manualshive.com logo in svg

US Robotics Courier USR3500, Reference Manual

Share
Download
US Robotics Courier USR3500 Reference Manual Download Page 48

 

 

Rev 1.0 

1/27/14 

48 

7.  Recommendations when Using the 

USR3500 on Trucks 

Caution: 

The power supply connection of the modem must 

never

 be directly connected to the truck battery. 

7.1.  Recommended Power Supply Connection on 

Trucks 

All trucks have a circuit breaker on the exterior of the cabin. The circuit breaker is 
used for safety reasons: if a fire blazes in the trucks, (for example, on the wiring trunk) 
the driver may cut the current source to avoid any damage (explosion). The circuit 
breaker is connected to the truck ground, most often associated with the fuse box. 

Most truck circuit breakers do not cut the Positive Supply line of the battery, but cut 
the ground line of the latter. 

 

Figure 27.  Recommended Power Supply Connection on Trucks 

The figure above shows the recommended power supply connection where the 
ground connection of the modem is not directly connected to the battery but is 
connected after the Circuit Breaker (on the truck ground or the fuse box). 

Summary of Contents for Courier USR3500

Page 1: ...Courier M2M 3G Cellular Modem USR3500 Reference Guide ...

Page 2: ...t is on the ground or in flight In aircraft the modem MUST BE POWERED OFF When operating the modem can transmit signals that could interfere with various onboard systems Note Some airlines may permit the use of cellular phones while the aircraft is on the ground and the door is open Modems may be used at this time The driver or operator of any vehicle should not operate the modem while in control ...

Page 3: ...ir respective affiliates aggregate liability arising under or in connection with the Sierra Wireless USRobotic product regardless of the number of events occurrences or claims giving rise to liability be in excess of the price paid by the purchaser for the Sierra Wireless USRobotics product Customer understands that neither Sierra Wireless nor USRobotics is providing cellular or GPS including A GP...

Page 4: ...m InterDigital Group and MMP Portfolio Licensing Copyright 2014 USRobotics All rights reserved Trademarks USRobotics CourierTM and the USRobotics logo are registered trademarks of USRobotics Sierra Wireless AirPrime AirLink AirVantage and the Sierra Wireless logo are registered trademarks of Sierra Wireless Windows is a registered trademark of Microsoft Corporation QUALCOMM is a registered tradema...

Page 5: ...Rev 1 0 1 27 14 5 5 Reference Guide Document History Version Date Updates 1 0 Initial release ...

Page 6: ... Supply Connector 15 3 1 2 Serial Interface 21 3 1 3 USB Interface 29 3 2 Back Interface 30 3 2 1 SIM Interface 30 3 2 2 RF Interface 31 4 SIGNALS AND INDICATORS 37 4 1 Alarm Mode 37 4 2 RESET Signal Connection 37 4 2 1 Reset Sequence 39 4 3 LED Status Indicator 39 4 4 Real Time Clock RTC 40 4 5 Interrupt 40 5 EXPANSION 41 5 1 Expansion Compartment 41 6 POWER CONSUMPTION 42 6 1 Various Operating M...

Page 7: ...tions 51 8 3 1 Function Status Classification 52 9 CERTIFICATION COMPLIANCE AND RECOMMENDED STANDARDS 53 9 1 Certification Compliance 53 9 2 Applicable Standards Listing 54 10 SAFETY RECOMMENDATIONS 55 10 1 General Safety 55 10 2 RF Safety 57 10 2 1 General 57 10 2 2 Exposure to RF Energy 57 10 2 3 Efficient Modem Operation 57 10 3 Vehicle Safety 57 10 4 Care and Maintenance 58 10 5 Your Responsib...

Page 8: ...13 Equivalent circuit of VOH Vref 2 8V 19 Figure 14 15 Pin Serial Connector 21 Figure 15 RS232 Serial Link Signals 23 Figure 16 V24 Serial Link Implementation for a 5 wire UART 24 Figure 17 V24 Serial Link Implementation for a 4 wire UART 24 Figure 18 V24 Serial Link Implementation for a 2 wire UART 25 Figure 19 Equivalent Circuit of CSPK 28 Figure 20 Mini B USB Connector 29 Figure 21 USR3500 Back...

