List of products by brand HOPF

Our innovative "Made-in-Germany"-products are used by well-known companies across the globe to implement highly-precise signals for the synchronization and time stamping of industrial applications, computer networks, industrial networks or to successfully run complex industrial projects.

hopf Elektronik GmbH was founded in 1972 and is your reliable and competent partner in the field of time synchronization.
For more than 50 years hopf Elektronik GmbH has been developing, manufacturing and selling highly-precise time reference systems.
Our in-house development, production and sales as well as our lean organization and short lines of communication guarantee the consistent high quality of our products.
Our innovative "Made-in-Germany"-products are used by well-known companies across the globe to implement highly-precise signals for the synchronization and time stamping of industrial applications, computer networks, industrial networks or to successfully run complex industrial projects.
By constant communication with our customers, continuous cooperation and support in all matters and through a network of like-minded partners, we remain at the cutting edge of customer needs worldwide.
Whether we are talking about the Metro in Guangzhou or Bangkok or the pipeline in Ingolstadt, whether our business partner is ABB, Siemens, Honeywell or YOU:
Our customers are our partners - whatever we can do for them - we do!And that's quite a lot after more than 50 years.



hopf's modern production plants, precise measuring instruments, testing facilities and test equipment are the basis for the high quality of our products. Our own development from product design to marketing and direct sales allows us to guarantee a complete process flow and to meet the high quality requirements and standards of our customers. Manufacturing processes, commissioning and a 100% final testing of all our products are in accordance with the relevant regulations and standards. Customers' needs and satisfaction are our yardsticks and always contribute to the revision and optimization of our production processes. Competent customer consulting from the first inquiry to after-sales service and support after successful commissioning is the hopf company's basic objective.
We are committed to the quality requirements of our customers and the label "Made in Germany", marked on our products.


Our products are manufactured at our production facility in Lüdenscheid, located in the idyllic "Sauerland" region. Using latest technologies and manufacturing processes enables us to guarantee continuous improvement and optimization of the company environmental protection. Our company's objective is to offer our customers the very best technical solution for their applications while maintaining economic feasibility. Since the company's foundation, more than 2.75 million hopf systems have been in worldwide use.

The primary objective is to foster and strengthen the responsibility and environmental consciousness among our employees, the continuous monitoring and optimization of the material and energy input and the careful design and planning of all workplaces and production processes with respect to the relevant environmental elements.


 Safety and Health, Human Rights Policy

In close cooperation with the occupational medical support provided by specialists and safety representatives of the Institute for Occupational Medicine as well as trained first-aid staff at hopf ensure the corporate work and health safety with consideration to labor aspects and laws. Precautions against accidents and relevant safety aspects in the workplace are subject to constant review and adaption by qualified personnel. The production in our modern production facility considering work- and safety-relevant criteria related to the workplace enables the implementation of health and safety aspects.

Every single employee of our company plays a key role to hopf's success. We respect every individual's dignity and rights and the cultural, ethical and socio-political diversity of nations and cultures with whom we or our agents maintain business relationships.

There are 25 products.

DCF77 4417 / 4418 / 4420 / 4436 / 4437 antennas are all German hopf antennas with active directional capability and an electrical design. Ferrite antennas are used for long wave range frequencies to keep the antennas small. The oscillating circuit in the antenna, which is made of a wire ferrite rod and various capacitors, is set up on 77.5 kHz. DCF77 is a standard for transmitting time (hours, minutes and seconds) and date to clocks and timing devices, and it is transmitted to devices with high accuracy by radio (local transmitter).

German Hopf 4491 Small GPS Antenna is the integration of a high performance GPS antenna and an advanced low noise amplifier in a very small size (very compact / fully waterproof housing). When connected to a GPS receiver, it boosts the antenna power with a voltage of 5V, provides excellent signal amplification, and an out-of-band filter. The small antenna is suitable for all kinds of German Hopf time servers. It has the ability to remove environmental noise very well.

System 6844 (RC) is a semi-modular with integrated GPS receiver. It is designed in different sizes from 1 to 3 units. It is designed to be installed inside the rack. This time server has a wide screen and keyboard. It has two independent serial interfaces COM0/COM1. It has also a built-in IRIG-B protocol. Extensive development capabilities such as NTP modules for network ports are among the capabilities of this semi-modular time server. It is also possible to develop and increase ports and protocols on this time server based on the customer\'s request.

