Clear-Com PTX3-21 UHF IFB Transmitter Base Station Frequency Block 21

ITEM #: CLCM-PTX3-21 MFG #: PTX3-21

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    PTX3-21 - Overview

    The Clear-Com PTX-3-21 is a UHF Digital Hybrid wireless IFB Transmitter base station in operating in Block 21, that's 537.6 to 563.1 MHz with DSP capability. Wireless IFB (interruptible fold back) systems operate between 486.4 and 639.9MHz. Wireless IFBs are used for one-directional communication. Directors and other management can use this to monitor program audio, or for talent cueing and crew communications during a production.

    The PTX-3 uses a synthesized, frequency selectable main oscillator. The frequency is extremely stable over a wide temperature range and over time. This flexibility significantly helps avoid interference problems in mobile or traveling applications.

    The transmitter can be powered from any external DC source of 6 to 18 Volts at 200 mA maximum or from the provided 12 Volt power supply with a locking power connector. The unit has an internal self-resetting fuse and reverse polarity protection.

    The PTX-3 is housed in a machined aluminum case with a tough electrostatic powder coating. The front and rear panels are anodized aluminum with laser etched engraving. The included antenna is a right angle, 1/4 inch wavelength monopole with a BNC connector, constructed of polymer coated flexible steel cable.

    Please Note! This item is just one component of a larger system. Please refer to the diagram for ideas and recommendations for your Clear-Com intercom system

    • Features:

      • UHF wireless IFB Transmitter basestation
      • Operate between 486.4 and 639.9MHz
      • Stand alone or rack mountable with the PRK-2 kit
      • Selectable Low-Frequency roll-off
      • "Locked" setting prevents accidental changes
      • Overcomes channel noise and compandor artifacts
      • Tough machined aluminum case housing

      • NOTE: This product is not approved for sale in Europe.
    • Specifications:

      • Operating Frequencies
      • 486.4 to 639.9MHz
      • Block 19: 486.4 to 511.9 MHz
      • Block 21: 537.6 to 563.1 MHz

        Frequencies Channels (per block)
      • 256

        Channel spacing
      • 100kHz (0.1MHz)
      • Spurious & Harmonic Suppression: 37dBc above 1GHz
      • Frequency Stability: ±.001% (10 ppm) @ 25§C
      • Temperature Stability: ±.001% (10 ppm) from -30§C to +50§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, ±20 kHz deviation IFB & 100 Mode, ±75kHz 200 & 400 Mode, ±50kHz Mode 3 and Mode 6
      • Audio Frequency Response: 100 Hz to 8 kHz, ±1 dB, IFB MODE system response (see Rolloff), 30Hz to 20kHz ± 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 Clear-Com, 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 Clear-Com
      • 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

      • 9oz

      • 5.25 (including connectors) x 3.25 x 1.25in (LxWxH)
      • Emission designator: 180KF3E
      • The T4 IFB transmitter is FCC type accepted under Part 74:470 -608MHz and 944.1 - 951.9 MHz
      • The FCC requires that the following statement be included in this manual:
      • This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment. This device should be installed and
      • operated so that its antenna(s) are not co-located or operating in conjunction with any other antenna or transmitter. A separation distance of at least 20cm (8 inches) must be maintained to comply with the FCC Radio Frequency Maximum Permissible Exposure (MPE) requirements.
    • GTIN:


    PTX3-21 - Required Accessories

      PTX3-21 - Recommended Accessories

      California Residents:
      Cancer and Reproductive Harm -