Japan Radio JHU-1961 Multichannel amplifier User Manual 8
Japan Radio Co Ltd. Multichannel amplifier 8
8
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| Document ID | 21176 |
| Application ID | fxhhI1QNbo5aacFPfM9CJg== |
| Document Description | 8 |
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| Document Type | User Manual |
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| Date Submitted | 1999-01-27 00:00:00 |
| Date Available | 1999-03-15 00:00:00 |
| Creation Date | 2001-07-07 23:37:12 |
| Producing Software | Acrobat Distiller 4.0 for Windows |
| Document Lastmod | 2001-07-07 23:37:13 |
| Document Title | 8 |
FCC ID: CKEJHU—lQSl
APPENDIX 5
INSTRUCTION MANUAL
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TWENTY (26) PAGE INSTRUCTION MANUAL 1;
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INSTRUCTION MANUAL
FCC ID: CKEJHU-1961
APPENDIX 5
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FCC ID: CKE JHU-1961
Instruction Manual
Multi-Carrier Power Amplifier System
JHU-1961
17051900
REV? 1998.11
Table of Contents
Section 1 General Introduction
1.1 Introduction
1.2 Description
1.3 Model Information
1.4 Specification
Section 2 Installation
2.1 Introduction
2.2 Unpacking and Inspection
2.3 Installation Instruction
2.4 DC PowerCable Wiring
2.5 Ground Wire Installation
2.6 RF Coaxial Cable Installation
2.7 Alarms, Status, and Controls description
2.8 Outline Drawings
2.9 Schematic Diagrams
Section 3 Operating Instructions
3.1 Introduction
3.2 Location of the system interface connectors and other
connectors
3.3 Operation Procedures
3.4 Power Splitter/Combiner
3.5 VSWR of the Conventional Power Combiner
Section 4 Principles of Operation
4.1 Introduction
4.2 JHU-1961 MCPA System
4.3 NAH-1961 MCPA Module
4.4 NCE-7028 Supervisory Control Card
Section 5 Maintenance
5.1 Introduction
5.2 Periodic Maintenance
5.3 Field Replaceable Parts and Modules
5.4 Power Output Monitoring
5.5 Measurement of spurious and IMD
Section 1
General Introduction
1.1 Introduction
This manual covers information and procedures for installation, operation, and
maintenance of the JHU-1961 series Multi-Carrier Power Amplifier (MCPA)
system.
1.2 Description
The JHU-1961 MCPA system consists of one to four MCPA modules,
a supervisory control card (SC Card) and the sub-rack. The MCPA module is an
ultra linear power amplifier constructed with the SAFF (Self Adjusting Feed-
FonNard) intermodulation distortion compensation circuitry. Each amplifier
operates in any 20 MHz frequency band from 1930 MHz to 1990 MHz, and can
produce 40 watts of power output with better than - 63 dBc inter—modulation
distortion(IMD). Such ultra-linearity makes the MCPA system able to operate
under multi-carrier environment of digital modulation signals. This superior
characteristics is appropriate for all access methods such as GSM,TDMA and
CDMA The MCPA system can provide 32 watts, 64 watts, 96 watts and 128
watts of RF power output at the output terminal of the rack according to the
number of the MCPA modules. The higher power is obtained by combining
plural MCPA modules. Primary power supply for the MCPA system is +21Vdc to
+30Vdc, and converted to the appropriate DC voltage in each module. The
distributed primary power can be turned on/ofi‘ with a circuit breaker installed on
the front panel of each module.
1.3 Model Information
(1) PCS MCPA Rack
‘_ AirNet Definition JRC Part Number Output Power
/Sector
1x1 Rack Switchable Splitter/Combiner JHU-1961A1 32/64/96/128
1x1 Rack 2 way Conventional ‘ JHU-1961A12 32/64
Splitter/Combiner with Through
Line
1x1 Rack 3 way Conventional JHU~1961A13 32/96
Splitter/Combiner with Through
Line
1x1 Rack 4 way Conventional JHU»1961A14 T32/128
Splitter/Combiner with Through
Line
2x2 Rack Switchable JHU-1961A2 32/64
Splitter/Combiner
4x4 Rack JHU—1 961 A4 32
(2) PCS MCPA Module
Definition JRC Part Number
PCS 40W Multi—Carrier—Amplifier for A, D NAH-1961AD
218?th Multi-Carrier—Amplifier for B, E NAH-1 981 BE
3:2;ka Multi-Carrier—Amplifier for C, F NAH—1961CF
EFSEOW Multi—Carrier—Amplifier for E NAH-1961 E
be
NotezNAH-1961 series of the PCS 40W MCPA modules covers 20MHz of
operating bandwidth. Make sure the operating frequency or Block with Name
Plate before the modules are used. The sticker, which indicates the operating
block, is attached beside the D-Sub connector on the back of the module.
