BER (Bit Error Rate) of 2% (GSM) or 0.1% (UMTS). Sensitivity should
be measured at all GSM / UMTS frequencies across each band.