Tower Top Amplifier (TTA)
A TTA places a low-noise preselector and low-noise amplifier (LNA) at the tower top, close to the receive antenna. This location minimizes feeder loss and reduces the overall receive noise figure—delivering stronger uplink “talk-back,” wider coverage, and more reliable site access in LMR/PMR systems. High-quality filtering and strong linearity help prevent overload and intermodulation.
Sinclair advantage: Sinclair TTA systems are delivered as a matched package with the TTA and receiver multicoupler/controller together. This integrated approach optimizes end-to-end performance, simplifies integration, and ensures a balanced site design.
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Sinclair advantage: Sinclair TTA systems are delivered as a matched package with the TTA and receiver multicoupler/controller together. This integrated approach optimizes end-to-end performance, simplifies integration, and ensures a balanced site design.
Intermod 抑制面板
互调抑制面板由隔离器和二次谐波滤波器组成。隔离器仅允许射频在一个方向通过，二次谐波滤波器可减少隔离器产生的二次谐波信号。它们一起通过抑制发射天线接收的信号来减少互调。它们还可以防止任何反射功率反射到负载而不是功率放大器，这可能会对放大器造成严重损坏。反射功率可能是由高 VSWR、开路、短路天线或现场共置发射机引起的。当组合系统不可行时，互调抑制面板是清除拥挤站点干扰的好方法。
