Sonova USA CAMPUS Manuel
Technical Note
systems
communication
Development
Manuel
Campus S FM Transmitter (TX2S)
US Version
Distribution: Montena EMC SA, CH-1728 Rossens, Mr Manfred Portman
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TN010906.doc
V1
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06.09.01
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Name Date Visum
F. Marquis 06.09.01 FMa
F. Marquis 06.09.01 FMa
F. Marquis 06.09.01 FMa
Manuel
Campus S FM Transmitter (TX2S)
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V1.0 06.09.01 New document all
systems
communication
Development
Technical Note
Manuel
Campus S FM Transmitter (TX2S)
US Version
Doc.:
Vers.:
Page:
Date:
TN010906.doc
V1
2 of 5
06.09.01
Background
Hearing impaired persons use hearing aids (HA), which are electroacoustic amplifiers including a microphone
and an earphone and having frequency response and dynamic characteristics specific to each hearing loss.
BTE (Behind-The-Ear) hearing aids have the possibility to be connected to an external microphone, by
means of electrical contacts placed on the bottom of the apparatus.
A wireless solution for a remote microphone still exists: an FM radio receiver is connected to the HA, via the
electrical contact system for the external microphone. This FM radio receiver can be either :
• In form of a little box, self powered by its own battery, and connected to the contact system by a
cable (for example Microvox R),
or
• A new system, fully miniaturised (Phonak Microlink), having the form of a piece of sugar, powered
by the hearing aid battery, an clipped on the bottom of the BTE-HA.
A previous FM transmitter (Microvox TX2) is still in use for application in schools. The microphone is
connected with a cable to the small transmitter having the form of a little box. The transmitter is fixed to the
clothes by a clip and the microphone by a small cord around the neck or a needle to the shirt.
The Campus S (TX2S) is a more convenient remote microphone for hearing impaired persons. Campus S
has an integrated synthesizer which allows to change the frequency of the transmitting channel.
TX2S is the development name of Campus S.
Product description
The Phonak Campus S is a FM transmitter (channel bandwidth of 25 kHz) for FM receivers, as the Phonak
MicroLink or MicroVox, connected to hearing aid instruments. Its frequency for north america is from 216 to
217MHz.
The Campus S is equipped with 2 audio inputs:
• Microphone-input for speech transmission (teacher)
• Audio-input for external audio source (CD-player, radio, ...)
The microphone can be switched as omnidirectional or directional.
The Campus S has 2 modes of operation: off and active (transmitting). The status of the Campus S is
indicated with the LCD display. When in off sate, the LCD display is blank. When transmitting, the Channel
number is indicated on the LCD display.
It can manually be switched on and off.
The Audio-input adds the left and right channels of a stereo signal to generate a mono signal.
The Campus S is powered by a prismatic NimH accumulator. A DC power supply (wallcharger) is used to
charge the accumulator. The Campus S is protected against polarity inversion and false voltage (too high or
AC).
The microphone cable is used as transmitter antenna.
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