R&S®M3SR Series4100 Software Defined Radios

At a glance

The R&S®M3SR Series4100 HF radios are innovative, versatile software defined radios (SDR) belonging to the popular R&S®M3SR radio family. They support frequency hopping and provide interoperability with the R&S®M3TR family of tactical radios in all HF operating modes. Possible applications include typical navy applications on board ships and on shore, civil air traffic control, embassy radio systems, and tactical applications.

Software defined radios save on logistics effort and reduce operating costs. In particular, the costs of warehousing spare parts and of maintenance are reduced tremendously. Having fewer internal hardware components also helps to significantly boost reliability compared to conventional radios.

Rohde & Schwarz has developed a state-of-the-art generation of communications systems designed to take HF radio to the next level. Shortwave communications are a resource that can be set up easily, offer extreme reliability, and are highly valued by security authorities and organizations as well as military users all over the world.

The R&S®M3SR Series4100 is a powerful radio platform that can be extended at any time, providing a safe, future-ready investment. Besides existing HF House waveforms, it will also support future waveforms that attain a suitable level of market acceptance and lead to international standards, requiring only a software update.

The radio already includes HF wideband functionality to establish long-range data links on a 24 kHz channel. The probability of obtaining permanent high data rates can be increased thanks to a well-tuned and embedded radio HF wideband concept prepared for 48 kHz channels.

Key facts

• Frequency range: 1.5 MHz to 30 MHz (transmission), 10 kHz to 30 MHz (reception)
• Power classes of 150 W, 500 W, 1000 W and standalone receiver
• LINK 11, LINK 22, LINK Y support
• Embedded secure voice and data capability
• Embedded HF wideband in line with MIL-STD-188-110C App. D, prepared for 48 kHz channels
• IP over air capability
• SIP-based remote voice operation

Benefits and key features

• IP for easy integration: R&S®IPoA radio transmission, R&S®IPoA protocol functionality, R&S®IPoA embedded services (Alarm messages, Short data messages, GPS reporting). IPoA with STANAG4538, Voice over IP, SIP and phone patch, Audio and remote control via IP, Phone patch Domain connect.
• Interoperable waveforms for multinational cooperation: ALE-2G (R&S®GS4101S), ALE-3G (STANAG4538, R&S®GS4155S, R&S®GS4165S), HF modem (R&S®GM4120S), HF modem (R&S®GM4122S), HF wideband modem (R&S®GM4123S).
• Secure and reliable communications: Secure digital voice/data (SDV, R&S®GM4121S), Last ditch voice, R&S®SECOM-H EPM (ECCM, R&S®GS3001S), Management of black keys for additional security.
• Unrivaled radio parameters: Collocation capability due to excellent receiver specifications, Selective level control for optimum transmit power (software option), Digitally tuned RF selection (hardware option), Digital IF and audio signal processing.
• Suitable for a wide range of situations: Three power classes and suitable line of accessories, HF broadband system.
• Easy operation: Clear status display, Preconfigured menus, Radio configuration only by authorized personnel.
• Low maintenance: Rugged design, suitable even for difficult environmental conditions, Powerful built-in test (BIT), Excellent reliability, Easy module exchange.

State-of-the-art secure radiocommunications.

IP for easy integration

IP is becoming generally accepted in all areas. The R&S®M3SR Series4100 offers IP support at both the air interface and the radio for receiving payload, control, and audio data.

R&S®IPoA radio transmission

The R&S®IPoA embedded radio protocol provides transparent IP functionality over the air. It can be used to set up communications systems that require transparent connection of IP networks over radio links. IP-based applications – such as situational awareness or message handling systems – are able to exchange their data over such radio links. The R&S®RNMS3000 network management system provides a wizard that creates an IPoA network structure automatically.

R&S®IPoA protocol functionality

The embedded R&S®IPoA protocol currently supports Internet protocol version 4 (IPv4). An internal address mapping function ensures that data is delivered to the correct recipient. An error detection mechanism prevents the protocol from delivering erroneous data to the connected network; additional error correction techniques (e.g., ARQ secured data) are implemented. IPoA is supported by ALE-3G (STANAG4538).

R&S®IPoA embedded services

Messages and text information can be transmitted directly from the radio HMI as well as from external sources.

• Short data messages: Short data messages (SDM) can be entered directly on the HMI keyboard.
• GPS reporting: GPS reporting allows the position of the own radio to be transmitted. The position of other radios can be shown on the HMI or transmitted to other applications. For example, the R&S®M3SR Series4100 radio in ALE3G can receive the position from R&S®M3TR radios in the field (blue force tracking).

