Williams Sound PFM 350 RCH User Manual
Hearing Helper
™
Personal FM System • Model PFM 350 RCH
Hearing Helper™Personal FM System • Model PFM 350 RCH
ADAADA
©2006, Williams Sound Corp. MCAT
041B
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
Description:
Maximize a student’s ability to listen with the Personal FM System 350 RCH from Williams Sound.
Personal FM systems deliver the teacher’s message directly to the student’s headphones by way of
FM signal, eliminating background noise and other distractions. It’s perfect for classrooms, job
training, consultation and more. Portable, no wire, no hassle. Each PFM 350 RCH system has a
range of up to 150 feet, and will operate up to 60 hours at one time. Versatile 3.5 mm jack allow
for a variety of earphone and headphone options, or equip it with a neckloop and it is compatible
with most telecoil-equipped hearing aids. The PFM 350 RCH includes an R31 receiver, which features a sensitive environmental microphone: this gives the listener more flexibility on what they
want to hear. By turning on the environmental mic, they can listen to a nearby classmate speak
more clearly. Each PFM 350 RCH system includes a CHG 200A drop-in style charger for charging up
to (4) AA BAT 026
batteries (included).
Applications:
Classrooms • Job Consultation • Job Training • Tours • Group Meetings
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: 4.4 oz (125 g) with battery
Color: Royal blue, shatter-resistant polypropylene
Battery Type: Two (2) AA 1.5 V non-rechargeable Alkaline batteries (BAT 001),
70 mA nominal current drain, 30 hours approx. life
(OR) Two (2) AA 1.5 V NiMH rechargeable batteries (BAT 026), 70
mA nominal current drain, 20 hours per charge approx., recharges
in 14–16 hours, uses CHG 200 or CHG 1600 Charger
Operating Freq’s: Selectable, 16 channels, 72.1 – 75.9 MHz*, internal rotary switch
Stability: ± .005%, frequency synthesized, crystal reference, PLL
Modulation: Wide-band FM, 75 kHz pk, 75 µS pre-emphasis
RF Output: 8000 µV/m at 30 m, max., 40 mW typical
Freq Response: 200 to 10 kHz, + 3 dB at 1% max. THD
Signal-to-Noise Ratio: 55 - 60 dB, with R31 or R32 Receiver
Microphone Gain Control: 45 dB maximum, 18 dB minimum
Transmit Antenna: Integral with 39" microphone cord
Microphone: Electret type, 39" cord, 3.5 mm mono phone plug
Controls: On/Off switch, slide-type; Microphone Mute Switch, slide-type;
Compression Selector 1:1 or 2:1 with internal selectable jumper
Mic Connector: 3.5 mm mono phone jack
Compatible Receivers: PPA R35, PFM R31, PFM R32
Approvals: FCC, Industry Canada, RoHS, WEEE
Warranty: 5 years, parts and labor (90 days on accessories)
Note: FCC regulations, section 15.21, requires the user to comply with
the rules of transmitter operation. Any changes or modifica-
tions made by the user not expressly approved for compliance
may result in the loss of all privileges and authority to operate
the equipment.
PFM T32 FM Transmitter:
T32 Top
T32 Front
*DISCLAIMER: FCC RULES LIMIT USE OF THIS EQUIPMENT TO AUDITORY ASSISTANCE
FOR THE HANDICAPPED.
Hearing Helper
™
Personal FM System • Model PFM 350 RCH
Hearing Helper™Personal FM System • Model PFM 350 RCH
ADAADA
©2006, Williams Sound Corp. MCAT
041B
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
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
FCC ID: CNM R31
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
Warranty: 5 years, parts and labor (90 days on accessories)
PFM R31 FM Receiver:
Williams Sound
Hearing Helper
®
R31 Front
Tone
Control
Channel
1 or 2
R31 Rear
R31 Top
R31 Front
R31 Back
*DISCLAIMER: FCC RULES LIMIT USE OF THIS EQUIPMENT TO AUDITORY ASSISTANCE
FOR THE HANDICAPPED.
Mic Jack
FM
Indicator
FM Volume
EAR MIC
FM
FM
On
Min MaxOff Max
R31 Top
On Indicator
Mic
Mic
Volume
Mic
Jack
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