Multi-channel FM receiver with OLED display

The Williams AV FM R38 is a compact, multi-channel wideband FM receiver covering the 72–76 MHz frequency range. It combines 17 menu-accessible channels with a high-resolution 1-inch OLED screen, flexible AA battery operation, and a supplied earbud-style earphone. Batteries are also included.

Ideal Use Cases

The FM R38 is designed for listening situations that require access to compatible wideband FM transmissions within the 72–76 MHz range. Its 17 available channels can be selected through the receiver menu, allowing the unit to be configured for the required operating frequency. The 3.5 mm connection accommodates stereo or mono earphones and headphones while providing a mono audio output. With the receive antenna integrated into the connected earphone or headphone cord, the receiver offers a self-contained personal listening configuration without a separate antenna component.

Why Choose This Model

A high-resolution OLED screen provides a clear interface for channel access and receiver operation. The backlit green power button also communicates battery status: it glows steadily when battery strength is good and flashes when the batteries are low. Users can power the receiver with two AA alkaline batteries or two AA NiMH rechargeable batteries. Approximate operating time is 50 hours with specified non-rechargeable alkaline batteries or 32 hours with specified 1500 mAh rechargeable NiMH batteries. This dual-battery compatibility makes it possible to select either disposable or rechargeable power based on operational needs.

Installation and Integration

Setup centers on installing two compatible AA batteries, connecting an earphone or headphone to the 3.5 mm stereo jack, and selecting one of the 17 wideband channels through the menu. Because the receive antenna is integral to the earphone or headphone cord, the connected listening device is part of the receiver configuration. The jack supports stereo or mono earphones and headphones, although the receiver output is mono. When no RF signal is detected for approximately three minutes, the FM R38 enters sleep mode to conserve battery power. Its specified operating temperature range is 32–122°F, or 0–50°C.

Performance Highlights

The receiver covers 17 listed frequencies from 72.1 MHz through 75.9 MHz and operates with 75 kHz FM deviation and 75 µS de-emphasis. Its frequency response is rated at 200 Hz–15 kHz, ±3 dB, while the signal-to-noise ratio is a minimum of 65 dB at 1.0 V. Sensitivity is specified at 2 µV at 12 dB SINAD with squelch defeated, and input overload is rated at 100 mV. Audio output reaches a maximum of 35 mW at 16 Ω. The headphone impedance specification is 32 ohms, matching the supplied stereo earbud-type earphone with foam cushion, 3.5 mm plug, and 32 Ω impedance.

What Makes It Different

The FM R38 brings its primary operating information to a 1-inch OLED display while keeping channel selection within a menu-driven interface. Its 17 wideband channels, integrated cord antenna, mono output compatibility with stereo or mono listening devices, and automatic sleep mode form a focused receiver feature set. The enclosure combines a black ABS plastic case with an aluminum faceplate in a black and silver finish. It measures 4.1 × 2.85 × 1.38 inches and weighs 4.6 ounces with batteries or 2.6 ounces without them. Listed approvals include FCC, Industry Canada, RoHS, and WEEE.

Final Assessment

The Williams AV FM R38 is a clearly specified 72–76 MHz receiver for users who need 17 selectable wideband channels, an OLED interface, and standard AA power options. Its supplied earphone, included batteries, integrated antenna arrangement, battery-status indication, and power-saving sleep mode provide the essential components for operation. The receiver carries a Lifetime PLUS Limited Warranty, with 90 days of coverage stated for most accessories.