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Technical Specifications

 

FM 3C - Technical Specifications

Nov 24, 2017

RF Specs

Output Power:
Range750 W to 3 kW
Accuracy10%
Resolution10 W
PA Efficiency81% typical at 3 kW (actual dependent on line voltage and carrier frequency)
Overall AC Efficiency50% or Greater. 64% or greater typical at 3 kW (actual dependent on line voltage and carrier frequency)
VSWRRated power into 1.5:1 maximum, capable of operating into higher VSWR with automatic power reduction, open and short circuit protected at all phase angles
Impedance50 Ohm
Frequency:
Range87.5 MHz to 108 MHz, tuned to specific operating frequency, exciter programmable in 10 kHz steps
Stability±300 Hz, 0° to 50° C
RF Harmonics SuppressionSuppression meets all FCC/DOC requirements and CCIR recommendations
Modulation:
TypeDirect frequency modulation of carrier frequency
CapabilitiesGreater than ±350 kHz
RegulatoryMeets IEC 215 safety requirements

FM Audio Specifications with FXi 250 Exciter

ModesStereo, mono (L+R), L only, R only
Stereo:
Connector Type:
AESWire – XLR, Optical – Toshiba (TosLink)
L&RXLR
Input Level:
AES-2 dBfs for 100% modulation; 16-24 bits (32, 44.1, 48 or 96 kHz typical rates for AES/EBU devices)
L&R+10 dBm for 100% modulation into 600 Ohm
Impedance:
AES110 Ohm balanced
L&R600 Ohm or 10 k Ohm selectable; balanced
Amplitude Response:
AES±0.5 dB, 20 Hz to 15 kHz
L&R±0.5 dB, 20 Hz to 15 kHz
THD + Noise:
AES0.05% or better
L&R0.05% or better
Intermod Dist:
AES0.05% or better
L&R0.05% or better
S/N Radio:
AES82 dB or better below 100% modulation @ 400 Hz
L&R82 dB or better below 100% modulation @ 400 Hz
Separation:
AES50 dB, 20 Hz to 15 kHz
L&R50 dB, 20 Hz to 15 kHz
Linear Crosstalk45 dB below 100% modulation; 20 Hz to 15 kHz; main to sub and sub to main
Pilot Stability±0.3 Hz, 0º C to 50º C
38, 57, 76, 95 kHz Suppression80 dB below 100% modulation
Asychronous AM S/N Ratio55 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with no FM modulation present
Synchronous AM S/N Ratio50 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with FM modulation ±75 kHz at 400 Hz
Pre-emphasisNone, 50 μs, or 75 μs; software programmable
Composite:
Connector TypeBNC (2); unbalanced, balanced
Input Level3.5 V p-p for 100% modulation into 10 k Ohm
ImpedanceBalanced: 10 k Ohm or 50 Ohm selectable, Unbalanced: 10 k Ohm
Amplitude Response±0.01 dB 20 Hz to 53 kHz; 0.1 dB 53 kHz to 99 kHz
Phase Response±0.1º from linear phase; 53 kHz to 100 kHz
THD + Noise0.02% or less
Intermod Dist0.02% or less
S/N Radio85 dB below 100% modulation @ 400 Hz
Asychronous AM S/N Ratio55 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with no FM modulation present
Synchronous AM S/N Ratio50 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with FM modulation ±75 kHz at 400 Hz
Mono:
Connector TypeXLR
Input Level3.5 V p-p for 100% modulation into 600 Ohm
Impedance600 Ohm or 10 k Ohm selectable
Amplitude Response±0.5 dB; 20 Hz to 15 kHz
THD + Noise0.02% or less; 20 Hz to 15 kHz
Intermod Dist0.02% or less, 20 Hz to 15 kHz
S/N Radio85 dB below 100% modulation @ 400 Hz
Asychronous AM S/N Ratio55 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with no FM modulation present
Synchronous AM S/N Ratio50 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with FM modulation ±75 kHz at 400 Hz
SCA:
Internal:
Input Level+10 dB for 10% modulation into 600 Ohm
Impedance600 Ohm or 10 k Ohm selectable
Amplitude Response±0.5 dB; 20 Hz to 7 kHz
S/N Ratio60 dB or better
Frequency20 kHz to 99 kHz; software programmable
Deviation2.5 to 10 kHz; software programmable
Injection Level2% to 15%; software programmable
External:
Connector TypeBNC
Input Level3.5 V p-p for 10% deviation
Impedance10 k Ohm unbalanced
Amplitude Response±0.5 dB; 20 Hz to 100 kHz
RDS:
Internal:
Frequency57 kHz
Injection Level2% to 15%; software programmable
External:
Connector TypeBNC
Input Level3.5 V p-p for 10% deviation
Impedance10 k Ohm unbalanced
Amplitude Response±0.5 dB; 20 Hz to 100 kHz
19 kHz19 kHz synchronization clock for external RBDS/RDS operation 2.5 V p-p into 50 Ohm

