These units are essentially used to alleviate crowding transmission sites with antennae and related installation problems.
TX combiners simplify installation by using a single cable and antenna allowing for better isolation among various transmitters and assures a filter against modulation interference. At multiple repeater sites, the choice of the proper TX combiner could substantially improve the radio performance.
There are three different types of combiners with advantages and draw-backs depending on the specific application. These are:
1) Cavity Type, assembled with resonant band pass cavities. The major advantages for this type of TX combiner is low cost and low insertion loss. The disadvantages are their large size and limited channel capacity.
2) Cavity/Ferrite Type, which usually comprise band pass cavities with ferrite isolator. Dual or triple stage isolators are used to provide additional isolation. The advantages include higher isolation and low insertion loss for moderate channel spacing. The disadvantage is an inadequate insertion loss protection in very close channel spacing.
3) Hybrid Ferrite Type combiners are used when channel spacing is very close between transmitters. The advantages are excellent isolation between transmitter and antenna. The disadvantages are higher insertion loss and relatively high cost.
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