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Crown Broadcast FM30T

30-Watt Transmitter With Processor And Stereo Generator


Crown FM30T
Crown FM30TCrown FM30
More than just an FM exciter or amplifier, a Crown integrated FM transmitter system combines built-in audio processing and stereo generation in one rugged, compact unit. Each model provides excellent signal quality, ease of use, and economical long-term reliability with a variety of features including: quick set-up; built-in digital metering and diagnostics; 87-108 MHz user-selectable frequency range; 100/120 VAC, 220/240 VAC or DC operation. Reliable operation is a major design criterion. With Teflon circuit boards and copper heat spreaders in the RF chain, the unit functions with less heat and improved life span. A unique Automatic Level Compensation (ALC) circuit protects the unit from voltage, temperature and VSWR variations. If operating parameters move outside the safe operating range, the ALC automatically reduces output power to safe limits until normal conditions are restored. All Crown units feature a 3-year warranty.

To see the owners manual for the Crown FM 30, click on this Crown FM30 / FM150 / FM300 Owners Manual.


Frequency Range : 87 to 108MHz (Japanese frequency available 74-90MHz as an option) Front panel agile

RF Power : 3 to 30 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 –65 dB (75 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 48 VDC (48V required for full output)

Power Consumption : 100VA

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 : 25 pounds (11.3 Kg) shipping weight = 33 Pounds (14.9 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

Monaural operation w/ built in Audio Processor

Audio Input impedance : 50 Kohms bridging, balanced

Audio Input level : 3.8 Vp-p for +/-75KHz deviation

Audio Frequency response : Conforms to 75uS pre-emphasis curve for +/- 0.25 dB from 50Hz to 15KHz

Pre-emphasis : Selectable 50, 75 uS or flat

Stereo Operation w/ built in Audio Processor and Stereo Generator

Audio Input impedance : 50 Kohms bridging, balanced

Audio Input level : -10 dBm to +10 dBm selectable for 75KHz deviation @400Hz

Frequency response : +/- 0.3 dB from 50Hz to 10KHz, +/- 1.0dB from 10Hz to 15KHZ T

otal Harmonic distortion + Noise :
0.4% or less @ 15KHz (0.2 typical)

Stereo Separation : Better than 40 dB from 50Hz to 15KHz

Linear Cross Talk : Main to sub and sub to main, -40 dB or better from 50 Hz to 15 KHz

38 KHz Sub-carrier suppression : >60dB

Pilot Stability : +/-.5 Hz @ 9% modulation

*Please consult a broadcast engineer to determine if this unit is right for your application and you are meeting all of the appropriate legal requirements. You can review the FCC regulations on LPFM and unlicensed usage below.

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