The front panel does not show the operating frequency block.
(3)PCS MCPA Supervision and Control
Definition i JRC Part Number
Supervisory and Control card for JHU-1961 NOE-7028
series of PCS MCPA Syitem
There is only one PCS MCPA Supervision and Control Card (SC Card) is
installed in a rack. The SC cards are interchangeable. The card must be always
installed in the rack or must not be pulled out during the operation, otherwise,
the appropriate operation will not be guaranteed.
(4) PCS MCPA Systematic diagrams
The systematic diagrams of JHU-1961 series PCS MCPA systems are shown
below.
Figure 1-1:JHU-1961A1
Figure 1-2:JHU-1 961 A2
Figure 1—3:JHU-1 961 A4
Figure 1-4:JHU—1961A12
Figure 1-5:JHU-1961A13
Figure 1—6:JHU—1961A14
1.4 Specification
The specifications for the MCPA system JHU-1961 are shown in Table 1-1.
MCPA
NAH~1961
Input A
Switch
Splitter
—- PA2 Switch
Combiner
Directmnal Output A
Coupler
—30 dB
Fig 1-1 JHU-1961A1 1X1 Rack Switchable Splitter/Combiner
Input A
©—
Input B
Switch
Splitter
Switch
Splitter
MCPA
NAH-1961
Combiner _ O.
Directional Output A
Coupler
-30 dB
Switch ‘W
Combiner ‘@
Directional output B
Coupler
'—— -30 dB
Fig 1-2 JHU—1961A2 2 ><2 Rack Switchable Splitter/Combiner
MCPA
NAH»1961
InputA (E) PA1> (E) OutpulA
lnputB @_ PAz OutputB
“PM @— PA3 OutpulC
input D
PA4 Output D
Fig 1-3 JHU-1961A4 4X4 Rack
Through Line
Through Line
[VV
lnput A , ' Directional
Coupler
-30 dB
Output A
Fig 1-4 JHU-1961 A12 1x1 Rack
2 way Conventional Splitter/Combiner with Through Line
Note: When PA2 is not installed, 2 way splitter & combiner are bypassed with the through line.
MCPA
NAH—1961
Through Line ------------ Through Line
3 Way
Input A Splitter Directlonal
: Combiner Output A
Coupler
-’ -30dB
Fig 1-5 JHU—1961 A13 1x1 Rack
Sway Conventional Splitter/Combiner with Through Line
Note: When PA2 and PA3 are not installed, 3 way splitter & combiner are bypassed with the through line.
Directional
. Output A
Combiner Coupler
-30 dB
Fig 1-6 JHU~1961 A14 1X1 Rack
4way Conventional Splitter/Combiner with Through Line
Note: When PA2, PAS and PA4 are not installed, 4 way splitter & combiner are bypassed with the through line
Table 1-1 Specifications for the MCPA system JHU-1961
Transmitting Frequency Range
within PCS band
1930MHz-I950MHz(NAI-I—1961AD used)
l950MHz»197OI\fl-Iz(NAH-1961BE used)
1970MI-Iz-1990hfl-Iz(NAH-I961CF used)
i965MHz-197om-iz AH-1961E used
RFGain
Total Output Power
48.563 +/-1.0d.B (lxl rack)
48.5dB +/-1.0dB (2x2 rack)
48.5dB +/—0.5dB 4x4 rack
128Watts(4 modules combined)
96Watts(3 modules combined)
64Warts(2 modules combined)
Passband Gsn'n Flatness
32Watts!1 module)
Better than i’O.5dB across any 200kHz
bandwidth within the TX band
Passband Phase Linearity
Gain Variation over Temperature
Better than i 1 degree across any 200kHz
bandwidth within the TX band
Better than i1.0dB
Intermodulation Distortion
Spurious
Better than -63dBc
2" harmonics Less than +10dBm
3“ and greater harmonics Less than -20dBm
Input / Output Port Return Loss
SFDR: Less than —36dBm
Better than —15d.B
Output Protection
Mismatch Protected
Monitor Coupling Level
-30dB 1 MB
DC Power Source
+21VDC to +30VDC
RF/DC Efficiency
J Better than 4%
System Alarm
RS422 Serial Interface
Operating Temperature Range l 0°C to +40°C (short term 0°C to +50°C)
Storage Temperature Range
40°C to “55°C
Operating Humidity Range
10% to 80%
DC Power Input Connector
Serial Interface Connector
Terminal Block
Female 9-pin D-sub connector
