IP Mobilenet LLC B64450G25 用户手册

 

 
 

637246.DOC  

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  The B64450G25 Base Station works within a frequency range of 450-507 MHz and requires 1/4-

wavelength antenna. 

 
 
The IPSeries Base Stations are intelligent devices designed for stringent requirements of mobile data 
communication systems.  Intended for mounting in rack units, the base station requires very little room at 
tower sites and may be connected via Serial Line Internet Protocol (SLIP) or Ethernet ports. At the 
minimum, the unit requires a 13.8 VDC power supply, an antenna system, and a high-speed data 
connection to an Internet Protocol Network Controller (IPNC) system to operate.  The base station is 
typically teamed up with a Power Amplifier (PA) and third-party system components such as antennae, 
preamplifiers, preselectors, filters, and combiners. 
 

 
 

 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Product Functionality 
 
The base station utilizes a high-performance DSP to modulate/demodulate 4 to 16-level Frequency-Shift 
Keying (FSK) modem for 25 kHz channel spacing, a multi-layered approach to signaling reliability, 
including patented multi-receiver Intelligent Diversity Reception

, dynamic scrambling, data interleaving 

for burst error protection, Forward Error Correction (FEC), and Viterbi soft-decision algorithms. 
 
The IPSeries High Speed Base Station technology includes IPMobileNet’s Diversity Reception (DR) 
capability.  Diversity Reception reduces the number of fades and the effects of multi-path reception.  With 
the use of three (3) antennae, mounted as far apart as possible on the base station tower, the Diversity 
Reception System (DRS) minimizes the effects of fading.  One of the antennae is likely to receive a viable 
signal while the others may not.  DRS minimizes fading effects by comparing the signal levels from the 
three (3) antennae, and selecting the strongest signal. 
 

 

Diversity is most effective when the vehicle using an IPSeries Mobile Radio is in motion.