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Hearing Helper Personal FM Receiver • Model PFM R31  

Description:  

Maximize a student’s ability to listen with the Personal FM R31 receiver from Williams Sound. The  

PFM R31 will ensure that everyone in the classroom can hear the speaker’s message clearly and easily.  

Each receiver has a range of up to 150 feet, and will operate up to 80 continuous hours. Versatile 3.5  

mm jack allows for a variety of earphone and headphone options, or, equip it with a neckloop to  

make it compatible with most telecoil-equipped hearing aids.  

The PFM R31 features a sensitive environmental microphone which gives the listener more flexibility  

on what they want to hear. By turning on the environmental mic, they can listen to a nearby class-  

mate speak more clearly.  

Applications:  

Classrooms • Job Consultation • Job Training • Tours • Group Meetings  

PFM R31 FM Receiver:  

On  

_{Mic Jack} Indicator  

Dimensions:  

3-5/8" L x 2-3/8" W x 7/8" H (92.1 mm x 60.3 mm x 22.2 mm)  

Mic  

Volume  

Weight:  

Color:  

4.6 oz (130 g) with batteries  

Royal blue, shatter-resistant polypropylene  

EAR  

FM  

On  

Mic  

MIC  

Battery Type:  

Two (2) AA 1.5 V non-rechargeable Alkaline batteries (BAT 001),  

FM  

Off  

Max Min  

Max  

1

(

1

4 mA nom. current drain, 80 hours approx. life  

OR) Two (2) AA 1.5 V NiMH rechargeable batteries (BAT 026),  

4 mA nominal current drain, 50 hours per charge approx.,  

FM  

FM  

Mic  

Indicator Volume  

Jack  

recharges in 14–16 hours, uses CHG 200 Charger  

Pre-tuned, field–tuneable, 72 MHz - 76 MHz*.  

Pre-set channels are E (72.9 MHz) and G (75.7 MHz).  

Wide-band, 75 kHz, 75 µS de-emphasis  

± 120 kHz  

4 µV at 12 dB Sinad with squelch defeated,  

squelches at 10 µV for min. 50 dB S/N ratio  

100 to 10 kHz, + 3 dB  

50 dB at 10 uV  

Integral with earphone cord  

35 mW, max. at 16 Ω  

3.5 mm mono phone jack  

R31 Top  

Operating Freq’s:  

FM Deviation:  

AFC Range:  

Sensitivity:  

Williams Sound  

®

Hearing Helper  

Freq Response:  

Signal-to-Noise Ratio:  

Receive Antenna:  

Audio Output:  

Output Connector:  

Squelch:  

Set to turn off audio under weak or no signal condition  

Red LED, turns on in the presence of a carrier  

Carrier Detect Ind:  

Controls:  

Volume:  

Tone:  

Rotary, On/Off/Volume  

3-way slide switch; Lo: flat response (20 Hz), Mid: -3 dB at 235  

Hz, Hi: -3 dB at 730 Hz  

R31 Front  

Channel:  

Indicators:  

2-way slide switch; Ch 1 = 72.9 MHz, Ch 2 = 75.7 MHz  

On/Off and FM  

Tone  

Control  

Channel  

1 or 2  

Mic Connector:  

3.5 mm mono phone jack, supplies positive DC for Williams  

Sound electret mics  

Microphone:  

Plug mount electret, omnidirectional, with windscreen, 3.5 mm  

mono phone plug (MIC 014)  

Mic Volume:  

Note:  

Approvals:  

Warranty:  

Rotary control  

Specifications are electrical performance  

FCC, WEEE  

5 years, parts and labor**  

*

FOR THE HANDICAPPED.  

DISCLAIMER: FCC RULES LIMIT USE OF THIS EQUIPMENT TO AUDITORY ASSISTANCE  

R31 Back  

**90 days on accessories.  

NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!  

©2007, Williams Sound Corp. MCAT 005B  

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