IPoA with STANAG4538

Depending on the destination IP address, an advanced, highly robust link setup with ALE-3G is used to establish a link to the appropriate radio. Once the link has been set up, the actual payload is transmitted with the xDL data link protocols from STANAG4538 using error protection based on an integrated automatic repeat request (ARQ) procedure. In the implementation developed by Rohde & Schwarz, the different LDL and HDL protocols are selected automatically. An intelligent choice is made based on the data size and current channel quality, due to a mechanism that ensures that the optimum waveform is always selected for maximum data throughput under a very wide range of channel conditions. Data transmission is still possible in very poor channels with a signal-to-noise ratio (SNR) as low as -7 dB.

Diagram description: The diagram illustrates R&S®IPoA – transparent IP data transfer over air, showing two PCs connected via Ethernet to their respective radios, which communicate over an air interface using the R&S®IPoA waveform.

Voice over IP, SIP and phone patch

The R&S®M3SR Series 4100 radio family has an IP interface as standard, which can be used for remote control, configuration, and also transmission of digital voice from and to the radio. Thanks to this interface, the radio can be easily integrated into systems using one cable. Although other interfaces such as audio line interface or serial RS-232 are no longer required, they are still available.

Audio and remote control via IP: Since all relevant information is transmitted via Ethernet, the operator does not have to be at the same location as the R&S®M3SR Series4100 radio, provided an IP connection is available. The audio interface complies with the EUROCAE ED-137 standard, which allows the radio to be connected to an R&S®VCS-4G IP-based voice communications system, for example.

Phone patch: The phone patch is used to integrate the R&S®M3SR Series4100 radio into an SIP phone system. With ALE-3G, participants in the radio network can also be directly reached from a standard SIP phone. In addition, the radio network participants can directly communicate with other participants via the SIP phone system. If the secure digital voice (SDV) option is used, the connection is encrypted.

Domain connect: Local VoIP domains can be interconnected. For example, VoIP networks on board ships can be connected with a shore station. It is also possible to connect remote sites to the public switched telephone network.

Diagram description: The diagram illustrates easy integration into a VoIP network, showing SIP phones connected to SIP proxy/registrar servers, which communicate over an IP network with radio acting as SIP gateway radios.

Interoperable waveforms for multinational cooperation

Interoperable waveforms are required to enable cooperation among different nations. The most important waveforms for multinational cooperation are covered by the NATO HF House. The R&S®M3SR Series4100 family supports these waveforms.

NATO has defined several standards to ensure interoperability between modern HF transceivers. The HF House is a structured overview of different HF standards ratified by the NATO countries. The R&S®M3SR Series4100 family supports most of the waveforms mentioned in the HF House. These waveforms can easily be activated by an option key.

The network layer, link layer, and physical layer are embedded into the radio. This ensures high reliability and low maintenance costs since no additional hardware such as external modems is necessary. STANAG4538 allows the radio to be directly used as a static IP router. Rohde & Schwarz products also support STANAG5066 as an external application.

• ALE-2G, R&S®GS4101S: R&S®GS4101S is the ALE software for second-generation automatic link establishment systems. This software option provides support for the FED-STD-1045/1046/1049 and MIL-STD-188-141B App. A+B standards.
• ALE-3G, STANAG4538, R&S®GS4155S, R&S®GS4165S: ALE-3G (third generation automatic link establishment) offers significant benefits compared to ALE-2G, including considerably faster and more robust link setup, improved automatic channel selection algorithms, and embedded data link protocols. In addition, the automatic link maintenance (ALM) functionality is supported, allowing channels to be switched during a transmission without interrupting the link. The layer 2 protocols known as LDL (low-latency data link) and HDL (high-throughput data link) have the benefit of improved robustness at low S/N values compared to conventional protocols. The ALE-3G xDL protocols permit ARQ-secured, channel-adaptive data transmission that has been optimized for the special characteristics associated with shortwave channels. Mechanisms such as code combining and packet aggregation optimize the data throughput. Due to its robustness, the LDL protocol can even transmit reliably in channels with a negative signal-to-noise ratio.
• HF modem, R&S®GM4120S: The STANAG4539 HF modem provides transmission data rates from 75 bit/s to 12800 bit/s. It is the recommended modem for new NATO projects. It automatically adapts the receiving data rate and is used preferably with the STANAG5066 data protocol. STANAG4539 complies with MIL-STD-188-110B section 5.3 + App. C. The STANAG4539 implementation in the R&S®M3SR Series4100 performs significantly better than that of the competition and is robust in case of multipath propagation. STANAG4539 includes the STANAG4415 modem standard. The STANAG4285 HF modem is used primarily for broadcasting operation and for ARQ-secured data transmission, typically in conjunction with an external R&S®STANAG5066 application. The MIL-STD-188-110B App. F waveform uses independent sidebands for high-speed data transmission with up to 19200 bit/s. It consists of two identical MIL-STD-188-110B App. C modems to double the available data rate. STANAG4529 is used in naval applications; it requires only 1240 Hz bandwidth to achieve data rates from 75 bit/s to 1200 bit/s. STANAG4481 is a conventional FSK and PSK waveform for navy applications and data rates from 50 bit/s to 600 bit/s. STANAG5065 allows shore-to-ship broadcast reception using the low frequency band, in particular from 60 kHz to 160 kHz.
• HF modem, R&S®GM4122S: This option activates the STANAG4539 and STANAG4285 modems as described above.
• HF wideband modem, R&S®GM4123S: The embedded MIL-STD-188-110C App. D HF wideband modem provides data rates of up to 120 kbit/s in 24 kHz channels.

