Quantum Series 6.0 to 9.6 kW
Solid-State FM Broadcast Transmitters
QEI Solid State FM Transmitters, precision crafted to be the very best. Designed for years of trouble free service, the totally solid state QUANTUM Series of FM transmitters, provide an unsurpassed broadcast signal. The QUANTUM Series of 6.0 to 9.6 kilowatt transmitters offer the FM broadcaster the benefits of QEI's unequaled background in FM solid state performance and reliability. QEI developed the QUANTUM Series utilizing decades of real-world field proven experience in solid state FM transmitter design. This completely solid state design offers significant savings by eliminating tube replacement costs associated with conventional transmitters. The QUANTUM Series offers high efficiency resulting in additional savings in power consumption and reduced heat loads.
For about the same price as tube transmitters, you can now own one of QEI's QUANTUM Series solid state transmitters and gain the maximum performance advantage.
The QUANTUM Series of transmitters feature modular power amplifiers and are available in power levels between 6.0 and 9.6 kilowatts in 1200 Watt increments. You can buy precisely the amount of power you need. This makes the QUANTUM Seriesof transmitters affordable to own and operate by avoiding the inefficiency of running a higher power transmitter at low output power levels.
By using modern CAD techniques and Computer Assisted Manufacturing (CAM), QEI has produced an internal modular system that is unrivaled for its ease of maintenance and upgrade ability. Yet even in this package, the QUANTUM Series house the exciter/driver, FET power amplifier modules, output combiner, power supplies and harmonic filter/directional coupler assemblies in one unit.
QEI engineers designed the QUANTUM Series to deliver what broadcasters need... RELIABILITY. Every step of the way QEI selected only the highest quality components. You can feel it in the ergonomically placed controls and metering, and see it in the attention to detail on the FET power amplifier modules. The QUANTUM Series are expertly crafted to be the best broadcast transmitters available in the world today!
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The QUANTUM Exciter was specifically designed with the needs of a high power solid state transmitter. No other transmitter manufacturer has taken such care in the development of the entire transmitter/exciter package. QEI developed the first truly linear frequency modulated oscillator (FMO) over 20 years ago with our best selling Model 675 exciter. The QUANTUM Exciter continues the tradition with our new Super-Linear FMO . This new advance in FMO technology is the secret to the QUANTUM Series transmitter's outstanding broadcast audio performance
The power amplifier modules are comprised of four FET's combined for 600 Watts of output power. Each module is fed by a self aligning connector to the high power state-of-the-art solid-state combiner . This 
provides reliable, low-loss matching and isolation of the power amplifiers. Filtered air positively pressurizes the cabinet eliminating dust infiltration. The power amplifier module compartment has multiple, super quiet fans for redundancy and to ensure even cooling of all modules.
QEI pioneered single phase high power transmitter design and continues to dominate the industry by manufacturing the QUANTUM Series with a single phase power supply.
QEI's QUANTUM Series of Solid-State FM Broadcast Transmitters are designed and manufactured with pride in the U.S.A.
Technical Specifications
General
Power Output:
QUANTUM 6.0: 1200 to 6000 Watts
QUANTUM 7.2: 1200 to 7200 Watts
QUANTUM 8.4: 1200 to 8400 Watts
QUANTUM 9.6: 1200 to 9600 Watts
Frequency Range: 87.5 to 108 MHz
RF Load Impedance: 50 ohms
Output Connector: 1-5/8" EIA flange (Other connectors are optional)
VSWR: 1.6:1 max. at full power (automatic arc suppression and power control for operation at reduced power into any phase or magnitude)
RF Harmonic/Spurious: Suppression meets or exceeds all FCC/DOC/CCIR specifications
Exciter: QEI QUANTUM 600E
Frequency Stability: +/- 200 Hz from 0°C to 50°C
Modulation Capability: Greater than +/- 350 kHz
Modulation Sensitivity vs. Temperature: 0.01 % per degree Centigrade
Pre-Emphasis:
Standard: 75usec (FCC)
Optional: 50usec (CCIR)
Asynchronous AM S/N Ratio (AM Noise): -55 dBc (no FM Modulation present)
Synchronous AM S/N Ratio (Incidental AM): -50 dBc with 100 % FM modulation
Electrical/Mechanical
AC Power requirement: 208/240 VAC
50/60Hz single phase (tap range 198 to 250 VAC other line voltages and frequencies optional)
Ambient Temperature Range:
Operating: -15°C to +50°C
Startup: 0°C to +50°C
Maximum Altitude: 10,000 feet AMSL
Maximum Humidity: 95% non-condensing
Cabinet Size: 24"W (61 cm) x 36"D (91cm) x 76"H (193cm)
Monaural Performance
Input Impedance: 600 Ohm balanced
CMMR: >60 dB
Input Level: +10 dBm nominal for 75 kHz deviation at 400 Hz
Frequency Response: +/-0.5 dB, 30 Hz to 15 kHz
THD+N: 0.02 % at 400 Hz
FM S/N Ratio: 80 dB below 75 kHz deviation at 400 Hz, measured in a 50 Hz to 15 kHz bandwidth with 75 usec de-emphasis
Wideband Composite Performance
Inputs: (1) unbalanced on rear panel, BNC connector
Input Impedance: 10 kOhm
Input Level: 3.5 VP-P for 75 kHz deviation
FM S/N Ratio: ...80 dB below 75 kHz deviation at 400 Hz, measured in a 50 Hz to 15 kHz bandwidth with 75 usec de-emphasis
THD+N: 0.02 % at 400 Hz
Amplitude Response: +/-0.01 dB, 20 Hz to 75 kHz
Phase Response: +/-0.1 degrees from linear phase, 20 Hz to 75 kHz
Composite Slew Rate: .9 V/microsecond (symmetrical)
Stereo Performance*
Frequency Response: +/-0.1 dB, 20 Hz to 15 kHz
THD+N: 0.02 % at 400 Hz
FM S/N Ratio: 80 dB below 75 kHz deviation at 400 Hz, measured in a 50 Hz to 15 kHz bandwidth with 75 usec de-emphasis
Stereo Separation: >60 dB
Dynamic Stereo Separation: >60 dB
Crosstalk (linear) >60dB
Crosstalk (non-linear) >60dB
SCA PERFORMANCE
Subcarrier Inputs: (3) total, unbalanced, BNC connectors
Subcarrier Input Impedance: 10 kOhm
Subcarrier Input Level: 1.0 Vrms, for 10 % injection
Subcarrier Amplitude Response: +/-0.2 dB, 40 kHz to 100 kHz
* QUANTUM Series performance is specified using model M-Exciter/driver, 710A digital stereo generator at rated transmitter power into a 50 ohm resistive load. Specifications are subject to change without notice. Since measurement techniques vary, care should be observed in comparing specifications of different manufacturers.