Page 9: ... Table 14 Electrical Characteristics of CSPK for USR3500 28 Table 15 Recommended Speaker Characteristics 28 Table 16 Mini B USB Pin Description 29 Table 17 USB Electrical Characteristics for USR3500 29 Table 18 SIM Socket Pin Description 31 Table 19 Available RF Interfaces 31 Table 20 Main Receiver Parameters for USR3500 32 Table 21 Main Transmitter Parameters for USR3500 32 Table 22 Antenna Speci...

Page 10: ...s 44 Table 35 Power Consumption of USR3500 in Non Connected Mode with UART ON FLASH LED OFF and USB OFF typical values 47 Table 36 Standards Conformity for the modem 50 Table 37 Applicable Standards and Requirements for the modem 50 Table 38 Operating Class Temperature Range 51 Table 39 ISO Failure Mode Severity Classification 52 Table 40 Standards Conformity for USR3500 53 Table 41 Applicable Sta...

Page 11: ...Functional Specifications This section discusses the functional specifications of the USR3500 1 1 Functional Architecture The global architecture of the USR3500 is shown in the figure below Figure 1 Functional Architecture ...

Page 12: ...1 3 Operating System The modem is Open AT Application Framework compliant With the Courier M2M Open AT application loaded the modem becomes a solution for many specific market needs The operating system of the modem is responsible for the following functions AT Command processing Real Time Clock RTC with calendar ...

Page 13: ...ics Operating Voltage Range 4 75V to 32V DC nominal at 13 2V Maximum Current Typical 850mA average at 4 75V 3 7A Peak at 4 75V The modem is permanently powered once the power supply is connected In the case of Alarm mode Low Power mode the user can set the modem Turn on time Refer to section 4 1 Alarm Mode for more information Caution The minimum input voltage specified here is the modem input Be ...

Page 14: ...Rev 1 0 1 27 14 14 14 Reference Guide Technical Specifications 2 2 Mechanical Specifications Figure 3 USR3500 Mechanical Drawing ...

Page 15: ...ondary RF Interface GPS RF Interface SIM Interface LED Status Indicator 3 1 Front Interface Figure 4 Front Interface 3 1 1 Power Supply Connector The power supply connector is a 10 pin Micro Fit connector that is used for External DC Power Supply connection with voltage from 4 75V to 32V at 3 7A GPIO connections and GPIO voltage reference ON OFF pin to power OFF the modem Interrupt pin Mini B USB ...

Page 16: ...pin to power OFF the modem 9 Reserved Reserved 10 Reserved Reserved The input voltage range DC IN is from 4 75V to 32V with a typical operating voltage of 13 2V Caution Pins 1 2 3 4 5 8 9 and 10 are low voltage interfaces It is strictly prohibited to connect these pins to any power supply as there is a risk of damaging the modem 3 1 1 1 General Purpose Input Output The modem has two external GPIO ...

Page 17: ...wire cable accessory When the voltage reference Vref is not connected if one of the GPIO output is in High state while the other is in Low state the GPIO in high level voltage will be at 2 3V To avoid this voltage drop it is recommended to use Vref to the desired output voltage With Vref connected to 2 8V both GPIO35 and GPIO25 may be interfaced with a component that complies with the following le...

Page 18: ...V With Vref 2 8V both GPIO35 and GPIO25 may be interfaced with a component that complies with the following levels Table 5 GPIO Pin Operating Conditions when Vref 2 8V Parameter Min Typ Max Condition VIL 0 84V Please refer to Figure 10 VIH 1 96V Please refer to Figure 11 VOL 058 0 110 Vref Please refer to Figure 12 VOH Vref modem Zout 100K Pull up to Vref please refer to Figure 13 ...

Page 19: ...ure 10 Equivalent Circuit of VIL Vref 2 8V Figure 11 Equivalent circuit of VIH Vref 2 8V Figure 12 Equivalent circuit of VOL Vref 2 8V Figure 13 Equivalent circuit of VOH Vref 2 8V The GPIO pin is mainly used to Act as a switch for a transistor when the GPIO is configured as output ...

Page 20: ...e GPIO as an output Enter the following commands AT WIOM 1 GPIO21 1 0 à this command activates GPIO21 as an output and sets it at a low level AT WIOW GPIO21 1 à this command sets the output level of GPIO21 to HIGH 3 1 1 1 2 Setting the GPIO as an Input Refer to the following example for how to configure the GPIO as an input Enter the following commands AT WIOM 1 GPIO21 0 à this command activates G...

