Adjacent Channel Combination
COM-TECH has exploited the Adjacent Channel combination, thanks to innovative and proprietary techniques and innovations:

Adjacent Channel combination is possible on most Balanced and Manifold COM-TECH Combiners:

  • 6 and 7-Pole low power Balanced Combiners (DB Series)
  • 6 and 8-Pole medium and high power Balanced Combiners (DM, DF Series)
  • 5-Pole Manifold Combiners (MX Series)


  • Adjacent Channel combination involves an increased dissipation for the Filters reflecting the adjacent channel; for these modules, Narrowband power ratings must be consequently reduced by up to 40%
  • Adjacent Channels combination can be implemented independently of the required Mask (e.g.: Critical or Non-Critical): there is no strictly need of 8-Pole Filters to combine adjacent channels

Mask Combiner
This configuration refer to a Combiner which makes use of Bandpass Mask Filters (6, 7, and 8-Pole) , and consequently Filters in the Transmitters are either not present or removed.

This approach has several advantages:

  • Highest system efficiency
  • Transmitters are completely frequency-agile (no built-in Filters)
  • Adjacent Channel combination
  • Constant impedance provides best Transmitter working conditions (Balanced Combiners)

No-Mask Combiner
This configuration refer to a Combiner which makes use of Bandpass No-Mask Filters (3 and 4-Pole) while Mask Filters are built-in the Transmitters.

Though not allowing Adjacent Channel combination, this approach can be adopted with existing Transmitters already having their own built-in filters:

  • Suitable to adapt to existing site configurations
  • Adjacent Channel combination not possible