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simplicity • reliability • modularity • serviceability FM TRANSMITTERS Larcan USA • 1390 Overlook Drive • Lafayette, CO 80026 Phone: 303.665.8000 • Fax: 303.673.9900 • E-mail: [email protected] 5kW FM Transmitter An ISO 9001 Certified Facility EX2-250 250W Stereo Exciter/Driver 5kW FM Transmitter with dual exciter in 38U cabinet The 5kW offers the most affordable, field proven, reliable, solid state transmitter on the market. Its simplicity, and superior modular design make the 5K both easy & versatile to operate and maintain. The 5kW utilizes the EX2-250 250W Stereo Exciter as the driver. The EX2-250 provides the ultimate in audio performance to rival most digital exciters on the market today. The 5kW R.F Amplifier consists of 6 x 1kW wideband amplifiers. Each amplifier consists of 4 x 280W parallel amplifiers stages. The 6 x 1kW amplifiers are combined via a 6-way Wilkinson hybrid combiner, which provides adequate isolation between stages, to enable a 1kW module to be removed without interrupting service. Switching unit and telemetry interface are optional to provide remote and automatic control and fault monitoring. The system PSU is based on a linear supply, including a transformer and linear regulators to provide operation in un-stable mains environments. FEATURES - Superior audio performance - Dual or single exciter operation (dual optional) - Mosfet technology (6 x 1kW Mosfet amplifiers) - System control via RS485 telemetry interface (optional) - In-built transient suppression module (optional) - SCA and RDS Operation (standard) - Built-in forced air cooling system - Operation into cavity input or star point combiner (standard) 1kW R.F. Amplifiers including fans and wilkinson combiner and harmonic filter

FM TRANSMITTERS - Tech-Notes ·  · 2007-12-07FM TRANSMITTERS Larcan USA • 1390 Overlook Drive • Lafayette, CO 80026 Phone: ... EX2-250 250W Stereo Exciter/Driver 5kW FM Transmitter

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Page 1: FM TRANSMITTERS - Tech-Notes ·  · 2007-12-07FM TRANSMITTERS Larcan USA • 1390 Overlook Drive • Lafayette, CO 80026 Phone: ... EX2-250 250W Stereo Exciter/Driver 5kW FM Transmitter

s i m p l i c i t y • r e l i a b i l i t y • modu l ar i t y • s e r v i c e ab i l i t y

F M T R A N S M I T T E R S

Larcan USA • 1390 Overlook Dr ive • Lafayette , CO 80026Phone : 303.665.8000 • Fax : 303.673.9900 • E -ma il : [email protected]

5kW FM Transmitter

An ISO 9001 Cer t i f i ed Fac i l i t y

EX2-250 250W Stereo Exciter/Driver

5kW FM Transmitter with

dual exciter in 38U cabinet

The 5kW offers the most affordable, field proven, reliable, solid state transmitter on the market. Its simplicity, and superior modular design make the 5K both easy & versatile to operate and maintain.

The 5kW utilizes the EX2-250 250W Stereo Exciter as the driver. The EX2-250 provides the ultimate in audio performance to rival most digital exciters on the markettoday.

The 5kW R.F Amplifier consists of 6 x 1kW wideband amplifiers. Each amplifier consistsof 4 x 280W parallel amplifiers stages. The 6 x 1kW amplifiers are combined via a 6-way Wilkinson hybrid combiner, which provides adequate isolation between stages, to enable a 1kW module to be removed without interrupting service.

Switching unit and telemetry interface are optional to provideremote and automatic control and fault monitoring.

The system PSU is based on a linear supply, including a transformer and linear regulators to provide operation in un-stable mains environments.

