Motorola SG4-DRT-2X Betriebsanleitung PDF herunterladen (Seite 25)

Overview 2-11

SG4000 Installation and Operation Manual

Bandpass Frequency Splits

The SG4000 is configured with sufficient frequency bandsplits to accommodate global

requirements. The bandpass split can be determined from the model number, as indicated in the

chart below:

Model Bandpass Split

5-40/52 MHz-1 GHz

5-55/70 MHz-1 GHz

5-65/85 MHz-1 GHz

5-42/54 MHz-1 GHz

5-30/47 MHz-1 GHz

The components that determine the bandpass frequency splits include the plug-in diplex filters

and the vertical return-path low-pass filters (RPLPF-V-*) located in the SG4-RF modules. The

diplex filter provides the node crossover isolation at each port and the return-path low-pass

filters suppress any additional forward energy at the input to the return transmitters.

Forward Path Padding

The pad values presented in Table 2-2 serve as a starting point reference for typical

installations. While this chart is prepared specifically for 77-channel loading and standard split

configuration, the difference for 110-channel loading is approximately 1 to 2 dB less.

If the optical levels are high, or the transmitter’s optical modulation index (OMI) is higher than

specified, it may be necessary for you to select a JXP value 1 dB or 2 dB higher for the receiver

output pad than is shown in Table 2-2.

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Motorola SG4-DRT-2X Betriebsanleitung Seite 25