User's Manual

Table Of Contents
RF Specifications
Rev 4 Sep.11 Proprietary and Confidential - Contents subject to change 41
Note that antenna impedance affects radiated emissions, which must be
compared against the conducted 50-ohm emissions baseline. (AirPrime
embedded modules meet the 50-ohm conducted emissions requirement.)
Radiated sensitivity measurement
A wireless host device contains many noise sources that contribute to a reduction
in Rx performance.
To determine the extent of any receiver performance desensitization due to self-
generated noise in the host device, over-the-air (OTA) or radiated testing is
required. This testing can be performed by Sierra Wireless or you can use your
own OTA test chamber for in-house testing.
Sierra Wireless’ sensitivity testing and
desensitization investigation
Although AirPrime embedded modules are designed to meet carrier requirements
for receiver performance, they are still susceptible to various performance
inhibitors.
As part of the Engineering Services package, Sierra Wireless offers modem OTA
sensitivity testing and desensitization (desense) investigation. For more
information, contact your account manager or the Sales Desk (see
Contact
Information on page 4).
Note: Sierra Wireless has the capability to measure TIS (Total Isotropic Sensitivity) and
TRP (Total Radiated Power) according to CTIA's published test procedure.
Sensitivity vs. frequency
For CDMA bands, 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 LTE bands, sensitivity is defined as the RF level at which throughput is 95% of
maximum.
Supported frequencies
The MC7750 supports:
Single-band LTE See Tabl e 5-1 on page 42.
Dual-band CDMA See Ta ble 5-3 on page 42.
GPS
Radio transceiver requirements for 3GPP Release 7