The DM8-R ATSC modulator accepts an ATSC-compliant SMPTE 310M or optional ASI digital bit stream and generates a 44 MHz ATSC standard signal.

To modulate to the ATSC standard, the digital data stream is first randomized and then forward error correction (FEC) is applied through Reed-Solomon encoding, data field interleaving and trellis coding per the ATSC standard.

The FEC signal processing minimizes data errors in the digital bit stream and reduces the chance of burst errors, while significantly improving the system coding gain. The data is then equalized, processed through pulse shaping filters and pre-corrected for both linear and non-linear transmitter distortions. Finally, the data is modulated to the ATSC signal (centered at 44 MHz) utilizing Quadrature Vector Modulation techniques. A crystal controlled oscillator provides excellent stability and performance.

Front panel LEDs provide a quick indication of operating status and performance of the modulator. In addition, a 9-pin serial port is provided for the configuration of the digital linear and nonlinear pre-correctors.

Industry Renowned Manufacturing and Support
Like all Axcera products, the DM8-R is manufactured and supported by our world-class organization under strict ISO 9001:2008 quality control. Learn More

DM8-R Modulator Block Diagram

General
Modulation Type Symbol Rate Error Protection (Per ATSC Standard) Signal to Noise Ratio Out of Band Rejection EVM	ATSC 10.76 MHz RS (207, 187) t=10, Convolutional Interleaver, 2/3 Rate Trellis Encoder 34 dB min (36 dB typical) 41 dB min (47 dB typical) 2.0% max (1.5% typical)
Correction
Linear Nonlinear	±3 dB +6 dB, -0 dB
Data Interface
Data Rate (ATSC Transport Stream) Interface	19.39 Mbps, 6MHz channel SMPTE 310M (ASI optional)
IF Output
Frequency Impedance Level	44 MHz IF, 6 MHz channel, Inverted (High Pilot) 50 ohms -6 dBm average
Mechanical
Size (W x D x H) Weight	19" x 12" x 1.75" 6 lbs
Power Requirements
Line Voltage Power Consumption	84 to 264 VAC, 1 Phase 50/60 Hz 50W
Test Signal Capabilities
MPEG Source Test Waveforms	Internal PRBS-23 Zero Pilot

For more information and detailed specifications please contact us at 724-873-8100 or email: info@axcera.com.