New Japan Radio NJS8451 Series User manual

Date
March 13, 2020
- Specification -
C-band LNA
Model No. NJS8451 series
Model No.
RF
Frequency
NJS8451
4.5 to 4.8 GHz
NJS8452
3.4 to 4.2 GHz
RF Input Interface: Waveguide, CPR-229G
RF Output Interface: N-type, Female Connector
DC Power Input: RF Output Interface Connector
DC Power Voltage Range: +12 to +28 V
Copyright ©
New Japan Radio Co., Ltd.
Microwave Division
-Notice of Proprietary Information-
This document and contents are proprietary to New Japan Radio Co., Ltd.
This publication and contents may not be reproduced or distributed for any other purpose
without the written permission of New Japan Radio Co., Ltd.
Specifications listed in this document are subject to change at any time, without notice.
New Japan Radio Co., Ltd.
Microwave Division
Title:
Datasheet of NJS8451 series
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
1 / 14
Released

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
2
Caution
1. While New Japan Radio., Ltd.(NJR) continually strives to improve the quality and reliability of any products, failures would occur in
microwave products over time. For this reason, it is important that customers fulfill their responsibilities to ensure designed-in
safety – including failsafe functions, redundancy, and measures to prevent malfunctions and the spread of fire – in order to avoid
injuries, accidents, or social repercussions resulting from the failure of any product related to satellite communications on this
document (hereinafter, “the product”). Customers must pay careful attention to ensuring the safety of their equipment.
2. The product is designed and tested to function in accordance with its specifications. Do not use under conditions that deviate from
the product specifications included in the specifications. NJR assumes no responsibility and shall not be liable for any injuries,
accidents, or social repercussions resulting from the product being in a poor or damaged state because it was used under conditions
that depart from the specifications.
3. The product is covered by a warranty for one year following delivery unless otherwise stipulated in the contract or delivery
conditions. In the event of a failure for which NJR are responsible occurring during the warranty period, NJR undertake to repair or
replace the product free of charge. Note, however, that the warranty does not cover failures such as those listed here (see bullets
below), even if they occur within the warranty period. In addition, in the case of a product being repaired or replaced by us, the
starting date for the warranty period is still the original delivery date of the product.
Failure due to the product being used in conditions other than those stipulated in the data sheet, specification sheet, etc.
Failure due to modifications or repairs carried out by some entity other than our company
Failure determined to be the result of unsuitable maintenance or replacement of a consumable item that requires due
maintenance
Failure due to circumstances that were unforeseeable given the scientific /technological standards at the time of shipment
Other failures due to external factors such as fire, earthquake, flood and power supply anomalies for which NJR are not
responsible
In addition, the product warranty is limited to the provision of repair services or replacement at no cost. It does not cover secondary
damage (to equipment, business opportunities, profits, etc.) or any other damage that may have resulted from failure of the
product.
4. The product must be handled appropriately to ensure its continued reliability. Since it can be damaged by the intrusion of water,
dust, oil, chemicals, etc., it must be given appropriate protection. Even in the case of a product with an airtight construction, avoid
using it in an environment that exceeds the stated levels of waterproofing/dustproofing. Also, be sure to use connectors and
waveguides properly.
If replacement parts such as fans are included, proper maintenance is necessary. To maintain product performance and
functionality, it is necessary to conduct inspections and maintenance at appropriate intervals and exchange replacement parts when
necessary. Improper inspections or maintenance may result in failure.
In addition, the warranty does not cover the use of the product in areas where salt damage can be expected or where there is a
substantial presence of corrosive gases such as Cl2, H2S, SO2, and NO2. If the product is to be used in such areas, at the time of
installation you must take appropriate steps to protect the product.
5. If the product is to be used with equipment/systems that must meet special quality and reliability standards (aerospace equipment,
medical equipment, power generation control equipment, automotive/railway transportation equipment, safety equipment,
disaster prevention and security equipment, etc.), please consult with our sales staff in advance.
6. This product contains gallium arsenide (GaAs), classified as a harmful substance. To avoid danger, do not incinerate, crush, or
chemically treat the product in such a way that gases or dust are released. When disposing of the product, comply with all applicable
laws and regulations and do not treat it as general industrial waste or household waste.
7. When exporting a product or technology, observe export laws and regulations such as those governing foreign exchange and foreign
trade, and obtain any necessary licenses for export, service transactions, etc. NJR request that you do not use our products or the
technical data published on this document for developing weapons of mass destruction or for any other military purposes or
applications.
8. The product specifications in this document are subject to change without notice. If you are considering using a product, delivery
specifications must first be settled.

