The PFM PRO and rechargeable PFM PRO RCH deliver superior audio directly to the ear, enhancing sound at home, work, or school – anywhere background noise or distance from the source makes listening difficult. Each system features 17 selectable channels on the 72-76 MHz band and has an operating range of up to 150 feet. A versatile 3.5mm jack allows for a variety of earphones and headphone options, and is compatible with neckloops and telecoil-equipped hearing aids (not included with system).
DISCLAIMER: FCC rules limit use of this equipment to auditory assistance.
NOTE: The PFM PRO and PFM PRO RCH systems are approved by the FCC for operation in U.S. markets. These systems cannot be used in all countries. Check with your government´s radio regulations for 72-76 MHz operation.
NiMH, 1.2 Volt, 1500 mAh
Mono, folding headphone
20 - 20kHz
Max Power Input
110 dB @ 1kHz
HED 023 (one pair)
15 g (0.5 oz)
1500O @ 1kHz
1.5 - 10VDC
20 - 18kHz
Max Input Sound Level
-56dB ± 3dB
Replacement Lapel Clip
4.1" L x 2.8" W x 1.1" D (104 mm x 71 mm x 28 mm)
2.6 oz (74 g), no batteries
Shatter-resistant PC/ABS plastic with textured scratch-resistant aluminum faceplate
Two (2) AA 1.5 V non-rechargeable Alkaline batteries (BAT 001-2), 75 mA nominal current drain, up to 30 hours battery life, or
Two (2) AA 1.5 V NiMH rechargeable batteries (BAT 026-2), 75 mA nominal current drain, up to 20 hours battery life per charge, recharges in 14–16 hours, uses CHG 3502 or CHG 3512 Charger
Selectable, 17 channels, 72.1 – 75.9 MHz*. Switchable 8 or 17 Channel Mode. (8-channel mode is used for simultaneous groups)
± .005%, frequency synthesized, crystal reference, PLL
Wide-band FM, 75 kHz peak, 75 µS pre-emphasis
80 mV/m at 3 m (max. allowed by FCC rules)
180 Hz to 13 kHz, ± 3 dB at 1% max. THD
65 dB (typical) transmitted
Integral with microphone cord
Electret type, 3.5 mm mono plug
OLED for status and menu information.
Status: Ch/Freq, Mic Audio Level, Auxiliary Input Audio Level, Battery Status, Mic Mute, Channel Lock, Dual-Preset mode.
Menu: Ch/Freq display mode select, Volume, Aux Input, Compression,
17 or 8-channel mode, screen time out, screen brightness, restore default settings
Momentary push button: push and hold 3 seconds for power On/Off, push and release for microphone mute On/Off.
Left, Right and Menu buttons for accessing and changing transmitter settings. Battery type switch (Alkaline or NiMH) located behind the battery compartment door.
Power LED - Green, flashes when battery is low
3.5 mm mono jack with electret mic bias, adjustable gain with
25 dB range
2.5 mm stereo jack, adjustable gain with 60 dB range
1:1 (off) or 2:1 (on) selectable in menu
The PPA T46 is FCC Part 15 compliant.
Effective July 11, 2016, the FCC has mandated tighter emissions limits on auditory assistance transmitters (72-76 MHz) manufactured or imported after this date to help avoid interference with and/or degradation of other airborne signals (All products manufactured prior to July 11, 2016, are compliant). Williams Sound FM transmitters – PPA T46, PPA T27 and PPA T45 (all models) – all have received a Grant of Certification from the FCC and are fully compliant/approved under this new mandate.