Broadcast Electronics

Broadcast Electronics

Registered User Login
Chinese
English
Portuguese
Spanish
Support

Technical Specifications

 

FMi 73 - Technical Specifications

Aug 21, 2014

RF Specs

Output Power:
Range:
HD Radio only100 W to 280 W (-20 dB HD signal injection ratio)
FM + HD Radio300 W to 700 W (-20 dB HD signal injection ratio)
ExciterBroadcast Electronics FXi 60 digital FM/HD exciter
PA Efficiency:
HD Radio Only40% or better at rated power
FM+HD Radio50% or better at rated power
Overall AC Efficiency:
HD Radio only20% or better at rated power
FM + HD Radio40% or better at rated power
Frequency:
Range87.5 MHz to 108 MHz, programmable in 10 kHz steps
Stability±150Hz, -10°C to +50°C using high accuracy internal oscillator. 10MHz and 1pps input for synchronization to external (GPS) reference. Automatic switching to internal oscillator if external reference fails.
VSWRRated power into 1.5:1 VSWR, capable of operating in to higher VSWR with automatic power reduction, open and short circuit protected at all phase angles
RF Harmonics SuppressionInternal harmonic filter meets or exceeds all FCC, IC, CE, CCIR and IEC215 requirements. Meets or exceeds standard NRSC-5A emission limits in all operating modes.
Modulation TypeFM digitally synthesized direct to channel, HD digital direct to channel, FM + HD Radio digital direct to channel.
Operation ModesOn the fly mode switching between FM only, FM + HD Radio, and HD Radio only.
FM Modulation CapabilityGreat than ±300 kHz
Synchronous AM S/N Ratio58dB minimum below equivalent 100% amplitude modulation with 75us de-emphasis and 400Hz high pass filter (FM deviation +/- 75kHz by a 400Hz sine wave). 65dB typical below equivalent 100% amplitude modulation with 75us de-emphasis and 400Hz high pass filter (FM deviation +/- 75kHz by a 400Hz sine wave).
Asynchronous AM S/N Ratio68dB minimum below equivalent 100% amplitude modulation by 400Hz using 75us de-emphasis (no FM modulation present). 76dB minimum below equivalent 100% amplitude modulation by 400Hz using 75us de-emphasis (no FM modulation present).
Impedance50 ohm
RegulatoryMeets or exceeds all FCC requirements