RF Input Connector
SMA—type female
RF Output Connector
N—type female
Monitor Fort Connector
SMA~type female
Dimensions
19”W I7.47”H 21 ,46"D
Section 2
Installation
CAUTION
1. “THIS EQUIPMENT IS DESIGNED FOR +21 to +30 Vdc POWER
SUPPLY. THIS EQUIPMENT MUST BE CONNECTED ONLY POWER
SUPPLY THAT COMPLY WITH THE REQUIREMENTS OF UL478,
UL1012,UL1310, UL1270, UL1409, UL1410, UL813, UL1459, UL1419 OR
UL1950. THIS POWER SUPPLY CABLE SHOULD BE PREPARED BY
SYSTEM OPERATOR. THIS EQUIPMENT SHOULD BE INSTALLED IN
ACCORDANCE WITH THE NATIONAL ELECTRIC CODE, ANSIINFPA
70."
2. FOR INSTALLATION OF THE SUB-RACK, PREPARE A CABINET THAT
IS COMPLETELY ENCLOSED WITH DURABLE WALL AND CAN
WITHSTAND MORE THAN 80KG OF ITS WEIGHT.
3. TO AVOID TIPOVER OF CABINET, BE CAREFUL THE SUB-RACK
ATTACHING POSITION IN THE CABINET.
4. TO AVOID HEATING TO THE SUB-RACK, DO NOT ATTACH ANY
EQUIPMENT THAT MAY DISSIPATE PLENTY OF HEAT UNDER THE
SUB-RACK.
2.1 Introduction
This section contains unpacking, inspection, installation instruction, power
source, and Alarm interface for the JHU»1961 MCPA system. Prior to starting
the equipment unpacking or installation, carefully read all sub-section item by
item.
2.2 Unpacking and Inspection
As described in the previous section, the MCPA system consists of MCPA
Module(s), an SC Card and a sub-rack. The SC Card is already installed in the
sub rack, and packed in a wooden container along with MCPA module attaching
screws packed in a plastic bag While the MCPA module is packed in individual
carton container, which is especially designed for anti-damage and easy
packing. To remove the MCPA module from the carton container, carefully open
the lid of the carton and carefully remove the shock absorber. If possible, retain
its carton that can be reassembled in case the module must be returned to the
manufacturer.
After unpacking, visually check if the MCPA module is not damaged while
transportation, especially the D-sub connector and its guide pins attached on
the rear of the MCPA module are delicate. And confirm that the several sets of
screw, washer and spring washer are in the plastic bag, which is attached on the
top of sub rack.
2.3 Installation Instruction
WARNING
1. Do not remove any covers attached to the MCPA module.
lf removed, its performance would not be guaranteed.
2. Carefully install the MCPA module into the slot of MCPA sub-rack.
D-sub connector attached on the back of the MCPA module, which
connects with the rack, contains two push-on type RF connectors.
These ones are delicate.
As shown in the Figure 2-1, the MCPA sub-rack has four slots for the MCPA
modules. The first slot from the left corresponds to the MCPA module PA1,
and the second one corresponds to the MCPA module PA2, and the third one
to PAS the fourth one to PA4. If four MCPAs are not installed the empty slots
are covered with blank panels.
Module Module Module Module
PA 1 PAZ PAS PA4
Installed in the sub-rack.
Other portions are covered by
Figure 2-1. MCPA sub-rack blank panels,
SC Card is already
To install the MCPA system, proceed as follows;
2-3-1. Install sub-rack in the Lower Cabinet, and secure in place with eight
screws.
2-3—2. Refer to Figure 2-2, 2—3 and 24 for the location of all input/output
connectors.
2-3-3. Refer to Figure 2-6, 2-7, 2-8. 2-9, 2—10 and 2—11 schematic diagram for
the pin assignment.
2-3—4. Connect the antenna cable to the OUTPUT connector on the rear of the
sub—rack.
