T
ECHNICAL
S
PECIFICATIONS
FM T
RANSMITTER
, M
ODEL
PFM T30
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, 12 hours approx. life
(OR)
Two (2) AA 1.5 V NiMH Rechargeable batteries (BAT 026),
70 mA nominal current drain, 10 hours per charge approx., recharges in 14–16
hours, uses CHG 200 Charger
Operating Freq’s:
Selectable, 10 channels, 72.1 – 75.9 MHz, internal DIP switch
Stability:
+ .005%, frequency synthesized, crystal reference, PLL
Modulation:
Wide-band FM, 75 kHz, 75 µS pre-emphasis
RF Output:
8000 µV/m at 30 m, max., 40 mW typical
FCC ID:
CNM T30
Freq Response:
100 to 10 kHz, + 3 dB at 1% max. THD
Signal–Noise Ratio:
55 - 60 dB, with R31 or R32 Receiver
Auto Gain Control:
40 dB range, 30 mV threshold
Transmit Antenna:
Integral with 40" microphone cord
Microphone:
Omnidirectional condenser, Lavalier-type, 40" cord,
3.5 mm mono phone plug (MIC 090)
Controls:
On/Off switch, slide-type
Mic Connector:
3.5 mm mono phone jack
R
ECEIVER
, M
ODELS
PFM R31 & PFM R32
Dimensions and
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–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
Note:
Specifications are electrical performance
PFM R31 Receiver Only
Mic Connector:
3.5 mm mono phone jack, supplies positive DC for Williams Sound electret
mics
Microphone:
Plug mount electret, omnidirectional, with windscreen, 3.5mm mono phone
plug (MIC 014)
Mic Volume:
Rotary control
Williams Sound
®
Helping People Hear
18
Summary of Contents for Hearing Helper PERSONAL FM System R31
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