RF Carrier Output Power (A3E)

(420C-500 kW/419G-300 kW) on all frequencies through the 3.90 to 26.1 MHz range.

Reduced RF Carrier Output power (A3E)

The Type 419G/420C Transmitter can be operated at any power level between 45/75 (with slight reduction in overall efficiency) and 300/500 kW with the controls provided.

RF Output Power (H3E and R3E)

420C - 1000 kW PEP Two-Tone, 1500 kW PEP Program Modulation; 419G - 600 kW PEP Two-Tone, 800 kW PEP Program Modulation.

Frequency Range

3.90 to 26.1 MHz continuous in 100 Hz increments.

Tuning Time

An average of 10 typical frequency changes take less than 25 seconds each.

Standing Wave Ratio

2.0:1 VSWR at full power.

Output Impedance

300 ohms balanced or 75 ohms or 50 ohms unbalanced.

Modes of Emission

A3E or H3E and R3E.

Modulation Method

High efficiency solid state step modulator.

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.

Controlled Carrier Modulation Capability (CCM)

The Type 419G/420C Transmitter has the capability of operating in a controlled carrier modulation mode.  This is an amplitude modulation technique that scales the amplitude of the carrier to the percentage of modulation. In typical modulation applications, the carrier can be reduced as much as 6 dB below the rated value.  This feature can be a major cost saving to the user.

Single Sideband Operation (H3E and R3E) (OPTIONAL)

Single Sideband (SSB) operation is provided using a phase-amplitude method of generating the single sideband signal.  This provides high quality SSB operation with greater efficiencies than a linear amplifier can provide.

RF Spurious Noise

Less than 50 MW.  Out of band emissions in compliance with CCIR 328-5.

RF Harmonic Outputs

Less than 50 MW.

Audio Response (A3E)

+/-1 dB from 50 Hz to 7,500 Hz at 70% modulation or any lower modulation level.

Audio Response (H3E and R3E)

+/-1 dB 100 Hz to 4,500 Hz at any level up to the average power capability.

Audio Harmonic Distortion (A3E)

Less than 3.5% at 90% modulation from 50 to 7500 Hz.

Audio Harmonic Distortion (H3E and R3E)

Less than 3.5% at full average power capability from 100 to 4500 Hz.

Intermodulation Distortion (H3E and R3E)

At least -35 dB relative to either tone of a two-tone test signal.

Carrier Reduction (H3E and R3E)

-6 dB to -24 dB relative to two-tone PEP output, adjustable in 3 dB steps.

Audio Input Requirements

Adjustable from -8 dBm to +10 dBm.

Audio Input Impedance

600 ohms balanced, or 10K balanced.

Carrier Level Shift

Less than or equal to +/-3% shift at 100% tone modulation with 1000 Hz sinewave exclusive of power line variations.

Carrier Noise

-56 dB unweighted referenced to 100% modulation with a 1000 Hz tone.

Power Source

4160 Vac, or 11,000 Vac, 3 phase, three wire, 50/60 Hz.  Other voltages may be accommodated on special order.  Main power requirement is 650/1200 kW with a 100% tone modulation condition and equal to or greater than 0.95 lagging power factor.

Efficiency

The overall efficiency of the Type 419G/420C 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 71/73% with any depth of modulation.  Overall efficiency of 73/75% is expected during cool weather conditions and at the lower RF frequencies.

Ambient Temperature

+5  Centigrade, indoors°to +45

-10  Centigrade, outdoors°to +45

Altitude

Up to 2000 meters above sea level.  Higher altitudes may be accommodated on special order.

Relative Humidity

0 to 95%, non-condensing relative humidity.

Cooling

Water, water-vapor, and air cooling is employed.  All necessary cooling is an integral part of the Type 419G/420C Transmitter.  Demineralized water requirements are one gallon per day or less.  No discrete air ducting is required.