AE04B-A0279 Rev -- DESCRIPTION
Document use is restricted to that described on cover
1-1
CHAPTER 1
DESCRIPTION
1.1 OVERVIEW
The SelectAmp CDMA 800 bi-directional channelized amplifier provides selective frequency amplification of
user specified frequencies in the SMR, Cellular, and ESMR bands. This unit will selectively filter for one 1.25
MHz or 5 MHz channel, depending on the part number ordered, in the Uplink and Downlink band as
determined by the operator. Frequency selection, gain adjustment and fault monitoring is accomplished with
monitor and control circuitry and firmware.
Within this manual, Uplink refers to the RF signal path from the mobile unit to the base station (Donor Cell)
and the Downlink refers to the RF signal path from the base station to the mobile unit.
1.2 ELECTRICAL SPECIFICATIONS
Table 1-1 below contains the electrical specifications for the Channel Selective Amplifier.
Table 1-1 Electrical Specifications
Parameters
Specification
Frequency Range
800 MHz Cellular
Uplink Downlink
824 – 849 MHz 869-894 MHz
Power
Three wire, 90 to 260 VAC @ 200 watts.
SAW Filter 3 dB Bandwidth
1.5 MHz or 5 MHz.
Noise Figure
5 dB maximum.
RF Port Impedance
50 ohms nominal.
Maximum Input Signal Without damage
+10 dBm with no attenuation.
CDMA Power Output
8 Watts Downlink, 1Watt Uplink.
Spurious Emissions per J-STD-008
(Measured from filter center frequency).
-45 dBc min @ 885 KHz.
-13 dBm max @ 1.25 MHz.
-45 dBm min @ 1.25 MHz.
In-Band Spurious
-30 dBm or better at maximum gain.
Status
Frequency setting, gain setting, and module failure via
phone interface.
Power Gain
Downlink
Uplink
65 to 95 dB, adjustable in 2 dB steps.
55 to 85 dB, adjustable in 2 dB steps.
