Novatel Wireless NRMUNDP-1D Manual Do Utilizador

80-VF329-3 Rev. C

20

QUALCOMM Confidential and Proprietary

The primary and secondary antenna connector locations are identified in 

. 

Integrated antenna elements are connected to the UNDP-1 module via flexible RF coaxial 
cables with Hirose model number U.FL-R-SMT connectors. The UNDP-1 RF ports are 
designed to operate in 50 

Ω systems; their inband source and load characteristic 

impedances are always 50 

Ω nominal. A 10 dB return loss or better should be maintained 

over all operating bands throughout the antenna plus cabling systems.

Three additional points are worth highlighting:

■

Use short 50 

Ω 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.

Grounding is extremely important to UNDP-1 performance. The main system ground 
connections are mechanical, implemented by the mounting holes identified in 

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 

, and the RF cable assemblies provide the RF 

return paths that are also connected to system ground.