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The Clear-Com PTX-3 is a UHF wireless IFB Transmitter basestation with 256 selectable frequencies

Wireless IFB (interruptible fold back) systems are used for talent cueing and crew communications in broadcast and motion picture production. In other cases, the IFB system is used by directors and other management to monitor program audio during a production.

UHF wireless IFB Transmitter basestation with 256 selectable frequencies at 100kHz increments. Stand alone or rack mountable with the PRK-2 kit. (486.4 - 691.1 MHz). Non-RoHs


Operating Frequencies
486.4 to 691.1MHz
  • Block 19: 486.4 to 511.9 MHz
  • Block 20: 512.0 to 537.5 MHz
  • Block 21: 537.6 to 563.1 MHz
  • Block 24: 614.4 to 639.9 MHz
  • Block 25: 640.0 to 665.5 MHz
  • Block 26: 665.6 to 691.1 MHz

  • Frequencies Channels (per block): 256
    Channel spacing: 100 kHz (0.1 MHz)
    Spurious & Harmonic Suppression: 37 dBc above 1 GHz
    Frequency Stability: ą.001% (10 ppm) @ 25şC
    Temperature Stability: ą.001% (10 ppm) from -30ş C to +50ş C
    Channel Selection: Momentary pushbutton switches, TUNE UP and Down
    Compatibility Modes: IFB, Digital Hybrid Wireless; 400 Mode, 200 Mode, 100 Mode, Mode 3, Mode 6
    Pilot Tone: 29.997 kHz IFB Mode, 32.765kHz; 200 Mode, 400 Mode step selected, 32.768kHz Mode 6
    Modulation: FM, ą20 kHz deviation IFB & 100 Mode, ą75kHz 200 & 400 Mode, ą50kHz Mode 3 and Mode 6

    Audio Frequency Response
  • 100 Hz to 8 kHz
  • ą1 dB, IFB MODE system response (see Rolloff)
  • 30Hz to 20kHz ą 1dB
  • 200 & 400 MODE system response (see Rolloff)

  • Rolloff: Low frequency audio rolloff is Menu selectable for 3 dB down at 35 Hz or 50 Hz
    Signal to Noise Ratio: 90 dB typical ("A" weighted)
    RF Power Output: 250 mW (nominal)
    Output Impedance: 50 Ohms
    Audio Input Levels: 0 dBu for Line, RTS1 & RTS2, -10 dBu for ClearCom, and -42 dBu mic dry inputs, +/-50VDC max
    Audio Input Config: Balanced and Unbalanced, rear panel selectable for Line, Mic, RTS 1, RTS 2 and ClearCom
    Audio Input Impedance: Greater than 2 K balanced, greater than 1K unbalanced at any gain setting
    Control Range: -18 dB to +24 dB (0 dB nominal center), software selectable
    Audio Input Jack: Standard XLR female connector
    Input Power: 12 to 14 VDC typical, 200 mA max; Max input range 6 to 18 VDC
    Power Input Jack: Coax type, locking LZR RL26AE
    Indicators: Backlit Liquid Crystal Display. Displays modulation meter, frequencies, modes, rolloff, audio level, and tuning groups

    Front Panel Controls
  • MENU momentary pushbutton switch
  • Power OFF-TUNE-XMIT, 3 position slide switch
  • Select Up momentary pushbutton switch
  • Select Down momentary pushbutton switch

  • Rear Panel Controls: Input Mode Select, 4 section DIP switch
    Weight: 9oz
    Size: 5.25" long (including connectors) x 3.25" wide x 1.25" high
    Emission designator: 180KF3E

    The T4 IFB transmitter is FCC type accepted under Part 74:470 - 608MHz and 944.1 - 951.9 MHz
    Manufacturer Part Number : PTX-3



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