RF Enables Communications

 
418F 100 kW Shortwave Broadcast Transmitter  
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Specifications-- 418F 100 kW Shortwave Broadcast Transmitter

Electrical

 

Audio

Modes of Emission
AM (A3E), SSB (h3E & R3E)
 
Modulation Method
High level plate modulation using high efficiency solid state modulator.
 
Modulation Capability
70% continuous; 100% sinusoidal modulation at audio frequencies from 50 to 7,500 Hz for up to 10 minutes per hour.
 
Controlled Carrier Level Modulation (CCM)
Capable of operating in CCM mode, a power saving modulation technique that allows scaling of the carrier amplitude to the modulation percentage, automatically reducing carrier level as much as 6 dB.
 
Harmonic and Spurious Radiation
Meets or exceeds FCC and CCIR requirements
 
Audio Response (A3E)
+/-0.5 dB from 50 to 4,500 Hz, +/-1 dB from 4,500 to 7,500 Hz at less than or equal to 70% modulation.
 
Audio Response (h3E & R3E)
+/-0.5 dB from 100 to 4,500 Hz at any level up to the average power capability.
 
Audio Harmonic Distortion (A3E)
<2% at 90% modulation from 50 to 4,500 Hz; 3% from 4,500 to 7,500 Hz.
 
Audio Harmonic Distortion (h3E & R3E)
<2% at 90% at full average power capability from 100 to 4,500 Hz.
 
Intermodulation Distortion (A3E, h3E & R3E)
At least -35 dB relative to either tone of a two-tone test signal.
 
Carrier Reduction (h3E & R3E)
-3 to -24 dB relative to PEP, adjustable in 3 dB steps.
 
Audio Input Requirements
Adjustable from -8 to +10 dBm for 100% modulation.
 
Audio Input Impedance
600 ohms or 10K ohms, balanced.
 
Carrier Level Shift (A3E)
Less than or equal to +/-3% shift at 100% tone modulation with 1 kHz sinewave exclusive of powerline variations.
 
Carrier Noise
-56 dB unweighted referenced to 100% modulation with a 1 kHz tone.
 
RF Carrier Output Power (A3E)
100 kW (400 kW PEP)
 
Reduced RF Carrier Output Power (A3E)
25 kW - 100 kW
 
RF Output Power 2-Tone (h3E)
200 kW PEP
 
RF Output Power Program (R3E)
300 kW PEP
 
RF Output Impedance
50 or 75 ohms unbalanced; 300 ohms balanced
(balun supplied with transmitter).
 
Standing Wave Ratio
2.0:1 VSWR at full power
 
Tuning Time
An average of 10 typical frequency changes take less than 25 seconds each.
 
Frequency Range
3.2-22 MHz continuous in 1 kHz increments, (2.3-16 MHz or 3.95-26.1 MHz optional ranges).
 
AC Power Source
Customer specified: 360-480 VAC, 50/60 Hz, 3-phase, other voltages available on request.
 
Efficiency
Greater than or equal to 70%
 
 
Mechanical
Weight
12,320 lbs. (5,587 kg) before packing
 
Size
192 in. (488 cm) wide, 60 in. (152 cm) deep, 85 in. (216 cm) high
 
 
Environment
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
 
Cooling
Water, heat exchanger (supplied), and air cooling