Quantum M-Series
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 M-Seriesof FM transmitters, provide an unsurpassed broadcast signal. The QUANTUM M-Seriesof 1.2 to 5.4 kilowatt transmitters offer the FM broadcaster the benefits of QEI's unequaled background in FM solid state performance and reliability. QEI developed the QUANTUM M-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 M-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 M-Series solid state transmitters and gain the maximum performance advantage.
The QUANTUM M-Series of transmitters features modular power amplifiers and is available in power levels between 1.2 and 5.4 kilowatts in 600 Watt increments. You can buy precisely the amount of power you need. This makes the QUANTUM M-Series of transmitters affordable to own and operate by avoiding the inefficiency of running a higher power transmitter at low output power levels.
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By using modern CAD techniques and Computer Assisted Manufacturing (CAM), QEI has reduced the size of the transmitter to less then 5 feet tall! Yet even in this small package, the QUANTUM M-Series houses 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 M-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 M-Series transmitters are expertly crafted to be the best broadcast transmitters available in the world today!
The QUANTUM M - 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 M continues the tradition with our new Super-Linear FMO. This new advance in FMO technology is the secret to the QUANTUM M-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 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 M-Series with a single phase power supply.
QEI's QUANTUM M-Series of Solid-State FM Broadcast Transmitters are designed and manufactured with pride in the U.S.A.
Technical Specifications
GENERAL
Power Output:
QUANTUM-M 1.2: 600 to 1200 Watts
QUANTUM-M 1.8: 600 to 1800 Watts
QUANTUM-M 2.4: 600 to 2400 Watts
QUANTUM-M 3.0: 600 to 3000 Watts
QUANTUM-M 3.6: 600 to 3600 Watts
QUANTUM-M 4.2: 600 to 4200 Watts
QUANTUM-M 4.8: 600 to 4800 Watts
QUANTUM-M 5.4: 600 to 5400 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 M-Series
Frequency Stability: +/- 200 Hz from 0 to 50C
Modulation Capability: Greater than +/- 350 kHz
Modulation Sensitivity vs. Temperature: 0.001 % 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 59"H (149cm)
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 20 Hz to 30 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 20 Hz to 30 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 20 Hz to 30 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 M-Series performance is specified using Quantum M Series Exciter, 710 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.