User's Manual

80-VF329-3 Rev. A 19 QUALCOMM Confidential and Proprietary
MAY CONTAIN U.S. EXPORT CONTROLLED INFORMATION
UNDP-1 Universal Notebook Data Platform User Guide RF Integration
Three additional points are worth highlighting:
Use short 50-Ohm cables for host-to-UNDP RF interconnections to minimize loss.
Losses between an antenna and the receiver degrades sensitivity; loss in the transmit
path requires additional PA output power (more DC power consumption).
Use an appropriate tool for antenna cable connections; the Hirose U.FL connector
removal tool is recommended.
If Rx diversity and GPS position location are not supported, leave the unused
secondary antenna unconnected.
4.3 Ground connections
Grounding is extremely important to UNDP-1 performance. The main system ground
connections are mechanical, implemented by the mounting holes identified in Figure 2-1.
Use these mounting holes to fasten the module to the host’s ground system. In addition to
these primary ground connections, the card edge connector provides additional electrical
ground connections as listed in Table 2-1, and the RF cable assemblies provide the RF
return paths that are also connected to system ground.
4.4 Shielding and interference
Shielding is an extension of the system ground and must be installed to prevent
interference between the host computer and the UNDP-1 platform. The platform is fully
shielded (Figure 4-1), in accordance with FCC regulations (see [4] listed in Table 1-2).