kwlbroadcast
 
home about kwlbroadcast our products our portfolio contact us kwlbroadcast.com

KWL Broadcast is Indonesian manufacturer of FM and TV broadcasting equipment. Currently, we are covering four main areas :

  • FM transmitters
  • STL (Studio Transmiter Link)
  • TV transmitters
  • Transmitting antennas and accessories

Read More

27.09.2018
Ada beberapa Model system Modulasi di dalam Pemancar AM, Antara lain adalah :

Promo Domain...
Read More



24.07.2009
Aplikasi Lain untuk Sistem “Quadrature Amplitude Modulation”

Quadrature Amplitude Modulation (QAM) adalah encoding informasi menjadi isyarat pembawa gelombang...
Read More



news  PRODUCTS
  Digital Demodulator Triple Conversion UHF-STL/LCD



• General, The STD-7/LCD-30 Studio to Transmitter Link (STL) is designed to convey FM program material from a studio site to a transmitter site. This equipment may also be used to provide high-quality program transmission in intercity relay service.

• Synthesized from 230 to 1020 MHz (depended on models or up on request, in Indonesia allocation frequency was 324-328,6MHz and 348-350MHz). The transmitted and received frequency can be easily set by LCD Menu on Front Panel.

• Excellent stereo separation. A built-in group delay and amplitude precorrector guarantees a very low phase distortion and a great stereo separation in the whole 15 kHz band.

• Low THD distortion: the THD value with stereo or mono demodulated and de-emphasized signals is negligible.

• uProcessor Controlled protections in case of load mismatching (VSWR) or transmitting frequency error (LOCK) . Every alarm event is displayed by front panel LEDs and/or LCD Front Panel Display and can be resetted by Automatic and/or manual control.

• Flat frequency response: due to the latest generation technology and the components precision the flatness of frequency response is absolute.

• High sensitivity: Thanks to the Digital Demodulator system, Low Noise RF Amplifier and Triple Conversion System provide to reduce the STL's antennas investment.

• Great RF immunity: allows to operate in most hostile RF environments.

• High adjacent channel rejection: obtained thanks to the excellent Triple Conversion System and the precision of RF filtering.

• High frequency stability with the internal temperature compensated crystal reference.

• Meets or exceeds all FCC and CCIR requirements.

  • STD-7/LCD-30 Transmitter Specifications :

  • • RF Power Output : 0-30Watt Adjustable
    • Frequency : 324-328.6Mhz, 348-3350Mhz (Indonesian Version, Others on request)
    • Frequency Change : Direct Changeable from LCD Menu Control
    • Frequency Stability : better than 0.00025% at room temperature
    • Deviation (100% Modulation) : +/-50KHz (Composite), +/-40KHz(Monaural)
    • Spurious & Harmonic Emission : More than 60dB below Carrier Level
    • Modulation Input :
    - Composite : 3.5Vp-p @6KΩ, Unbalanced, Fr. : 30Hz-80Khz, BNC
    - Monaural : +10dBm @600Ω Balanced, Fr. : 30Hz-15Khz, XLR
    - MPX : 1.5Vp-p @4KΩ, Unbalanced, Fr. : 30Hz-160Khz, BNC
    • Stereo operation (internal encoder):
    - Input connectors : (L&R) XLR, balanced.
    - Input impedance : 600 Ω
    - Input levels : -10χ+12 dBm
    - 19 kHz attenuation : ≥ 55 dB
    - Pre-emphasis : 25/50/75 μs (front Panel Switch)
    - Bandwidth (± 0.25 dB) : 20 Hz χ15 KHz
    - S/N ratio (±75 kHz dev. at 1 kHz, 50uS) : ≥ 80 dB
    - Stereo separation (20 Hzχ15 kHz) : ≥ 65 dB
    - THD : ≤ 0.03%
    - AM syncro residual : < -64 dBc
    - AM asyncro residual : < -68 dBc
    • Power Source : 220V/AC (+/-10%), 50/60Hz, 70Watts
    • Dimension : 2U, 19” Standard Rack Mounted

  • STL-RX3 Receiver Specifications :

  • • RF Sensitivity : 120uV(-60dBm) or less required for 60dB Signal
    • Frequency : 300-330Mhz, 335-399,9Mhz (Indonesian Version, Others on request)
    • Frequency Change : Direct Changeable from LCD Menu Control
    • System Features :
    - Triple Conversion System 70.3Mhz for 1st IF, 10.7MHz for 2nd IF and 700kHz for 3rd IF
    - Digital Demodulator System on FM IF Demodulator
    - Very low distortion Ceramic IF filter offering unprecedented selectivity
    - Very High Quality of IF Demodulator/Processor
    - Two-decade logarithmic Signal Strength meter
    - Peak reading meter for all major function
    - Important status function implemented with LED indicators
    - Internal MPX Processor to eliminate degradation of modulation
    - Designed to have minimum of adjustments for trouble-free operation
    - Internal Lightning protection for major output and input installations
    • Frequency Stability : better than 0.00025% at room temperature
    • Selectivity :
    - Composite : 3dB IF Bandwidth, 125Khz
    - Monaural : 3dB IF Bandwidth, 90Khz
    - Spectral Efficient Composite : 3dB IF BW, 100Khz
    • Adjacent Channel Level : +10dBc to degrade SNR by 3dB
    • Modulation Output :
    - Composite : 3.5Vp-p @200Ω, Unbalanced, Fr. : 30Hz-80Khz, BNC
    - MPX (Digital-Out) : 1.5Vp-p @100Ω, Unbalanced, Fr. : 30Hz-160Khz, BNC
    - Stereo Ouput : +10dBm @600Ω Balanced, Fr. : 30Hz-15Khz, TRS
    • Power Source : 220V/AC (+/-10%), 50/60Hz, 30Watts
    • Dimension : 2U, 19” Standard Rack Mounted

    Features and specifications subject to change without notice







    HOME | ABOUT US | PRODUCTS | PORTFOLIO | NEWS | CONTACT US
        Copyright © 2020 KWLBROADCAST