Page 21: ...til AT CPOF is sent to turn the device OFF To enable the low power mode the user may simply pull the ON OFF pin to GND and send AT CPOF to the modem using a communication software such as a HyperTerminal Table 7 ON OFF Pin Description Pin Signal I O I O Voltage Description 8 ON OFF I 4V Pin to turn the modem ON OFF Refer to the power consumption tables in section 6 Power Consumption for the power ...

Page 22: ...a Terminal Ready 9 GND GND Ground 10 CSPK2P O Analog Speaker positive input 11 CT106 CTS O 5 5V Z Clear To Send 12 CT105 RTS I 5 5V Z Request To Send 13 CT125 RI O 5 5V Undefined Ring Indicator 14 RESET I O 1V8 Modem Reset 15 CSPK2N O Analog Speaker negative input 3 1 2 1 RS232 Serial Link Connection Also known as the main serial link the RS232 interface performs the voltage level adaptation V24 C...

Page 23: ...tion during transmission The USR3500 also implements the Serial Port Auto Shut Down feature with the DTR signal It is recommended to use the CT108 2 DTR signal to benefit from the current consumption improvement performed by this feature 3 1 2 2 RS232 Implementation The following subsections describe how the RS232 serial link can be implemented to suit different designs 3 1 2 2 1 5 wire Serial Int...

Page 24: ... in this interface are as follows CT103 TXD CT104 RXD CT105 RTS CT106 CTS Figure 17 V24 Serial Link Implementation for a 4 wire UART 3 1 2 2 3 2 wire Serial Interface RS232 Implementation The signals used in this interface are as follows CT103 TXD CT104 RXD Note Although this case is possible it is not recommended The flow control mechanism must be managed from the customer end ...

Page 25: ...e Guide at http www usr com support 3500 for more information 3 1 2 4 Serial Port Auto Shut Down Feature The RS232 serial link can be shut down when there is no activity between the DTE and the modem This can help improve the power consumption performance The Serial Port Auto Shut Down feature is controlled by the AT command AT WASR Enter AT WASR 1 to enter the serial port auto shut down mode AT W...

Page 26: ...GT Refer to documents the AT Commands Interface Guide at http www usr com support 3500 for more information about these AT commands The following table shows the pin assignments of the microphone input Table 9 Microphone Pin Description for USR3500 Sub D 15 pin Pin Signal I O I O Type Description 4 CMIC1P I Analog Microphone positive input 5 CMIC1N I Analog Microphone negative input Table 10 Equiv...

Page 27: ...ations 3 1 2 5 2 Speaker The speaker outputs are connected in differential mode to reject common mode noise and TDMA noise Speaker outputs are connected to internal push pull amplifiers and may be loaded down with components between 32 150Ω and up to 1nF These outputs may be directly connected to a speaker The output power may be adjusted by 2dB steps The gain of the speaker outputs is internally ...

Page 28: ... 32Ω 22 mA POUT RL 16Ω AT VGR 1600 25 mW RL 32Ω AT VGR 1600 16 27 mW RPD Output pull down resistance at power down 28 40 52 kΩ The output voltage depends of the output speaker gain set by AT command Refer to the AT Commands Interface Guide at http www usr com support 3500 This value is given in dB but it s possible to toggle this to index value Refer to the following table for the list of recommen...

Page 29: ... interface negative 3 D Differential data interface positive 4 ID Not connected 5 GND Ground The USR3500 USB slave interface complies with USB 2 0 protocol signaling and with USB 2 0 electrical interface The USB interface features 480Mbit s high speed transfer rate 3 3V type compatible USB Soft connect feature USB Download feature CDC 1 1 ACM compliant Table 17 USB Electrical Characteristics for U...

Page 30: ...ted to the USR3500 through the embedded SIM socket This interface controls 3V 1V8 SIM cards and it is fully compliant with GSM 11 11 recommendations concerning SIM functions The SIM interface of the USR3500 is ESD protected Transient overvoltage protections in ESD are internally added on the signals connected to the SIM interface in order to prevent any damage from electrostatic discharge The SIM ...

