R&S®FK855U HF Antenna Tuning Unit
For matching HF transceivers to antennas used in submarine applications
- Tuning range 1.5 MHz to 30 MHz
- Fully automatic tuning
- 400 W CW and PEP at 100 % duty cycle
- 1000 W CW and PEP with restrictions
- Tuning of all rod, whip and broadband antennas used in submarine applications
- Low probability of intercept (LPI)
- Extremely short setting time
- Silent tuning over the entire fequency range from 1.5 MHz to 30 MHz
- Maintenance-free
- MTBF 12 000 h (calculated)
- Continuous monitoring of operational status
- Extremely rugged design
The R&S® FK855U matches rod and whip antennas, as they are used in submarine applications, to the RF output of the Transceivers R&S® XK2500/ R&S® XK2900.
It can handle power up to 400 W CW and PEP at a 100 % duty cycle and up to 1000 W with restrictions. The R&S® FK855U 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 mode. Additionally, it provides preselection in the receive mode.
Owing to the silent tuning features of the Transceivers R&S® XK2500 andR&S® XK2900, low probability of intercept (LPI) is enhanced.
Design
The rugged design of the R&S® FK855U allows it to be operated continuously 24 hours a day especially on board of submarines, installed in a submarine communication mast.
Bite
The ATU is included in the continuous monitoring of the 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 ECM filters. For protection against overvoltage as produced by lightning strokes to the antenna, the R&S® FK855U output is provided with lightning protection.
