DMB 670
Transmitter for DAB Digital Radio and DMB Mobile TV
The DMB 670 VHF solid-state transmitter is designed to provide today’s multimedia broadcaster with a transmitter platform capable of multiple modulation schemes. Incorporating the field-proven DAB 665 multi-standard exciter, the DMB 670 provides world-class performance, reliability and quality.
The DAB 665 low-power unit contains complete DAB/DMB signal processing ac-cording to the EUREKA Project 147 specifications from the ETI input to the RF output. The low-power unit contains the integrated transmitter control and moni-toring system and communicates to the power amplifier (PA) bays in the system via RS-485. The amplifier bays hold a range of RF modules for pre-filter powers from 40 W to 10 kW using straightforward, reliable construction for simple operation and maintenance.
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Features
- Extremely high power density for a compact and lightweight space-saving design
- Reliable COFDM encoder generation with 12-bit resolution and:
- Uninterruptable input signal switchover
- Automatic NI/NA input signal detection
- All-digital linear and non-linear precorrection
- Direct modulation with tunable synthesizer
- GPS-receiver with extremely stable OCXO
- Powerful monitoring system:
- User-friendly interface PC and Web interface
- Straightforward control, monitoring and in-depth diagnostics using an easy to use front panel control
- Optional TCP/IP or SNMP remote monitoring interfaces
- Cost effective — reliable construction
- Digital power levels up to 10 kW pre filter from two 19 inch rack cabinets
- Fully broadband modules 168 to 242 MHz
- 1:1 PA Module to power supply redundancy
- Hot-pluggable, linear RF amplifier modules and auto-ranging power supplies
Product Details
Each DMB 670 transmitter combines a low-power unit and one or more amplifier bays, each with various configurations of PA modules to achieve the rated power. The amplifier bays contain several major systems:
Power Amplifier (PA)
The hot-pluggable module features a pair of broadband (168 to 242 MHz) RF power amplifiers that require no user adjustments. Each amplifier can be easily replaced with a pre-tuned pallet, eliminating the need for optimization in the field. The PA modules are identical and fully interchangeable among all power classes in the DMB 670 transmitter family, regardless of configuration.
Power Supply (PS)
The hot-pluggable module is a 1200 W, 48 V PS with a .98 power factor and mains input range of 90 to 264 V. The PS interface provides on/off functionality to the power supplies, a fan tachometer alarm and redundant feed to the cooling system. Each module also has 5 V output to redundantly drive the low-voltage control circuits.
Cooling System
The air-cooling system includes internal redundant blowers that pull cool air from the front through a removable filter, as well as exhausts in the rear. Systems integrated in Harris cabinets feature top exhaust to support ducting and can optionally have ducted air input plenum to permit top, bottom or rear air input.
Control System
The main system control is located in the low-power unit and communicates with each amplifier bay, each of which has independent protection and control capabilities. Each PA module has dedicated control and monitoring to support on/off functionality and alarms for reflected power, temperature and current overloads.
Output Filter
Optionally used to ensure mask compliance. These filters are compact, temperature-stable and provide low insertion loss. The non-critical spectrum mask filter has a six-circuit bandpass, while the critical mask filter requires the addition of two traps.
Images/Diagrams
V 670 - 2000/D Amplifier Diagram
Specifications
Specifications and designs are subject to change without notice.
