CEC allows governments and organizations worldwide reach audiences at greater distances with the most reliable, longest-lasting, high powered shortwave transmitters in the field today. CEC’s turnkey 419 DRM/420 DRM Shortwave Transmitters are the most reliable, high-efficiency 300kW / 500kW DRM shortwave transmitters on the market. They are capable of being operated in AM, CCM or Digital Radio Mondiale (DRM) mode with digital streaming.
Advantages
Rugged, Reliable, & Field-Proven
User-friendly
Advanced DSP technology delivers Signal Processing, System Controls, and Monitoring
Easy to maintain
- Operates in standard amplitude modulation (AM), Controlled Carrier-level Modulation (CCM) or DRM mode with digital streaming.
- Manage transmitter from a master control panel or a remote computer.
- Ability to preset or automatically tune for full carrier power at any frequency between 3.9 and 22 MHz (3.9 – 26.1 MHz optional).
- Compact design includes all switchgear, power supplies, protective circuits, amplifiers, primary cooling and peripheral equipment.
Features
- 280 preset frequency channels with 30-second frequency switching intervals.
- Standard Frequency Range of 3.9 – 22 MHz (3.9 – 26.1 MHz optional).
- Computer-Assisted Touch Screen Control System and front panel button operation.
- TCP/IP Based Remote Control System allows unattended operation, enabling complete off-site control.
- 71 – 73 % overall average efficiency.
- DRM operation with standard optional DRM Encoder/ Exciter and all AM/ PM Modes.
- High-Efficiency Solid State Modulator and HV Power Supplies provide low stored energy protection without crowbar.
- Exclusive CCM (Controlled-Carrier level Modulation) allows carrier reduction from 0-6 dB in 1 dB steps.
- Self-Contained Water System for Primary Loop Cooling to external heat exchanger or facility water.
- External Dual Fan Heat Exchanger with Coated Coils and Epoxy Coated Enclosure for Corrosion Resistance.
- High-Speed Arc Sensors in all critical RF component areas.
SPECIFICATIONS
| ELECTRICAL | AUDIO | RF | DRM | ENVIRONMENT | SSB Option |
|---|---|---|---|---|---|
| RF Carrier Output Power (A3E): (420D-500 kW/419H-300 kW) on all frequencies through the 3.90 to 26.1 MHZ range | Modes of Emission: A3E and DRM, Standard, SSB Optional | Efficiency: The overall efficiency of the Type 419H/420D DRM Transmitter measured as an average of ten frequencies over the range of 3.9 - 26.1 MHz at 300/500 kW carrier power level will not be less than 71/75% with any depth of modulation. (Lower at lower power levels) | RF Output Power (DRM): 150/250 kW RMS, 1200/2000 kW PEP with 9 dB Crest Factor | Ambient Temperature Range: Indoors: +40 to +111 degrees F (+5 to +45 degrees C) Outdoors: +14 to +111 degrees F (-10 to +45 degrees C) | RF Output Power: (H3E and R3E) 200 kW PEP Two-Tone |
| Reduced RF Carrier Output Power (A3E): The Type 419H/420D DRM Transmitter can be operated at any power level between 45/75 and 300/500 kW with the controls provided | Modulation Method: High efficiency all-solid-state step modulator using EER for AM/PM Modes | Frequency Range: 3.9 - 22 MHz continuous in 100 Hz increments. 5.8?26.1 MHz, optional | DRM: Meets all IEC PAS62272-1 & ETSI REF.ES 201 980 V.1.2.1 2002-07 specifications See the exciter brochure for a full list of features. DMOD3 DRM Exciter is totally integrated into the transmitter | Relative Humidity Range: 0 to 95% relative humidity, non- condensing Altitude Up to 6,000 ft. (1,829 m) above sea level | High Efficiency: H3E and R3E (LSB, USB and ISB) using EER (Envelope Elimination and Restoration) |
| Power Source: 4160 VAC, or 11,000 VAC, 3 phase, three wire, 50/60 H;. other voltages on special order. Mains power requirement is 650/1200 kW with 100% tone modulation condition at ò 0.95 lagging power factor | Audio Input Requirements: Adjustable from -8 to +10 dBm for 100% AM modulation | Tuning Time: An average of 10 typical frequency changes takes less than 30 seconds each | DRM Modes: All DRM 9 kHz and 10 kHz bandwidth modes are supported. | Cooling: Water, heat exchanger (supplied), and air cooling | Intermodulation Distortion (H3E & R3E): At least -35 dB relative to either tone of a two-tone test signal |
| Audio Input Impedance: 600 ohms, balanced. Other impedances on special order | Standing Wave Ratio: Rated for 2.0:1 VSWR at full power or any customer selected VSWR below 2:1 | MER (Modulation Error Rate): -30 dB, or better | Carrier Reduction (H3E & R3E): -6 dB to -24 dB relative to full carrier or full Carrier suppression |
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| Audio Response (A3E): +/-1 dB from 50 Hz to 5000 Hz at 70% modulation or modulation level. +1/-1.5 dB, 5000 ? 7500 Hz | RF Output Impedance: 300 ohms balanced (Standard); 300 ohms balanced (Standard); 50 or 75 ohms unbalanced Optional | ||||
| Audio Harmonic Distortion (A3E): Less than 3.5% at 50-90% modulation from 50 to 7500 Hz; less than 4.5% at 90-100% | Carrier Level Shift (A3E): Less than or equal to +/-3% shift at 100% tone modulation with 1 kHz sine wave exclusive of power line variations | ||||
| Carrier Noise: -56 dB, unweighted, referenced to 100% modulation with a 1 kHz tone | RF Spurious: Less than 50 mW. Out of band emissions in compliance with CCIR 328-5 | ||||
| Controlled Carrier Level Modulation (CCM): The Type 419H/420D DRM Transmitter has the capability of operating with variable carrier power. This technique scales the amplitude of the carrier to the percentage of modulation. The carrier can be reduced as much as 6 dB below the rated value without audio distortion and can be a major cost saving to the user. | |||||
| Modulation Capability: The Type 419H/420D DRM Transmitter has the capability of operating with variable carrier power. This technique scales the amplitude of the carrier to the percentage of modulation. The carrier can be reduced as much as 6 dB below the rated value without audio distortion and can be a major cost saving to the user. |