R&S®CLG

Cable Load

Generator

At a glance

The R&S®CLG cable load generator is a multichannel

signal generator for cable TV signals. It is the

world's first instrument to simulate cable TV

networks with full channel loading. The R&S®CLG

generates both digital and analog TV signals. These

signals can be freely combined, allowing users to

simulate any conceivable channel loading scenario

in the lab.

The R&S®CLG has a frequency range from 47MHz to

1002MHz, covering all cable TV frequency bands used

worldwide. Within this frequency range, the R&S®CLG can

generate up to 158 analog and digital channels using the

American 6MHz channel spacing or up to 119channels

using the European 8MHz spacing. Users can define the

signal levels and frequencies separately for each channel.

Each digital channel can transmit one transport stream or

pseudo random bit sequence (PRBS). The analog channels

carry a test pattern with test tones. To simulate the condi-

tions in a real-world cable TV network, the R&S®CLG can

superimpose 50Hz or 60Hz AC hum on all channels.

The R&S®CLG is primarily intended for testing cable TV

receivers and cable tuners. It can also be used to test

CATV amplifiers. If linearity demands on the device under

test (DUT) are very high, an external bandstop filter may

have to be used to improve the signal-to-noise ratio. The

R&S®CLG can be fully remote controlled, making it ideal

for integration into automatic test systems. All this func-

tionality has been packed into a compact instrument that

is only 19" wide and one HU high. To gener ate as many TV

signals as those delivered by the R&S®CLG previously re-

quired a rack full of generators.

Key facts

❙ Frequency range from 47 MHz to 1002 MHz

❙ Up to 158 channels for US cable TV

❙ Up to 119 channels for European cable TV

❙ More than 53dBc CNR and 60dBc CSO/CTB

❙ High MER of 40dB (typ.)

CNR: carrier-to-noise ratio;

CSO/CTB: composite second order/composite triple beat.

MER: modulation error ratio.

CLG_bro_en_5214-6416-12.indd 2 18.07.2014 15:15:15