T800 SYS

Hearing Helper® FM Assistive Listening System

Product Highlights

  • Designed for the European marketplace
  • Preconfigured for use with R863 three-channel receivers


This large-area FM listening system is professional grade, designed for the European marketplace.  Will broadcast a speaker´s voice, music program, or audio wirelessly up to 122m (400’) to a listening audience.  Ideal for large venues where superior coverage is essential.  Set-up is quick an easy.  Audience participants use the three-channel R863 FM receivers to pick up the broadcast for language interpretation or hearing assistance applications.



System Includes

(1) T800 FM transmitter
(6) R863 three-channel receivers with AA batteries
(6) EAR 013 single mini earbud
(1) WCA 013 audio cable
(1) ANT 032 antenna
(1) IDP 008 ADA wall plaque
(1) 240 VAC power supply

(1) WLC 005 power cable

*All items can be purchased separately

Note: The operating frequency on the T800 system is designed for European markets. The system cannot be used in all countries. Check with your government´s radio regulations for 863 MHz operation.


T800 sys


  • Sleek, backlit LED display
  • Three channel selectable:  863.250/863.750/864.750 MHz
  • Headphone monitoring jack
  • Meets DDA requirements for hearing assistance
  • Accommodates any number of listeners
  • 3-year warranty (30 days on accessories)


R863 Architectural and Engineering Specifications

  • The R863 shall be a portable, belt-pack equipped wide-band receiver. The unit shall have three user-selectable operating frequencies of 863.25 MHz for CH 1, 863.75 MHz for CH 2 and 864.75 MHz for CH 3. The R863 shall be housed in a black polycarbonate impact-resistant enclosure and feature a 3.5mm ear jack that can accept stereo or mono earphones.
  • The receiver shall include an adjustable volume control, integrated on/off/channel selector and power ON indicator LED. The power ON LED shall flash to indicate low battery.
  • The receiver shall operate on two AA alkaline batteries for approx. 40 hours of operation or 30 hours when using Williams Sound NiMH rechargeable batteries (BAT 026). The receiver shall have drop-in charging points for charging with the optional CHG 3512.
  • The R863 shall have an operating range of approx. 30 meters (98 feet) when used with the T863 transmitter, and shall a signal to noise ratio greater than 50dB and 60 kHz deviation.
  • The R863 shall have CE, ETSI EN 301 357-1, ETSI EN 310 357-2 approvals, and be compliant with RoHS and WEEE regulations. The unit shall have a three year parts and labor warranty.*
  • The receiver shall be the Williams Sound model number R863.



115 mm H x 72 mm W x 30 mm T
(4.5" H x 2.85 W x 1.2" T)


85 grams (3 oz.), no batteries




ABS/Polycarbonate, shatter-resistant

Battery Type:

Two (2) AA 1.5 V Non-rechargeable Alkaline batteries
(BAT 001), 50 mA nominal current drain, 40 hours approx. life
Two (2) AA 1.2 V NiMH Rechargeable batteries (BAT 026),
50 mA nominal current drain, 30 hours per charge approx., recharges in 14–16 hours, uses CHG 3512 Multiple Battery Charger

Operating Frequencies:

CH 1 - 863.25 MHz; CH 2 - 863.75 MHz;
CH 3 - 864.75 MHz ( ± 30 kHz)

Operating Range:

30 meters (98.4 feet) with T863 transmitter


± .05 MHz, 0 - 50° Celsius

FM Deviation:

60 kHz ±5 kHz, transmitter input at 1 kHz, 2.5 mV


50 µS


< - 90 dBm @ 60 kHz deviation


-100 dB @ 6 kHz

Freq Response:

500 Hz - 5 kHz, ±3 dB


< 2.0% THD

Signal–Noise Ratio:

>50 dB ( ± 5 dB) with transmitter input at 1 kHz, 2.5mV


Internal wire monopole

Controls & Indicators:

Volume control knob: Channel selector (four position rotary switch): Position 1 is off; position 2 is CH1; position 3 is CH 2; position 4 is CH 3

Power on indicator: Red LED “on" indicates when receiver has power

Low battery indicator: Power LED flashes when batteries are low

Battery selector: Slide switch for alkaline or NiMH battery operation

Headphone jack:

3.5 mm jack, mono output, 8-32 ohm impedance

Charging Contacts:

Designed for use with CHG 3512 Battery Charger and CHG 3502


CE, RoHS, WEEE, ETSI EN 301 357-1, ETSI EN 301 357-2


3 years parts and labor (90 days on accessories)

T800 Architectural and Engineering Specifications

  • The T800 shall be microprocessor controlled with push button configuration.  It shall have an operating range of up to 400 ft.  It shall have channels operating at 863.250MHz, 863.750MHz and 864.750MHz and shall be compatible with Williams Sound R863 receivers.