R&S®STANAG5066 is a communications solution for the robust and highly secure exchange of data using HF radio networks in line with STANAG5066. R&S®STANAG5066 uses the internal modems of R&S®M3SR Series4100 radio.

Diagram description: The diagram shows the HF House structure, a layered model representing interoperability standards for HF communications, including network, link, and physical layers with various NATO and MIL-STD specifications.

Secure and reliable communications

Due to the potentially worldwide propagation of an HF signal, it would be possible to eavesdrop on communications all over the world. In order to protect confidential transmissions effectively, the information must be encrypted.

Secure digital voice/data (SDV), R&S®GM4121S

SDV provides easy-to-use, versatile embedded encryption for fixed frequency connections as well as for connections established with ALE-3G. When using ALE-3G's synchronous link establishment process, users profit from the combination of information security (SDV) and ALE-3G's inherent mechanisms for improving transmission security (linking security). In ALE3G mode, the replay protection protects against spoofing attacks.

The Rohde & Schwarz RSCA crypto algorithm with a key length of up to 256 bits can be used for both voice and data connections. Either the voice information that has been digitized or the data, which is transmitted using LDL and HDL, is encrypted.

Last ditch voice

In order to ensure reliable connections in heavily disturbed channels, the radio must employ extremely robust transmission methods: A very good choice is the last ditch voice (LDV) technique from Rohde & Schwarz available for the R&S®M3SR Series4100 radio family. With LDV, the digitized voice message is first stored temporarily in the transmitting radio. Then, the stored LDV message is sent. Messages are transmitted as a type of voice mail, and not in realtime. Instead, they are passed on to the receiver without error through the LDL protocol's ARQ. This takes place fully automatically after the transmitter has triggered the process. The receiver reports the arrival of a new message and stores it. The message can be called up as often as desired. Transmission of LDV messages is always encrypted.

Diagram description: The diagrams show the stack structure for secure digital voice in fixed frequency, secure digital voice integrated in ALE-3G, and last ditch voice with ALE-3G, detailing components like digitized voice, COMSEC, internal modem, and LDL.

R&S®SECOM-H EPM (ECCM), R&S®GS3001S

R&S®SECOM-H is a Rohde & Schwarz proprietary HF frequency hopping radiocommunications waveform similar to STANAG4444. It is designed to operate in environments where a certain percentage of the hop set frequencies are blocked due to either intentional (i.e., jamming) or unintentional disturbances, as well as in environments with severe Doppler spread and/or multipath delay. In addition, it is based on modem waveforms that can be adapted to the specific characteristics of the HF channel and its propagation. R&S®SECOM-H provides digital voice services (low bit rate vocoder at 600 bit/s, 1200 bit/s, or 2400 bit/s, adjustable). To ensure reliable links even in severely degraded channels, free hop set search (FHS) is available. FHS is an algorithm for the automatic adaptation of hop sets based on channel evaluation. Radios in a point-to-point link will generate and use an advanced hop set containing only frequencies with proven good RF performance.

Management of black keys for additional security

The COMSEC/TRANSEC crypto algorithm was developed by Rohde & Schwarz. It supports key lengths up to 256 bits. Keys are generated using the R&S®CP3000 key management system. Keyset files are transmitted by the R&S®CP3000 to the R&S®RNMS3000 network management system using an additional asymmetric key protection key. This means that exclusively black keys are transported. Using the mission planner module, it is possible to set up secure R&S®SECOM-H radio networks consisting of the R&S®M3SR Series4100 and the R&S®M3TR. The R&S®SECOM-H radio configuration from the mission planner can be loaded into the radio via Ethernet or a fill device. For SDV applications, the keys can also be generated using other solutions. In this case, the key can be entered directly into the radio.

For network synchronization, GPS can be used as the network time source. GPS-based network time eliminates the need for manual net entry; all stations in the network remain synchronized as long as the GPS signal is received. Alternatively, the time can be exchanged over the air.

Diagram description: The diagram shows the process sequence for radio network management, starting from encryption key generation and black file creation, through the mission planner and remote device loader, to mission data distribution to radios via a fill device.

Unrivaled radio parameters

A high frequency (HF) radio channel is a transmission medium characterized by time variance, low signal-to-noise (S/N) ratios, Doppler effects, and multipath propagation. However, HF allows worldwide communications due to its unique propagation characteristics. To obtain usable signals, the operating frequencies and antennas, as well as radio parameters such as sensitivity, selectivity, and noise suppression, are essential.

Collocation capability due to excellent receiver specifications

Simultaneous operation of multiple radio lines on board ships is extremely challenging for the collocation capability of the radios due to the spatial proximity of the radios, which results in low antenna decoupling values. However, due to the outstanding specifications of the radios of the R&S®M3SR Series4100, such challenges are easily surmounted. For HF parameters such as second and third-order intercept, desensitization, and crossmodulation immunity, the R&S®M3SR Series4100 sets new standards. For example, even without preselection, the receiver provides third-order intercept (IP3) of typically > 40 dBm. This parameter is particularly important in cases where very low amplitude signals must be reliably detected in the simultaneous presence of high-power interference from nearby transmitter systems.

Selective level control for optimum transmit power (software option)

Mutual influences between adjacent transmitter lines would cause a traditional transmitter to reduce its output power, as the external power is taken into account as reflected power during VSWR calculation. The optional selective directional coupler available in the power amplifiers makes it possible to perform narrowband weighting of the transmit signal and the reflected antenna power. This means that the transmitter power control of the transmitter lines is not influenced during normal operation.

Digitally tuned RF selection (hardware option)

The optional HF pre/postselectors are steep-edged bandpass filters with a relative bandwidth of a few percent. They work at the transmitter and receiver ends and can be precisely set to the relevant operating frequencies. The HF pre/postselectors influence the performance of the radios in two ways. First, they reduce the TX phase noise to values better than typically −165 dBc (1 Hz). Second, they significantly increase the large-signal characteristics of the receive section, i.e., crossmodulation immunity, desensitization, and second and third-order intercept points. The HF pre/postselector in the R&S®M3SR Series4100 supports frequency hopping.

Digital IF and audio signal processing

The R&S®M3SR Series4100 combines the unmatched dynamic range of radios with analog mixers with the latest in digital IF and audio signal processing. The second IF frequency of 48 kHz is sampled, digitized, and processed using digital signal processors. This means that a wide range of IF bandwidths are available in all modes with high selectivity and optimized for voice and data communications. Digital signal processing also provides functions for noise suppression.

Image description: An image shows Rohde & Schwarz radios used on board the ADCF frigate of the Royal Netherlands Navy.

Suitable for a wide range of situations

The R&S®M3SR Series4100 is extremely flexible and can be optimally adapted to a wide range of diverse deployment conditions. The logistics effort is low because the modular concept allows the use of many identical system components.

Three power classes and suitable line of accessories

The output power required of HF transceivers is highly dependent on the particular application scenario. The radios of the R&S®M3SR Series4100 are available in power classes of 150 W, 500 W, and 1000 W. The R&S®M3SR Series4100 also includes a separate, standalone receiver. Without additional hardware, the R&S®M3SR Series4100 components can also be used to set up IP-based split-site systems. The product portfolio is rounded out by system components such as antenna tuning units (ATU) and dipole antennas from Rohde & Schwarz. For radio applications on ship and shore, broadband radio systems are also available. All components are designed to operate 24/7 within the rated temperature ranges at full output power.

HF broadband system

The HF broadband system is a flexible and modular multiline radio system for the HF frequency range. The applications range from navy ships to shore radio stations with up to 32 radio lines. The system offers the full range of R&S®M3SR Series4100 modulation modes and waveforms, from simple SSB operation and ALE to EPM (ECCM) radio line. Intelligent radio line management provides flexible and dynamic allocation of transmit power, from a few watts to several kilowatts, to support a variety of military missions.

Reference: See separate product brochure: R&S®M3SR Series4100 HF broadband system (PD 5214.1243.12).

Easy operation

Rohde & Schwarz has extensive experience in stationary radio systems, which is reflected in the operating concept of the R&S®M3SR Series4100 radios. The displays and control elements are arranged in a user-friendly manner and are easy to understand.

Clear status display

All required settings on the radio can be made using the R&S®GB4000C control unit. The R&S®GB4000C can be integrated into the radio or it can control the radio remotely. It can also be used to operate several R&S®M3SR Series4100 radio systems (only one at a time) in an IP network.

Preconfigured menus

The user interface for the R&S®M3SR radio family has clearly structured menus that are organized by function. Each operating mode is set using preconfigured menus (preset pages). The R&S®M3SR Series4100 can manage up to 100 preconfigured menus. The configuration is generated using the R&S®RNMS3000 network management system. The preset pages can then be loaded into the radio via LAN, RS-232, or a fill device.

Radio configuration only by authorized personnel

The areas that contain the settings for maintenance and configuration of the radio are password-protected. This ensures that only authorized personnel can carry out maintenance or in-depth configuration of the radio. The password can be set in the R&S®RNMS3000 network management system.

Diagram description: The image shows the R&S®GB4000C control unit with a user-oriented GUI for intuitive radio operation.

