R&S®FK4190M HF Antenna Tuning Unit

For matching HF transceivers of the R&S®M3SR Series 4100 to antennas used in naval applications

  • Overview

Key Facts

The R&S®FK4190M matches rod, whip and wire antennas, as they are used in naval applications, to the RF output of the 500 W and 1000 W transceivers of R&S®M3SR Series 4100. It can handle up to 500 W CW and PEP with rod/whip antennas of 7 m to 11 m length and up to 1000 W with 12 m rod antennas.

Brief Description

  • Tuning functionality
  • Repeated tuning
  • BITE
  • EMC and overvoltage protection

Key Facts

  • The R&S®FK4190M matches rod, whip and wire antennas, as they are used in naval applications, to the RF output of the 500 W and 1000 W transceivers of R&S®M3SR Series 4100.

    It can handle up to 500 W CW and PEP with rod/whip antennas of 7 m to 11 m length and up to 1000 W with 12 m rod antennas. The R&S®FK4190M operates in the frequency range from 1.5 MHz to 30 MHz, where it performs an antenna impedance transformation into 50 Ω in both the receive and transmit modes. Additionally it provides preselection in the receive mode.

    The R&S®FK4190M has an extremely fast setting time for silent channels and allows frequency hopping operation in line with R&S®SECOM-H.

    For protection against overvoltage as produced by lightning strokes to the antenna, the R&S®FK4190M output is provided with lightning protection

  • Main features
    • Silent tuning over the entire frequency range from 1.5 MHz to 30 MHz
    • Tuning of rod, whip and wire antennas
    • Frequency hopping capability (SECOM-H)
    • 500 W CW and PEP at 100% duty cycle
    • 1000 W CW and PEP (12 m rod antennas only)
    • Low probability of intercept (LPI)
    • Maintenance-free, rugged design
    • Continuous monitoring of operational status

Brief Description

Tuning functionality

The R&S®FK4190M offers a 'silent tuning feature' over the entire frequency range from 1.5 MHz to 30 MHz. Before this feature can be used, the ATU must be connected to the antenna to "learn" its characteristic. Learning takes place in an user-defined frequency range in the HF band (1.5 MHz to 30 MHz). The ATU "learns" the antenna characteristic by obtaining tuning data at certain fixed frequencies in the HF frequency band. Once the tuning data for these frequencies is known and stored, the typical silent setting time of the ATU is less than 5 ms.

The advantage for the user is low probability of intercept (LPI), since ATU frequency setting is performed very quickly and without any emission of RF power.

Repeated tuning

A change in environmental conditions may slightly alter the actual antenna tuning data as compared to the stored data.

The quality of antenna matching is therefore checked during operation by means of an integrated VSWR measuring device. If the required VSWR (<1.5:1) is not attained, the ATU can be retuned (nonsilent mode) in less than typ. 100 ms.

BITE

The ATU is 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 strokes to the antenna, the R&S®FK4190M output is provided with lightning protection.

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