13
UNBALANCED LINE
A 1/4 inch Tip-Sleeve (2 conductor) phone plug is used.
8 Ω speaker lines can be connected to the balanced line input. It is usually better NOT to
connect to the sleeve of the plug and thus avoid creating a ground loop.
A 25 V, 70 V, or 100 V speaker line can be connected to the balanced line input using an
appropriate attenuator. “T” pads made with resistors yield better fidelity than speaker
matching transformers.
Note: The MOD 111 transmits audio with excellent fidelity. Therefore, be sure to connect
its input to a signal source that supply the highest quality audio your system can
offer. The signal should not be processed by an equalizer used for an
accompanying PA system.
The MOD 111 has excellent signal processing, so the use of an additional limiter
or compressor is not recommended.
INSTALLATION STEP 5: TESTING THE SYSTEM
Step 1: After the baseband cable, power cables, and audio source are connected, turn the
MOD 111 power switch on. The green power LED on the front of the MOD 111
should light.
Step 2: Make sure the sound system is on and your audio source is active. Adjust the
Audio Level Control. Check the quality of your audio source signal by listening
through the Phones jack on the MOD 111’s front. The MOD 111’s 10-segment bar
graph level indicator shows audio level in 3 dB steps at the input of the audio level
processing circuit.
Step 3: Look at the TX8 emitter panel(s). With the baseband signal and power connected,
two red lights should be visible from directly underneath the panel: the power
indicator on the right and the baseband indicator on the left. The baseband light
will go off if the modulator carrier goes off–as it will after 30 minutes of no audio.
Step 4: Hold a receiver near the “Infrared Test Out” LED on the front of the MOD 111.
Turn the receiver on and adjust the volume. You should be able to hear the audio
signal through the receiver. If not, make sure the CXR On Indicator is lit and there
is activity on the Level Indicator. If the lights are not flashing, check your audio
source or the setting of the input level switch and input level control. If the audio
lights are flashing, but you don’t hear anything from the receiver, try a different
receiver to be sure the receiver is working.
Step 5: Take a receiver into the listening area and walk around to check the reception.
Make sure the emitter and receivers are set to the same frequency. Make sure the
“eye” on the receiver is not covered up when in use. The receiver will not work if
it is placed in a pocket or purse; its eye must be able to “see” the emitter panel.
Williams Sound’s optional WIRM-1 Infrared Field Strength Meter may be used to
check signal strength if the system is operating on 95 kHz.
It may be necessary to adjust the angle of the emitter to obtain the best coverage. If
coverage is not adequate, add one or more WIR TX8 Emitter panels to the system.
(See page 10, If You Are Using More Than One Emitter)
(3 pages)
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