Low maintenance

The R&S®M3SR Series4100 radios were developed with low maintenance in mind. A variety of control and monitoring functions are available that provide the user with detailed status information about the radios. In addition, built-in test functions permit service and maintenance tasks to be carried out in a targeted manner. The radio systems can be remotely analyzed, eliminating the need for on-site service. Resistance to vibrations and a wide operating temperature range allow the systems to be used in diverse applications.

Rugged design, suitable even for difficult environmental conditions

The radios fulfill the requirements stipulated in the MIL-STD-810F military standard for operating temperature and mechanical influences such as vibration and shock. The corresponding standard for electromagnetic compatibility is MIL-STD-461E.

Powerful built-in test (BIT)

Multiple test procedures support users in checking that the radio functions properly and in identifying any malfunction down to module level. BIT results can be displayed locally and also queried from a remote site.

The following built-in tests are supported:

• Power-on BIT (PBIT)
• Continuous BIT (CBIT)
• Initiated BIT (IBIT)

The PBIT is a short self-test that is automatically performed each time the radio is powered on. The CBIT continuously polls the status messages from all radio modules during regular operation.

The IBIT allows a functional check of the complete system. Besides the base unit, it also checks external system components such as power amplifiers, power supplies, and any antenna tuning units that are connected. Failures and warnings are reported as plain text. The radio also shows the total operating time.

Excellent reliability

The R&S®M3SR Series4100 radios can operate in continuous-wave mode over a wide ambient temperature range from −20 °C to +55 °C. If the temperature exceeds the permissible range, the transmitter will automatically and gradually decrease its output power in order to maintain operation. If ambient conditions return to normal, the transmitter will revert to normal operation without requiring any manual intervention.

Easy module exchange

All RF modules are equipped with LEDs showing the module status. Modules can easily be exchanged without recalibrating the radio.

Diagram description: An image shows the interior of a radio.

IP-based radio communications using R&S®Postman III

Communications in civil and military missions have undergone important changes in recent years. While voice communications continue to play an important role, data communications are increasingly gaining in significance. The R&S®M3SR Series4100 radios and R&S®Postman III form a future-oriented HF radiocommunications solution for IP-based data transmission.

Diagram description: A diagram depicts a network scenario involving a Ministry of Foreign Affairs, a Naval Base, and an Embassy, all utilizing R&S®M3SR Series4100 radios and R&S®Postman III for IP-based communication.

Civil and military information exchange

R&S®Postman III contributes to the success of military and civil missions by enabling efficient data transmission in radio networks. Such missions can occur in naval and coast guard scenarios, border controls, disaster situations, or rescue operations. Organizations such as embassies and consulates frequently use wireline communications. In the event that this infrastructure fails, R&S®Postman III together with the R&S®M3SR Series4100 radios provides information exchange via shortwave. The combination of the STANAG5066 radio protocol and the ability to handle STANAG4539 and STANAG4285 waveforms converts R&S®Postman III and the R&S®M3SR Series4100 radios into a radiocommunications system for interoperable military missions.

Optimized for HF communications

R&S®Postman III has been specially optimized for communications via HF radio networks with low or variable data transmission rates. R&S®Postman III supports the R&S®M3SR Series4100 and can send IP data directly to the radio. Special mechanisms in R&S®Postman III and the R&S®M3SR Series4100 control the data flow to prevent loss of data.

Multiline capability for simultaneous communications with multiple radio network participants

An R&S®Postman III system allows the simultaneous use of multiple different communications lines. Especially in radiocommunications, this means that information can be exchanged simultaneously with multiple participants over different radio networks. R&S®Postman III automatically selects a line suitable for communicating with the remote participant.

Simple and comprehensive communications applications

The most important applications are e-mail, chat, fax, voice mail, and file transfer. Its position display capability makes R&S®Postman III a tool for generating situational awareness and performing blue force tracking. This is a crucial prerequisite for enabling coordinated action in both civil and military operations.

Diagram description: The diagram illustrates an example of data transmission in civil and military radio networks.

Split-site system

The R&S®M3SR Series4100 radio family supports IP-based split-site operation; no additional hardware is required.

Operation of high-power transmitters close to receivers at the same site, as occurs in broadcast and ship-to-shore (BRASS) applications, can cause interference to the receivers. In such cases, the transmitters and receivers are located at separate sites ("split-site operation"). In military environments too, it is common to install the transmitter and receiver systems as far as possible from the operational centers to help prevent precise position fixing of the operational centers and attacks against them.

Split-site operation with the R&S®M3SR Series4100

In the R&S®M3SR Series4100 family of software defined HF radios, the split-site controller functionality is entirely implemented in software and no special hardware is required. Standard radios from the R&S®M3SR Series4100 are used as the split-site transmitter and receiver. For data transfer between the split-site controller and the transmitter and receiver, the IP interface included in the radios is used. The figure shows a typical split-site system with these radios.

Diagram description: The diagram shows a typical split-site system with a Transmitter site and a Receiver site connected via an IP network. Each site contains multiple split-site transmitters/receivers. Operator consoles and switches are also depicted.

