The MO-270 is a DTMB modulator compliant with China’s national standard specification for digital terrestrial broadcasting GB20600-2006. The input to the modulator is an MPEG-2 Transport Stream (TS) in SPI or ASI formats. The output from the unit is a TDS-OFDM modulated DTMB signal upconverted to IF or RF. The modulator has been designed to achieve the maximum performance yet at an affordable price. The digital coding and modulation process is implemented with programmable logic devices using PROMAX proprietary IP. This makes the design highly flexible, allowing to tailor it to any particular application.
The MO-270 is a DTMB modulator that complies with China’s GB20600‑2006 standard for digital terrestrial broadcasting. It accepts MPEG‑2 transport streams via two ASI inputs or one SPI input and can generate a test transport stream internally.
The unit provides a 36 MHz IF output and an RF output that is frequency‑agile from 45 MHz to 875 MHz in 1 Hz steps, with selectable normal or inverted spectrum. Configuration is performed through a front‑panel LCD and rotary control, and the device includes Ethernet connectivity and status LEDs.
| Input format | MPEG‑2 Transport Stream |
|---|---|
| ASI inputs | Two, female BNC, 75 Ω |
| SPI input | One, LVDS DB‑25 connector |
| IF output | 36 MHz |
| RF output frequency range | 45 MHz – 875 MHz, 1 Hz steps |
| Average RF power | 0 dBm |
| Spectrum polarity | Normal or inverted, selectable |
| Mechanical dimensions | 19" wide × 1U high rack chassis (19" × 1.75" × 15") |
The RF output frequency can be adjusted from 45 MHz to 875 MHz in 1 Hz steps using the front‑panel controls.
Control is via a push‑rotary front‑panel knob with an LCD display, and two LEDs indicate power and synchronization status.