Audio Specifications with FXi 60 Digital Exciter

ModesStereo, mono (L+R), L only, R only; remote selectable
Stereo Performance (AESor analog inputs):
Pre-EmphasisSelectable None, 50 or 75 microseconds
Stereo Pilot Tone19kHz ±.03Hz; injection level adjustable 0% to 15% in 0.1% steps; Nominal: 9%; Suppression: 38kHz, 57kHz, 76kHz, and 95kHz; 80dB below ±75kHz deviation.
Stereo Separation65dB or better, 20 to 15kHz
Dynamic Stereo Seperation65dB or better, 20 to 15kHz
Amplitude Response0.1dB, 20Hz to 15kHz
Signal to Noise Ratio87dB or better below 100% modulation at 400Hz; measured in a 20Hz to 22kHz bandwidth with 75us de-emphasis and DIN “A” weighting.
Total Harmonic Distortion<.03%; 20Hz to 15kHz, in bandwidth 20Hz to 22kHz; with 75us de-emphasis
Intermodulation Distortion:
CCIF<.03% or less (14/15kHz 1:1)
SMPTE<.03%(60 and 7kHz 1:1)
Transient Intermodulation Dist<.03%; (2.96kHz square wave/14kHz sinewave modulation)
Linear Crosstalk90 dB below 100% modulation reference
Non-Linear Crosstalk80 dB below 100% modulation reference
Audio Overshoot<.2dB
Mono Performance (AES or analog input):
Pre-EmphasisSelectable None, 50 or 75 microseconds
FM Signal to Noise Ratio95dB or better below 100% modulation at 400Hz; measured in a 20Hz to 22kHz bandwidth with 75us de-emphasis and DIN “A” weighting.
Amplitude Response±.1dB, referenced to selected pre-emphasis curve.
Intermodulation Distortion:
CCIF.03% or less (14/15kHz 1:1)
SMPTE.03% or less (60/7kHz 1:1)
Transient Intermodulation Dist.03% or less (2.96kHz square wave/14kHz sine wave)
Composite Analog Input:
FM Signal to Noise Ratio95dB or better below 100% modulation at 400Hz; measured in a 20Hz to 22kHz bandwidth with 75us de-emphasis and DIN “A” weighting.
Amplitude Response±.01dB, 20Hz to 53kHz; ±.1dB, 53kHz to 100kHz
Total Harmonic Distortion .005% or less over stereo sub band (10Hz to 53kHz) with 75us de-emphasis.
Intermodulation Distortion:
CCIF .005% or less (14/15kHz 1:1)
SMPTE.005% or less (60/7kHz 1:1)
Transient Intermodulation Dist.005% or less (2.96kHz square wave/14kHz sine wave)
Slew Rate11.8V/us-symmetrical
Phase Response Variation±.05° from linear phase, 10Hz to 100kHz
Group Delay Variation±5ns, 22Hz to 53kHz, ±30ns, 53kHz to 100kHz.
External SCA, RBDS Performance:
SCA FormatExternally generated, analog FM subcarriers in the range 53-99kHz.
SCA Sub-band Amplitude Response±.5dB; 40kHz to 100kHz.
SCA Channel FM Signal to Noise Ratio80dB below +6kHz subcarrier deviation at 400Hz with 150us de-empahasis.
Harmonic DistortionLess than .2% in audio pass-band of SCA generator
Intermodulation DistortionSMPTE(60 and 7kHz, 1:1): 0.2% or less, no pre/de-emphasis, SCA generator low-pass filter bypassed.
Crosstalk:
SCA to Stereo80dB below 100% modulation, L or R channel with 75us de-emphasis.
Stereo to SCA80dB below 100% modulation referenced to ±6kHz deviation and 150us de-emphasis
SCA to SCA80dB below 100% modulation referenced to ±6kHz deviation and 150us de-emphasis per channel.
Dual Internal SCA Performance:
Pre-EmphasisSelectable: 150us, 75us, 50us, none
Amplitude Response±.5dB; 20Hz to 7kHz.
Subcarrier Frequency57kHz to 99kHz
Signal to Noise Ratio80dB with de-emphasis(150us).
Total Harmonic Distortion .1% 10Hz to 5kHz
SCA Deviation Capability1kHz to 10 kHz; software programmable.
Injection Level2% to 15%, software adjustable in 0.1% increments
Spurious & Harmonic:
2nd HarmonicBetter than 40dB below subcarrier
3rd HarmonicBetter than 45dB below subcarrier
All other components50Hz to 100kHz: better than 80dB below subcarrier.
RBDS Generator (Internal):
Subcarrier Frequency57kHz, ±0.1Hz
Injection Level2% to 15%, software adjustable.

Mechanical/Physical

Size19"W x 25"D x 21"H (48.3 W x 63.5 D x 53.3 H cm) 12RU for amplifier + 4RU for exciter.
Weight103 lbs (46.8 kg)
Heat Dissipation:
HD Radio Only1100 watts (3755BTU/Hr) @ 300 watts RF output
FM + HD Radio1000 watts (3413 BTU/Hr) @ 700 watts RF output
RF Output ConnectorType N Connector, Female

Environmental

Ambient Temperature Range+32°F to +122°F (0°C to 50°C)
AltitudeTo 10,000 feet (3050m) elevation above mean sea level, 60Hz operation; To 7500 feet (2286m) elevation above mean sea level, 50Hz operation
HumidityTo 95% Non-Condensing

Electrical

AC Input VoltageSingle Phase: 196 to 252 VAC, 47-63 Hz
Power Factor .99 or better at 230 VAC
Current Draw:
HD Radio Only4.5 amps
FM+HD Radio11 amps
AC Power Consumption:
HD Radio Only1400 watts @ 300 watts RF output
FM + HD Radio1700 watts @ 700 watts RF output

All Specifications Subject to Change Without Notice


Click to Download Technical Specs (PDF)

Related Products

FMi 73  

 

Contact Us

 

phone: +1 217.224.9600

email: