La description

For matching HF transceivers of the R&S®M3SR Series 4100 to antennas used in submarine applications
Key Facts
  • The R&S®FK4150U matches rod, whip and wire antennas – as used in submarine applications – to the RF output of the 500 W transceivers of the R&S®M3SR Series 4100. It can handle up to 500 W CW and PEP at a 100% duty cycle with rod/whip antennas of 7 m to 10 m length. The R&S®FK4150U operates in the frequency range from 1.5 MHz to 30 MHz, where it performs an antenna impedance transformation into 50 ? in both the receive and transmit modes. Additionally it provides preselection in the receive mode.
  • 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 (R&S®SECOM-H)
    • 500 W CW and PEP with 7 m to 10 m rod/whip antennas
    • Low probability of intercept (LPI)
    • Maintenance-free, extremely rugged design
    • Continuous monitoring of operational status

Brief Description The R&S®FK4150U has an extremely fast setting time for silent channels and allows frequency hopping operation in line with SECOM-H. For protection against overvoltage as produced by lightning strokes to the antenna, the R&S®FK4150U output is provided with lightning protection Tuning functionality The R&S®FK4150U 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®FK4150U output is provided with lightning protection.''