™
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
1
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