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Diamond CD®
Solid-State UHF ATSC Transmitter
The Diamond CD® transmitter line features LDMOS, solid-state technology and provides a new level of UHF reliability for ATSC broadcasters. Each Diamond CD system includes a control cabinet and one to five power amplifier (PA) cabinets. The control cabinet houses the system controller, exciter, monitoring and control panel/graphical user interface (GUI), driver amplifier and an optional second exciter and driver with automatic changeover.
An upgrade allows Diamond CD transmitters to provide IP-based control and monitoring via the Harris® eCDi® system, either tied to the station LAN or directly to the Internet.
Features
- Apex M2X™ multimedia exciter, allowing easy migration between standards
- Real-Time Adaptive Correction (RTAC™), providing continuous automatic correction that ensures optimum performance at all times
- Developed specifically for the demands of digital transmission for uncompromised signal quality
- Parallel operation of redundant components for unsurpassed reliability
- Compact footprint, yet powerful configuration for flexible installation layouts
- Modular power supply design for continued operation while faulty unit is removed
- On-air servicing of PA modules, eliminating downtime
- Air-cooled amplifiers for ease of installation and low maintenance costs
- Backed by broadcasting’s most extensive factory support, including 24-hour technical assistance, around-the-clock parts and comprehensive training
Product Details
Control Cabinet
The control cabinet houses the system controller, monitoring and control panel, exciter, driver amplifiers and an optional second exciter with automatic changeover. It also controls electronic RF phase and gain balancing used in multiple amplifier cabinet configurations. Serial RS-232 and standard, parallel remote control interfaces are also included.
Graphical User Interface
An eye-level interface provides easy-to-understand transmitter status information, complete with signal flow diagrams and analog bar-graph metering.
Power Amplifier (PA) Cabinet
When fully populated with 16 power amplifier (PA) modules, each cabinet is a self-contained RF power amplifier with its own AC power feed, control circuits, interlocks, air cooling, RF amplifiers and power supplies.
Power Amplifiers
All PA modules are identical and interchangeable. Each hot-pluggable module features a high-speed DC switch that disables the module if a fault occurs or if the module is removed from the transmitter. Modules are protected against high reflected power, over-temperature, low gain and RF overdrive conditions. Fault status and metering are displayed on the main control panel.
Solid State Amplification
Using the latest technology in LDMOS power transistors, the RF amplifiers are extremely rugged. They provide high efficiency, high gain and exhibit excellent thermal characteristics. Linearity and IMD performance are better than older bi-polar designs. Unlike tube amplifiers, solid state devices have no wear-out mechanism.
Power Supplies
Compact, modular, regulated power supplies can be removed while the transmitter is on the air. Power supplies are protected from incoming AC line transients, overcurrent and overvoltage. Up to eight power supplies per PA cabinet minimize output power loss. The result is minimal loss of viewers due to the cliff effect.
Cooling
Air cooling with internal or external fans is provided. With the internal fan, air enters through filters in the rear door of each PA cabinet and is circulated by a direct drive fan. Air is exhausted from the top of the cabinet. An optional, external version is ideal when it is necessary to isolate transmitter cooling air from building air.
Specifications
Specifications and designs are subject to change without notice.
| General | |
| RF Load Impedance | 50 ohms, 1.1:1 VSWR over specified TV channel |
| RF Output Connector | 3 1/8 in. EIA (PA cabinet outputs) |
| Frequency Range | Any specified UHF TV Channel, 470 to 806 MHz |
| Data Input | SMPTE 310M, 19.39 Mb/s |
| Data Input Connector | BNC, 75 ohms |
| PFC Input | 10 MHz sinusoid, 0 to +10 dBm, BNC, 50 ohms |
| Performance -DTV Power Output1 | ||||
| Model | Output Power | Model | Output Power | |
| DHD8P1 | 1.8 kW average | DHD45P2 | 10.5 kW average | |
| DHD10P1 | 2.5 kW average | DHD60P2 | 14 kW average | |
| DHD15P1 | 3.6 kW average | DHD90P3 | 20.5 kW average | |
| DHD20P1 | 5.5 kW average | DHD120P4 | 27.5 kW average | |
| DHD30P1 | 7.25 kW average | DHD150P5 | 34.5 kW average | |
| Stability of Output Power | ±2% or better |
| Frequency Stability (Pilot)1,6 | ±200 Hz/month |
| Frequency Offsets | Per FCC requirements |
| SNR (MER)2 | ≥27 dB |
| Harmonic and Spurious Radiation | Compliant with FCC requirements (Title 47 CFR 73.622) |
| Sideband Performance | Compliant with FCC mask, with Harris-specified output filter (Title 47 CFR 73.622) |
| Service Conditions | |
| Ambient Temperature Range3 | 32° to 113° F (0° to 45° C) |
| Ambient Humidity Range | 0 to 90% relative humidity, non-condensing |
| Altitude4 | 0 to 7,500 ft (2,286 M) AMSL |
| Physical Dimensions and Weights | Size (W x D x H) | Weight |
| DHD8P1 through DHD30P1 | 57.1 x 61 x 72.25 in.
(1.4 x 1.5 x 1.8 m) | Up to 2,488 lbs (1,128 kg) (DHD30P1) |
| DHD45P2 and DHD60P2 | 91.1 x 61 x 72.25 in.
(2.3 x 1.5 x 1.8 m) | Up to 4,476 lbs (2,030 kg) (DHD60P2) |
| DHD90P3 | 125.1 x 61 x 72.25 in.
(3.2 x 1.5 x 1.8 m) | 6,464 lbs (2,932 kg) |
| DHD120P4 | 159.1 x 61 x 72.25 in.
(4 x 1.5 x 1.8 m) | 8,452 lbs (3,834 kg) |
| DHD150P5 | 193.1 x 61 x 72.25 in.
(4.9 x 1.5 x 1.8 M) | 10,440 lbs (4,735 kg) |
| Electrical Requirements5 (select one) | 208 to 240 V ±10%, 30, 3 or 4 wire, 50 to 60 Hz (PA cabinets) and 110 V, ±10%, 10, 50 to 60 Hz (control cabinet) |
| 480 V ±10%, 30, 3 or 4 wire, 50 to 60 Hz (PA cabinets) and 110 V, ±10%, 10, 50 to 60 Hz (control cabinet) | |
| Power Factor | 0.97, or better |
| Power Comsumption | ||||
| DHD8P1 | 12.7 kVA | DHD45P2 | 56.7 kVA | |
| DHD10P1 | 16.3 kVA | DHD60P2 | 75.3 kVA | |
| DHD15P1 | 20.5 kVA | DHD90P3 | 113.4 kVA | |
| DHD20P1 | 29.5 kVA | DHD120P4 | 150.5 kVA | |
| DHD30P1 | 38.8 kVA | DHD150P5 | 187.6 kVA | |
| Notes:
(1) After initial aging of 60 days. (2) Signal-to-noise ratio (modulation error ratio) measured with HP89440A/HP89441A vector signal analyzer. (3) Derate maximum temperature linearly, from 113° F (45° C) at sea level by 3.6° F (2° C) per 1,000 ft (305 m), up to 7,500 ft (2,286 m). For operation outside these limits, consult Harris. (4) For higher altitude operation, consult Harris. (5) For other AC voltages, consult Harris. (6) ±3Hz or better with external precision frequency control option. (7) Average power rating is power delivered at output of FCC mask filter. | ||||
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
