Shure U1 J4 Radio Frequency Beltpack Transmitter UHF 554-584 Megahertz

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    Shure U1 J4 Radio Frequency Beltpack Transmitter UHF 554-584 Megahertz

    The wireless bodypack transmitter shall operate in the UHF band and shall provide a tone key (32,768 kHz) to increase reliability and to minimize unwanted noise. The system shall allow to change the operating frequency in 25 kHz steps in order to avoid RF interference, enabling up to 47 systems to operate simultaneously in one frequency band. Preconfigured group, channel and frequency setups shall be available to ensure that multiple systems in use do not interfere with one another. The transmitter shall be programmable through a menu as well as infrared synchronization. The transmitter shall provide a threaded connector to securely lock microphones or instrument cables. The backlit LC display shall show name, battery gauge, carrier frequency, as well as gain and sensitivity settings. The LCD menu controls should cover separately adjustable gain (-10 to +20 dB) and input sensitivity (attenuation pad: +15, 0, -10 dB), tunable carrier frequency, switchable RF power, frequency and power lock as well as the access to the RF Safety Mode (transmitter operation with muted RF carrier).


    • Switchable RF Power (10/50mW or 10/100mW, Region Dependent)
    • Low Profile, Compact Design
    • Frequency and Power Lockout
    • Bit-mapped Backlit LCD Display
    • 2 AA Batteries - Up to 8 hours Continuous Use
    • Automatic Transmitter Setup
    • Durable, Light-weight Magnesium Construction
    • Removable Bodypack Antenna


    • RF Carrier Frequency Range: 554–584 MHz
    • Working Range: 152.4 m, minimum, under typical conditions; 487.6 m line of sight
    • Audio Frequency Response: 50 to 15,000 Hz, ±2 dB
    • Gain Adjustment Range: 0 to 40 dB
    • Modulation: ±45 kHz deviation compressor-expander system with pre-and de-emphasis
    • RF Power Output: 10 mW maximum
    • Dynamic Range: >110 dB, A-weighted
    • Image Rejection: 100 dB typical
    • Spurious Rejection: 75 dB typical
    • Ultimate Quieting (ref. 45 kHz deviation): >100 dB, A-weighted
    • Audio Polarity: Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 with respect to pin 3 of low impedance output and the tip of the high impedance 1/4-inch output
    • System Distortion (ref. ±45 kHz deviation, 1 kHz modulation): <0.3% Total Harmonic Distortion typical
    • Power Requirements: Two (2) 1.5V AA alkaline batteries recommended; Nicad batteries optional
    • Battery Life (Typical): 12 hours (with Duracell MN1500 1.5V AA alkaline battery)
    • Operating Temperature Range: -7° to 49° C
    • Overall Dimensions: 92.2 mm L x 64.7 mm W x 24.2 mm D
    • Net Weight: 175.2 g without battery


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