1 belt clip and (1) HED 021 headphone.

Ideal Use Cases

The Williams AV PPA R37 HD is an FM receiver package for hearing-assistance applications operating in the reserved 72–76 MHz frequency range. It gives an individual listener access to 17 selectable channels and includes the HED 021 headphones needed for personal listening. The compact receiver, included belt clip, and battery-powered operation make this configuration appropriate when the listener needs to carry the receiver while remaining connected to an installed FM hearing-assistance system.

This model is especially relevant for systems using one of its supported frequencies: 72.1 through 72.9 MHz, 74.7 MHz, or 75.3 through 75.9 MHz. Its 3.5 mm stereo/mono output also supports compatible earphones or headphones when a different listening accessory is required.

Why Choose This Model

The PPA R37 HD combines the R37 receiver with two BAT 001 batteries, one CLP 023 belt clip, and one HED 021 headphone. This complete configuration avoids the accessory omissions found in receiver-only package variations. Channel selection is handled with a seek button located in the battery compartment, giving the listener access to all 17 channels without a complicated control layout.

Two AA alkaline batteries provide approximately 50 hours of operation. The receiver can also use two AA NiMH batteries. A green LED indicates power, while a flashing green light signals a low battery. When no RF signal is detected for approximately six minutes, the receiver enters sleep mode automatically.

Installation and Integration

Setup begins by installing the two included BAT 001 batteries and connecting the HED 021 headphones to the 3.5 mm stereo/mono phone jack. The earphone or headphone cord serves as the receiver’s integral antenna, so the listening accessory is also part of the reception system. The seek button inside the battery compartment is used to move through the available channels until the desired FM signal is received.

The included CLP 023 belt clip provides a practical way to carry the receiver. At 4.1 by 2.85 by 1.38 inches, the unit remains compact. It weighs 4.6 ounces with batteries and 2.6 ounces without batteries. Its specified operating temperature range is 0 to 50 degrees Celsius.

Performance Highlights

The R37 covers 17 operating frequencies between 72.1 and 75.9 MHz. Its receiver sensitivity is rated at 2 µV at 12 dB SINAD with squelch defeated, while the AFC range is ±120 kHz. The specified signal-to-noise ratio is at least 65 dB at 100 µV, and input overload is rated at 100 mV.

Audio frequency response extends from 200 Hz to 15 kHz. The receiver provides up to 35 mW peak output into 16 ohms through its 3.5 mm connection. FM modulation uses ±75 kHz peak deviation, with a 75 kHz intermediate frequency and 75 µS de-emphasis. Nominal current consumption is 52 mA.

What Makes It Different

This package is distinguished by its combination of a receiver, batteries, belt clip, and HED 021 headphones. It is ready with the principal components identified for the PPA R37 HD configuration, unlike the PPA R37N package, which excludes batteries and earphones, or the PPA R37-00 package, which excludes earphones.

The seek-based channel system provides access to the full 17-channel range from a single control. Automatic sleep mode helps limit unnecessary battery use when an RF signal is absent, while the dedicated low-battery indication provides a clear operational warning. The receiver is listed with FCC, Industry Canada, RoHS, and WEEE approvals.

Final Assessment

The PPA R37 HD is a compact, black FM hearing-assistance receiver package with selectable 72–76 MHz operation, approximately 50 hours of alkaline battery life, and a 200 Hz to 15 kHz audio response. With the HED 021 headphones, CLP 023 belt clip, and BAT 001 batteries included, it provides the documented components for personal reception on compatible Williams AV FM frequencies. The receiver carries a Lifetime PLUS Limited Warranty, with 90-day coverage stated for most accessories.