How The World Communicates

419H/420D-DRM 300/500kW
Shortwave Broadcast Transmitter
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Specifications-- 419H/420D-DRM Shortwave Broadcast Transmitter

Modes of Emission
A3E and DRM, Standard, SSB Optional
Modulation Method
High efficiency all-solid-state step modulator using EER for AM/PM Modes
Audio Input Requirements
Adjustable from -8 to +10 dBm for 100% AM modulation
Audio Input Impedance
600 ohms, balanced. Other impedances on special order

Audio Response (A3E)

+/-1 dB from 50 Hz to 5000 Hz at 70% modulation or modulation level. +1/-1.5 dB, 5000 ? 7500 Hz
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 Noise
-56 dB, unweighted, referenced to 100% modulation with a 1 kHz tone
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
100% sinusoidal modulation at frequencies from 50 to 7,500 Hz, for ten (10) minutes per hour. Up to 70% modulation on a continuous basis
RF Output Power (DRM)
150/250 kW RMS, 1200/2000 kW PEP with 9 dB Crest Factor
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
DRM Modes
All DRM 9 kHz and 10 kHz bandwidth modes are supported
MER (Modulation Error Rate)
-30 dB, or better
SSB Option
RF Output Power (H3E and R3E)
420D - 1000 kW PEP Two-Tone;
419H - 600 kW PEP Two-Tone
High Efficiency
H3E and R3E (LSB, USB and ISB) using EER (Envelope Elimination and Recovery)
Intermodulation Distortion (H3E& R3E)
At least -35 dB relative to either tone
of a two-tone test signal
Carrier Reduction (H3E & R3E)
-6 dB to -24 dB relative to full carrier or full Carrier suppression
RF Carrier Output Power (A3E)
(420D-500 kW/419H-300 kW) on all frequencies through the 3.90 to 26.1 MHZ range
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
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
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)
Frequency Range
3.9 - 22 MHz continuous in 100 Hz increments. 5.8?26.1 MHz, optional
Tuning Time
An average of 10 typical frequency changes takes less than 30 seconds each
Standing Wave Ratio
Rated for 2.0:1 VSWR at full power or any customer selected VSWR below 2:1
RF Output Impedance
300 ohms balanced (Standard);
50 or 75 ohms unbalanced Optional
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
RF Spurious
Less than 50 mW. Out of band emissions in compliance with CCIR 328-5
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)
Relative Humidity Range
0 to 95% relative humidity, non- condensing Altitude Up to 6,000 ft. (1,829 m) above sea level
Water, heat exchanger (supplied), and air cooling