| Model: FM 558-24 Specifications |
| Description |
FM Plus Assistive Listening System with 24 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 +104° F (0° C to 40° 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. |
| 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 LED) / Overload Warning (Displayed on Screen) / Absolute Max. Rating* |
| Microphone |
-55 dBV (1.7 mV RMS) / -15 dBV (180 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 |
| Warranty |
2-year parts and labor |