2—3~5. Connect transceiver or exciter output to the INPUT connector on the rear
of the sub-rack.
2-3—6. Connect proper DC voltage Iine(+ 21 Vdc to +30Vdc) and Ground to
appropriate terminals on the sub—rack.
2»3-7. Carefully unpack each MCPA module from the carton.
2-3-8. Confirm that D-sub connector mounted on the rear of MCPA module is not
accumulated with any dust.
23—9. Carefully install the MCPA module in the sub-rack, and secure in place
with four screws (" To install the MCPA module in the sub-rack quickly, firstly
fit the lower edge to its corresponding slide attached in the sub-rack.
And then, fit the upper edge.)
2-3—10. Before applying DC voltage to the sub-rack, check the connections
around the D—sub connector if they are tight and correct.
2-3-11. Confirm that DC voltage is within +21 Vdc to +30 Vdc.
2.4 DC Power Cable Wiring
To generate nominal RF output power, this MCPA system consumes
approximately 123 amperes maximum at +26Vdc when the nominal output
power is generated. Therefore, to wire DC power cable with the MCPA system,
use appropriate thick AWG # wire within safe current.
Since the DC power terminal provided on the rear of the MCPA system sub—rack
is made from M6 mm screw, use a lug for M6 mm diameter screw or equivalent
to attach the DC power cable to it. ( see below)
Lug for M3 mm screw
2.5 Ground Wire Installation
Confirm a ground—wire attaching nut and a lock washer are mounted on the
ground stud, which are located on the rear panel of the MCPA system sub—rack.
Since this ground stud is made from M6 mm thread, provide a lug for M6 mm
diameter screw or equivalent to attach the ground—wire to it securely. See below.
@—————i M6 mm Lock nut and washer
for Grounding
Lug for M6 mm screw
Ground Wire (Green)
AWG#:10
2.6 RF Coaxial Cable Installation
Refer to Figure 3-1 for the RF connectors location.
2.6.1 input RF Cable Connection
Use appropriate RF cables for high frequency impedance matching .
Warning
Do not excessively screw the male SMA connector. Use the
appropriate torque wrench. Excessive screwing results in
breakage of the connector.
Recommended torgue: Bkgf-cm
For RF input of the MCPA system, a female SMA connector is provided on the
rear of the sub-rack. Prior to the connection of the input signal cable, check if the
female SMA connector is not damaged. Then screw the male SMA with input
cable firmly into the female SMA connector of the MCPA system using the
appropriate torque wrench.
2.6.2 Output RF Cable Connection
For the RF output of the MCPA system, a female Type»N connector is provided
on the rear of the sub-rack. Prior to the connection of the output signal cable,
check if the female Type-N connector is not damaged. Then screw the male
Type-N connector with antenna cable firmly into the female Type—N RF output
connector of the MCPA system.
2.7 Alarms, Status, and Controls description
The status and alarm signals are provided via RS-422 serial interface and/or
LED indicators. AII amplifier modules in the sub—rack are monitored and
controlled through a single RS-422 serial interface. JHU-i 961 has up to four 9-
pin D—sub miniature female type connector. These are used to monitor the
individual MCPA module’s operating condition and to activate the remote reset.
The control circuitry has a watch-dog timer as an fail-safe mechanism to insure
that failures of this circuitry are automatically cleared. The alarms, status, and
control information are listed below.
2.7.1 Alarms and Status description
ALARM (LED) DESCRIPTION
ACT ACT LED (Green) indicates when the RF output control is
enabled and that the proper DC power level is applied. This
status is sent through RS-422 as enable/disable of RF
output.
FF FF LED (Red) indicates when the MCPA module's feed-
Forward correction system is failed. This alarm is sent
through RS~422 too.
HPA HPA LED (Red) indicates when the MCPA module’s main
amplifier is failed, This alarm is sent through RS-422 too.
OVER OVER LED (Red) indicates that the transmit power of the
MCPA module is in excess of the rated power. And the
MCPA results in shutdown condition simultaneoUsly with
the alarm occurrence. This alarm is sent through R3422
too. The resumption of the operation is performed by
manual RESET button or remote RESET activation.
TEMP TEMP LED (Red) indicates when the heat sink temperature
of the MCPA module exceeds 80°C. Just then the MCPA
results in shutdown condition simultaneously with the alarm
occurrence This alarm is sent through RS-422 too. The
resumption of the operation is performed by manual
RESET button or remote RESET activation.
