RAKwireless WisDevice RAK72 Series User manual
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Table of Contents
1. Outdoor Surge Protection System..................................................................................................... 3
1.1 Antenna Grounding........................................................................................................................... 3
1.2 Gateway Grounding.......................................................................................................................... 3
2. Indoor Surge Protection System.........................................................................................................4
3. Recommended Equipment................................................................................................................... 5
3.1 Lightning Arrestor for the LoRa, LTE and Wi-Fi Antennas....................................................... 5
3.2 Lightning Arrestor for GPS Antenna............................................................................................... 8
3.3 Antenna Feeder Line...................................................................................................................... 11
3.4 Signal Surge Protective.................................................................................................................. 12
4. Revision History....................................................................................................................................14
5. Document Summary.............................................................................................................................14
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1. Outdoor Surge Protection System
1.1 Antenna Grounding
RAKwireless recommends a lightning arrestor to be installed on all the antenna N-
Type terminals (LoRa, LTE, Wi-Fi and GPS). It is recommended to use a 10 AWG or
better grounding wire to connect the arrestor to the tower mounted LoRa antenna.
The arrestors have to be Female to Male type in order to fit the antenna and housing
connectors. Make sure you use a 10 AWG or better wire to connect the screw
terminals of the arrestors to the grounding rail mounted on the building wall
(grounding bar in case of field deployment as in the following picture).
GPS Lightning Arrester LoRa Lightning Arrester
1.2 Gateway Grounding
Additionally, it is recommended to use another 10 AWG or better grounding wire to
connect the screw terminal on the bottom right side of the Gateway casing to the
grounding rail (bar). This is can be seen circled in blue in the first image to the right of the
GPS Lightning Arrester.
Note: No additional protection for the Ethernet cabling is required at the Gateway side.
There is a surge protection system built-in (GDT + Anti-surge resistor).
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2. Indoor Surge Protection System
For the purpose of protecting the indoor equipment and circuitry connected to the LoRa
Gateway you need to install an Ethernet port SPD lightning arrester. It should be position
along the cabling connecting the Gateway to the PoE injector. Make sure you connect its
grounding wire terminal to an appropriate building grounding point. Thus, your PoE
injector and network switch/router should be surge protected.
Please refer to the images in the diagram below for the Outdoor and Indoor portion of the
surge protection system. Should you fail to adhere to the recommendations in this
document RAKwireless carries no responsibility for any damage your equipment incurs
due to lightning strike!
Note: Make sure to provide all the grounding points for the antennas (GPS arrester is of a
different class as seen below), gateway housing, and Ethernet SPD. Additionally, make
sure you have a well-grounded pole with a lightning rod for the LoRa Antenna. The
lightning rod should be high enough that all the equipment falls below the 45-degree
angle as seen in the picture.
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3. Recommended Equipment
3.1 Lightning Arrestor for the LoRa, LTE and Wi-Fi
Antennas
This is a surge protective device for securing transceivers against over-voltage and
surge current induced by bolts of lightning.
RAKwireless recommends installing lightning arrestor on all N-type antenna terminals
including LoRa, LTE, and 2.4G Wi-Fi antennas.
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1. Electrical parameters
Parameter
Value
Remarks
Frequency range
DC～2700MHz
SPD type
Switch type
Connector
N-F/M
Impedance
50Ω
Maximum transmission power
≤200W
DC operating voltage
600V±25%
90V ：LA-GT2700 DN1-1
230V：LA-GT2700 DN1-2
300V：LA-GT2700 DN1-3
470V：LA-GT2700 DN1-4
600V：LA-GT2700 DN1-5
VSWR
DC-2000MHz：≤1.2
Other Frequencies：≤1.25
Insertion loss
DC-2000MHz：≤0.2dB
Other Frequencies：≤0.3dB
Nominal discharge current In
10kA
8/20µs
Maximum discharge current Imax
20kA
8/20µs
Voltage Protection Level
Up
≤1200V
Degree of ingressive protection
IP67
GB 4208
Mounting
N-F end through wall fixed
Grounding
N-F end through wall fixed or grounded terminal grounding
Weight
≤180g
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3.2 Lightning Arrestor for GPS Antenna
This lightning arrestor connects between the antenna and GPS receiver. A surge
protection device for securing transceivers against transients, over-voltage, and surge
currents induced by bolts of lightning.
