QUANTUM M Series
QEI QUANTUM M Series advanced technology FM Exciters are designed for outstanding audio performance. The QUANTUM M Series continues the tradition of superior performance and reliability set by its legendary predecessor the Model 695. QEI took this field-proven exciter design and has refined the system to deliver uncompromised performance, at an affordable price.
The QUANTUM M Series is an all solid-state, broadband FM exciter designed to exceed the FCC requirements for use in the FM broadcast band.
The QUANTUM M Series exciter is a frequency synthesized design, incorporating a dual speed phase locked loop, and may be programmed to operate on any 100 kHz increment in the FM band (10 kHz steps optional). Direct FM "On Carrier" operation insures spurious free transmission and extremely low distortion, crosstalk, noise, and no stereo degradation. The frequency-modulated oscillator (FMO) of the QUANTUM M Series has superior linearity and does not require any "pre-distortion" networks. Sound for sound the QUANTUM "M" Series will match other FM exciters costing twice as much or more. The FMO is sealed in steel and foam to shield it from stray magnetic fields and eliminate microphonics.
The Power Amplifier (PA) of the QUANTUM M Series is unconditionally stable and will withstand any magnitude or phase of VSWR indefinitely, without damage. The QUANTUM M Series power output can be varied from 2-Watts to greater the 20-Watts without oscillation or "break up". A 50-Watt version is also available. The QUANTUM M Series is designed with components that are operated conservatively and well within their ratings.
The QUANTUM M Series exciters are housed in a space saving 5-1/4-inch rack mounted chassis and are completely Download the
Official PDF Version self-contained.. The QUANTUM M Series can also be used as a replacement exciter for an older FM transmitter.
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. BNC for composite audio, barrier strip for monaural audio, and a Type N female for the RF output connector. Reliability and simplicity of design and operation make the QUANTUM M Series FM exciter an outstanding choice for every FM station.
A short list of features:
- Ultra Low Distortion, Crosstalk and Noise
- Modulation Monitoring
- Broadband Design
- Dual Speed Phase Locked Loop Design
- Frequency Synthesized
- Unconditionally Stable Amplifier, "VSWR Proof"
- Compact 5-1/4-inch rack mounted package
GENERAL
Power Output:
Model 20M:.......................................... 5 to 20 Watts
Model 50M:.......................................... 5 to 50 Watts
Frequency Range: 87.5 to 108 MHz (other frequencies optional)
RF Load Impedance:................................. 50 ohms
Output Connector:.......................... Type "N" Female
VSWR: Operation into any phase or magnitude at reduced output power
RF Harmonic/Spurious: Suppression meets or exceeds all FCC /DOC / CCIR specifications
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:............................................. 75µsec (FCC)
Optional:............................................. 50µsec (CCIR)
Asynchronous AM S/N Ratio (AM Noise): -60 dBc (no FM modulation present)
Synchronous AM S/N Ratio (Incidental AM): -55 dBc with 100 % FM Modulation
ELECTRICAL/MECHANICAL
AC Power:............... 105-125/210-250 VAC, 50/60Hz.
Power Consumption:
Model 20M:................................................ 50 Watts
Model 50M:............................................... 120 Watts
Ambient Temperature Range:
Operating:........................................ -15° C to +50° C
Startup:.............................................. 0° C to +50° C
Maximum Humidity:................. 95% non-condensing
Size: 5.25"H (13.35cm) x 19"W (48.25cm) x 18"D (45.7cm) Add 2.5" for Type N connector clearance
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 75 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 75 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
*Model QUANTUM M 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.