WILLIAMS AV FM 557 Plus Large-area Dual FM and Wi-Fi Assistive Listening System with 4 FM R37 Receivers

FM 557 - Overview

• Features:

  • Seek-button access to all 17 wideband frequencies in the 72-76 MHz bandwidth
  • Channel-lock capability
  • Battery-saving sleep mode
  • Low-battery indicator
  • Field tunable
   

• Specifications:

  • Dimensions: 8.45" W x 8.25" D x 1.72"H (21.5 cm x 21 cm x 4.4 cm)
  • Weight: Transmitter: 3.2 lbs (1.45 kg)
  • Color: Black/Silver with silver legends on the front, white legends on the back
  • Rack Mount: Standard 19” Rack, one EIA rack space high, 1/2 space wide.
  • Power Supply: Desktop Style Transformer (TFP 062); Input: 100-240 VAC, 50/60 Hz. IEC Line Cord; Output: 24 VDC, 750 mA, 18W. 2.5mm ID center positive barrel connector
  • Power ON Indicator: Push On/Push Off latching power button, backlit green indicates power ON, backlight off indicates power OFF, fading from bright to dark indicates Sleep Mode.
  • Temperature Range: Operating: +32° F to +122° F (0° C to 50° C); Storage: -4° F to +158° F (-20° C to 70° C)
  • User Interface: 3.12” High Resolution OLED display with selections via buttons. Hosted Web page. Remote control and monitoring.
  • Dante: Only available on FM T55 D
  • Ethernet: RJ-45 on back of unit supports CAT 5e cable lengths up to 328 feet (100 meters); 10/100 Base-T IEEE 802.3 compliant, unique MAC address
  • RF Section
  • Operating Frequencies: 72.1-75.9 MHz , 17 wideband channels (selectable)
  • Frequency Accuracy: ± 2 ppm stability, 0-50° C
  • Deviation: ± 75 kHz maximum
  • Pre-Emphasis: 75 microsec
  • RF?Field Strength: Does not exceed 80 mV/m at 3 m
  • Compatible Antennas: ANT 005, ANT 021, ANT 024, or ANT 025
  • Transmission Range: Up to 1000 ft (304 m) with ANT 005 coaxial antenna mounted on rear chassis connector
  • RF Outputs: (1x) #10-32 stud connector in center of unit (pcb mounted) (1x) F-connector on rear chassis
  • RF Transmit Indicator: 1 Green LED On Air Indicator
  • RF Power: Full, Medium, Low or OFF indiacted by menu icon.
  • RF Time Out (sleep mode): 30 min. duration, 4 hr. duration, or Always On selected via menu. Starts when audio is below -18 dB level with no button pressed for selected duration.
    
    Audio Section
  • Audio Processor Functions: DSP based; Compression: 1:1, 1.5:1 or 2:1; High-pass and Low-pass Filter Frequency control
  • Frequency Response: 31-16000 Hz, ±3 dB (re: 1 kHz, ±3 dB) (“Music” Audio Preset)
  • Signal-to-Noise Ratio: 67 dB (typical) Transmited RF
  • Total Harmonic Distortion: Less than 0.25% @ 1 kHz (RF output)
  • Common Mode Rejection: Greater than 57 dB @ 1 kHz, Mic or Line
  • Audio Inputs: (1x) Combination 3-pin XLR, 1/4" (TRS) jack for balanced or unbalanced line level, or balanced or unbalanced microphone with selectable phantom power
  • Audio Input Gain Adjust: In menu, adjustable to 0 to -50 dB, in 1dB steps
  • Phantom Power: 14.4 VDC applied through 2.2 kOhms resistors to analog combo jack: Pin 2 and Pin 3 on XLR jack, or tip and ring on 1/4" TRS jack
  • Audio Level Indicators: 10-LED?array that reads -18 to +9 dB at 3 dB intervals. 7 Green, 2 Amber, and 1 red LED. Green LEDs indicate normal operating audio level peaks, Amber LEDS indicate close to overload peaks, Red LED indicates overload peaks
  • Headphone Output: 1/4" TRS stereo jack, mono signal, 14.85 mW at +9dB, maximum in 33 Ω (level adjustable in menu 0 to -40 dB in 2 dB steps)
  • Line Output: RCA jack (black), -10 dBV (.32 VRMS); Output impedance 100 ohms at +9dB
  • Input Levels (Bal or Unbal) (at Audio Input Gain = 0dB): Nominal (1st Amber +3 dB LED): Overload Warning (Displayed on Screen): Absolute Max. Rating*
  • Microphone: -55 dBV (1.7 mV RMS): -22 dBV (80 mV RMS): +20 dBV (10.0 V RMS)
  • Line: -25 dBV (55 mV RMS): +16 dBV (6.3 V RMS): +20 dBV (10.0 V RMS)
  • Approvals: FCC, RoHS3, WEEE, Industry Canada
   

• Item Includes:

  • 1x FM T55 transmitter
  • 4x PPA R37N receivers
  • 4x EAR 0x2x2 surround earphones
  • 2x NKL 001 neckloops
  • 1x IDP 008 ADA wall plaque
   

• Warranty:

  • 2-year parts and labor