Crown Broadcast FM300E
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Crown Broadcast FM300E

300-Watt FM Exciter - Composite Input Only


The FM300E is an economical stand-alone 300W FM transmitter that delivers a high level of performance. It is a basic exciter with composite input only.

Featuring low loss circuit boards and copper heat spreaders in the RF chain, it functions with less heat and improved life span. A robust power supply with switching voltage and power regulators for AC or DC operation let you use it anywhere power can be generated.

Crown FM300E Features:
• Basic exciter with composite input
• Frequency Agile from front panel
• SWR metering from remote control
• Ability to control output power from remote control
• 3-Year warranty
• 24-hour service support
• Meets or exceeds all FCC requirements

Frequency Range 87 to 108MHz (Japanese frequency available 74-90MHz as an option) Front panel agile
RF Power 30 to 300 watts with front panel adjustment
RF Output Impedance 50 Ohms unbalanced
VSWR 1.7:1 Maximum with automatic foldback at higher VSWR
Frequency Stability Better than +/- .1KHz over operating temperature range
Modulation Type Direct Frequency Modulation of Carrier
Modulation Indication LED Indicators with Peak indicators
FM S/N Ratio (FM noise) Better than 60 dB (70 to 80 dB typical)
Asynchronous AM S/N Ratio Better than 50 dB referenced to 100% modulation @ 100 Hz, no de-emphasis.
Synchronous AM S/N Ratio Better than 50 dB with 100% modulation @ 100 Hz, no de-emphasis (typical >60dB)
RF Harmonics/Spurious Products Better than –70 dB (80 dB typical)
RF Bandwidth +/- 120 KHz, better than –35 dB; +/- 240 KHz better than –45 dB
Temperature 0 to 50 degrees C
Humidity 0 to 80% @ 20 degrees C (non-condensing)
Maximum Altitude 10,000 ft (3,000 m)
AC power 100 to 120 or 220 to 240 volts AC +/- 10%, 50 to 60 Hz
Power factor Greater than 97% (lagging)
DC Power 36 to 72 VDC (72V required for full output)
Power Consumption 700VA
Regulatory Notification for FCC part 73 and 74 Meets FCC requirements
RF Output connector Standard type N, 50 Ohm
Chassis dimensions 5.25 x 16.5 x 17.5 inches (13.4 x 41.9 x 44.5 cm) exclusive of rack mounts but inclusive of connectors
Weight 33 pounds (14.9 Kg) shipping weight = 41 Pounds (18.6 Kg)
Wide Band composite operation
Composite Inputs 1
Composite Input level 3.8 Vp-p for +/-75KHz deviation
Composite total harmonic distortion + noise < 0.05% from 50Hz to 15 Hz (0.03 typical)
Sub-carrier inputs 3
Sub-carrier input level 3.8 Vp-p for +/-75KHz deviation
Sub-carrier amplitude response +/-0.3 dB from 40Hz to 100kHz

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