Williams Sound Stereo System PFM R31 User Manual

Hearing HelperPersonal 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  
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  
Mic Jack  
Volume  
Weight:  
Color:  
Battery Type:  
4.6 oz (130 g) with batteries  
FM  
Mic  
EAR  
MIC  
Royal blue, shatter-resistant polypropylene  
Two (2) AA 1.5 V non-rechargeable Alkaline batteries (BAT 001),  
14 mA nom. current drain, 80 hours approx. life  
(OR) Two (2) AA 1.5 V NiMH rechargeable batteries (BAT 026),  
14 mA nominal current drain, 50 hours per charge approx.,  
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  
On  
FM  
Off  
Max Min  
Max  
FM  
FM  
Mic  
Indicator Volume  
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:  
35 mW, max. at 16 Ω  
3.5 mm mono phone jack  
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:  
R31 Front  
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  
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**  
*DISCLAIMER: FCC RULES LIMIT USE OF THIS EQUIPMENT TO AUDITORY ASSISTANCE  
FOR THE HANDICAPPED.  
R31 Back  
**90 days on accessories.  
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!  
©2007, Williams Sound Corp. MCAT 005B  
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Hearing HelperPersonal FM Receiver • Model PFM R31  
Bid Specs:  
Not Currently Available  
Contact:  
United States  
Williams Sound Corp.  
10321 W. 70th Street  
Eden Prairie, MN 55344-3446  
Ph: 800-328-6190 / 952-943-2252 / FAX: 952-943-2174  
Canada  
Thorvin Electronics  
2861 Sherwood Heights Dr. Units 36-37  
Oakville, ON L6J-7K1 Canada  
Ph: 800-323-6634 / 905-829-3040 / FAX: 905-829-4196  
Asia, Australia, Latin America, Middle East, South Africa  
International Sales Department  
Williams Sound Corp.  
10321 W. 70th Street  
Eden Prairie, MN 55344 USA  
Phone: +1 952 224 7791  
Fax: +1 952 943 2174  
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!  
©2007, Williams Sound Corp. MCAT 005B  
3
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