Page 31: ...t 10KΩ SIMPRES pull low is about 100KΩ 3 2 2 RF Interface The USR3500 has three RF interfaces Refer to the following table for the list of available RF interfaces Table 19 Available RF Interfaces Main RF Interface Secondary RF Interface GPS RF Interface ü ü ü The main antenna connector allows the transmission of radio frequency RF signals from the device to an external customer supplied antenna Th...

Page 32: ...er and the Transmitter Table 20 Main Receiver Parameters for USR3500 Parameters Typical Values GSM850 Reference Sensitivity 108dBm E GSM900 Reference Sensitivity 109dBm DCS1800 Reference Sensitivity 107dBm PCS1900 Reference Sensitivity 107dBm 3G Band I 2100 Reference Sensitivity 108dBm 3G Band II 1900 Reference Sensitivity 107dBm 3G Band V 850 Reference Sensitivity 110dBm 3G Band VI 800 Reference ...

Page 33: ...have the following characteristics Antennas used with the USR3500 must have a maximum antenna gain of 1 dBi for Bands 900 and 1800 and 2 5 dBi for Band 2100 Table 22 Antenna Specifications for USR3500 Characteristics GSM850 and WCDMA Band V WCDMA Band VI EGSM 900 and WCDMA Band VIII DCS 1800 PCS 1900 and WCDMA Band II WCDMA Band I TX Frequency 824 to 849 MHz 830 to 840 MHz 880 to 915 MHz 1710 to 1...

Page 34: ... the following sub sections This GPS feature can be used through AT commands provided by the Extended Open AT application which is pre loaded at the factory or from a custom Open AT application using Location Library 3 2 2 3 1 Standalone GPS Leading standalone autonomous GPS performance 145 dBm cold start sensitivity 153 dBm hot start sensitivity 155 dBm tracking sensitivity 45 second average cold...

Page 35: ...Rev 1 0 1 27 14 35 35 Reference Guide Interfaces Best if downloaded once every 1 2 days but valid for up to 7 days with some accuracy degradation ...

Page 36: ... Control Plane CP UE assisted and UE based GSM Control Plane CP UE assisted and UE based 3 2 2 3 4 Enhanced Navigation 2 0 Feature Provides leading performance in car and walking navigation modes as well as accuracy while stationary Airline Game Offline mode GPS capability is available while phone is offline 3 2 2 3 5 NMEA Supported sentences GGA GSA GSV RMC VTG 3 2 2 3 6 Active GPS Antenna Bias T...

Page 37: ...to the AT CCLK command in the AT Commands Interface Guide at http www usr com support 3500 4 2 RESET Signal Connection This signal is used to force a reset procedure by providing the USR3500 with a LOW level that lasts at least 200µs when the power supply is already stabilized It is activated by either an external Reset signal or by an internal signal from the Reset generator and is automatically ...

Page 38: ...edance C 20 nF Internal pull up Table 27 Reset Operating Conditions Parameter Minimum Typical Maximum Unit Reset time Rt 1 200 µs Reset time Rt 2 at power up only 20 40 100 ms Cancellation time Ct 34 ms VH 0 57 V VIL 0 0 57 V VIH 1 33 V VH Hysterisis Voltage 1 This reset time is the minimum to be carried out on the Reset signal when the power supply is stabilized 2 This reset time is internally ca...

Page 39: ...com support 3500 for more information regarding AT commands 4 3 LED Status Indicator The USR3500 has a red LED that indicates the current operational status of the device Table 28 USR3500 LED Status USR3500 State LED Status USR3500 Status ON Permanently lighted The modem is switched ON but not registered in the network Flashing slowly LED is ON for 200ms OFF for 2s The modem is switched ON and is ...

Page 40: ...riod is measured when the RTC battery is fully charged before the modem is unplugged from the DC power source This RTC time period is for temperature from 20 C to 60 C Once the operating storage temperature is beyond this range this time period is not guaranteed Caution When the modem is shipped out the charging voltage of the RTC battery is not guaranteed Once the modem is on power the RTC batter...

Page 41: ...mpartment allows users to easily expand the USR3500 s features Ethernet for example for their own applications Figure 26 USR3500 expansion compartment Refer to the Ethernet Expansion Card User Guide at http www usr com support 3500 for more information regarding this feature ...

Page 42: ...ting mode used Refer to the table below for the different kinds of operating modes available Refer to Appendix 3 1 of the AT Commands Interface Guide at http www usr com support 3500 for the working mode description Table 32 USR3500 Operating Modes Operating Mode Description GSM Connected Mode The modem is connected to a live GSM network during circuit switch voice or data call Transfer Mode The m...

