8-channel FM Receiver

PPA R37-8N

The 8-channel FM Receiver PPA R37-8 FM features easy-to-use, 8 channel rotary selection knob with access to 8 pre-set wideband frequencies between ADA-reserved channels of 72-76 MHz. The receiver brings audio directly to the listener, increasing comprehension and clarity.

Flexible and simple, the receiver is compatible with the following Williams Sound FM transmitters. Digitally synthesized for even greater audio clarity and stability. A versatile 3.5mm stereo/mono jack allows for a variety of earphone and headphone options, and is neckloop/telecoil-equipped-hearing-aid compatible.

NOTE: The PPA R37-8 FM Receiver requires a transmitter operating on 72-76 MHz. The receiver is approved by the FCC for operation in U.S. Markets. The receiver cannot be used in all countries. Check with your government´s radio regulations for 72-76 MHz operation.


  • Rotary knob to easily choose 8 wideband frequencies in the 72-76 MHz bandwidth
  • Battery-saving sleep mode
  • Low-battery indicator
  • Recharge capability when used with NiMH batteries
  • Stereo headphone jack

PPA R37-8N architectural and engineering specifications

The receiver shall be encased in black, PC/ABS impact-resistant plastic with a hinged battery door.
The receiver shall be a body-pack style and include a detachable belt-clip for hands-free operation.
The receiver shall have a 3.5 mm stereo jack to accommodate stereo or mono, low impedance earphones, headphones and neckloops.
The receiver shall have a combination volume control with power on/off rotator dial. It shall have a green LED indicating battery and system status codes.
The receiver shall have access to 8 preset wideband channels between 72-76 MHz. Channel selection shall be made by rotating a channel selector knob.
The receiver shall have a slide switch inside the battery compartment to select disposable Alkaline or NiMH rechargeable battery operation. It shall have charger contacts on the bottom of the receiver for use with Williams Sound drop-in chargers CHG 3512 and CHG 3502.
The receiver shall operate up to 50 hours with two disposable AA Alkaline batteries (BAT 001-2) and up to 32 hours with two AA NiMH rechargeable batteries (BAT 026-2).
The receiver shall provide a maximum output of 35 mW at 16 ø with an earbud type earphone. The receiver’s audio frequency response shall be 200 Hz to 15 kHz ± 3 dB and the signal to noise ratio shall be 65 dB min. The receiver sensitivity shall be 2 µV or better at 12 dB Sinad with squelch defeated. The receiver shall accept up to ±75 kHz FM deviation and have a 75 µs de-emphasis time constant.
The receiver shall have FCC, Industry Canada approvals and be compliant with RoHS and WEEE regulations. The receiver shall be covered by a Lifetime PLUS Limited Warranty.
This receiver model shall be the Williams Sound model PPA R37-8.

PPA R37-8N


4.1″ x 2.85″ x 1.38″ (104 x 72 x 35 mm)


4.6 oz (130 g) with batteries. 2.6 oz (73 g) without batteries



Battery Type:

(2) AA Alkaline or

(2) x AA NiMH

Battery Life:

Two AA non-rechargeable alkaline batteries (BAT 001-2), approx. 50 hrs, or

two AA rechargeable NiMH batteries (BAT 026-2), 1500 mAh, approx. 32 hrs

Current Consumption:

42 mA nominal

Temperature Range:

– 0 to 50 °C


8, accessed via rotary knob on top of unit

Operating Frequencies:

72.1, 72.3, 72.6, 72.8, 74.7, 75.4, 75.7, 75.9 MHz


FM, +/- 75 kHz peak deviation


75 µS


Power: Green; Low Battery: Flashes Green; Sleep mode: Fade-on,Fade-off


2 µV at 12 dB Sinad with squelch defeated

Input Overload:

100 mV

Frequency Response:

200 – 15 kHz

Signal-to-Noise Ratio:

65 dB min @ 100 uV

Receive Antenna:

Integral with earphone/headphone cord

Audio Output:

35 mW max, peak into 16 Ω

Output Connector:

3.5 mm stereo/mono phone jack

Included Earphone:

Earbud-type with foam cushion, 3.5 mm plug, 32 Ω

Sleep Mode:

Enters sleep mode after approximately 6 mins of no RF signal,

returns to normal operation when a transmitter is re-established on same channel


FCC, Industry Canada, RoHS, WEEE


Lifetime PLUS Limited Warranty (90 Days on most accessories)



Lifetime PLUS Limited

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