By adopting a high pass filter, this product can effectively suppress the low-frequency
interference induced by lightning while letting through the GPS signal with low insertion
loss. A transient suppression device (TSD) and a gas discharge tube (GDT) is adopted
for the protection of the DC feed circuit.
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1. Parameters
Parameter
Value
Remarks
Impedance
50Ω
Frequency range
1500MHz～1650MHz
VSWR
≤1.2
Insertion loss
≤0.3dB
RF power
＜50W
DC feed voltage
6V
DC feed current
500mA
Nominal discharge current
10kA
8/20µs
Maximum discharge current
20kA
8/20µs
Limiting voltage
≤15V
10kA，8/20us
Degree of ingressive protection
IP65
GB4208
Connector
Surge side：N connector，Female; Protected side: N
connector, Male
Grounding wire
Yellow-green dual color wire of 10AWG
Grounding connection
Pressed connection by N type nut
Weight
≤200g
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3.3 Antenna Feeder Line
Antenna Feeder Line for RAK7249. This antenna feeder line is an NJ-NF adapter cable
with a length of 1.5m. It is an RG8 coaxial cable with N-type connector as the antenna
feeder.
1. Specifications
2. RAK Store Link
https://store.rakwireless.com/products/antenna-feeder-line
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3.4 Signal Surge Protective
This surge protective device is suitable for Category 6 cable or Class E cable for
protection of equipment from surge and over-voltage induced by lightning or produced
in the inner systems.
It is widely used in office and industry network wiring projects for telecommunication
applications, such as Gigabit Ethernet, ATM, ISDN and VoIP systems.
High performance chips with smallest parasitic capacitance are adopted in the product,
line protection for all the 8 lines, fast response (making it suitable choice for protection
of lightning effect).
Multiple stage protection structure provides good protection against lightning effect. The
tolerable lightning impulse current is 10 kA (between the 8 lines in total to the PE).
1. Overview
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2. Electrical parameters
Item
Parameters
Protection Modes
L-L/L- PE
Maximum Continuous Operating
Voltage Uc
5V
Rated Operating Current
100mA
Tolerable Impulse In
L- L：3kA
L-PE：3kA
Maximum Discharge Current Imax
L (8 Wires in Total) - PE：10 kA
Voltage Protection Class
L-l：≤ 40V
L-pe：≤ 600V
Response Time
1ns
Maximum Data Rate
1000mbps
Connector
RJ45
Line Number Assignment
½,3/6 ,4/5,7/8
Degree of Ingressive Protection
IP20
Operating Environment
Ambient Temperature: -40°C~+85°C
Relative Humidity: 5%-95%
Air Pressure: 70kPa~106kPa
Storage Environment
Storage Temperature: -40°C~+85°C
Relative Humidity: 5%-95%
Storage Time Limit: One Year
3. RAK Store Link
https://store.rakwireless.com/products/signal-surge-protective
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4. Revision History
Revision
Description
Date
1.0
Initial version
2019-04-19
1.1
Lightning rod, GPS Arrester added
2019-04-22
1.2
Rod guarding angle and wire type change.
2019-04-23
1.3
Fixing of minor typos
2019-05-14
1.4
Add the detailed specifications and Signal Surge
Protective
2019-09-24
1.5
Corrections to the System Image and some minor
adjustments to formatting
2019-09-26
5. Document Summary
Prepared by
Checked by:
Approved by:
Vladislav & Todor
Vladislav
About RAKwireless:
RAKwireless is the pioneer in providing innovative and diverse cellular and LoRa
connectivity solutions for IoT edge devices. It's easy and modular design can be used in
different IoT applications and accelerate time-to-market.
For more information, please visit RAKwireless website at www.rakwireless.com.
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