Motorola LM100 Provozní pokyny stáhnout pdf (Strana 32)

3-10 Installation and Setup

GX2-LM1000E* Installation and Operation Manual

Before you connect the input cable to the main (broadcast) input or secondary (narrowcast)

input on the GX2-HSG* rear panel, use a signal level meter, RF power meter, or a spectrum

analyzer to measure the RF input signal level.

3 Compare the RF input signal level to the specified RF input level noted in Appendix A,

“Specifications.” It may be necessary to adjust the RF input-per-channel level to be within

the noted specification.

You can calculate this level based on the equation: 10 x log

(ratio of channels). Referring to

Figure 3-9 may also be useful in determining appropriate input levels. Avoid varying from

the nominal input, as higher levels cause degraded distortion performance and lower levels

can approach the AGC range limit and add additional noise to the link.

Reminder—the narrowcast RF input port requires a +22 ±0.5 dBmV higher RF input level

than the broadcast RF input port.

4 After you correctly set the RF signal level, connect the corresponding RF cable to the

preferred RF input port G- to F-type connector (broadcast and/or narrowcast) on the rear of

the GX2-HSG*. Confirm that it is connected to the slot occupied by the GX2-LM1000E*.

5 Install a 75-ohm terminator on any unused RF input ports. A 75-ohm terminator is provided

with the GX2-LM1000E*. Figure 3-8 illustrates the RF connection points.

Figure 3-8

GX2-HSG*rear-panel RF connections

Upon receipt of an acceptable RF input signal level, the GX2-LM1000E* front panel

STATUS

LED illuminates green.

With RF input signals applied to the GX2-LM1000E*, you can monitor the broadcast RF

input level using

RF TP1 on the front panel without removing the RF signal from the rear of

the GX2-HSG*

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Motorola LM100 Provozní pokyny Strana 32