Andrew NBPCS-9002W Channelized Paging Repeater User Manual Exh D Chapter 2

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Document ID	48889
Application ID	/URaXdNiF+MyaJ1HEvWd5A==
Document Description	Exh D Chapter 2
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	0.65kB (8081 bits)
Date Submitted	1999-07-19 00:00:00
Date Available	1999-09-28 00:00:00
Creation Date	2001-06-11 07:06:08
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-06-11 07:06:09
Document Title	Exh D Chapter 2

AE02B-A3659 Rev --
OVERVIEW
CHAPTER 2
OPERATIONAL OVERVIEW
2.1
OVERVIEW
The SelectAmp NBPCS-900-3 Paging Repeater accepts inputs in the 928 – 942 MHz paging band, and
selectively passes one discrete channel in each band while rejecting the others. This is accomplished by
downconverting the desired signals to a 45 MHz intermediate frequency and using narrowband crystal filters
to provide adjacent channel rejection. The reverse path is not channelized, passing all frequencies in the
897 – 903 MHz band.
2.2
RF DISTRIBUTION
The amplifier contains two paths; forward for the base station to pager signal and reverse for the pager to
base station signal. The forward path includes a diplexer, low noise amplifier and splitter, channelizer,
combiner, and power amplifier. The channelizers determine the frequencies to be amplified and provide
the gain control. The reverse path includes a diplexer, broadband module (amplifier and filters), and a power
amplifier.
2.3
POWER DISTRIBUTION
Main power for the amplifier is provided by a 6.7 amp power supply operating at +15 VDC. The power
supply accepts 100 - 240 VAC inputs. This +15 VDC output of the power supply is routed to the
Control/Distribution board. The Control/Distribution board regulates and outputs the +15 volts, +12 volts,
and +5 volts to the various modules.
2.4
CONTROL/DISTRIBUTION
The operator has control over the gain and operating frequency of the forward paths, and gain only of the
reverse path. The gain setting is controlled via front panel accessible pots. The forward channel
frequencies are entered through software installed on a PC/Laptop and sent to the Control/Distribution
board. The channel setting is then sent via a three wire serial interface from the Control/Distribution to a
synthesizer in each channelizer. Each active module in the amplifier outputs status line(s) to indicate the
overall condition of the active devices. If an active device fails, the module reports a fault (red indicator)
on the front panel. The reference oscillator for the channelizer synthesizers is located on the
Control/Distribution board as well.
Document use is restricted to that described on cover
2-1

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