| General | |
| Modulation Type | DAB mode I |
| DAB Power Output Range (rms)1 | DMB670-125: 35 to 160 W |
| DMB670-250: 125 to 315 W | |
| DMB670-500: 250 to 630 W | |
| DMB670-1000: 500 to 1250 W | |
| DMB670-2000: 1000 to 2500 W | |
| DMB670-4000: 2000 to 5000 W | |
| DMB670-6000: 3000 to 7500 W | |
| DMB670-8000: 4000 to 10000 W | |
| Excitation | DDS synthesis, no-IF, direct IQ modulation on channel |
| SFN-capable with external reference or internal GPS option | |
| DMB670-125/250: DAB-665/0.2T-E06 | |
| DMB670-250/…/8000: DAB-665/40T-E06 | |
| RF Amplifers | MOSFET, broadband (no-tune), hot plug modular, universal (same type, all tx models), 9.9 lbs (4.5 kg) |
| Power Supplies | Switchmode, auto-ranging, hot plug modular, universal, 5.5 lbs (2.5 kg) |
| Frequency Range | 174 to 240 MHz, in 8 kHz increments |
| Frequency Stability (without ext. reference) | <5 x 10 E-10 per day (OXCO aging) |
| Power Stability | ±0.25 dB |
| VSWR | Protected against open or short circuit, all phase angles |
| Capable of operation into infinite VSWR with user-adjustable foldback threshold | |
| Factory pre-set to 4% of nominal nameplate power (VSWR = 1.5:1) | |
| Harmonic/Spurious Output | Complies with EN 302077-2 when used in conjunction with filter having following attenuation specifications: |
| Critical Mask | Integrated in-band loss | <1 dB |
| fc +/- 970 kHz: | >15 dB | |
| fc +/- 1.75 MHz: | >45 dB | |
| fc +/- 3 to 10 MHz: | >45 dB | |
| 2 fc: | >50 dB | |
| 3 fc: | >10 dB | |
| 4 fc: | >0 dB | |
| Non-Critical Mask | Integrated in-band loss | <1 dB |
| fc +/- 970 kHz: | >0 dB | |
| fc +/- 1.75 MHz: | >15 dB | |
| fc +/- 3 to 10 MHz: | >45 dB | |
| 2 fc: | >50 dB | |
| 3 fc: | >10 dB | |
| 4 fc: | >0 dB | |
| Shoulder Pre-Filter | <-35 dB, minimum <-40 dB, typical (compensated) |
| Shoulder Post-Filter | <-45 dB, minimum (compensated)2 |
| Nonlinear Precorrection | All-digital, user-adjustable |
| Storage of 7 presets | |
| DAB critical mask compliant over entire power range without need for re-adjustment (when used with specified filter) | |
| Linear Precorrection | All-digital linear compensation of mask filter frequency response |
| In-Band Frequency Response | <1 dB3 |
| Phase Noise | TR 101 496-3 compliant |
| Minimal Performance Levels | 10 Hz to 75 Hz | -50 dBc |
| 250 Hz | -60 dBc | |
| 1 kHz | -72 dBc | |
| 2 kHz | -78 dBc | |
| 10 kHz | -92 dBc | |
| 100 kHz | -112 dBc | |
| Inherent Processing Delay | 183 ms |
| 83 ms seamless input switcher | |
| 100 ms COFDM encoder | |
| Delay Compensation | Dynamic (network padding) delay: 0 to 1 sec in 61 ns steps |
| Static (transmitter trimming) delay: 0 to 1 sec in 61 ns steps | |
| AC Mains | |
| AC Mains Requirement | 195 to 264 V 47 to 63 Hz, IEC C14 inlet for exciter and following connections to power amplifiers: |
| DMB670-125/…/500: 90 to 264 V, 47 to 63 Hz, dual IEC C20 inlets4 | |
| DMB670-1000: 190 to 264 V, 47 to 63 Hz, triple IEC C20 inlets5 | |
| Configurable on-site for single or three-phase connection: | |
| 190 to 264 V single phase, 190 to 264 V delta, 190 to 264 V wye, or 330 to 450 V wye | |
| DMB670-2000/…/8000: Same as 1000 W model except triple | |
| PowerCon NAC3MPA inlets for each 2000 W chassis | |
| Optional in-rack AC distribution chassis provides individual circuit breaker protection for each mains input | |
