User's Manual

Part Number: J24004

Drawing Control: JD16049

GENERAL SPECIFICATIONS

Specifications may change without notice. All specifications stated as typical unless otherwise noted.

Down Link (Base to Mobile) Up Link (Mobile to Base)

Frequency 1930 to 1990 MHz 1850 to 1910 MHz

Typical Pass Band at 3 dB down

Typical Pass Band at 30 dB down ( +22 dB Gain)

Gain at Min Attenuation -Typ. 65 dB 65 dB

Gain Range, Manual Attenuator 15 dB 15 dB

Pass Band Ripple - Typ.

Noise Figure - Typ. 6.5 dB 6.5 dB

Output Power Set Point CDMA +23 dBm +23 dBm

Power Control Range +20 dB +20 dB

3rd Order Intercept Point, IP3 +44 dBm +44 dBm

Recommended Input Power Maximum, Composite -35 to -80 dBm -35 to -80 dBm

Maximum Input Power No Damage 0 dBm 0 dBm

Impedance - Nom 50 Ohms

VSWR, Input, Both Ports 2.0:1

Propagation Delay < 5.0 microsecond

Power 120 VAC @ 750 mA

Operating Temperature -30 to +50

Connectors, RF N Female

Diagnostics Interface RS-232

Programming DIP Switches & RS-232

Size (WxHxD), in. (mm) 14.7 x 12.8 x 4.6 (374 x 325 x 117)

Weight 19 lbs

OVERALL THEORY OF OPERATION

The 48660 is a single channel CDMA PCS Bi Directional Amplifier. It is comprised of two main components; Up

Link and Down Link. With each component made up of 3 sections, Input Section, IF Section, and Output Section.

Refer to Figure X.1. Since the Up Link and Down Link components are virtually identical, only the theory of

operation for the Down Link will be presented.

DOWN LINK

Signals originating from the PCS base station are received at the antenna and fed to the input of the 48660. They are

then filtered through the first duplexer to attenuate any non-PCS signals which may be received at the antenna. The

signal(s) is then fed to the input stage for amplification and additional filtering. If the signal as detected in the output

stage is too large, it will receive attenuation in the input section as well. At this point the signal is then fed into the

IF section for down conversion, filtering through the SAW devices, additional amplification, and finally up

conversion back to it’s original frequency. By using the same Local Oscillator for the down and up conversions,

frequency accuracy is maintained. The newly up converted signal is then an exact replica of the original signal only

very highly filtered to get rid of any other signals near it. This signal is fed into the output section where additional

amplification takes place as well as Local Oscillator filtering. Special care has been taken in the design of the 48660

Intelli BDA to maintain good spectral purity of the CDMA signal. It meets or exceeds the spectral regrowth criteria

of ANSI J-STD-008 at it’s rated output power.