ATX QFHPN Руководство по установке и эксплуатации - Страница 10

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CHAPTER 3: POWER UP AND TEST
3.3

Fine-tuning the Compact Node to the RF Network

In some cases, the output of the compact node may need to be adjusted. The compact node has built-in attenuation and
equalization features that allow you to optimize the system.
3.4

Changing the RF Attenuation

The attenuation feature allows you to reduce the RF output into the coax network in the case where overdriving is being
experienced. Attenuation can be applied in 1dB increments up to a maximum of 16db as follows:
1.
Using the arrow button, select the "ATT" mode. The current attenuation setting will be displayed.
2.
Press and hold the return button until the display starts to blink.
3.
Use the arrow buttons to change the value shown on the blinking display to a desired value.
4.
Click the return button to set the attenuation value into memory. The display stops blinking.
The RF output level has now been changed and set.
3.5

Changing the RF Equalization

The Equalization feature allows you to change the tilt on the RF output to compensate for the losses in the coax cable. High
frequency channels tend to be attenuated by the cable more than the low frequency channels. Changing the tilt attenuates the
lower channels but not the high channels to overcome the cable loss issues. The attenuation can be applied in 1dB increments
up to a maximum of 16 as follows:
1.
Using the arrow button, select the "EQ" mode. The current tilt setting will be displayed.
2.
Press and hold the return button until the display starts to blink.
3.
Use the arrow buttons to change the value shown on the blinking display to a desired value.
4.
Click the return button to set the equalization value into memory. The display stops blinking.
The RF tilt has now been changed and set.
3-2
HFC Enhance
– QFHPN High Power Optical Node with AGC – Installation & Operation Manual
®