| Power Consumption (including exciter, at maximum before-filter power level) | DMB670-125: 1000 W maximum, 800 W typical |
| DMB670-250: 1500 W maximum, 1300 W typical | |
| MB670-500: 2500 W maximum, 2225 W typical | |
| DMB670-1000: 4600 W maximum, 4300 W typical | |
| DMB670-2000: 9200 W maximum, 8500 W typical | |
| DMB670-4000: 18400 W maximum, 17000 W typical | |
| DMB670-6000: 27600 W maximum, 25500 W typical | |
| DMB670-8000: 36800 W maximum, 34000 W typical | |
| Power Factor (displacement) | 0.98, typical |
| Phase Rotation/Balance | All AC inputs independent
Observation of correct phase rotation and balance not required |
| Mains Restart | >80% output power in less than 5 sec after AC mains failure |
| Environmental | |
| Altitude | 9,842 ft (3000 m) elevation above mean sea level |
| Ambient Temperature Range | 32 to 122° F (0° to 50° C) at sea level |
| Upper limit de-rated 2° C per 984 ft (300 m) elevation AMSL | |
| Humidity | 95%, non-condensing |
| Mechanical | |
| Dimensions6 | Standard EIA rack 48.3 cm (19 in.); 1RU = 4.45 cm |
| DMB670-125: 5RU amp + 6RU exciter, 60 cm depth | |
| DMB670-250: 5RU amp + 6RU exciter, 60 cm depth | |
| DMB670-500: 5RU amp + 6RU exciter, 60 cm depth | |
| DMB670-1000: 16RU amp + 6RU exciter, 62 cm depth | |
| DMB670-2000: 16RU amp + 6RU exciter, 62 cm depth | |
| DMB670-4000: 44RU rack, 91 cm depth | |
| DMB670-6000: 2 x 44RU rack, 91 cm depth | |
| DMB670-8000: 2 x 44RU rack, 91 cm depth | |
| Weight, Exciter/Low Power Stage | DAB-665/40T: 30 kg approx. |
| Weight, Amplifier Chassis | DMB670-125: 25 kg approx. |
| (all modules installed) | DMB670-250: 35 kg approx. |
| DMB670-500: 35 kg approx. | |
| DMB670-1000: 65 kg approx. | |
| DMB670-2000: 95 kg approx. | |
| Weight, Transmitter | DMB670-4000: 240 kg approx. |
| (all modules installed) | DMB670-6000: 330 kg approx. |
| DMB670-8000: 480 kg approx. | |
| Air Cooling | Air input with built-in filter at front |
| Air exhaust with built-in DC fans at rear | |
| Ducted air exhaust and/or input available as option | |
| DMB670-125: 6 m3/min. | |
| DMB670-250: 12 m3/min. | |
| DMB670-500: 12 m3/min. | |
| DMB670-1000: 34 m3/min. | |
| DMB670-2000: 34 m3/min. | |
| DMB670-4000: 68 m3/min. | |
| DMB670-6000: 102 m3/min. | |
| DMB670-8000: 136 m3/min. | |
| Ambient Noise | Worst case, 1 m from front face, 1 m above ground |
| Mounted in rack, no ducted air input or exhaust | |
| Figures in parentheses are for ducted air input and exhaust option | |
| DMB670-125: <65 dBA | |
| DMB670-250: <68 dBA | |
| DMB670-500: <68 dBA | |
| DMB670-1000: <73 dBA (65 dBA) | |
| DMB670-2000: <73 dBA (65 dBA) | |
| DMB670-4000: <76 dBA (67 dBA) | |
| DMB670-6000: <78 dBA (69 dBA) | |
| DMB670-8000: <78 dBA (69 dBA) | |
| Inputs/Outputs | |
| RF Output Connector | DMB670-125: Type N female, 50 ohms |
| DMB670-250: Type N female, 50 ohms | |
| DMB670-500: Type N female, 50 ohms | |
| DMB670-1000: DIN 7-16 female, 50 ohms | |
| DMB670-2000: EIA 1-5/8 flangeless, 50 ohms | |
| DMB670-4000: EIA 1-5/8 flangeless, 50 ohms | |
| DMB670-6000: EIA 1-5/8 flangeless, 50 ohms | |
| DMB670-8000: EIA 1-5/8 flangeless, 50 ohms | |
| ETI Inputs/Outputs | BNC female, 75 ohms 2 x ETI (NI, G703) or 2 x ETI (NA, G704) with auto-sensing, auto switchover, and optional descrambling |
| Manual or automatic switchover based on user-defined thresholds/priorities | |
| Seamless switching of two coherent ETI signals | |