System 6844(RC)-SUB is a semi-modular SUB-Master system. It is produced in 1 to 3 units based on customer requests. You can benefit from hopf Master/Slave Strin signals, PPS pulse, DCF77 pulse (1Hz), IRIG-B and NTP/SNTP to synchronize the 6844(RC)-SUB system. The device has a screen and a keyboard. By running up to two (2) NTP LAN Board 7273 (RC) or NTP LAN Board(s) 7274 (RC), the 6844SUB system becomes a highly accurate NTP Stratum 1 time server for synchronizing computers and industrial networks.

The system 6855 is a DCF77-based time server system. This means that the system is synchronized to local time (standard time with ST/WT conversion, if needed). The 6855 Time Server System is available in a 3U version as well as a 1U Slim Line version. Both offer extensive modularity that allows customized solutions to be realized with the 6855 DCF77 system. The system can be developed using functional boards, added by the customer. So, its performance can be easily upgraded on the site at low cost. Performance panels can also be replaced directly on site.

The 6890 time servers are fully special network time server systems for NTP (Network Time Protocol). They support Global Navigation Satellite Systems (GNSS) GPS, Galileo, GLONASS and BeiDou for accurate and reliable time synchronization at very competitive prices. The 6890 series network time server systems have a compact design with a small enclosure for DIN rail installation. With an integrated 72-channel GNSS receiver for GPS, Galileo, GLONASS and BeiDou, reliable satellite time signal evaluation ensures the quality of received frequencies even in challenging and noisy installation conditions. This small and very high-quality time server is one of the most competitive time servers in the world with POE and 24V DC power supply and extensive protocols and internal firewall. 

The 8100 product series are modular time reference systems supporting the Global Navigation Satellite Systems (GNSS) GPS, Galileo, GLONASS, and BeiDou for precise and reliable time synchronization at highly competitive pricing which is especially well suited for critical infrastructure applications The 8100 product series time reference systems have been designed for synchrophasor and substation applications with high requirements in terms of flexibility, availability and the support of a wide variety of time synchronization standards. The modular system design features easy spare part management and minimum mean time to repair (MTTR) with all parts / extension boards supporting hot-plug capability. 

If you want to install only one GPS antenna to work with multiple GPS receivers (for structural or other reasons), you can connect up to 8 GPS receivers with a common GPS antenna by using the Active GPS Antenna Splitter 4449.  This is often used in performing device tests in laboratories or test stations. Active GPS antenna splitter 4449 has 8 outputs and a GPS signal amplifier for time server technologies. The power of this splitter is provided by two ways, either by devices connected to the time server or by an external power source.

The antenna is placed in a round and waterproof plastic housing. The body cover is arched, to prevent any rainwater, snow or other impurities penetrating inside the antenna. The mechanical structure is made of solid, anodized, and cast aluminum. It is designed to withstand strong winds. In addition, special thermal elements are used inside it, for automatic melting of ice and snow. The active antenna gets its amplification power through the coaxial cable and the time server itself. It has the ability to amplify weak signals, and remove unwanted noise. It is one of the best antennas for time servers in the world.

Germany Hopf 4496 product series are lightening arrester devices for coaxial cable and high frequency antennas of hopf time servers, which support Global Navigation Satellite Systems (GNSS), GPS, Galileo, GLONASS and BeiDou, to provide a synchronized, accurate, and reliable time. The 4496 product series protectors are designed to protect GNSS time servers. They support Global Navigation Satellite Systems (GNSS) GPS, Galileo, GLONASS and BeiDou against lightning, and unwanted events. They form the first level of protection for sensitive equipment and can be divided multiple times. The German lightning arrester 4496 is waterproof and equipped with replaceable gas discharge tubes (GDT).

If you choose to install only one GPS antenna (for structural or other reasons), you can set up two GPS receivers with a common GPS antenna using the 4443 Passive GPS Antenna Splitter. The time server system supplies the voltage of the Power Splitter 4443 through the GPS antenna cable of hopf GPS receivers. No external power supply is required to operate the program. If at least one of the connected GPS receivers provides the correct supply voltage through the antenna cable, and all connected components work in accordance with the main GPS L1 antenna signal, the GPS 4443 antenna splitter can be used together with another time server correctly.

Din rail time server module DIN 8024GPS for mounting on the electrical DIN rail is the perfect flexible solution for time synchronization via GPS.  This time server has a wide development capability based on customer needs in various projects. Hence, the necessary options are installed and programmed on the buyer\'s request at the time of production. Among others, we can point out to the IRIG-B and DCF77 modules, cyclic pulses, optical fiber outputs, etc. It is a small and very flexible time server for various users. Customers choose the time server when they must use a modular system. However, they will need a certain number of modular system protocols forever.