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Application Notes: Forward Sweep and Balance

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downstream spectrum. The factory default is 51 MHz on the Tx and 52 MHz

on the Rx.

NOTE: If diplex filters in the actives have a sharp roll-off, it

may be wise to move the telemetry to a frequency that is

more reliable.

Forward Telemetry Level determines the level of the telemetry signal (FSK).

This should be set 10 dB below the video reference level. The telemetry

level is adjustable from 20-50 dBmV in 2 dB increments. The max is 50

dBmV, however some older units may have a max of 40 dBmV.

Forward Sweep Insertion Level is the level at which sweep insertion points

will be inserted; 40 or 50 dBmV is the max. Sweep points should be 14-16

dB below the video reference level. Sweep points fall on the video and/or

audio frequency of unused channels by default, but can be moved.

NOTE: Initially, set the Telemetry and Sweep Insertion

levels to the minimum of 20 dBmV each. Change the

sweep insertion level until the sweep insertion points are 4-

16 dB below the closest visual carrier. Once the sweep is

set correctly, change the Telemetry level to 4 dB above the

Sweep Insertion level.

Include Audio Carriers means that the references will include all audio

carriers; if you chose no, the sweep will be faster but will display less

resolution.

Enable Reverse Sweep allows reverse sweep to operate. If disabled, the

forward sweep will be faster.

Enable Live Headend Ingress View allows reverse noise to be transmitted

on the forward telemetry. If disabled, the forward sweep will be faster.

Reverse Telemetry Frequency is not applicable for forward sweeping.

Reverse Sweep Plans is not applicable for forward sweeping.

Copying Channel Plans

Ensure the sweep receiver is connected to the Tx by means of the 9 pin, RS-

232 connector on the back of the receiver and the front of the Tx. This cable

is supplied by Acterna and has a specific pin configure (refer to manual for

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Wavetek 147 Spezifikationen Seite 334