Page 43: ...led by AT command Refer to section 3 1 2 4 Serial Port Auto Shut Down Feature for more information on this feature FLASH LED Activated Deactivated The modem Flash LED can be enabled or disabled by AT command Refer to section for more information on this feature 6 2 Working Mode Features The table below sums up the feature availability in each mode Table 33 USR3500 Operating Modes Feature Availabil...

Page 44: ...Hz PCL0 gamma 3 253 83 36 2008 486 mA GPRS class 10 2TX 3RX 850 MHz PCL5 gamma 3 654 174 76 3503 880 mA 900 MHz PCL5 gamma 3 698 185 78 3489 1001 mA 1800 MHz PCL0 gamma 3 476 143 61 2348 910 mA 1900 MHz PCL0 gamma 3 459 129 58 2201 833 mA GPRS class 12 4TX 1 RX 850 MHz PCL5 gamma 3 467 147 72 1414 749 mA 900 MHz PCL5 gamma 3 519 180 75 1510 787 mA 1800 MHz PCL0 gamma 3 553 184 78 1587 794 mA 1900 ...

Page 45: ...Bm 206 73 33 1117 430 mA Band VI 22 dBm 669 221 92 1133 827 mA 10 dBm 216 76 32 1170 406 mA Band VIII 22 dBm 594 201 87 1045 1003 mA 10 dBm 330 118 52 810 708 mA HSDPA Data Transfer 2 Cat 10 14 4 Mbit s Band I 22 dBm 736 243 103 1155 754 mA 10 dBm 314 109 48 747 592 mA Band II 22 dBm 636 213 96 1032 724 mA 10 dBm 322 107 46 703 585 mA Band V 22 dBm 664 225 96 1024 863 mA 10 dBm 278 98 42 774 509 m...

Page 46: ...Rev 1 0 1 27 14 46 46 Reference Guide Power Consumption 6 4 Non Connected Mode Power Consumption Note The USB port must be deactivated to enter Sleep Mode ...

Page 47: ...tive Idle Mode HSPA ON 45 82 16 56 7 6 mA OFF 15 48 5 96 2 81 mA Sleep Idle Mode HSPA ON 32 66 11 89 5 8 mA OFF 3 09 1 39 0 78 mA Active Idle Mode 2G page 9 ON 46 01 16 47 7 5 mA OFF 16 43 6 01 2 96 mA Sleep Idle Mode 2G page 9 ON 31 91 11 51 5 65 mA OFF 2 7 1 12 0 81 mA Active Idle Mode 2G page 2 ON 47 11 16 82 7 75 mA OFF 17 54 6 4 3 15 mA Sleep Idle Mode 2G page 2 ON 33 51 12 07 5 65 mA OFF 4 3...

Page 48: ...on the wiring trunk the driver may cut the current source to avoid any damage explosion The circuit breaker is connected to the truck ground most often associated with the fuse box Most truck circuit breakers do not cut the Positive Supply line of the battery but cut the ground line of the latter Figure 27 Recommended Power Supply Connection on Trucks The figure above shows the recommended power s...

Page 49: ...re Figure 28 Example of an Electrical Connection That May Damage the modem The figure above gives an example of an electrical connection which may dramatically damage the modem when its ground connection is directly connected to the battery ground In this example when the circuit breaker is switched OFF the current flows through the modem and powers the electrical circuit of the truck for example ...

Page 50: ...ental testing part 2 64 Test FH vibration broadband random and guidance IEC60068232 2 0 Basic environmental testing procedures part 2 Test ED procedure 1 Withdrawn replaced by IEC60068 2 31 For reference only IEC60068231 2 0 Environmental testing part 2 31 Test EC rough handling shocks primarily for equipment type specimens IEC60068229 2 0 Basic environmental testing procedures part 2 Test EB and ...

Page 51: ... IP code IEC60068217 4 0 Basic environmental testing procedures part 2 Test Q sealing IEC60068218 2 0 Environmental testing part 2 18 Tests R and guidance water IEC60068270 1 0 Environmental testing part 2 tests test XB abrasion of markings and letterings caused by rubbing of fingers and hands IEC60068268 1 0 Environmental testing part 2 tests test l dust and sand IEC60068211 3 0 Basic environment...