Split-site operation also supports complex waveforms such as automatic link establishment (ALE-2G/ALE-3G in accordance with STANAG4538) as well as modem waveforms (e.g., STANAG4285 and STANAG4539). Of course, classic HF modes such as SSB (J3E) or AM (A3E) can also be used.

Support also for secure links

The interfaces in the R&S®M3SR Series4100 radios for data and remote control data are unchanged. Crypto devices and – if red/black separation of the control signals is required – a trusted filter (firewall functionality) can be used. Encryption is possible using external, commercially available IP security solutions.

High availability and flexibility

Communications links today are increasingly based on the Internet protocol, which is progressively replacing the classic analog and digital telecommunications links. One of the objectives in the development of IP was to enable the transport of data packets via alternative routes in case connections fail. With appropriate network planning, high availability can be ensured for the entire system.

The ability to assign a split-site controller dynamically to a certain transmitter and receiver offers great flexibility in configuring the overall system. This makes it possible to select the transmitters and receivers with the sites and antennas that are the best match for the current task. Usage of costly transmit antenna switches can be kept to a minimum by appropriate system design. Even if individual split-site components fail, the remaining components can be reallocated dynamically, which helps to improve overall availability.

Lower maintenance and logistics costs

Generally, each base unit in the R&S®M3SR Series4100 radio family (R&S®GX4100, R&S®EK4100, or R&S®XK4115) can be configured as a split-site controller by activating the R&S®GS4156S software option. The R&S®M3SR Series4100 radios used in the transmitter and receiver systems do not require any special hardware extensions for split-site operation. The table shows an example illustrating the benefits of configuration for split-site operation: A split-site radio line can be implemented using three identical R&S®GX4100 receivers/exciters. This is a significant benefit for users, simplifies logistics, and saves on spare units.

Diagram description: An image displays the user interface for split-site configuration.

Table description: The table outlines a possible hardware configuration for split-site operation with R&S®M3SR Series4100 HF radios, detailing components like R&S®GX4100 receiver/exciter, R&S®VK4190 power amplifier, R&S®IN4190 power supply, and R&S®IN4000A power supply.

R&S®RNMS3000 radio network management system

Utilization planning, radio network configuration, and data distribution

Increased significance for a radio network management system

In today's world, information exchange via voice and data is indispensable for military forces to fulfill their increasing mission requirements. Handling all these communications demands with their complex waveforms requires an extended network management system. By offering R&S®RNMS3000, Rohde & Schwarz provides such a radio network management system. It enables military leaders to turn their Rohde & Schwarz combat radio equipment into a robustly networked communications system based on mission demand and on complex hierarchical structures, especially in joint or combined missions. In the past, many parameters had to be adjusted on the radios, which required highly skilled users. In future, the configuration complexity will be done during the preparative configuration of a management system.

R&S®RNMS3000 – the convenient way to empower the capabilities of Rohde & Schwarz radios in networks

The R&S®RNMS3000 software supports centralized network management, where one central organizational unit performs the complete mission planning, as well as decentralized management, where the various configuration steps are accomplished on different military hierarchical levels. The R&S®RNMS3000 software suite, consisting of the mission planner, the remote device loader, and the remote distributor, offers the following functions:

• Management of security keys
• Frequency assignments
• Establishment of logical nets
• Distribution of mission files

Diagram description: The diagram illustrates the process sequence for radio network management, including encryption key generation, black file creation, mission planner, remote device loader, frequency assignment, security key management, radiocommunications plan transfer, logical net establishment, remote distributor, and mission data distribution to radios via a fill device.

The objective is to provide mission-tailored and secured radiocommunications networks. Especially the R&S®RNMS3000 capability to manage NATO-specific waveforms, as well as general HF House waveforms and Rohde & Schwarz proprietary waveforms, underlines its broad range of applications.

Highlights

• Support of all Rohde & Schwarz radios and all frequencies
• Support of voice and data services
• Network planning, mission file generation and distribution with one software suite
• Target-oriented software guidance with wizards

Key features

• Mission planner: mission-tailored network planning, Frequency assignment, Hop set generation and management, Security key management, Efficient mission planning.
• Remote device loader: mission-optimized radio communications plan transfer, Secure file transfer, Effective hardware programming.
• Remote distributor: extended mission data distribution, File distribution over existing IP networks, Event log and status control.

Effective mission planning

The mission planner software allows mission-optimized and time-critical software use. The program provides target-oriented software navigation via wizards to allow operator mission planning with a focus on the essential parameters. In case of a configuration error, R&S®RNMS3000 displays a fault message including advice to support the error search process. The created mission file and configuration progress are saved automatically in a database to avoid losing critical mission data due to a hardware failure.