| Muting upon absence of valid ETI input | |
| Optional 2.048 Mbit/s, unbalanced/balanced adapter | |
| QPSK Input | SMA female, 50 ohms, 950...2150 MHz,-65...-25 dBm typical, 55 MHz BW, 1...45 MSymb/s, DVB-S QPSK per EN 300421 |
| LNB Supply | +12.5...+4 V (maximum 350 mA) (vertical) |
| +17.2...+18.8 V (maximum 350 mA) (horizontal) | |
| GPS Input | SMA female, 50 ohms, 1.57542 GHz, -130...-100 dBm (+5 VDC @ 100 mA max output for active antenna) |
| 1 pps Input | BNC female, 75 ohms, TTL level, rising-edge |
| Reference Frequency Input | SMA female, 50 ohms, 0.1/0.5/1/2.048/5/10 MHz,- 7...+15 dBm |
| Frequency Control Switching | Manual or auto selection of internal GPS, external 1 pps, or external reference frequency by user-defined priorities
Muting upon failure of reference after user-adjustable hold-over (0 to 24 h approximately) 72-hour hold-over optional with precision oscillator option |
| Sample Monitoring Ports | SMA female, 50 ohms |
| SAT IF- ETI OUT | |
| ETI (NI)- ETI frame | |
| COFDM frame | |
| LO- RF monitor (low power stage) | |
| 1 Hz (1 pps signal) | |
| Reference frequency 10 MHz | |
| Incident and reflected signal Tx output (optional) | |
| Remote Control | |
| RF Output Alarms | User-adjustable warning and error thresholds (nominal -0.5 dB and -3.5 dB from factory) |
| Parallel Remote | DB37 female. Pin assignment programmable via Web remote |
| Relay contacts | 25 mA @ 24 VDC |
| Digital inputs (TTL level) | Pulse duration ≥100 ms signal |
| RS-232 (TCP-IP) | DB9 female |
| Bit-Bus In/Out (RS-485) | DB9 male/female |
| Ethernet (optional) | RJ45, twisted pair |
| - SNMP control (v1, v2c, v3) | |
| - Web control (java applet) | |
| - E-mail notification | |
| Security Interlocks | DB9 or DB15 female |
| - Safety loop (forced stop) | |
| - RF blocking (forced RF mute) | |
| MSNC Control | Via ETI stream |
| - DAB mode | |
| - Muting | |
| - Dynamic delay | |
| - Static delay | |
| - Offset delay | |
| - TII value | |
| Compliance | |
| RoHS 2002/95/EC | |
| R&TTE 1999/5/EC | |
(1) Power ratings are at amplifier output connector/before DAB mask filter
(2) When used with minimum specified critical mask filter, above
(3) At amplifier output, any frequency, any time (N+1 applications). Excludes output filter
(4) Certified to 100 to 240 V nominal range +/- 10% testing margin
(5) Certified to 208 to 240 V nominal range +/- 10% testing margin
(6) All figures for DMB670-125/…/2000 models are for basic exciter and power amp combination without optional rack pre-integration
All figures for DMB670-4000/…/8000 models include EIA rack. Add 34 cm to rack depth for optional ducted air input option
| DMB 670 Model | 125 | 250 | 500 | 1000 | 2000 | 4000 | 6000 | 8000 |
| Power Before Filter-Watts | 35 to 160 | 125 to 315 | 250 to 630 | 500 to 1250 | 1000 to 2500 | 2000 to 5000 | 3000 to 7500 | 4000 to 10000 |
| Output Connector | “N” female | “N” female | “N” female | DIN 7-16 | 1-5/8 in. EIA | 1-5/8 in. EIA | 1-5/8 in. EIA | 1-5/8 in. EIA |
| Rack Space | 11RU | 11RU | 11RU | 22RU | 22RU | 1 Cabinet | 2 Cabinets | 2 Cabinets |
| PA Modules | 1 | 2 | 2 | 4 | 9 | 18 | 27 | 36 |
| PS Modules | 1 | 2 | 2 | 4 | 8 | 16 | 24 | 32 |
Sales Contacts
- North America +1 800 231 9673
- Caribbean and Latin America +1 786 437 1960
- Europe and Africa +44 118 964 8200
- Middle East and South Asia +971 4 433 8250
- Asia, Pacific Rim +852 2776 0628