Page 52: ...performance shall meet the minimum requirements of 3GPP or appropriate wireless standards CLASS B All equipment system functions are fulfilled normally during application of the constraint however one or several of them may be out of the specified tolerances After application of the constraint all functions automatically return within standard limits The memories shall remain in compliance with Cl...

Page 53: ...able Standard Safety Health IEC 60950 2005 A1 2009 EN 60950 2006 A11 2009 A1 2010 A12 2011 EN 62311 2008 Efficient use of the radio frequency spectrum EN 301 440 1 v1 6 1 EN 301 440 2 v1 4 1 EN 301 511 v9 0 2 EN 301 908 1 v4 2 1 EN 301 908 2 v5 2 1 EMC EN 301 489 1 v1 9 2 EN 301 489 3 v1 4 1 EN 301 489 7 v1 3 1 EN 301 489 24 v1 5 1 FCC FCC Part 22 24 IC RSS 132 Issue 2 RSS 133 Issue 5 Internationa...

Page 54: ...formance specification TS 51 010 2 10 1 0 3rd Generation Partnership Project Technical Specification Group GSM EDGE Radio Access Network Mobile Station MS conformance specification Part 2 Protocol Implementation Conformance Statement PICS proforma specification TS 51 010 4 4 23 0 3rd Generation Partnership Project Technical Specification Group GSM EDGE Radio Access Network Digital cellular telecom...

Page 55: ...spect restrictions on the use of radio equipment in Fuel depots Chemical plants Places where blasting operations are in progress Any area where the use of a cellular telephone is forbidden or dangerous Any other area where you would normally be advised to turn off your vehicle engine Turn your modem OFF when in any area with a potentially explosive atmosphere It is rare but your modem or its acces...

Page 56: ... and manufacturers recommendations The USR3500 is designed for and intended to be used in fixed and mobile applications Fixed means that the device is physically secured at one location and is not able to be easily moved to another location Mobile means that the device is designed to be used in other than fixed locations and generally in such a way that a separation distance of at least 20 cm 8 in...

Page 57: ...mpliance to all applicable safety standards had been tested it has been concluded that the product was acceptable for use If you are concerned about exposure to RF energy there are things you can do to minimize exposure Obviously limiting the duration of your calls will reduce your exposure to RF energy In addition you can reduce RF exposure by operating your cellular modem efficiently by followin...

Page 58: ...ble the modem There are no user serviceable parts inside Do not expose the USR3500 to water rain or beverages It is not waterproof Do not abuse your USR3500 by dropping knocking or violently shaking it Rough handling can damage it Do not place the USR3500 alongside computer discs credit or travel cards or other magnetic media The information contained on discs or cards may be affected by the embed...

Page 59: ...ments referenced herein are provided by USRobotics Visit the USRobotics website at http www usr com for the latest documentation available 11 1 Firmware Documentation 3 AT Commands Interface Guide 4 Customer Release Notes for Firmware 7 52 A1 11 2 Expansion Card Documentation 5 Ethernet Expansion Card User Guide ...

Page 60: ...System DSR Data Set Ready DTE Data Terminal Equipment DTMF Dual Tone Multi Frequency DTR Data Terminal Ready EEPROM Electrically Erasable Programmable Read Only Memory EFR Enhanced Full Rate E GSM Extended GSM EMC ElectroMagnetic Compatibility EMI ElectroMagnetic Interference ESD ElectroStatic Discharges ETSI European Telecommunications Standards Institute FIT Series of connectors micro FIT FR Ful...

Page 61: ...r speaker sound pressure measurements PBCCH Packet Broadcast Control Channel PC Personal Computer PCL Power Control Level PDP Packet Data Protocol PIN Personal Identity Number PLMN Public Land Mobile Network PUK Personal Unblocking Key RF Radio Frequency RFI Radio Frequency Interference RI Ring Indicator RMS Root Mean Square RTS Request To Send RX Receive SIM Subscriber Identification Module SMA S...

Page 62: ...Rev 1 0 1 27 14 62 62 Reference Guide List of Abbreviations Abbreviation Definition TYP TYPical UMTS Universal Mobile Telecommunications System VSWR Voltage Standing Wave Ratio ...

Page 63: ...Rev 1 0 1 27 14 63 ...

Reviews:

No comments

Brands by name

Popular brands

Load more brands