QUANTUM MBB Series 2‑kW & 5-kW
QEI Solid State FM Transmitters, precision crafted to be the very best. Designed for years of trouble free service, the totally solid-state QUANTUM MBB-Series of broadband FM transmitters provides unsurpassed signal performance. The QUANTUM MBB-Series of 2 and 5 kilowatt transmitters offers the FM broadcaster the benefits of QEI's experience in designing broadband, solid-state FM RF amplifiers and combining systems. QEI developed the QUANTUM MBB-Series utilizing decades of real-world field experience in solid-state FM transmitter design. This completely solid-state design offers significant savings by eliminating tube replacement costs. The QUANTUM MBB-Series operate with 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 MBB-Series broadband solid-state transmitters and gain the maximum performance advantage. The QUANTUM MBB-Series of transmitters features modular power amplifiers and is available in power levels of 2 and 5 kilowatts. You can buy precisely the amount of power you need. This makes the QUANTUM MBB-Series of transmitters affordable to own and operate.
By using modern CAD techniques and computer assisted manufacturing, QEI has produced an internal modular system that is easy to maintain and allows the transmitter to be upgraded to a higher power level in the field. Yet even in this package, the QUANTUM MBB-Series houses the exciter, IPA, FET power amplifier modules, output combiner, power supplies and harmonic filter/directional coupler assemblies in one unit.
QEI designed the QUANTUM MBB-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 MBB-Series broadcast transmitters are expertly crafted to be the best available in the world today!
The power amplifier modules are comprised of two FET's combined for 500 Watts of broadband output power. A self-aligning connector Download the
Official PDF Versionfeeds each module to the high power combiner. This provides reliable, low-loss matching and isolation of the power amplifiers. This QEI exclusive design eliminates all trouble prone connections and high loss cabling. 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.
The QUANTUM 20M exciter is used in the Quantum M2BB and the Quantum 50M exciter is used in the Quantum M5BB. 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 20M continues the tradition with our new Super-Linear FMO. This new advance in FMO technology is the secret to the QUANTUM MBB-Series transmitter's superior sound.
QEI's QUANTUM MBB-Series of Solid-State FM Broadcast Transmitters are designed and manufactured in our New Jersey, U.S.A. facility.
Technical Specifications
GENERAL
Power Output:
QUANTUM M2BB:.............. 600 to 2000 Watts
QUANTUM M5BB:.............. 600 to 5000 Watts
Frequency Range: 87.5 to 108 MHz (other frequencies optional)
RF Flatness (87.5 to 108 MHz):........ +/- 1dB
RF Load Impedance:........................ 50 ohms
Output Connector:........ 1-5/8-inch EIA, male
VSWR: 1.6:1 maximum at full power (automatic power control provides for operation at reduced power into any phase or magnitude).
RF Harmonic/Spurious: Suppression meets or exceeds all FCC/DOC/CCIR specifications
Frequency Stability: ±200 Hz from 0° to 50° C.
Modulation Type:............................ Direct FM
Modulation Capability: Greater than ±350 kHz
Modulation Sensitivity vs. Temperature: 0.01% per degree Centigrade
Pre-Emphasis:
Standard:..................................... 75µsec (FCC)
Optional:..................................... 50µsec (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: 208/240 VAC, 60Hz, single or three phase (Tap range 198 to 250 VAC, other line voltages and frequencies are available)
Ambient Temperature Range:
Operating:................................ -15° C to +50° C
Startup:........................................ 0° C to +50° C
Maximum Humidity:.... 95% non-condensing
Maximum Altitude:............ 10,000 feet AMSL
Cabinet Size: 24" (61 cm) W x 34" (86 cm) D x 59" (149 cm) H
MONAURAL PERFORMANCE
Input Impedance:........... 600 ohms balanced
CMRR:.................................................... >60 dB
Input Level: +10 dBm for 75 kHz deviation at 100 Hz
Frequency Response: ±0.5 dB, 30 Hz to 15 kHz
THD+N:................................ 0.025% at 400 Hz
FM S/N Ratio:........ Greater than 75 dB below
75 kHz deviation at 400 Hz, measured in a 50 Hz to 15 kHz bandwidth with 75 µsec de-emphasis
WIDEBAND COMPOSITE PERFORMANCE
Inputs: (1) unbalanced on rear panel, BNC connector
Input Impedance:............................ 10K ohms
Input Level:....... 3.5 VP-P for 75 kHz deviation
FM S/N Ratio: Greater than 80 dB below 75 kHz deviation at 400 Hz, measured in a 50 Hz to 15 kHz bandwidth with 75 µsec de-emphasis
THD+N:................................ 0.025% at 400 Hz
Amplitude Response: ±0.01 dB, 30 Hz to 75 kHz
Composite Slew Rate: 9 v/µsec, symmetrical
Phase Response: ±0.1 degrees from linear phase, 30 Hz to 75 kHz
STEREO PERFORMANCE*
Frequency Response: ±0.1 dB, 30 Hz to 15 kHz
THD+N:................................ 0.025% at 400 Hz
FM S/N Ratio: Greater than 80 dB below 75 kHz deviation at 400 Hz, measured in a 50 Hz to 15 kHz bandwidth with 75 µsec de-emphasis
Stereo Separation:.............................. >60 dB
Dynamic Stereo Separation:............ >60 dB
Crosstalk (linear):................................ >60 dB
Crosstalk (non-linear):....................... >60 dB
SCA PERFORMANCE
Subcarrier Inputs: (3) total, unbalanced, BNC connectors
Subcarrier Input Impedance:....... 10K ohms
Subcarrier Input Level: 1.0 Vrms, nominal for 10% injection
Subcarrier Amplitude Response: ±0.2 dB, 40 kHz to 100 kHz
The QUANTUM MBB Series FM transmitters include a remote control interface compatible with all standard broadcast transmitter remote control systems.
*Model QUANTUM MBB Series performance is specified using 710A digital stereo generator at rated exciter power output into a 50 ohm resistive load.
Since measurement techniques vary, care should be observed in comparing specifications of different manufacturers.
QEI maintains an ongoing program of research and development to insure the finest product performance and quality.
All specifications are subject to change without notice.