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Measuring equipment in CATV networks

Multifunctional measuring device KingType CDS783AQ

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KingType CDS783AQ – is a multifunctional measuring device for the CATV operators that allows performing all complex of measurements necessary for adjustment and operation of CATV networks. This device has an advantageous combination of a "compact" housing design characteristic of portable devices and functionality typical of the higher level devices.

KingType CDS783AQ device was created specially for operators of the modern multiservice networks.  It allows to work with the DVB-C analog and digital television signals (QAM modulation) and also to measure the direct channel parameters under the DOCSIS standard (QAM modulation). The device allows to measure the digital signals radio-frequency parameters (in particular: C/N, SNR, MER, Pre-BER, Post-BER), analyze digital streams (formation of constellation charts and spectrum analysis performance) and to monitor digital channel quality, including that in the return channel range of interactive cable networks.

Functional features and advantages of the model CDS783AQ:

  • Multifunctional, backlit, the liquid-crystal display of the device is capable to display simultaneously all information, concerning any given measurement - both alphanumeric and graphic. When measuring the analog television signals, signal level of the carrying video and audio (in dB/mkV) or level of the carrying video and signal-to-noise ratio (in dB) is displayed. Therefore, the signal level and quality estimation is performed simultaneously.
  • CDS783AQ also measures radio-frequency parameters of digital signals: digital signal power and signal-to-noise ratio (S/N) and also error rate (BER, MER).
  • In a scanning mode the device automatically checks the signal presence in all television channels of the selected frequency plan. The result of scanning is displayed in the form of a chart: each signal has a corresponding mark which height is proportional to the signal level.
  • A spectrum analyzer mode helps to determine the noise and interference sources both in direct and return channel. This function can be useful, for example, when searching for the noise sources in the return channel.
  • Quite often, the input connector is the cause of failure for the devices frequently used in the field: it deteriorates quickly. That is why the CDS783AQ input connector is made of two parts: the device part of F-"male" type and the replaceable adapter F-F "female-female". The cheap adapter is the one that wears out and can be replaced in a matter of seconds. The device part remains and has a long-term service.
  • The device can be energized both from the built-in accumulator batteries and by means of network adapter.
  • The device is completed with a convenient cover for carrying.

Measuring frequency range

Range

5 ~ 870 MHz

Accuracy

10-5 (at a temperature 20oС±5oС)

Resolution

50 kHz minimum

RBW

100 kHz, 300 kHz, 8 kHz (auto selection)

Analog signal level measuring (peak power)

Signal types

CW, AM, FM

Range

30 ~ 120 dBmkV (-40 ~ 60 dBmV) – typical value

Accuracy

± 1,8 dB (ОoС ~ 40oC, in 1 minute after initiation)

Resolution

0,1 dB

Digital signal level measuring (channel power)

Signal types

QPSK, QAM, COMDF, random signal waveform

Range

35 ~ 100 dBmkV (-35 ~ 40 dBmV)/100 kHz (typical value)

Accuracy

± 2 dB (ОoС ~ 40oC, in 1 minute after initiation)

Resolution

0,1 dB

Meter bandwidth (MBW)

8 MHz (linearly integrated)

QAM analyser

Modulation types

QAM A: 16, 32, 64, 128, 256 QAM; QAM B: 64, 256 QAM

Symbol rate

1 ~ 8 MHz

Precorrection error rate (Pre-FECBER)

1,3x10-1 ~ 1,6x10-8  error rate BER, (typical value)

Modulation error rate (MER)

19 ~ 37 dB (typical value)

Power supply

Accumulator

7,4 V / 5 A x h (lithium)

Hours of service

> 16 hours (average),

> 10 hours (when used continuously)

Alternating current adapter

150 ~ 260 V / 1A 50/60 Hz (alternating current),
8,4 V / 1A (direct current)

Charging time

~ 4 hours

Other parameters

Input RF port

F-connector, 75 Ohm

Display

liquid-crystalline, monochrome, manual control of backlit

Dimensions, mm (W х H х L)

183 × 56 × 190

Weight, kg

2,6

Storage temperature

- 20оС ~ +50оC (in dry conditions)