Installation guide

Williams Sound
®
Helping People Hear
8
CONTROLS AND CONNECTORS
FRONT PANEL
POWER INDICATOR
Indicates that the transmitter has power available and that the unit is on.
AUDIO ADJUST CONTROL
Controls level of audio signal and is connected between the input amplifier and the audio
level processing circuit.
AUDIO LEVEL INDICATOR
A four-LED array shows audio level in 6 dB steps. Indicator is average responding and is
calibrated so that optimum level is reached when the amber 0 light usually blinks and the red
+6 light blinks occasionally.
RF CARRIER INDICATOR
The RF Carrier On Indicator shows when the transmitter is actually transmitting.
PHONES JACK
The Phones Jack monitors the processed, “as transmitted” audio. It accommodates standard
professional headphones with a 1/4" inch Tip-Ring-Sleeve (Stereo) plug. It can accept any
other type of headphone or earphone including those with Tip-Sleeve (Mono) plugs.
Earphones with 3.5 mm plugs can be used with a suitable adapter (i.e., Radio Shack Part
#274-367). Listening to this signal gives an accurate indication of the audio actually heard by
users.
REAR PANEL
AUDIO SELECT SWITCH
Input characteristics, audio processing mode, and input filter cutoff frequency are set by this
DIP switch. A chart of settings is shown in Figure 3 and on the top of the unit. “On” and
“Off” are labeled on the body of the DIP switches.
AUDIO CONFIG SWITCH
AUDIO PROCESSOR
HI PASS FILTER
AUDIO INPUT
BAL/UNBAL 70 V BAL/UNBAL 70 V
TRS PHONE
FLAT
SWITCH SETTINGS
COMPRESS
LIMIT ON
OFF
ON
ON
ON ON ON
ON ON ON
ONON
ONON
OFF
OFF OFF
34567821
OFF
OFF OFF
OFF OFF OFF
OFFOFFOFFOFFOFF
– 3 dB AT 200 Hz
– 3 dB AT 730 Hz
BAL/UNBAL LINE
BAL/UNBAL LINE
BAL/UNBAL LINE
BAL/UNBAL LINE
MIC W/SIMPLEX
MIC
3 PIN
Figure 3: Audio Select Switch Settings
Switch 1 selects between Limit
and Compress Modes
Switches 2 and 3 control the
Hi Pass Filter
Switches 4-8 must be matched
to your audio input
See page 13 for plug wiring diagrams.