Sigma® CD
High-Power UHF ATSC Tube Transmitter
The Sigma® CD series of high-power UHF DTV transmitters utilizes inductive output tube (IOT) technology to deliver high efficiency and superior cost performance for ATSC broadcasters. Each Sigma CD system includes a control cabinet and one to four power amplifier (PA) cabinets. The control cabinet houses the system controller, exciter, monitoring and control panel/graphical user interface (GUI) and an optional second exciter.
An upgrade is now available for the Sigma CD transmitters that will allow them to provide IP-based control and monitoring by using the Harris® eCDi® performance monitoring 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™) technology for continuous automatic correction, ensuring optimum performance at all times
- Ultra-redundant design for unmatched reliability in a high-efficiency tube transmitter.
- “Diamond Drive” LDMOS IPAs, offering the ultimate in intermediate stage efficiency and linearity, and ensuring the best system performance. This amplifier, straight out of the Diamond CD® transmitter, is easily swapped and extremely reliable
- Independent, redundant design of power amplifier cabinets, allowing on-air maintenance in multiple-tube systems
- Automatic gain control (AGC) circuitry and high-speed Thyratron crowbar circuitry, providing superior protection for extended power amplifier life
- Reliable, distributed control architecture for outstanding reliability and simple serviceability
- Intuitive graphical user interface (GUI) for simple and easy control of the SigmaCD both locally and remotely
- Straightforward logic control, front-panel LED status indicators, and accessible design for simplified operation and maintenance
- Backed by broadcasting’s most extensive factory support, including 24-hour technical assistance, around-the-clock parts and comprehensive training
Images/Diagrams
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 | 4-1/16 in. flanged (at 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 |
| CD3070P1 | 70 kW peak,
15 kW average | CD3200P2 | 200 kW peak,
42 kW average |
| CD3100P1 | 100 kW peak,
21 kW average | CD3300P3 | 300 kW peak,
63 kW pverage |
| CD3140P2 | 140 kW peak,
30 kW average | CD3400P4 | 400 kW peak,
84 kW average |
| Stability of Output Power | ±2% or better |
| Frequency Stability (Pilot)2 | ±200 Hz/month, ±3 Hz or better with external precision frequency control option |
| Frequency Offsets | Per FCC requirements |
| SNR (MER)3 | ≥27 dB (>30 dB typical) |
| Harmonic and Spurious Radiation | Compliant with FCC requirements |
| Sideband Performance | Compliant with FCC mask, with optional Harris specified output filter |
| Service Conditions | |
| Ambient Temperature Range4 | 32 to 113° F (0 to 45° C) |
| Ambient Humidity Range | 0 to 90% relative humidity, non-condensing |
| Altitude5 | 0 to 7,500 ft. (2,286 m) AMSL |
Physical Dimensions
| Model | Transmitter
(W x D x H) | Beam Power Supply
(W x D x H) | Fan Unit
(W x D x H) | Pump Module
(W x D x H) | AC line Control
(W x D x H) |
| CD3070P1
CD3100P1 | 1 unit, each:
82 x 55 x 72 in. (2.1 x 1.4 x 1.8 m) 2425 lbs (1100 kg) | 1 unit, each:
46 x 56 x 62 in. (1.2 x 1.4 x 1.6 m) 3700 lbs (1678 kg) | 1 unit, each:
44 x 92 x 43 in. (1.1 x 2.3 x 1.1 m) 685 lbs (310 kg) | 1 unit, each:
36 x 62 x 66 in. (0.9 x 1.6 x 1.7 m) 800 lbs (363 kg) | 1 unit, each:
36 x 12 x 60 in. (0.9 x 0.3 x 1.5 m) 365 lbs (165 kg) |
| CD3140P2
CD3200P2 | 1 unit, each:
141 x 55 x 72 in. (3.6 x 1.4 x 1.8 m) 4525 lbs (2052 kg) | 2 units, each:
46 x 56 x 62 in. (1.2 x 1.4 x 1.6 m) 3700 lbs (1,678 kg) | 1 unit, each:
44 x 132 x 43 in. (1.1 x 3.3 x 1.1 m) 946 lbs (429 kg) | 1 unit, each:
36 x 62 x 66 in. (0.9 x 1.6 x 1.7 m) 800 lbs (363 kg) | 2 units, each:
36 x 12 x 60 in. (0.9 x 0.3 x 1.5 m) 365 lbs (165 kg) |
| CD3300P3 | 1 unit, each:
199 x 55 x 72 in. (5 x 1.4 x 1.8 m) 6625 lbs (3005 kg) | 3 units, each:
46 x 56 x 62 in. (1.2 x 1.4 x 1.6 m) 3700 lbs (1678 kg) | 1 unit, each:
44 x 172 x 43 in. (1.1 x 4.4 x 1.1 m) 1340 lbs (608 kg) | 1 unit, each:
36 x 62 x 66 in. (0.9 x 1.6 x 1.7 m) 800 lbs (363 kg) | 3 units, each:
36 x 12 x 60 in. (0.9 x 0.3 x 1.5 m) 365 lbs (165 kg) |
| CD3400P4 | 1 unit, each:
258 x 55 x 72 in. (6.5 x 1.4 x 1.8 m) 8725 lbs (3958 kg) | 4 units, each:
46 x 56 x 62 in. (1.2 x 1.4 x 1.6 m) 3700 lbs (1678 kg) | 2 units, each:
44 x 132 x 43 in. (1.1 x 3.3 x 1.1 m) 946 lbs (429 kg) | 2 units, each:
36 x 62 x 66 in. (0.9 x 1.6 x 1.7 m) 800 lbs (363 kg) | 4 units, each:
36 x 12 x 60 in. (0.9 x 0.3 x 1.5 m) 365 lbs (165 kg) |
| Electrical Requirements6 | 480 volts, ±2%, 3-phase, 3 or 4 wire, 60 Hz |
| Power Factor | 0.9, or better |
Power Consumption (typical, including cooling)
| CD3070P1 | 66 kW | CD3200P2 | 184 kW |
| CD3100P1 | 93 kW | CD3300P3 | 275 kW |
| CD3140P2 | 130 kW | CD3400P4 | 366 kW |
Notes:
1 Average power outputs are after FCC mask filter and typical RF combining systems, if present
2 After initial aging of 60 days
3 Signal-to-noise ratio (modulation error ratio) measured with HP89440A/HP89441A Vector Signal Analyzer
4 Derate maximum temperature linearly, from 45° C at sea level by 2° C per 1,000 ft. up to 7,500 ft. For operation outside these limits, consult Harris
5 For higher altitude operation, consult Harris
6 Other AC voltages available, consult Harris
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
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