FM receiver with seek-button channel selection

Ideal Use Cases

The Williams AV FM R37 is designed for hearing-assistance listening wherever a wideband FM transmission is available on one of its 17 preset frequencies. The channel set covers 72.1 through 72.9 MHz, 74.7 MHz, and 75.3 through 75.9 MHz. These frequencies are identified in the source data as reserved for hearing assistance by the ADA. The receiver provides a dedicated listening option for users who need direct earphone output and seek-button channel selection. Its black housing measures 4.1 x 2.85 x 1.38 inches and weighs 4.6 ounces with batteries or 2.6 ounces without batteries.

Why Choose This Model

The FM R37 combines a defined 17-channel frequency set with straightforward seek-based selection. The seek button is located inside the battery compartment, where it provides access to each preset channel. A green LED indicates power and flashes green when the battery level is low. The receiver accepts two AA alkaline or two AA NiMH batteries. When powered by two BAT 001 non-rechargeable alkaline batteries, its listed operating time is approximately 50 hours. It also enters sleep mode after approximately six minutes without an RF signal, reducing unnecessary operation when no transmission is being received.

Installation and Integration

Integration centers on matching the transmitting system to one of the FM R37’s listed operating frequencies. After two AA batteries are installed, the listener connects the earphone and uses the seek button in the battery compartment to locate the transmitted channel. The earphone or headphone cord serves as the receiver’s integral antenna, making the connected listening cable part of the receive path. Audio is delivered through a 3.5 mm stereo/mono phone jack. The included earphone is an earbud-style model with a foam cushion, 3.5 mm plug, and 32-ohm impedance. The specified operating temperature range is 0 to 50 degrees Celsius.

Performance Highlights

The receiver uses FM modulation with plus or minus 75 kHz peak deviation. Its listed intermediate frequency and FM deviation are both 75 kHz, while de-emphasis is 75 microseconds and the AFC range is plus or minus 120 kHz. Sensitivity is specified at 2 microvolts for 12 dB SINAD with squelch defeated, and input overload is rated at 100 mV. The frequency response extends from 200 Hz to 15 kHz, with a minimum signal-to-noise ratio of 65 dB at 100 microvolts. Maximum audio output is 35 mW peak into 16 ohms. Nominal current consumption is 52 mA. Together, these published values provide concrete RF and audio criteria for evaluating the receiver within a hearing-assistance system.

What Makes It Different

The FM R37’s distinguishing configuration is its combination of 17 preset hearing-assistance frequencies, seek-button channel access, and an antenna integrated through the earphone or headphone cord. The protected location of the seek control inside the battery compartment separates channel selection from the receiver’s external operating controls. Its power indicator also serves as the low-battery alert, while automatic sleep mode responds to the absence of an RF signal. Listed approvals include FCC, Industry Canada, RoHS, and WEEE. The warranty is identified as a Lifetime PLUS Limited Warranty, with 90 days on most accessories.

Final Assessment

The Williams AV FM R37 is a compact, battery-powered receiver built around a clearly documented set of wideband FM hearing-assistance channels. Its principal decision points are the 72.1 to 75.9 MHz preset frequency set, seek-button selection, 3.5 mm stereo/mono output, included foam-cushion earbud, and approximately 50-hour alkaline battery life. Detailed sensitivity, frequency-response, signal-to-noise, AFC, and audio-output ratings support informed system planning. For applications operating on one of its 17 specified frequencies, the FM R37 provides a focused receiving solution with direct listening output, visual battery status, and automatic sleep behavior.