FAN FAN LED (Red) indicates when an air flow failure in the
MCPA module is occurred. This alarm is also sent through
RS422.
VSWR VSWR Alarm and Shutdown
The VSWR LED (Red) turns on if the VSWR at the
amplifiers output terminals exceeds approximately 55:1.
The amplifier module results in shutdown condition
simultaneously with the alarm occurrence This alarm is
also sent through RS-422. The resumption of the operation
is performed by manual reset button or remote reset
activation.
Even if the VSWR comes back to the normal value,
amplifiers maintain the shut—down state as long as two
reset actions by software command and power—on will not
be executed. When the reset action is required, antenna
and RF cable’s condition should be checked again by all
means.
2.7.2 Controls description
CONTROL DESCRIPTION
RESET RESET button is provided for the case, when the control
operation and the alarm circuits are desired to be reset. A
remote RESET is also implemented via RS-422 .
And a remote reset terminal is provided in the 9—pin D—sub
connector for RS-422 on the rack. See schematic diagram.
RF Output Control This function enables or disables RF output of the MCPA
module. Each MCPA module has its own control switch.
This control is implemented via RS-422 and with the
locking toggle switch on the rear of the sub—rack.
O.V.P. Each MCPA module has over-voltage protection (O,V.P.)
with shutdown before damage to the MCPA occurs. This
condition is neither indicated nor sent through RS-422.
However, the MCPA system automatically resume normal
operation upon removal of the over-voltage condition
without any control.
2.7.3 Serial Interface description
RS-422 DESCRIPTION
An RS—422 serial interface is implemented in this MCPA system. When this
MCPA system is initially turned on or it encounters an interruption in power, the
RS—422 RF output control comes up in the “output disabled" state.
The serial communication network utilizes a single differential signal pair
conforming to the R342 standard. The serial interface provides separate
signal path for receiving and transmitting data. The connectors for the serial
interface are standard DE-9 subminiature 9 pin female connectors with screw
locks (#4—4D). Signal pin assignments for serial interface in the MCPA system
are shown in Table 2-1.
Table 2-1 Serial Interface Pin Assignments
Signal Description
TX+ RS-422 Positive Output
RS-422 Negative Output
RX+ RS~422 Positive Input
RS-422 Negative Input
NC No Connection
NC No Connection
NC No Connection
Reset Serial Interface Reset (Low Active)
GND Cable Shield
wooxlmmwa—lg
2.8 Outline Drawings
(1) Fig. 2-2: NQZ-8625A1/ Outline Drawing for 1x1 Rack
(2) Fig. 2-3: NQZ—8625A2/ Outline Drawing for 2x2 Rack
(3) Fig. 2—4: NQZ-8625A4/ Outline Drawing for 4x4 Rack
(4) Fig. 2-5: NAH-1961/ 40W PCS MCPA Module
2.9 Schematic Diagrams
(1) Fig. 2-6: A1/1x1 Rack Switchable Splitter/combiner
(2) Fig. 2—7: A1 2/1x1 Rack 2 way Conventional Splitter/Combiner with Through Line
(3) Fig. 2-8: A13/1x1 Rack 3 way Conventional Splitter/Combiner with Through Line
(4) Fig. 2-9: A14/1x1 Rack 4 way Conventional Splitter/Combiner with Through Line
(5) Fig. 2-10: A2/2x2 Rack Switchable Splitter/Combiner
(6) Fig. 2-11: A4/4x4 Rack
Section 3
Operating Instructions
3.1 Introduction
This section contains operating instructions for the MCPA system JHU-1961t
3.2 Location of the system interface connectors and
other connectors.
The MCPA system is designed for 19 inch rack mount. Almost all connectors of
the MCPA system are mounted on the rear of the system rack, and are shown in
Item 2.8 and are described in detail in Item 2.9.
3.3 Operation Procedures
WARNING
Before applying power, make sure that the input and output of
the amplifier are properly terminated at 50 ohms. Do not operate
the amplifier without a load attached. Excessive input power
may damage the amplifier. “ Warm-Up Period " is required
before RF input signal is applied to the JHU-1961 Series of
MCPA system.
1. Double check to ensure that all input and output cables are properly
connected.
2 Confirm that all front panel switches are in the OFF position, and RF input is
not applied.
