Rechargeable FM ADA compl iance kit for one presenter an

The Williams AV FM ADA KIT 37 RCH is a portable, rechargeable FM assistive listening solution designed to help venues accommodating up to 100 people meet ADA listening requirements. Its 17-channel platform provides a stated operating range of 150 ft (45 m), rechargeable battery support, accessible listener connections, and straightforward controls for presenter-led applications.

Ideal Use Cases

This kit is suited to presenter-led programs in small-to-midsize venues where portable assistive listening coverage is required. Its compact format allows the system to be moved, stored, and deployed as needed. The 150 ft transmission range supports listeners throughout an appropriately sized space, while 17 selectable FM channels let operators choose from frequencies between 72.1 and 75.9 MHz. The system is specifically described for venues accommodating up to 100 people.

Why Choose This Model

The FM ADA KIT 37 RCH combines rechargeable operation with a flexible FM transmission platform. The receiver specifications support two AA alkaline or NiMH batteries, while the transmitter includes a battery-type switch for alkaline or NiMH operation. A two-unit charger supplies 100 mA per bay and uses individual red charging indicators. Nominal charging time is 16 hours.

The transmitter provides an OLED screen for channel or frequency, microphone level, auxiliary input level, battery status, microphone mute, channel lock, and dual-preset information. Menu controls provide access to volume, auxiliary input, compression, channel mode, screen timeout, screen brightness, and default restoration settings.

Installation and Integration

Setup centers on portable components rather than a permanently installed listening system. The transmitter antenna is integrated with the microphone cord, and the receiver antenna is integrated with the connected earphone or headphone cord. This design eliminates separate external antenna connections from the normal portable setup described in the source data.

The transmitter has a 3.5 mm mono microphone input with electret microphone bias and an adjustable 25 dB gain range. A 2.5 mm stereo auxiliary input provides an adjustable 60 dB gain range. Audio compression can be set to 1:1, or off, and 2:1, or on. The receiver provides a 3.5 mm stereo or mono phone jack. Compatible receiver models include the PFM R31, PFM R32, PFM R33, PFM R36, PPA R35, PPA R37, PPA R35-8, and PPA R1600.

Performance Highlights

The system operates across 17 frequencies: 72.1 through 72.9 MHz, 74.7 MHz, and 75.3 through 75.9 MHz. Its FM modulation uses plus or minus 75 kHz peak deviation. The transmitter specification lists frequency-synthesized PLL operation with crystal reference and stability of plus or minus 0.005 percent. RF output is rated at 80 mV/m at 3 m, the maximum allowed by FCC rules.

Receiver specifications include a 75 kHz intermediate frequency, 75 microsecond de-emphasis, an AFC range of plus or minus 120 kHz, and audio output up to 35 mW peak into 16 ohms. The receiver enters sleep mode after approximately six minutes without an RF signal. Power status is shown by a green LED that flashes when the battery is low.

What Makes It Different

This model brings together an ADA-focused purpose, portable FM transmission, rechargeable AA battery compatibility, and detailed operator controls. Accessory specifications cover heavy-duty folding mono headphones with 40 mm drivers, a 20 Hz to 20 kHz frequency response, and a 3.5 mm mono plug. The supplied technical data also documents an earbud-style earphone, electret microphones, and neckloop connectivity. Approvals listed across the system components include CE, FCC, Industry Canada, RoHS, and WEEE.

Final Assessment

The Williams AV FM ADA KIT 37 RCH is a practical choice for operators needing portable assistive listening support for up to 100 people. Its 17 FM channels, 150 ft range, rechargeable workflow, OLED transmitter interface, integrated antennas, and broad receiver compatibility provide a well-defined foundation for presenter-led accessibility applications.