R&S®GP4100A fill device

The R&S®GP4100A fill device needs no power supply since it is supplied by either the connected PC or the radio. The fill device status is indicated by LEDs (power on, reading, writing, connected, error). After setting up a network configuration with R&S®RNMS3000, the generated configuration files are stored in the fill device via the USB interface of the PC running R&S®RNMS3000 and the remote data loader (RDL). At the radio site, operator action is limited to choosing the appropriate radio global address (RGA) in the radio HMI to assign a radio to its preconfigured configuration. All files transferred from and to the fill device are encrypted before loading. Sensitive data such as keys is therefore stored in the fill device in black form only.

Diagram description: An image shows the R&S®GP4100A fill device for R&S®M3SR Series4100 radios.

System overview

Logistical structure

The logistical structure of the R&S®M3SR Series4100 is based on radio models that are available for the R&S®EK4100 receiver, the R&S®GX4100 receiver/exciter, and the R&S®XK4115 150 W transceiver. Each radio model consists of:

• Hardware base unit
• Radio software
• Software and hardware options

The base units, known as R&S®MR4100x, are all ruggedized with a splashproof IP32 front panel. The radio software for these base units can be ordered in the form of "A" software (with no export restrictions) or "D" software (requiring an export license). Depending on customer requirements, individual hardware and software options can be added to the system (see product overview). The final type designation and the order number for a custom-configured R&S®EK4100A/R&S®EK4100D or R&S®XK4115A/R&S®XK4115D are order-specific. This makes it possible to clearly identify any customized unit with all of its options using a unique order number.

Diagram description: The diagram illustrates the R&S®M3SR Series4100 power classes, showing the R&S®EK4100A/D receiver, R&S®XK4115A/D 150 W transceiver, 500 W transceiver systems, and 1000 W transceiver systems, along with their respective components like the R&S®GX4100A/D receiver/exciter, R&S®VK4150/R&S®VK4190 power amplifier, and R&S®IN4000A/R&S®IN4150/R&S®IN4190 power supply.

R&S®EK4100A/ R&S®EK4100D VLF-HF receiver

The R&S®EK4100A/R&S®EK4100D VLF-HF receiver provides an internal AC power supply for operation on 110 V to 230 V AC voltage. Alternatively, it can be operated on 28 V DC voltage.

Key features

• Frequency and channel scanning
• IP3 > 40 dBm
• Latest DSP technology
• 10 kHz to 30 kHz reception
• High sensitivity
• Full remote control via IP or RS-232
• Audio via IP or analog
• Modular concept

Diagram description: The diagram shows the front view of the R&S®EK4100A/D VLF-HF receiver with its control panel, indicators (Power on/off, Erase), and connectors (Fill device, Headset interface). The rear view shows connectors for Mains, Reference frequency, GPS antenna, DC input, Audio/PTT interface, Data interface, and RS-232 LAN remote control.

R&S®XK4115A/ R&S®XK4115D 150 W transceiver

The R&S®XK4115 has a built-in 150 W power amplifier. The transceiver can be operated on 28 V DC voltage or, with an external R&S®IN4000A power supply, on 230 V AC voltage.

In addition to the receive characteristics it shares with the R&S®EK4100A/R&S®EK4100D, the transceiver offers the following noteworthy features: 24/7 operation (TX at +55°C), Link operation ready, Frequency hopping capability.

R&S®IN4000A external power supply

The R&S®IN4000A features a wide AC input range that provides robust protection against AC voltage fluctuations. A sophisticated voltage regulation concept ensures highly stable DC output voltage regardless of load fluctuations and ambient temperature variations.

Diagram description: The diagram shows the R&S®XK4115A/D transceiver with the R&S®IN4000A external power supply. The front view includes the control panel, fill device interface, headset connector, and indicators (Power on/off, Erase). The rear view shows connectors for HF output, optical interface to antenna tuning unit (ATU), antenna interface (RX), GPS antenna, DC input, Mains, Audio/PTT interface, Reference frequency input, DC output, Data interface, and RS-232 LAN remote control.

500 W/1000 W transceiver systems

A 500 W or 1000 W transceiver system consists of the following components:

• R&S®GX4100A/R&S®GX4100D receiver/exciter
• R&S®VK4150/R&S®VK4190 power amplifier
• R&S®IN4150/R&S®IN4190 power supply

To cover large distances, transceiver systems with an output power of 500 W and 1000 W are available. These solutions provide exceptionally high radio link availability – even under moderate propagation conditions.

R&S®GX4100A/R&S®GX4100D receiver/exciter

The R&S®GX4100A/R&S®GX4100D controls the R&S®VK4150/R&S®VK4190. They provide higher signal-to-noise ratios as required when transmitting at high data rates, for applications in worldwide embassy radio systems, in civil ATC systems, or in the military. It also goes without saying that these systems offer frequency hopping capability.

Diagram description: The diagram shows the front view of the R&S®GX4100A/D receiver/exciter with its control panel, fill device, headset interface connector, and indicators (Power on/off, Erase). The rear view shows connectors for Interface (TX) to power amplifier, Antenna interface (RX), GPS antenna, DC input, Reference frequency input, Audio/PTT interface, Data interface, RS-232 remote control, and Optical interface to power amplifier and LAN.

