For parallel operation of four two-way communication radios (transceivers) where highest possible decoupling (isolation) is necessary. Integrated SWR adjustment network for optimization of isolation in the frequency range of 380 - 410 MHz or 400 - 430 MHz. Via the adjustment network the effective SWR of the antenna can be optimized and consequently the isolation between the ports of the combiner clearly improved. High isolation obtainable: Up to 60 dB (Dependent on the SWR of the connected antenna). The adjustment of the SWR adjustment network takes place via built-in variable capacitors. Max. TETRA transmitter power 4 x 5 W. Also usable as equal power divider for max. 20 W. Very small ripple over the total frequency range.