3. Turn on power supply that provides proper DC voltage (+21Vdc to +30Vdc).
4. Confirm that the “Power’ LED in the SC Card is lit.
5. Turn on each MCPA module power switch. And confirm that the “ACT”
indicator is turned on.
6. "Warm—Up Period” is required before RF input signal is applied to the JHU—
1961 Series of MCPA system. If the RF input signal is applied right after the
power switch is turned on, the system could be damaged.
7. Slowly increase the RF input from lower level to appropriate input level
that provides rated power output.
8. Do not exceed nominal output power at the OUTPUT terminal on the rack.
3.4 Power Splitter/Combiner
The JHU-1961 series of PCS MCPA system has six types of rack configuration
as described in Item 1.3.
JHU-1961 A1 and A2 include Switchable Splitter and Combiner.
JHU-1961 A4 does not include Splitter and Combiner.
JHU-1961 A12, A13 and A14 have particular number of the MCPAs and all
splitters and combines are designed so that each loss is optimized
And through lines are installed in the three types of the rack to bypass the
Splitter and combiner to use one unit of the MCPA.
The three types of the rack are assembled to use splitter and combiner when the
racks are shipped. If only one module is installed in these three types of the
rack, the splitter and combiner must be bypassed The procedure is described
below:
How to Bypass the Splitter and Combiner
The Racks are going to be shipped with particular configurations, such as two,
three and four compositions. When the splitter and combiner are bypassed, the
related co-axial cables are disconnected and reconnected as explained below.
All drawings are the bottom views.
(1) Two Composition Type
The Rack is shipped in the composition of two amplifiers as shown in Fig. 3-1
and Fig. 3-2.
Disconnect one end of the two cables marked 1 and 2.
Connect the cable marked 1 to the connector marked 3.
Connect the cable marked 2 to the connector marked 4.
Disconnect one end of the two cables marked 5 and 6.
Disconnect the N-type connector marked 7.
Slide the combiner marked 8 and connect the connector marked 10 to the
male connector which was connected to the combiner 8.
Connect the marked 5 cable to the connector marked 9.
The open end of the cable marked 6 can remain opened as it is.
fleeces
F”?
(2) Three Composition Type
The Rack is shipped in the composition of three amplifiers as shown in Fig. 3-3
and Fig. 34.
Disconnect one end of the two cables marked 1 and 2.
Connect the cable marked 1 to the connector marked 3.
Connect the cable marked 2 to the connector marked 4.
Disconnect one end of the three cables marked 5, 6 and 7.
(The cable marked 6 is invisible in the drawing.)
pops»
f.
g.
h.
Disconnect the N-type connector marked 8.
Slide the combiner marked 11 and connect the connector marked 9 to the
male connector which was connected to the combiner 11.
Connect the cable marked 7 to the connector marked 10.
The open end of the cables marked 5 and 6 can remain opened as they are.
(3) Four Composition Type
The Rack is shipped in the composition of four amplifiers as shown in Fig. 3-5
and Fig. 3-6.
90m»
:“(D
Disconnect one end of the two cables marked 1 and 2.
Connect the cable marked 1 to the connector marked 3.
Connect the cable marked 2 to the connector marked 4.
Disconnect one end of the four cables marked 5, 6, 7 and 8.
(The cable marked 6 and 8 are invisible in the drawing.)
Disconnect the N-type connector marked 9.
Slide the combiner marked 12 and connect the connector marked 10 to the
male connector which was connected to the combiner 12.
Connect the cable marked 7 to the connector marked 11.
The open end of the cable marked 5, 6, and 7 can remain opened as they
are.
3.5 VSWR of the Conventional Power Combiner
The conventional combiners are installed in the JHU-1961 series of the
amplifier such as JHU-1961A12, JHU-1961A13 and JHU—1961A14.
When all MCPAs are normally operating in these racks, of-course, there is no
problem. But, more than one modules are installed in the rack and the module(s)
are not powered, or, if the module(s) are left in the rack while the alarm signal,
which executes “shut-down" while the system is in operation, has been kept
sent, the other module(s), which is (are) in the normal operation, will send
"VSWR Alarm".
The reason is because,
If a module, the so-called "disable module” which is not in operation, is installed
in the rack, the line impedance which is looked by the module, the so-called
"enable module” which is in operation, looks like causing VSWR degradation
because of a miss—matching in the combiner.
To avoid the above mentioned phenomena, the following things are required:
1. When only one module is operated in this type of the rack, the splitter and the
combiner should be bypassed.