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
3
Scope
This LNA is intended for the satellite communication data downlink application in C-band. It is
combined a 3-stage HEMT amplifier.
The LNA receives an RF signal (C-band: 3.4 to 4.2 GHz, or 4.5 to 4.8 GHz) as input, amplifies and
outputs the RF signal. It is operated by +24 V DC power (range: +12 to +28 V) input.
The LNA comes in a single, weatherized housing rated for outdoor use, and has a CPR-229G waveguide
flange as RF input and an N-type female connector as RF output.
Fig.1 Functional Block Diagram
Series Model Number
Numbering System
Line-up

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
4
1. Electrical Specifications
#
Items
Specifications
1.1. Absolute Maximum Rating
[RF Input Power]
[Supply Voltage]
-10 dBm (@ CW), +10 dBm (@ Pulse)
+30 V DC
1.2.
Input RF Frequency Range
< Model No. NJS8451 >
4.5 to 4.8 GHz
< Model No. NJS8452 >
3.4 to 4.2 GHz
1.3.
Input RF Level
-135 to -65 dBm
1.4.
Noise Temperature @ +25 ºC
15 K typ., 30 K max.
1.5.
Conversion Gain @ +25 ºC
< Model No. NJS8451 >
55 dB min., 62 dB max.
< Model No. NJS8452 >
48 dB min., 55 dB max.
1.6. Conversion Gain Ripple @ +25 ºC 2 dBp-p max.
at any 50 MHz segments.
1.7. Conversion Gain Flatness over Frequency
@ +25 ºC
< Model No. NJS8451 >
3 dBp-p max. over 300 MHz BW
< Model No. NJS8452 >
5 dBp-p max. over 800 MHz BW
1.8.
Conversion Gain Variation over Temperature
5 dB max.
1.9.
Output Power @ 1dB G.C.P. (P1dB)
+7 dBm min.
1.10.
Output Intercept Point
+19 dBm min.
1.11.
Output V.S.W.R.
2 : 1 typ., 3 : 1 max.
1.12. Power Requirement
[Input Port]
[Input Voltage]
[Current Drain]
RF Output Interface Connector
(Combine DC Power with Output RF Signal)
+12 to +28 VDC
125 mA typ., 160 mA max.

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
5
2. Mechanical Specifications
#
Items
Specifications
2.1.
Input Waveguide Flange
Waveguide, CPR-229G (with Groove)
2.2.
RF Interface Connector
Coaxial Connector , N-type Female - 50 ohms
2.3. Dimension & Housing
without Interface Connector
80.8 (L) x 99.6 (W) x 76 (H) mm
[3.18” (L) x 3.92” (W) x 2.99” (H) ]
2.4. Weight 800 g
[1.76 lbs]
3. Environmental Specifications
#
Items
Specifications
3.1. Temperature Range (Ambient)
[Operating]
[Storage]
-40 to +60 ºC
-40 to +80 ºC
3.2.
Humidity
0 to 100 % RH
3.3.
Altitude
15,000 feet (4,572 m)
3.4.
Vibration (Survival)
5 G [49.03 m/s
2
] (3 axis, 50 Hz)
3.5.
Shock (Survival)
15 G [147.1 m/s
2
] (3 axis)
3.6. Waterproof / Dustproof
(IP Code Rating)
IP 67
3.7. Regulations EU Directive (CE Marking)
EMC - 2014/30/EU
RoHS - 2011/65/EU + (EU)2015/863
Safety: EN60950-1
3.8. MTBF
(by Method of Parts Count Reliability
Prediction)
150,000 hours and more at +60 ºC
as Design Condition

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
6
4. Outline Drawing
(e.g. NJS8452)

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
7
5. Label
5.1. Label Outline (e.g. NJS8452)
5.2. Definitions

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
8
6. Package
6.1. Individual Package / Shipping Package

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
9
6.2. Enclosed Accessories
O-ring Gasket, Qty (1), Full-type, for Waveguide Flange
Bolts, Qty (10), #1/4-20UNC x 5/8”, Hexagon Head, SUS
Spring Washers, Qty (10), SUS

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
10
7. Handling Precautions
7.1. DANGER
This statement indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
Items
Description
Input Voltage Only input a DC voltage within the range indicated in specifications.
Do operate with the input voltage range between +12 and +28 V DC power.
When applying higher voltage than specifications (+30 V as absolute maximum
rating), it will not only cause this unit failure, but it may also result in electric
shock and fire.
Disassembling Do not disassemble the unit.
Disassembling will not only cause this unit
failure, but it may also result in
electric shock.
7.2. CAUTION
This statement indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury. The statement may also be used to indicate other unsafe practices or
risks of property damage.
Items
Description
Disposal This unit contains gallium arsenide (GaAs), classified as a harmful substance. To
avoid danger, do not incinerate, crush, or chemically treat the unit in such a way
that gases or dust are released.
When disposing the unit, comply with all applicable laws and regulations and do
not treat it as general industrial waste or household waste.
7.3. NOTE
This statement is used to notify of installation, operation, or maintenance information that is
important, but not hazard-related.
Items
Description
Torque
Management
Do not tighten with excessive torque when attaching screws/bolts and
connectors.
The following value as tighten torque is recommended.
Screws/Bolts - #1/4-20UNC: 5.11 to 5.24 N⋅m

