Williams Sound specifications Hearing Helper, Personal FM Receiver Model PFM R31, Description

Hearing Helper™

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

mmjack 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.

Personal FM Receiver • Model PFM R31

Applications:

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

PFM R31 FM Receiver:

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)
Weight:	4.6 oz (130 g) with batteries
Color:	Royal blue, shatter-resistant polypropylene
Battery Type:	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
Operating Freq’s:	Pre-tuned, field–tuneable, 72 MHz - 76 MHz*.
	Pre-set channels are E (72.9 MHz) and G (75.7 MHz).
FM Deviation:	Wide-band, 75 kHz, 75 µS de-emphasis
AFC Range:	± 120 kHz
Sensitivity:	4 µV at 12 dB Sinad with squelch defeated,
	squelches at 10 µV for min. 50 dB S/N ratio
Freq Response:	100 to 10 kHz, + 3 dB
Signal-to-Noise Ratio:	50 dB at 10 uV
Receive Antenna:	Integral with earphone cord
Audio Output:	35 mW, max. at 16 Ω
Output Connector:	3.5 mm mono phone jack
Squelch:	Set to turn off audio under weak or no signal condition
Carrier Detect Ind:	Red LED, turns on in the presence of a carrier
Controls:
Volume:	Rotary, On/Off/Volume
Tone:	3-way slide switch; Lo: flat response (20 Hz), Mid: -3 dB at 235
	Hz, Hi: -3 dB at 730 Hz
Channel:	2-way slide switch; Ch 1 = 72.9 MHz, Ch 2 = 75.7 MHz
Indicators:	On/Off and FM
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:	Rotary control
Note:	Specifications are electrical performance
Approvals:	FCC, WEEE
Warranty:	5 years, parts and labor**

On

Mic Jack Indicator Mic

Volume

EAR	FM	Mic	MIC
	On
FM	Max Min		Max
Off

FM FM Mic Indicator Volume Jack

R31 Top

Williams Sound

Hearing Helper ®

R31 Front

Tone	Channel
Control	1 or 2

*DISCLAIMER: FCC RULES LIMIT USE OF THIS EQUIPMENT TO AUDITORY ASSISTANCE	R31 Back
FOR THE HANDICAPPED.
**90 days on accessories.
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!

©2007, Williams Sound Corp. MCAT 005B 1