FEATURES- Superior audio performance- Dual or single exciter operation (dual optional) - Mosfet technology (6 x 1kW Mosfet amplifiers)

- System control via RS485 telemetry interface (optional)

- In-built transient suppression module (optional)- SCA and RDS Operation (standard)- Built-in forced air cooling system- Operation into cavity input or star point combiner (standard)

1kW R.F. Amplifiers including fans and wilkinson combiner and harmonic filter

Page 2: FM TRANSMITTERS - Tech-Notes ·  · 2007-12-07FM TRANSMITTERS Larcan USA • 1390 Overlook Drive • Lafayette, CO 80026 Phone: ... EX2-250 250W Stereo Exciter/Driver 5kW FM Transmitter

TECHNICAL SPECIFICATION

PARAMETER

RF SPECIFICATIONFrequency Range 87.5 to 108 MHz (F5E/F8E)RF Output Power 5kW ( Max 5.2kW)RF Spurious Emission <-75dBcRF Harmonics <-70dBcAsynchronous AM <-60dB(filtered 20Hz to 20kHz)Synchronous AM <-60dBFrequency Synthesizer PLL ( Direct Modulation)Frequency Steps 100kHz (local/remote)Frequency Stability +/- 2ppmOut of Band lock-out >80dB ( with PLL unlocked)Frequency Deviation +/- 75kHz PeakRF output connector 1 5/8” EIA flange 50 OhmRF Monitor Connector BNC 50 ohm

(filtered 20Hz to 20kHz)

AC Power Input 380V three phase 7400VAMains Variation +10% - 15% Mains Frequency 50Hz +/-1Hz (60Hz optional) Efficiency 66%

Operating Temperature -10EC to +45ECOperating altitude <4500 metresHumidity <90% (non condensing)

Dimensions (inches) 35.2W x 26.6D x 73.6H (40U)Weight 551.2 Lbs

Alarms ( Voltage Free) Forward, Reflected, Temp,.PSU Mono/Stereo, PLL Lock, mains failure, interlock

POWER SUPPLY

ENVIRONMENTAL

PHYSICAL

TELEMETRY

PARAMETER

STEREO OPERATION (Option 1)

STEREO LIMITER (Option 1)

W/B Amplitude Response +/- 0.2dB (30Hz to 100kHz)W/B Stereo Separation >60dB (typical 67dB) 30Hz to 15kHz (decoded)W/B Stereo Cross Talk >50dB (30Hz to15kHz) L+R into L-RTotal Harmonic Distortion <0.1% (Typical 0.035%) 30Hz to 15kHz (decoded)FM S/N Ratio >70dB (30Hz to20kHz) 50us de-emph. Ref. To +/- 75kHz deviationI/P Impedance 1k2 ohms balanced Deviation Sensitivity 3.5V p-p for +/- 75kHz deviation (adj)

AF Amplitude Response +/-0.3dB (30Hz to 15kHz)Stereo Separation >60dB (typical 66dB) 30Hz to 15kHz (decoded)Mono/Stereo Cross Talk >50dB (30Hz to15kHz) L+R into L-RStereo Distortion <0.1% (Typical 0.035%) 30Hz to 15kHz (decoded)Stereo S/N Ratio >70dB (30Hz to20kHz) 50us de-emph. Ref. To +/- 75kHz deviationInput Impedance 600 ohms balanced (XLR)Deviation Sensitivity +6dBm for +/-40kHz deviation (adj)

Audio Limiter Sensitivity 10dBm nom. For 62.5kHz deviationAttack Time < 2mS for increased 10dB I/P stepDecay Time >80mS for decreased 10dB I/P stepLimiter Distortion < 0.35% (10dB into Limiting)Limiter Threshold Internally adjusted

COMPOSITE SPECIFICATION

EX2-250EXCITER (MAIN)

EX2-250 EXCITER(STANDBY)

COAXIALSWITCH

6 W

AY

SP

LIT

TE

R

6 W

AY

WIL

KIN

SO

N C

OM

BIN

ER

O/PCOUPLER 5kW

R.F. O/P

TELEMETRY O/P

MAINS TRANSIENTEQUIPMENT

STEREO AUDIO I/P

L

R

W/B

STEREO AUDIO I/P

L

R

W/B

400V A.C. 3 PHMAINS

3X230V A.C. MAINS

OPTIONAL

R.F. AMPLIFIERS

BSES5KCABINET

1kW20W

CONTROL UNIT

1kW20W

1kW20W

1kW20W

1kW20W

1kW20W

130W

130W

SCHEMATIC DIAGRAM OF 5KW FM TRANSMITTER

Larcan USA • 1390 Overlook Dr ive • Lafayette , CO 80026Phone : 303.665.8000 • Fax : 303.673.9900 • E -ma il : [email protected]