RF Connector (N-type): 0.68 to 1.13 N⋅m

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
11
Items
Description
Weatherproof The unit
mounted in outdoor should be conducted with adequately
weatherproof procedure.
Do seal all of cable connection points from the connector to the cable sheath by
usage of self-amalgamating tape.
Ensure the waveguide connection is properly assembled with the enclosed
o-ring gasket as accessories.The o-ring gasket is full-type and it is assumed to
connect the unit to a grooved waveguide flange.
Input Voltage Do operate with the input voltage range between +12 and +28 V DC power.
Avoid applying more than the maximum voltage in this range (including ripple
voltage) under any conditions.
Input RF Signal
Power
Do not supply the input RF signal over the absolute maximum rating indicated in
specifications (-10 dBm @ CW / +10 dBm @ Pulse).
High
Temperature
Operation
It may cause damage and/or degradation of reliability / lifetime to operate the
unit in a condition where the ambient temperature exceeds the maximum value,
+60 °C, at operating temperature described in the specifications.
Vibration
/Shock
When vibration and/or shock impact exceeding the conditions described in the
specifications is applied, internal parts may be damaged.
Warranty The unit is covered by a warranty for one(1)
year following delivery unless
otherwise stipulated in the contract or delivery conditions.
Repairs may be possible under payment of charge even for the unit whose
warranty period has expired.
Opening, removing, disassembling and modifying any parts and components
(including the product label, sealing tape and screws)
without fan equipment
will immediately void the warranty.
In any case, the unit of invalid warranty cannot be repaired.

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
12
8. Instructions Manual
8.1. Descriptions
This section describes the information of connectors and etc.
Items
Description
Purpose
RF Input
Waveguide
Waveguide: WR-229
Flange: CPR-229G
(with Groove)
The LNA receives an RF signal of C-
band (3.4 to 4.2
GHz, or 4.5 to 4.8 GHz) via this waveguide.
RF Output
Connector
N-type Female Coaxial
Connector, 50 Ohms
The LNA outputs an RF signal of C-band (3.4 to 4.2 GHz,
or 4.5 to 4.8 GHz) and requires to supply +12 to +28 V
DC power via this connector.
8.2. Connection and Installation
This section describes basic installation for the LNA.
8.2.1. Mounting Configuration
The Unit can be mounted with OMT or the waveguide filter of the satellite antenna.
When mounting with the OMT or the waveguide filter, the following steps should be complied:
Step 1: Verify that the groove on the waveguide flange for a gasket is clean.
The enclosed gasket as
accessories is full-type and it
is assumed to connect the
LNB to a grooved waveguide
flange. Insert the gasket the
groove as shown in the figure
on the right

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
13
Flange Thickness
of OMT/Filter
Screw
Length
4 to 7 mm
[0.15” to 0.275”]
1/2”
7 to 10 mm
[0.275” to 0.4”]
5/8”
10 to 13 mm
[0.375” to 0.525”]
3/4”
Step 2: Secure the OMT or the filter to the LNA by
tightening the enclosed hexagon head bolts
(#1/4-20UNC L = 5/8”) with 5.11 to 5.24 N⋅m
torque as shown in the figure below, when the
thickness of the flange of the OMT or filter is
assumed to be 7 to 10 mm. The enclosed
washers as accessory must be inserted to bolts
before tightening bolts.
When the thickness is other than 7 - 10 mm,
the appropriate length screws or bolts based
should be prepared on the table on the right.
8.2.2. Connecting Coaxial Cable
The LNA is connected the modem with a coaxial cable, and requires
to supply +12 to +24 V DC power from the modem. For external
reference models, a 10 MHz reference signal shall be supplied.
The connection of coaxial cable should be complied with the following
steps:
Step 1: Connect the coaxial cable with the N-type male
connectors to the coaxial connecter equipped with the
LNA which is shown in the figure on the right below
under 0.68 to 1.13 N⋅m tighten torque.
Step 2: Use self-amalgamating tape to seal connector and
cable entry points from the connector to the cable
sheath.
Do not power on the modem before finishing all of steps of Connecting Coaxial Cable.

NJS8451 series
＊Above specifications are subject to change without notice.
Reference No.:
DS-S8451
Rev.:
10E
Sheet:
14
8.2.3. Start-up
Start-up will be immediately performed with the following step:
Step: Power on the modem and supply the DC voltage (and 10 MHz reference) from modem.
Only input a DC voltage within the range indicated in specifications.
Do operate with the input voltage range between +12 and +28 V DC power.
When applying higher voltage than specifications (+30 V as absolute maximum rating), it will not
only cause this unit failure, but it may also result in electric shock and fire.
Do not power on the modem before finishing all of steps of Connecting Coaxial Cable.
The LNA must be adequately weatherproofed to place in outdoor.
Ensure that the waveguide joint is properly sealed with the enclosed o-ring gasket.
Do seal all of cable connection points from the connector to the cable sheath by usage of
self-amalgamating tape.