2. When more than one modules are combined and operated in this type of the
rack, if the alarms (TEMP, OVER, VSWR), which cause “shut-down” come up
in more than one modules, the particular module must be pulled out.
3. Do not put the module, which power switch is not turn on, into the rack.
Section 4 ’
Principles of Operation
4.1 Introduction
This section provides functional descriptions of the JHU-1961 MCPA system.
4.2 JHU-1961 MCPA System
The MCPA system consists of a 19 inch sub—rack and one to four NAH-1961
plug—in MCPA modules. As shown in Figure 4—1, in the 1x1 sub-rack, four slots
for the MCPA modules, the 4-way power splitter/combiner and associated
components are provided. The so-called switchable splitter/combiner is
installed in some model. This MCPA system is designed for parallel operation
to achieve higher peak power output, and for good enough redundancy. The
input signal is divided into equal power using a power splitter to input to each
plug-in MCPA module. Having ultra linearity, each amplifier works within same
power gain and same electrical phase. 50 the combined rated output power can
be simply obtained by using power combiner. _
A directional coupler is mounted behind the power combiner to monitor the
Output signal. Each MCPA module has a serial interface (RS—485) separately to
control the amplifier and to supervise a number of alarm signals with SC Card.
The SC Card communicates with BTS through RS—422 interface.
The serial interface connector (D-sub female connector) is provided on the rear
of the sub—rack.
POWER SPLITTER POWER COMBINER
NAH 1961
O . MCPA MODULE 1 .
Q NAH-1961
MCPA MODULE 2
-30 dB
COUPLER
—
=-l=§ RF OUTPUT
0 NAH-1961 -- momma
. MCPA MODULE 3 illll
Q NAH-1961
MCPA MODULE 4 -
+21Vdc~ “L 0—
+30th: — O—I‘
°1
RF INPUT .
SC Card
Figure 4-1. Block Diagram for JHU-1961MCPA System (1x1 Rack/128W type)
4.3 NAH-1961 MCPA Module
4.4 NOE-7028 Supervisory Control Card
(1) installation
a. No power switch is equipped in the SC card. As soon as the power is
supplied to the rack, the SC card is in operation.
Two types of Fuse, which are for 1A and 32A, are used in the card.
Make sure that two types are in the right place.
b. Before the power is applied to the rack, make sure that;
two types of the fuse are installed in the SC card
the SC card is installed in the rack
the SC card is surely fixed by the screws
c. The green IamplPower] on the SC card indicates that suitable power is
supplied to the rack.
d. The DC power supply which outputs 21V to 30V should be used.
(2) Operation
a. The SC card transfers the control signals from BTS to the individual MCPA
modules. Also, the card supervises how each MCPA module is working
and report to the BTS.
b. The communication protocol between the card and modules is RS-485.
c. The communication protocol between the card and BTS is RS—422. The
connector for this communication is the so—called D—Sub 9 pins connector
and it is installed on the back panel of the rack. Refer to Table 2—1 for the
connection.
d. Whenever the card is installed or removed, make sure that the power will not
be applied to the rack.
e, If the card is not installed, MCPA will not be operated
Since the card supervises Enable/Disable condition of the modules and
controls switchable combiner, make sure by all means that the card is
installed in the rack and the power must be applied. Otherwise, switchable
splitter/combiner could be damaged.
9. The operation status of the switchable splitter/combiner can be monitored by
four LEDs on the front panel. ‘
The green light indicates that its particular splitter/combiner slot is active
when it is on.
If the green light is off, it indicates that its particular slot is not a part of the
composition.
h. Only when the communication between BTS and the card is not properly
done, push the reset switch on the front panel. The hardware is coming to
the reset condition
i. One discrete TI'L hard reset signal is provided to reset the serial interface.
The reset signal is sent through the D-sub connector same as for RS-422.
See schematic diagram.
j, The MCPA rack provides forward and reverse power detection for each
sector via an 8 bit digital word over the serial interface.
k. While the module is in operation, do not pull out the fuse in the card by all
means.
70.
5.1 Introduction
Section 5
MAINTENANCE
This section describes periodic maintenance, field replaceable equipment,
power output monitoring method, and spurious and IMD measurement
procedures for the JHU-1961, MCPA system.
5.2 Periodic Maintenance
Periodic maintenance requirements are shown in Table 5-1.
CAUTION
Do not touch DC power supply input terminal
and the FAN motors or they may cause serious physical injury.
