Service Manual

GSM-205-423
BTS architectures and interoperability
31st Oct 01
Inst. 3–8
Installation & Configuration: Horizon macro indoor
CONTROLLED INTRODUCTION
68P02902W08-B
Horizon macro combining
A similar arrangement is used in the Horizon macro , which uses a Hybrid
Combiner Unit (HCU) and Dual stage Duplexed combining Filter (DDF), as
shown in Figure 3-7. The DDF has three input ports together with two internal
RF loads, and therefore does not require the addition of any external load.
Hybrid
HybridHybrid
Duplexer
Load
Load
DDF
HCU
One carrier from each of four transceivers
Carrier 1 Carrier 2 Carrier 3 Carrier 4
Load
Figure 3-7 Typical Horizon macro arrangement for combining four carriers