Front panel

  • The T800 shall have a push button controlled LCD digital display.  The LCD shall show frequency, channel lock status and audio level.  Access to channel switching shall be on the front panel via the menu buttons.  There shall be a ¼" headphone jack with gain control to monitor audio input.

Rear panel

  • The T800 shall be powered by a switching AC power supply (included) or a 12 VDC power supply (not included).  It shall have a line level input with L & R RCA connectors and a combination ¼"TRS/ XLR balanced/unbalanced microphone input.  This microphone input will shall work with dynamic microphones only.  Both inputs shall have their own independent gain controls.  There shall be an RF output attenuator switch to reduce the RF output if needed.  The antenna connector shall be a 50Ω TNC.
  • The T800 shall have FCC, CE, ETSI EN301 357-1,2 and RoHS compliance and shall have a 3 year parts and labor warranty.  This Transmitter shall be the Williams Sound model number T800.



21.8 cm (8.6") W x 21.8 cm (8.6") D x 4.6 cm (1.8") H


1.32 kg (2.9 lbs)


Black with white legends


AC: 100 to 240 VAC, 50-60 Hz, 400 mA, power inlet IEC C14
DC: 12 to 13 VDC, 800 mA, 2.1 mm DC input jack

Power Switch:

Push ON - push OFF switch with red light

Temperature Range:

Operating: 0 C to 40 C (+32 F to 104 F)


-20 C to 70 C (-4 F to +158 F)

Operating Frequencies:

Selectable: Ch 1= 863.250 MHz, Ch 2 = 863.750 MHz, Ch 3 = 864.750 MHz, 13 other frequencies available (see manual)

RF Output:

5 to 10 dBm (full power switch)

RF Switch:

Low/ Full power switch on rear panel

LCD Display:

Backlit, Ch #, frequency, user name, audio level VU (indicated by 11 segments total)

Menu Push Buttons:

Menu, +Ch select, -Ch select, SET

Headphone Output:

Mono, 1/4" tip barrel jack, 0.35mW power into 33 ohms, level adjust on front panel


+/- .05 MHz (0 C to 40 C)

FM Deviation:

45 kHz (line input, L+R, 1 kHz, 0.5 Vrms)


50 µsec

Nominal Range:

Up to122 meters (400 ft) at RF switch full power with Williams Sound R863 receiver

Frequency Response:

Line input: 25 to 10.0 kHz +- 3 dB
Microphone input: 110 to 8.5 kHz +/- 3 dB. Dynamic microphone only

Signal/Noise Ratio (1 kHz):

Line input: > 50 dB
Microphone input: > 40 dB

%THD + noise (1 kHz):

Line input: < 0.4%
Microphone input: < 0.5%

Audio Processing:

2:1 compression (line or microphone input)

Audio Input:

Line input: mono, RCA jack x 2 (labeled left and right) Microphone input: Balanced/unbalanced, combo XLR (3 pin) or 1/4" TRS jack, Dynamic mic only

Audio Levels: (at FM deviation)

Line input: 0.5 Vrms (-6 dBV), rotary gain adjust rear panel at maximum
Microphone input: 10 mVrms (-40 dBV), rotary gain adjust rear panel at maximum

Common Mode Rejection:

Microphone input: > 22 dB @ 1 kHz, balanced input


22.9 cm (9") long, semi flexible, adjustable, removable, rear panel TNC type connector

Compatible Receivers:



CE, RoHS, WEEE, ETSI EN 301 357-1, 2


3 years*

Other Models

T800 -- Hearing Helper® Large-area FM Base Station Transmitter

Accessories for Hearing Helper® Large-Area FM Listening System

ANT 033 Remote Antenna Mounting Kit

BAT 001 AA Alkaline Battery

CHG 3512 Body-pack charger, 12 bay

RPK 005 Single rack mount kit

RPK 006 Dual rack mount kit

Products compatible with Hearing Helper® Large-Area FM Listening System

  • R863 - Hearing Helper® FM Receiver


Download/View Name Type Language
t800 Manual German Manuals Deutsch
t800 Specifications Specifications English
t800 Manual French Manuals Français
t800 Manual english Manuals English
t800 Manual Netherlands Manuals
t800 Specifications Netherlands Specifications
t800 Specifications Specifications Deutsch
t800 Specifications Specifications Français


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