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Williams AV FM T55 FM Plus - Large-Area Dual FM And Wi-Fi Base Transmitter

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Replaces the PPA T45 and PPA T45 NETThe new FM+ integrates professional WaveCAST Wi-Fi audio server technology into a Williams Sound FM assistive listening system. End users can now listen with either an FM receiver or with their own smartphone (via the WaveCAST Listening App). Along with this fl... Read More

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Replaces the PPA T45 and PPA T45 NET

The new FM+ integrates professional WaveCAST Wi-Fi audio server technology into a Williams Sound FM assistive listening system. End users can now listen with either an FM receiver or with their own smartphone (via the WaveCAST Listening App). Along with this flexibility comes exceptional audio quality, as the FM+ is built on a professional digital audio (DSP) platform. Added plus: Its optional Dante interface provides integrators with a full audio networking solution.

The new FM+ is designed to support those who want to use their own smartphones and headphones for a more discreet assistive listening experience. Simplicity is also available for those who want a more traditional assistive listening system with a dedicated FM receiver and headset. Venues no longer need to choose between providing FM or Wi-Fi assistive listening systems. FM+ supports both the new iOS and Android WaveCAST Apps -- in addition to all of the current and legacy Williams Sound FM receivers operating on the 72-76 MHz bandwidth.

This version is not Dante compatable. For Dante compatibility, see the FM T55 D.

The FM Plus uses the WaveCAST app to provide an easy-to-use, intuitive user interface. It is available in iOS or Android. Listeners easily select channel and volume level once their personal device is connected to the Wi-Fi network. The app does not work on FM Broadcasts.

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Product Specs

FM T55
Dimensions8.45" W x 8.25" D x 1.72"H (21.5 cm x 21 cm x 4.4 cm)
WeightTransmitter: 3.2 lbs (1.45 kg)
ColorBlack/Silver with silver legends on the front, white legends on the back
Rack MountStandard 19" Rack, one EIA rack space high, 1/2 space wide
1 - 2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount Kits
Power SupplyDesktop 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 IndicatorPush 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 RangeOperating: +32° F to +104° F (0° C to 40° C); Storage: -4° F to +158° F (-20° C to 70° C)
User Interface3.12" High Resolution OLED display with selections via buttons. Hosted Web page. Remote control and monitoring
DanteOnly available on FM T55 D
EthernetRJ-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 Frequencies72.1-75.9 MHz , 17 wideband channels (selectable)
Frequency Accuracy± 2 ppm stability, 0-50? C
Deviation± 75 kHz maximum
Pre-Emphasis75 microsec
RF Field StrengthDoes not exceed 80 mV/m at 3 m
Compatible AntennasANT 005, ANT 021, ANT 024, or ANT 025
Transmission RangeUp 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 Indicator1 Green LED, indicates RF "On Air"
RF PowerFull, 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 FunctionsDSP based; Compression: 1:1, 1.5:1 or 2:1; High-pass and Low-pass Filter Frequency control
Frequency Response31 - 16000 Hz, ±3 dB (Music Audio Preset)
Signal-to-Noise RatioGreater than or equal to 74 dB Transmitted RF
Total Harmonic DistortionLess than 0.25% @ 1 kHz (RF output)
Common Mode RejectionGreater 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 AdjustIn menu, adjustable to 0 to -50 dB, in 1dB steps
Phantom Power14.4 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 Indicators10-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 Output1/4" TRS stereo jack, mono signal, 15.7 mW, maximum in 33 ? (level adjustable in menu 0 to -40 dB in 2 dB steps)
Line OutputRCA 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 LED)Microphone: -55 dBV (1.7 mV RMS); Line: -25 dBV (55 mV RMS)
Overload Warning (Displayed on Screen)Microphone: -15 dBV (180 mV RMS); Line: +16 dBV (6.3 V RMS)
Absolute Max Rating*Microphone: +20 dBV (10.0 V RMS); Line: +20 dBV (10.0 V RMS)
ApprovalsFCC, RoHS3, WEEE, Industry Canada
Warranty2-year parts and labor

NOTE: Specifications are subject to change without notice.
* Stresses above these ratings may cause permanent damage or degrade reliability.

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