QEI FMQ-20000B/30000B
Single Tube FM Transmitters
QEI FM Transmitters, are the very best. The FMQ-20000B and FMQ-30000B share a unique design that offers unequaled performance at any price. Conservatively designed for years of trouble free service, QEI FM Transmitters provide a superb broadcast signal. The FMQ-20000B and FMQ-30000B utilize an inherently broadband design that is totally transparent. The Intermediate Power Amplifier (IPA) design draws on decades of QEI experience in solid state FM transmitters. The IPA is joined to a single grounded grid triode for outstanding performance and stability. These elements have evolved into a transmitter unmatched for its quality and reliability.
QEI engineers designed the FMQ-20000B and FMQ-30000B to deliver what broadcasters need, RELIABILITY. Every step of the way QEI selected only the highest quality components. You can feel it in the smooth and precise control of the tuning and see it in the massive plate transformer. The FMQ Series are precision crafted to be the very best.
The all solid state modular IPA delivers plenty of drive to the final tube, allowing generous headroom to ensure the output power remains precisely at its pre-set level.
The FMQ-20000B and FMQ-30000B power amplifiers use a single triode in grounded grid service. The grounded grid triode design offers inherently greater stability, better performance and is less critical in operation than its tetrode counterparts since it requires no neutralization or additional energy consuming power supplies. QEI perfected this design by eliminating the need for conventional plate blockers and sliding contacts.
QEI pioneered single phase high power design and continues to dominate the industry by offering the option of single and three phase power on all FMQ-series transmitters.
Logically grouped metering and controls were clearly identified for the operator's convenience and a single panel shows total transmitter status at a glance. The remote control interface is easily connected to virtually all remote controls. With every FMQ-series transmitter a comprehensive spare parts kit is included at no charge. QEI FM transmitters are designed and manufactured with pride in the USA.
Technical Specifications
GENERAL
Power Output:
FMQ-20000B: 1100 to 22000 Watts
FMQ-30000B: 7500 to 30000 Watts
Frequency Range: 87.5 to 108 MHz (other frequencies optional)
RF Load Impedance: 50 ohms
Output Connector: 3 1/8" 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
Tube Complement:
FMQ-20000B single 3CX15000A7
FMQ-30000B single 3CX15000A7
Exciter:
QEI model 675 (standard)
QEI model 695 (optional)
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 60Hz three phase standard, single phase optional (tap range 198 to 250 VAC other line voltages and frequencies optional)
Power Consumption:
FMQ-20000B: 35 kW at 20000 Watts
FMQ-30000B: 50 kW at 30000 Watts
Ambient Temperature Range:
Operating: -15°C to +50°C
Startup: 0°C to +50°C
Maximum Altitude: 10,000 feet (3048m) AMSL
Maximum Humidity: 95% non-condensing
Make Up Air Requirements: (if exhaust stack is vented outside) FMQ-20000B/30000B 1000 CFM
RF Cabinet Size: (overall dimension) 23"W (59 cm) X 37"D (94cm) X 76"H (193cm)
AC Cabinet Size: (overall dimension) 23"W (59 cm) X 37"D (94cm) X 76"H (193cm)
Cabinet Weights:
RF Cabinet 950 Lbs. (435 kg)
AC Cabinet 1250 Lbs. (567 kg)
MODULATION PERFORMANCE
Since QEI's FMQ-Series grounded grid design provides the widest bandwidth available in a tube final, modulation specifications are exciter and stereo generator dependent. For optimum performance, QEI recommends the use of a QEI exciter and stereo generator which are optimized for system performance. See the appropriate exciter and stereo generator specification sheet for detailed wideband composite, monaural and stereo performance specifications.