Powerwave Technologies 5JS0054 User Manual

Draft RX 1850-1910 MHz; TX 1930-1945 MHz

System Integration Manual

Radio Frequency Front End

Multi-Carrier Power Amplifier System

044-05082 Rev. A March 2001

Draft RF Front End System Integraton Manual

®

© 2001 Powerwave Technologies Incorporated. All rights reserved.
Powerwave Technologies, and the Powerwave logo are registered trademarks
Powerwave Technologies, Inc. reserves the right to make changes to the documentation and

equipment, including but not limited to component substitution and circuitry changes. Changes
that impact this manual may subsequently be incorporated in a later revision of this manual.

March 2001

Powerwave Technologies, Inc. Tel: [phone]
1801 E. St Andrew Place Fax: [phone]
Santa Ana, CA 92705 Web Site: www.powerwave.com

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Section 1 General Discription

1-1 Introduction

This manual contains information and procedures for installation, operation, and maintenance of
the Radio Frequency Front End (RFFE) Multi-Carrier Power Amplifier (MCPA) System. This
manual is organized into sections as follows:

Section 1.General Description Appendix B: Amplifier Power Setting Procedure
Section 2. Installation Appendix C: General Site Survey Form
Section 3. Operating Instructions
Section 4. Principles of Operation
Section 5. Maintenance
Section 6. Troubleshooting

1-2 General Discription

Designed to compensate for cable loss due to long cable runs, the RFFE uses an AB amplifier
that utilizes a pre-distortion technique for linearization (see figure 4-3 for the amplifier block dia­gram). Designed as a two unit system and equipped with a space diversity path to reduce fading,
the RFFE operates in the PCS frequency range of: 1850MHz to 1910MHz (receive) and 1930MHz
to 1945MHz (transmit): The system consists of.

• The Masthead Unit (MHU)

• The Masthead Unit Interface (MHUI)

1-2.1 The Masthead Unit

The primary function of the MHU is to provide maximum RF output power (not to exceed 100
Watts) with multiple CDMA carries into a matched 50 Ohm load while maintaining the spectral re­growth and spurious requirements (see table 1-2). Supported by a mounting frame (see figure
1-2), the Mast Head Unit (MHU) is mounted on the antenna tower near the antenna and consists
of three modular components; the common box and two RF transmit (Tx) modules. each module
is encased in a weatherproof (NEMA 4) housing (refer to table 1-2 for environmental specifica­tions).

1-2.1.1 The Common Box

The common box (see figure 1-4) connects to both Tx modules via blind mate connectors (refer to
figure 1-1 and table 1-1). It houses a redundant LNA path, two input duplexers, two output du­plexers, two 27VDC (scalable up to 1200Watts) power supplies, and a control board.

1-2.1.2 The Transmitt Modules

Powered by 220VAC from the host breaker panel, the two RF transmit modules are used for re­dundancy in the system. Each module houses one MPA9505-55 MCPA and a rectifier circuit that
reduces the 220VAC to the 27VDC required to operated the amplifier. To aid in maintaining the
system’s operating temperature, each amplifier is mounted on a heat sink and is equipped with a
220VAC variable speed fan. Refer to figure 1-5.

The MHU connects to the Masthead Unit Interface (MHUI) by two RF cables, and one CONTROL
cable. Refer to figure 2-6.

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1-2.1.3 Masthead Unit Interface

The Masthead Unit Interface (MHUI) interfaces the MHU to the host base station. It provides a
user friendly control panel for power level adjustment and display. The control panel is key
activated and displays major, critical and minor alarm conditions via LED displays. Refer to sec­tion 2 for a more detailed description of the MHUI controls.

The enclosure houses a low power duplexer, a control board, the control panel, cell size variable
attenuators (both Rx and Tx) and a preamp. The system reports and displays alarm faults to the
external summary module via an RS-485 bus or form C dry contact relays. Refer to figure 4-4 for
the MHUI functional block diagram.

The MHU-MHUI pair operates between 1dB and 16dB of cable loss in the transmit/receive coaxial
cable. Therefore, the maximum distance between the MHU and MUI depends on the cable type
used (e.g. 7/8”, 1/2” or 1/4” foam-dielectric coaxial cable).

1

7

6

12 12

AB

1

1

2

3

4

7

6

C

Note: The Connector Identification (A,B and C) is for reference only

and not necessarily labled on the actual connector

Figure 1-1 Masthead Unit Blind mate Connector Interface

Table 1-1 Blindmate Connector Pin Designation

Pin Function

1A +26 VDC
2A +12 VDC
3A -8 VDC
4A COM

5A-12A Not used

1B Not used
2B TX IN
3B TX OUT
4B Not used
1C Mute

2C-4C Not used

5C RS-485H
6C RS-485L
7C COM

8C-12C Not used

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Table 1-2 System Specifications with the MPA9505-55 MCPA

Frequency:
Receive
Transmit

RF Input Power 3dBm (2 milliWatts)
RF Output Power: 55 Watts (47.40 dBm) Max./ 7carriers

1850-1910 MHz
1930-1945 Mhz

Nominal Gain
Typical Gain Flatness

40 dB ±1.0 dB

±0.2 dB (over any 2.0 MHz in band)
Gain Variation Over Temperature 1.0 dB @ -20 to 80 ºC Base Plate
IMD Spurious Emissions @ 7 carriers

(Room Temperature):
Frequency Off-Set ± 885 KHz
Frequency Off-Set ± 1.25 MHz
Frequency Off-Set ± 2.25 MHz

-47 dBc max (30 KHz BW)

-13 dBm max (12.5 KHz BW)

-40 dBc (marker to marker)

IMD Spurious of MCPA in MHU @ An­tenna Port:
885 KHz, 30 KHz BW

1.98 MHz, 30 KHz BW

2.25 MHz, 1 MHz BW

-47 dBc

-57 dBc

-15 dBm

Spectrum Regrowth of MCPA in MHU @
Antenna Port:
885 KHz
1250 MHz
2250 KHz

-47 dBc

-13 dBm

-13 dBm
Tx Noise in Rx Band @ MCPA Output: -122 dBm/Hz (max.)
Tx Power in Rx Band @ MHUI Rx Output -110 dBm @ Rated Output Power
Input/Output VSWR 1.3 : 1
Output Protection Mismatch Protected
DC Power

27 VDC ± 1.0 VDC @ 24 Amps max.
Sample Port -40 dB ±1.0 dB
Operating Temperature
Storage Temperature

-20 °C to 85 °C Base Plate

-40 ºC to 85 °C Base Plate
Operating Humidity 0-95% (Non Condensed)
Operating Vibration 1.0 GHz from 10 Hz to 150 Hz
Wind Load 125 mph (min.)
NEMA Rating 4
Remote Alarm Reporting RS-485, Form-C
Receive Band Noise @ MCPA Output -122 dB
Tx-Rx Rejection >75 dB
Dimensions 10(H)x24(W)x48(D) inches
Weight (Fully assembled) 29 lbs (13kg)

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Mounting
Frame

Transmit
Module
(typ. 2 plcs.)

Common
Box

Figure 1-2 The Mast Head Unit with Two Transmit Modules

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Figure 1-3 Masthead Unit Assembly

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Figure 1-4 The Common Box

Figure 1-5

Figure 1-6 The Common Box Assembly

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Blind-mate
Connector

Figure 1-7 The Transmit Module Assembly

Breather
Vent.
(Typ. 2 Plcs)

220 VAC
Connector
(Typ. 2 Plcs)

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Figure 1-8 Masthead Unit Interface Front and Rear Views.

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