R&S®VK4150/R&S®VK4190 power amplifier

The digitally controlled R&S®VK4150/R&S®VK4190 power amplifier is available as a standard model and a special model with built-in receiver input protection. The receiver input protection protects the receiver input from destruction through HF interference on the antenna. The built-in receiver input protection should be selected whenever undisturbed reception of wanted signals is required under extreme conditions.

• 24/7 operation at full output power (100 % duty cycle) even at +55 °C
• Rugged design, high MTBF
• Software option for selective level control available

Diagram description: The diagram shows the front and rear view of the R&S®VK4150/R&S®VK4190 power amplifier, with connectors for Optical interface to exciter, Control interface to power supply, DC input, Control interface to ATU, DC output to exciter, RF input power, and RF output power.

R&S®IN4150/R&S®IN4190 standard power supply

The R&S®IN4150/R&S®IN4190 standard power supply is controlled by the R&S®VK4150/R&S®VK4190 power amplifier. The control connection ensures that the power amplifier and the power supply always operate in the most efficient mode possible.

• Different models available for all conventional electrical networks
• High efficiency (up to 90 %)
• State-of-the-art power factor correction (> 95 %)
• Automatic switchover between AC and battery supply in case of power failure

Diagram description: The diagram shows the front and rear view of the R&S®IN4150/R&S®IN4190 power supply, with indicators (Main circuit breaker, Power on/off) and connectors for Control interface to RF power amplifier, Mains, and Backup battery DC output.

Antenna tuning units

All Rohde & Schwarz antenna tuning units (ATU) operate in the frequency range from 1.5 MHz to 30 MHz, where an antenna impedance transformation into 50 Ω in both the receive and transmit modes is performed. Additionally, Rohde & Schwarz ATUs provide preselection in the receive mode.

Key features

• Silent tuning functionality: Offers silent tuning over the entire frequency range from 1.5 MHz to 30 MHz. The advantage for the user is low probability of intercept (LPI), since Rohde & Schwarz ATU frequency setting is performed very quickly and without any emission of RF power. Before this feature can be used, the Rohde & Schwarz ATUs must be connected to the antenna to "learn" its characteristic. Learning takes place in a user-defined frequency range within the HF band (1.5 MHz to 30 MHz).
• Maintenance-free, rugged design: The rugged design of the Rohde & Schwarz ATUs allows them to be operated 24 hours a day.
• BITE: The Rohde & Schwarz ATUs are included in the continuous monitoring of the entire system so that deviations from the normal operating status are displayed on the control unit.
• EMC and overvoltage protection: All circuit boards are equipped with EMC filters. For protection against overvoltage as produced by lightning strikes to the antenna, the Rohde & Schwarz ATU's output is provided with lightning protection. All antenna tuning units are tested to withstand arcs of 10 kV/10 kA.

ATU selection guide

Diagram description: The diagram shows typical three-dimensional radiation patterns above perfectly conducting ground at 1.5 MHz, 5 MHz, 15 MHz, and 20 MHz.

Dipoles and postselector

Software and hardware options

Description of software options

¹) D version of radio software: export license required
²) A version of radio software: without export restrictions

Description of hardware options

Overview of hardware and software options

Product overview

The radio systems described are hardware and software configurable. The system delivered has the configuration as confirmed in the order. Your local Rohde & Schwarz expert will help you determine the optimum solution for your requirements. To find your nearest Rohde & Schwarz representative, visit www.sales.rohde-schwarz.com

Service that adds value

• Worldwide
• Local and personalized
• Customized and flexible
• Uncompromising quality
• Long-term dependability

Rohde & Schwarz

The Rohde & Schwarz electronics group offers innovative solutions in the following business fields: test and measurement, broadcast and media, secure communications, cybersecurity, monitoring and network testing. Founded more than 80 years ago, the independent company which is headquartered in Munich, Germany, has an extensive sales and service network with locations in more than 70 countries. www.rohde-schwarz.com

Sustainable product design

• Environmental compatibility and eco-footprint
• Energy efficiency and low emissions
• Longevity and optimized total cost of ownership

Certified Quality Management ISO9001

Certified Quality Management AQAP-2110

Certified Environmental Management ISO14001

Regional contact

• Europe, Africa, Middle East | +4989412912345 customersupport@rohde-schwarz.com
• North America | 1888TESTRSA (18888378772) customer.support@rsa.rohde-schwarz.com
• Latin America | +14109107988 customersupport.la@rohde-schwarz.com
• Asia Pacific | +6565130488 customersupport.asia@rohde-schwarz.com
• China | +868008108228 | +864006505896 customersupport.china@rohde-schwarz.com

R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG. Trade names are trademarks of the owners. PD 5213.9557.12 | Version 05.01 | December 2018 (ch)