FM Audio Specifications with FX 100C Exciter

Composite:
Connector TypeBNC (3); un-balanced, balanced, front panel test
Input Level3.5 V p-p nominal, for ±75 kHz deviation
ImpedanceUnbalanced: 10 k Ohm, nominal, resistive. Balanced: 10 k Ohm or 50 Ohm, programmable, jumper selected
Amplitude Response±0.1 dB, 30 Hz to 53 kHz
Phase Response±0.25 degree from linear phase, 30 Hz to 53 kHz
THD + Noise0.02% or less
Intermod Dist0.02% or less
S/N Radio85 dB below 100% modulation @ 400 Hz
Asychronous AM S/N Ratio55 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with no FM modulation present
Synchronous AM S/N Ratio50 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with FM modulation ±75 kHz at 400 Hz
Mono:
Connector TypeTerminal Block
Input Level+10 dBm nominal for ±75 kHz deviation @ 400 Hz, adaptable to other levels
Impedance600 Ohm balanced, resistive, adaptable to other impedances, 60 dB common mode suppression
Amplitude Response±0.5 dB, 30 Hz to 15 kHz; selectable flat, 25, 50, or 75 μs pre-emphasis
THD + Noise0.02% or less
Intermod Dist0.02% or less
S/N Radio85 dB below 100% modulation @ 400 Hz
Asychronous AM S/N Ratio55 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with no FM modulation present
Synchronous AM S/N Ratio50 dB below rated power reference carrier with 100% AM modulation at 400 Hz, 75 μs de-emphasis with FM modulation ±75 kHz at 400 Hz
SCA:
External:
Connector TypeBNC (3); un-balanced
Input Level3.5 V p-p nominal for 7.5 kHz deviation
Impedance100 k Ohm nominal, resistive
Amplitude Response±0.2 dB, 40 kHz to 100 kHz

Mechanical/Physical

Size:
Transmitter19" W x 42" H x 28.5" D (48.3cm W x 106.68cm H x 72.39cm D)
Exciter19" W x 7" H x 24" D (48.3cm W x 17.78cm H x 60.96cm D)
Weight:
Transmitter260 lbs (117.9 kg)
Exciter38 lbs (17.2 kg)
Airflow:
Outlet Size500 square inches (3226 square cm); top of unit
RF Output Connector1-5/8” EIA flange

Environmental

Temperature Range0 degrees C to +50 degrees C
Altitude7500 ft. (2286 M) @ 50 Hz; 10,000 ft. (3048 M) @ 60 Hz
Humidity0-95% Non-Condensing

Electrical

AC Input Voltage195-252 VAC, 50/60 Hz, single phase
Disconnect Size60 A
AC Wire Size#4 Copper AWG, Type THHN
Current Draw35 A Max
Power Consumption6 kW at 3 kW RF Output into 50 Ohm load
Cooling Air Requirements1400 CFM (39.7 M3/min) filter required
Heat Dissipation3 kW at 3 kW RF Output into 50 Ohm load
BTU10250 BTU/H at 3 kW RF Ouptut into 50 Ohm load
Power Factor0.99 at full load
Surge Protection275 V MOV

All Specifications Subject to Change Without Notice


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