FM 558 | FM PLUS LARGE-AREA DUAL FM AND WI-FI ASSISTIVE LISTENING SYSTEM WITH 4 FM R38 RECEIVERS.

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
1–2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount Kits

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

Refer to Williams AV’s Antenna Selection Install Guide for FCC-compliant antennas for this product.

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 O (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)

Microphone

Line

Approvals

FCC, RoHS3, WEEE, Industry Canada

Warranty

2-year parts and labor

Style

Around-ear speaker

Plug

3.5mm mono

Cord

39"

Driver Size

23 mm

Nominal Impedance

32O

Freq. Response

20 - 20kHz

Weight

15g

Max Power Input

30 mW

Sensitivity

118 dB @ 1kHz

Color:

Black

Weight:

1.5 oz

Length:

18.5” cord

Connector:

NKL 001: 3.5 mm mono plug NKL 001-S: 3.5 mm stereo plug with ring disconnected

Impedance:

8-16 Ohms

Input Power:

500 mW max

Magnetic Field Strength:

25 mW input at 1000 Hz produces 1.7 A/m 6” above the center of loop 85µW input produces 0.1 A/m (IEC Standard)

Approvals:

RoHS, WEEE

Warranty:

One Year

Dimensions:

4.1" x 2.85" x 1.38" (104 x 72 x 35mm)

Weight:

4.6oz (130g) with batteries. 2.6oz (73g) without batteries

Color:

Black/Silver. Black ABS Plastic case with Aluminum faceplate.

Battery Type:

(2) AA Alkaline or (2) AA NiMH Rechargeable

Battery Life:

(2) AA non-rechargeable alkaline batteries (BAT 001-2), approx. 50 hrs.

(2) AA rechargeable NiMH batteries (BAT 026-2), 1500mAh, approx. 32 hrs.

Current Consumption:

52mA nominal

Operating Temp. Range:

32° – 122°F (0° to 50°C)

Channels:

17 Wideband, accessed via menu

Operating Frequencies:

72.1, 72.2, 72.3, 72.4, 72.5, 72.6, 72.7, 72.8, 72.9, 74.7, 75.3, 75.4, 75.5, 75.6, 75.7, 75.8, 75.9 MHz*

FM Deviation:

75 kHz

De-Emphasis:

75 µS

Display Screen:

1" OLED

Power Indication:

Power button, backlit green. Good battery strength - glows solid. Low battery - flashes.

Sensitivity:

2 µV at 12 dB Sinad with squelch defeated

Input Overload:

100 mV

Frequency Response:

200 Hz – 15 kHz, ±3dB

Modulation:

FM, +/- 75 kHz peak deviation

Signal-to-Noise Ratio:

Minimum 65 dB @ 1.0V

Receive Antenna:

Integral with earphone/headphone cord

Audio Output:

35 mW max at 16 O

Headphone Connector:

3.5 mm stereo jack, mono output for stereo or mono earphones/headphones

Supplied Earphone:

Stereo,earbud-type with foam cushion, 3.5 mm plug, 32 O

Power Save Mode:

Enters sleep mode after approximately 3 minutes of no RF signal

Approvals:

FCC, Industry Canada, RoHS, WEEE

Warranty:

Lifetime PLUS Limited Warranty, 90 Days on most accessories.