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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

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news  PRODUCTS
  SAW Filtered Stereo TV IF Modulator



• High-quality. The video quality of IF Modulator represents the right step just before the DTV generation. Using a new back-porch clamping circuit, combined with linearity corrector it’s possible to obtain a perfect video quality with negligible distortions and intermodulations. All this means a superior video modulation quality.

• Compatible with all TV standards. These IF Modulator is fully compatible with all video standards (PAL, NTSC, SECAM) and is available for B,G,M,N,I,D,K,K1 and L modulation systems. These professional multistandard TV IF Modulator is designed to produce sound and vision modulated signals at any standard intermediate frequency.

• Vestigial sideband SAW filter. For a perfect vestigial sideband modulation an high quality SAW filter is used complying with all international standards. These filters outstand for their excellent phase linearity and flat pass-band and group-delay characteristics.

• Group delay precorrection. TV receiver group delay precorrection is available for all standards (optional).

• White clipper & Video Emphasized. The white clipper & Video Emphasized have been setting up to guarantee the best modulation quality.

• Sync restore. An internal sync restore circuit (optional) allows to ripristinate a perfect video sync pulse also with corrupted or scrambled video signal input.

• PLL sound carrier. Sound and video intercarrier is synchronized by PLL to video line frequency for maximum stability and negligible intermodulations.

• Stereo and dual sound. Available with dual sound facility (optional) for stereo or dual sound transmissions.

• Panel metering. Full front panel metering and control for complete setting and performance checking.

• Remotely Audio Mode synchronization (Optional). Input for external Audio Mode synchronization is available for Audio Mode system (Stereo/Dual/Mono).


  • IF Modulator Technical Specification :


  • 1. I.F - Output

  • - Output frequency IF : 38.90MHz
    - Vestigial Side Band Filter : 38.9MHz SAW (Surface Accoustic Wave) Filter
    - Output level of video carrier : -10 to +0dBm adjustable
    - Output frequency stability : ± 50 Hz
    - Vision Modulation : AM Negative (A5C) according to CCIR B and G standards
    - Output impedance : 50 Ω
    - Output connector : BNC
    - Harmonic/Spurious emissions : < -60 dBc

  • 2. Video Input

  • - Input connector : BNC unbalanced
    - Input impedance : 75 Ω
    - Input signal level : 1 Vp.p. (adjustable)
    - Input return loss : >30 dB
    - Differential gain : < ± 3%
    - Differential phase : < ± 3°
    - Modulation Limitator : White Level Clipper
    - Video Clamp : Reinsertion of D.C Component and Video to Black Level
    - Amplitude Response : +/- 0.5dB

  • 3. Audio Input

  • - Inputs : Connector XLR balanced
    * No.1/Left for Monophonic Version
    * No. 2/Right for Stereo or Dual Sound Version
    - Input impedance : 600 Ω
    - Total Harmonic Distortion : < 0.5% (dev.+/- 50Khz)
    - Audio Pre-Emphasize mode : 25uS, 50uS and 75uS (User Selectable)
    - Sound Carrier Frequency : Obtained with High Stability Synthesized PLL
    * Sound 1 : 33,40 Mhz (Monophonic)
    * Sound 2 : 33,15 Mhz (Stereo or Dual Sound

  • 4. General Specification

  • - Operating temperature range : -5 °C to + 45 °C
    - Ambient humidity : max. 95%
    - AC power supply : 220/240 Vac ±15%,47 to 62Hz
    - Power consumption : 20 VA
    • Cabinet Standard : 19” 2U
    • Dimensions : W 482, D 4380, H 90 mm
    • Weight : approx. 6,7kg

    Features and specifications subject to change without notice.







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