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| Transmitter combiners |
AMPL offers different types of Transmitter Combiners. They are 1) Cavity Ferrite Type and 2) Hybrid Ferrite Type.
1) Cavity Ferrite Type:
The most popular combiner type is the cavity ferrite combiner, which is usually comprised of band pass cavities with a ferrite isolator in each channel for transmitter intermodulation protection. Increased amounts of isolation can be provided by using dual or triple stage isolators as required. Cavity selectivity can be enhanced by using three-quarter wave or larger diameter cans.
Advantages of the cavity ferrite type combiner are high isolation and low insertion loss for moderately close channel spacing. In addition, these moderate cost units are easily field expandable making them popular in trunking and cellular systems.
2) Hybrid Ferrite Type:
If the channel spacings are too close for the cavity response curve to provide isolation, eliminating the use of all-cavity or cavity ferrite combiners, the Hybrid Ferrite type combiner is used. A hybrid coupler is the actual combining device, used in conjunction with an isolator and second harmonic filter in each channel. These combiners have no minimum separation specifications and can even be used to combine two transmitters operating on the same frequency.
A combiner of this type provides very high isolation between transmitters and also very good isolation between transmitters and antenna. Other advantages are compact size and easy expandability.
AMPL offers Transmitter cavity low loss combiner. These combiners couple several transmitters into one antenna to reduce the direct costs of multiple antenna installations. Each uses a single, dual or triple isolator junctioned with a precisely tuned copper cavity.
The Combiner is provided with a 60watt load termination on the output load port of each isolator for maximum system protection from excessive reflected power in the event of transmission line failures at the output of combiner.
Salient Features:
Allows combining of two or Maximises use of tower more transmitters space,
reduces cost.
Low Loss Maximises system performance
Temperature compensated Ensures consistent performance across temperature and power ranges
High Return Loss / Low V.S.W.R.
Reliable, Compact and rugged design
Wide bandwidth
Excellent temperature stability
Low, Medium, High Power applications
Variety of connectors (Customer Choice)
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