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QPSK Modulator D9482

SKU: D9482 (AC Powered)
Units in Stock: 4
QPSK Modulator D9482 AC Powered
Condition: Pre-Used TG90
Price: $1,995.00
QPSK Modulator D9482
QPSK Modulator D9482
Product Details



The Model D9482 QPSK Modulator is an integral component of Scientific-Atlanta’s Digital Headend product line. This device works in conjunction with digital set-tops, including Scientific-Atlanta’s Explorer® family of set-tops, and the QPSK Demodulator to provide a forward signaling and reverse path communications for interactive video and data systems over a conventional two-way CATV plant.




• Interfaces with up to eight reverse-path demodulators through ATM25 interfaces

• Contains interleaving and Reed-Solomon FEC for improved performance

• Implements DAVIC MAC control algorithm

• Provides 10/100Base-T Ethernet interface for all application data plus remote provisioning, control, status monitoring, and alarms




Input 10/100 Base-T Ethernet

RF Specifications

Frequency Range (center frequency) 54 MHz to 550 MHz

Minimum Tuning Step Size 250 kHz

RF Output Power Level +50 dBmV to +60 dBmV (minimum range)

RF Output Impedance 75 O

RF Output Return Loss = 12 dB (45 MHz to 550 MHz)

Inband Spurious Outputs (50 MHz to 550MHz) < -57 dBc

Noise Floor (out-of-band) < -126 dBc/Hz > 25 MHz from center frequency

Output Power level with Carrier Squelched < 0 dBmV

Output Frequency Error (over temperature) < ±10 ppM

RF Test Point Level RF Output Power - 20 dB (±2 dB)


Modulation Specifications


Modulation Type Quadrature Phase Shift Keying

Error Correction Reed-Solomon t = 1

Carrier Suppression > 30 dB

Data Rate 1.544 Mbps

Data Shaping Filter Square Root Raised Cosine; alpha = 0.30

Spectral Mask Offset from Center (MHz) Response (dB)

0.5018 < -21

0.772 < -40

Error Vector Magnitude = 3.0%


Electrical Specifications


Voltage (2 options) -42 V dc to -56.7 V dc (option 1)

85 V ac to 264 V ac (option 2)

Power < 65 W