Table 5-1 Periodic Maintenance
| ITEM INTERVAL ACTION
Air intake slit 30 days Inspect and clean according to the explanation
below.
Cables and 12 months Inspect and confirm if signal and power cables are
Connectors not frayed.
inspection Check RF oonnectors whether they are connected
“all
The air intake and outlet portion should be inspected every 30 days. if any
dust and dirt are accumulated, the cooling efficiency may be decreased. Using
compressed air, remove accumulated dust and dirt from them.
CAUTION
Wear proper eye protection to avoid eye injury
when using compressed air.
5.3 Field Replaceable Parts and Modules
The following parts and modules can be replaced in the field by a qualified
technician,
_J
1. NAH-1961 Mum
Carrier Power Amplifier module
2 Cooling Fans
3. Fuses for SC Card : Type SMP~
10, SMP-32
WARNING
1. Do not touch the blowing fan motors or they may cause serious
physical injury.
2. Do not restrict fan motors revolution or their life time may be
reduced dramatically.
5.4 Power Output Monitoring
The JHU-1961 series of the MCPA system other than Model JHU-1961A4
provide —30dB coupled monitor port of the final MCPA system output. It is used
for measuring output signal waveform, ND, and harmonics.
ln-band and out»band coupled levels are shown in Figure 5-1 and Figure 5—2
respecively.
When monitoring the carrier signal output, the deviation of the coupling level is
within 0.15dB in the assigned PCS band. So the in-band spurious and IMD level
are measured exactly.
WARNING
1. Do not exceed the rated output power of the system. If exceeded,
its performance would not be guaranteed.
2. When measuring the system output power, using the power meter
at the output port of the sub-rack is recommended for the accurate
measuring.
5.5 Measurement of spurious and IMD
When measuring the 2"d and greater order harmonics emitted from the MCPA
system, compensate the discrepancy of the coupled level in accordance with
Figure 5-2. Figure 5-2 shows the coupling level of the monitor coupler over
1OGHz.
When measuring the IMD level emitted from the MCPA system, using the
monitor port of the sub-rack allows accurate IMD measurement. However, for
accurate IMD measurement, the spectrum analyzer having high dynamic range
and low noise floor characteristics are required.
FCC ID: CKEJHU-1961
APPENDIX 6
TRANSMITTER ALIGNMENT
E§££5E3L13n§_un_21255§ure
1. MCPA Module “AH-1961
1-1. After checking all of the biasing voltages and function
of individual circuit modules, the following adjust-
ments shall be made:
1-2. To adjust the first loop (IMD detection loop), connect
a spectrum analyzer to the output REF OUT located in
the module A1.
1-3. Adjust the RV7 and RVB so that the component of input
signal is minimized at the outport (REF OUT).
1-4. To adjust the second loop (IMD suppression loop), apply
rated multi-carrier input signal to the input port of
the MCPA module.
1—5. Connect a spectrum analyzer to the monitor port (MON)
located on the front panel of this HCPA module.
1-6. Adjust RV} and RV4 attached in the module A2 so that
the IND components will be minimized.
TRANSMITTER TUNE-UP PROCEDURE
FCC ID: CKEJHU—l961
APPENDIX 6
FCC ID: CKEJHU-1961
APPENDIX 7
CIRCUITS AND DEVICES TO STABILIZE FREQUENCY
The JHU-1961 “CPA functions as an amplifier only and has no
frequency determining circuitry.
CIRCUITS AND DEVICES T0
STABILIZE FREQUENCY
FCC ID: CKEJHU—1961
APPENDIX 7
FCC ID: CKEJHU-1961
APPENDIX B
CIRCUITS T0 SUPPRESS SPURIOUS EMISSIONS
W5
1. Strip-line sections in conjunction with capacitors form a
low —pass/band pass filtering between the RF amplifiers,
combiner networks, and output port.
2. A notch filter is incorporated between power combiner
and output terminal to pilot signal.
CIRCUITS TO SUPPRESS SPURIOUS
EMISSIONS
FCC ID: CKEJHU-1961
APPENDIX 8
\menu\w555\JR01961
APPLICANT: JAPAN RADIO CO.. LTD FCC ID N0.: CKE JHU»1961
Exhibit 1
CERTIFICATION OF DATA
The technical data contained in this application has been taken under my supervision, is
certified true and correct.
/M W1
P N'
Engineering, Section 11
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