MA-250 Antenna Multicoupler

The MA-250 Antenna Multicoupler allows two 50W VHF transceivers to share the same antenna, reducing the number of required antennas in radio communication systems.
The MA-250 is based on wideband VHF coupling rather than in frequency filtering, so the only restriction concerning frequency allocation is a minimum of 10% frequency deviation for a minimum cosite rejection in the power amplifiers.
Whenever antennas with VSWR 2:1 or higher are used, a MA-250A variant should be used for power amplifiers safety: the MA-250A has an increased attenuation to the antenna but also an increased isolation between the two transceivers.
An emergency direct connection is provided for one transmitter/receiver, bypassing all multicoupler circuitry.