- DRM Modulator / Exciter
- DRM Modulator / Exciter
DRM Modulator Exciter - product specification
| TECHNICAL DATA: | |
| Direct Digital Synthesis (DDS) | |
| Frequency range 100 kHz to 30 MHz, 0.1 Hz step | |
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Stability vs. temperature (-30 to +70 °C): |
1x10-8 |
| Long term stability: | 1x10-6 for 10 years |
| 2x10-9 per day | |
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| Operation Modes | |
| AM, AMC, DAM and optionally DSB-SC, SSB | |
| DRM | |
| MCS, SCS | |
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| Synchronization | |
| Internal GPS | |
| External NTP server | |
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| Pre-corrections | |
| AMAM, AMPM | |
| Equalizer | |
| Automatic phase/envelope delay adjustment | |
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| Inputs | |
| MDI | (Ethernet 10/100 Base-T, RJ45) |
| Analog Audio | (20 Hz to 10 kHz, 600 Ω balanced, XLR) |
| Digital Audio | (AES/EBU 48/96/192 kHz, 110 Ω balanced XLR) |
| Baseband IQ | (over Digital Audio port) |
| 10 MHz REF | (external 10 MHz reference, 50 Ω, BNC) |
| EXT PPS | (external Pulse Per Second, 50 Ω, BNC) |
| GPS ANT | (GPS antenna input, 50 Ω, TNC) |
| RF IN | (RF input, 50 Ω, BNC) |
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| Outputs | |
| 2 x RF OUT | (direct RF output, 50 Ω, 2 x BNC) |
| RF TEST OUT | (selectable, 50 Ω, BNC) |
| CARR MON | (carrier monitor, 50 Ω, BNC) |
| 48 KHz OUT | (48 kHz clock, 50 Ω, BNC) |
| RF Phase | (phase modulated carrier, over RF OUT port) |
| AF Envelope | (600 Ω balanced, XLR) |
| Digital IQ | (AES/EBU 192 kHz, 110 Ω balanced, XLR) |
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| Remote Control over RS422 (DB9 female) | |
| Phase Noise Performances | |
| 10 Hz | -110 dBc / Hz |
| 100 Hz | -130 dBc / Hz |
| 1 kHz | -140 dBc / Hz |
| 10 kHz | |
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| Power Supply: 230 VAC single phase, 50 Hz | |
| Dimensions: 19’’ rack mounts, h = 2U | |
DRM Modulator Exciter
The RIZ DRM Modulator / Exciter is designed in compliance with the ETSI ES 201 980 DRM system specification, and it comes built-in as standard unit in RIZ transmitters of the newest generation.
It decodes data transported using the MDI / DCP protocol and modulates it to a signal that conforms to the DRM specification without the need of any additional source of information. The data is sent in packets asynchronously, so different standard transport mechanisms may be used (UDP / IP, TCP / IP, files, serial port etc). It is possible to combine several data streams, each using a different communication protocol, to get better reliability. Due to the fact that some transport mechanisms can be unreliable, a forward error correction mechanism is provided (DCP-PFT).
For better reliability it is possible to have two independent sources for the same MDI stream. For example an UDP satellite link and a link over the Internet (TCP / IP) or any other combination (serial, telephone, file, etc). The parameters of the RIZ DRM Modulator / Exciter can be controlled and/or monitored from a remote site (e.g. broadcaster’s control room) using the RS422 or SNMP remote interface.
The exciter supports different types of analog modulation (AM, AMC, DAM, optionally DSB-SC, SSB) as well as simulcast modes (SCS, MCS) according to the ETSI ES 201 980 DRM standard.
