Specifications

Williams Sound
®
Helping People Hear

2
Ideally, the TX7 Transmitter should be at ear-level height or above. The infrared light pattern
is cone-shaped as it leaves the transmitter, with the best reception inside the cone.
Sunlight can cause infrared interference in the form of a buzz, hiss, or static. Thus, the system
cannot be used outdoors and may not work properly inside if a lot of direct sunlight is present.
Closing drapes or blinds will help if sunlight is a problem.
Any number of receivers may be used with the TX7 Transmitter, but use only one transmitter
in a room at the same time. Otherwise, interference will occur.
STEP 2: CONNECT THE TRANSMITTER POWER SUPPLY
Plug the AC to DC
Adaptor cord into the “DC 12V” jack on the base of the TX7. Then plug
the Adaptor into an outlet. The red power indicator light on the TX7's front will go on. This
indicator light goes on when an audio signal of sufficient strength (approx. 10 mV) is sent to
the
TX7. It will go off 2–3 minutes after the audio signal is removed.
STEP 3: CONNECT THE TRANSMITTER TO THE AUDIO SOURCE
Plug the blue-banded end of the Audio Cable into the TV Microphone as shown in Figure 4.
The microphone has a velcro clip that can be attached near the loudspeaker of your TV.
The
Audio Cable’
s blue end can also be connected directly into an audio output from a
VCR
or
TV with the RCA Plug Adaptor supplied.
T
X7 Transmitter
Infrared Light “Cone”
RX7 Receiver
FIG. 2: INFRARED LIGHT PATTERN
3.5mm plug
3.5mm Plug
Audio Cable
(WCA 073)
AC to DC
Adaptor

(TFP 021)
DC 12 V Input
Mic Input
TV Microphone
(MIC 070)
RCA Adaptor
(CNA 008)
3.5mm Jack
Blue
Band
FIG. 4: TX7 (REAR VIEW)
Red Power 
Indicator