Quantum 1000E
1kW FM Transmitter
The QUANTUM 1000E establishes a new level in FM performance with the advantage of the highest power emergency back-up available in an exciter style package. QEI took the field-proven design of its exciters and merged them with a high power FET amplifier to deliver uncompromised performance as a transmitter or booster.
The QUANTUM 1000E is an all solid state, broadband, frequency synthesized, "on carrier" direct FM, phase locked, transmission system, designed to exceed the FCC requirements for use in the FM broadcast band.
The QUANTUM 1000E may be programmed to operate on any 100 kHz increment (10 kHz optional) in the FM band. Direct FM "on carrier" operation insures spurious free transmission and extremely low distortion, crosstalk, noise, and no stereo degradation. The frequency modulated oscillator (FMO) has superior linearity and does not require any "pre-distortion" networks to achieve high performance specifications. The FMO is sealed in a specially designed high Mu enclosure to shield it from stray magnetic fields and is acoustically dampened to eliminate microphonics. Sound for sound the QUANTUM "E" will match other FM exciter/transmitters costing twice as much or more.
The Power Amplifier (PA) of the QUANTUM 1000E is unconditionally stable and will withstand any magnitude or phase of VSWR indefinitely without damage by automatically reducing power. The conservatively designed power amplifier can be varied from a few Watts to full output without any oscillation or "break up".
The QUANTUM 1000E is comprised of exciter, amplifier and power supply and takes only 17-1/2" of rack space. The QUANTUM 1000E series when used as a replacement for the exciter and driver make a perfect upgrade for older systems. Complete metering of critical parameters is available at the push of a button. All operational indicators are LED's to eliminate all routine lamp replacement. RF and audio connections are made by way of back panel connectors. A BNC for composite audio and barrier strip for monaural audio are provided on each system. The QUANTUM 1000E uses a 7/8" (1-5/8"optional) EIA flanged connector for RF output and a female Type "N" connector for RF input from the exciter.
For use as a main or back-up transmitter, the reliability and simplicity of design and operation make the QUANTUM 1000E FM broadcast transmission system an outstanding choice for every FM station.
A Short List Of Features:
- Modular, Plug-In Solid-State FET Power Amplifiers
- "Automod" Automatic Modulation Control
- Modulation Monitoring With Peak Count
- Extensive Metering
- Spectrum Display Output
- Ultra Low Distortion, Crosstalk and Noise
- Frequency Synthesized
- Phase Locked
- "On-Carrier" Direct FM
- Stability +/-200 Hz (0º C to 50º C)
- Compact Rack Mount Package
QEI FM transmitters, designed and manufactured with pride in the U.S.A.
Technical Specifications
General
Power Output: 100 to 1000 Watts
Frequency Range: 87.5 to 108 MHz
RF Load Impedance: 50 ohms
Output Connector:
Standard 7/8" EIA Flanged
Optional 1-5/8" EIA Flanged
VSWR: 1.6:1 max. at full power (automatic 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
Standard Model: 695B
Optional Model: 695B-50
Frequency Stability: +/- 200 Hz from 00 to 50OC
Modulation Capability: Greater than +/- 350 kHz
Modulation Sensitivity vs. Temperature: 0.01 % per degree Centigrade
Modulation Measurement Displays:
Bar Graph Display: tri-color LED bar-graph continuously displays modulation
Precision Demod true Main channel modulation percentage can be read directly on exciter.
Peak Count modulation peaks per minute (that exceed your pre-set modulation level) are seen on the front panel LED display with "Automod" enabled.
Left and Right Channel (optional) a BNC jack on the front panel permits an optional stereo monitor to be connected to the transmitted baseband.
Occupied Bandwidth front panel BNC jacks allow a standard dual channel oscilliscope to become a Spectrum Analyzer for occupied bandwidth observation.
Multimeter Selection
Exciter: a full size meter measures eight key exciter parameters including: Mod (+), Mod (-), Mod (10%), PA Volts, PA Amps, IPA Amps, RF Fwd., RF Rev.
Amplifier: three independent meters measure vital amplifier parameters including; Drain Voltage, Drain Current, Regulated Voltage, Unregulated Voltage, RF Fwd., RF Rev.
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:
Exciter: 120/240 VAC 50/60Hz single phase. (DC input options available)
1000E Amplifier: 208/240 VAC 50/60Hz single phase. (DC input options available)
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
Size
Exciter: 5.25"H (13.35cm) x 19"W (48.25cm) x 19"D (48.25cm) note: add 2-1/2" for type "N" connector clearance.
1000E Amplifier: 12.25"H (13.35cm) x 19"W (48.25cm) x 18"D (48.25cm) note: add 4-3/4" (12.07cm) to depth for connector clearance if utilizing 90º elbow.
Monaural Performance
Input Impedance: 600 ohm balanced, 60 dB common mode suppression
Input Level: +10 dBm nominal for +/-75 kHz deviation at 400 Hz
CMMR: >60dB
Frequency Response: +/-0.5 dB, 30 Hz to15 kHz
THD+ N: 0.02 % or less 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: 10K ohm , nominal, resistive
Input Level: 3.5 VP-P nominal, 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 % or less at 400 Hz
Amplitude Response: +/-0.01 dB, 30 Hz to 75 kHz
Phase Response: +/-0.1 degrees from linear phase, 30 Hz to 75 kHz
Composite Slew Rate: 9 V/microsecond (symmetrical)
Stereo Performance*
Modulation Type: True numeric digital stereo generation, digitally generated pilot; no alignment required.
Frequency Response: +/-0.1 dB, 20 Hz to15 kHz
THD + N: 0.02 % or less 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: >60dB
Dynamic Stereo Separation: >60dB
Crosstalk:
(Linear) >60 dB
(Non-Linear)....... >60 dB
SCA Performance
Subcarrier Inputs: (3) total, unbalanced, BNC connectors
Subcarrier Input Impedance: 10K ohm, nominal, resistive
Subcarrier Input Level: 1.0 Vrms nominal for 10 % injection
Subcarrier Amplitude Response: +/-0.2 dB, 40 kHz to 100 kHz
* Quantum-Series performance is specified using listed exciter, 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