The MFJ-916B duplexer is a series of inductance coils and capacitors that acts as a band-pass filter. Your MFJ duplexer can be used two different ways. The duplexer combines the output of the HF/VHF transceiver and the output of the UHF transceiver so that both transceivers can be connected to the same antenna. The duplexer can also be used to separate HF/VHF transmissions from UHF transmissions so that one transceiver can be connected to two antennas. The MFJ-916B is designed for indoor use. If you use the MFJ-916B outdoors, it should only be used for short periods of time under good weather conditions. Do not use the duplexer outdoors when there is any kind of precipitation.
Specifications:
Low Pass Frequency Coverage:1.6-225 MHz
High Pass Frequency Coverage:350-540 MHz
Low Pass Loss:0.2 dB
High Pass Loss:0.2 dB
Low Pass PEP:200 watts
High Pass PEP:200 watts
Isolation:55 dB
Mix Connector:UHF female, SO-239
Low Pass Port Connector Type:UHF female, SO-239
High Pass Port Connector Type:UHF female, SO-239