Figure 3: T20 Front Panel Controls & Features
Audio Indicators:
Tape Out/Phones:
Amber LED "Ok" for nominal input signal level
1
⁄
4
" jack, 600 mV, 100
Ω
source impedance. Also drives
Red LED "Hi" for excessive input signal level
mono or stereo headphone. Monitors exactly what is being
transmitted.
FM Auditory AssistanceTransmitter
Williams Sound
Power
Audio Level
Transmit Status
-
+
Tape Out/Phones
Ok
Hi
Adjust
On
WB
NB
Power Indicator:
Audio Level Control:
RF Indicators:
Green LED
Rotary pot, screwdriver adjust,
Green LED "On" indicates transmitter RF is on
used with audio indicator lights
Amber LED "WB" indicates wide–band channel is selected
Amber LED "NB" indicates narrow–band channel is selected
Figure 4: T20 Rear Panel Controls & Features
Audio Inputs:
Unbal. Audio Inputs:
Remote Antenna Output:
All inputs are actively mixed into a single
Four screw terminals, three unbalanced
F-type connector for 75
Ω
Coaxial
signal, allowing use of mono, stereo,
line-level inputs,
Antenna (ANT 005) uses RG-59 cable.
Balanced Audio Input
Line
Mic
70V
FM Auditory AssistanceTransmitter
Select
Unbalanced
Audio Inputs
20 Hz
175 Hz
725 Hz
Hi-Pass Filter
Antenna
Power: 24 VAC, 60 Hz, 10VA
RF Power
75 Ohm
Made in USA
Williams Sound Corp.
Channel
COM IN 1
IN 2
IN 3
-12dB
Max
-6dB
1st
Digit
2nd
Digit
Use with TFP 016
Power Supply
Balanced Audio Input:
Combination 3-pin female
XLR/1/4" stereo jack, accepts
balanced or unbalanced microphone
and line level inputs, 25 V or 70 V
audio input
Input Selector Switch:
3-position slide-type, selects: mic/line/70 V
on combination XLR/Phone audio input
one ground, actively mixed
High-Pass Filter Switch:
3-position slide-type,
20 Hz, 175 Hz, or 725 Hz,
6 dB / octave roll-off
RF Output Switch:
3-position slide-type,
Full power, -6 dB, -12 dB
Power
Connection:
3-pin, Molex
connector for TFP
016 power supply
Channel Selector:
2 rotary switches set the operating
frequency
3 channel or 4 channel audio sources
jack
Williams Sound
®
Helping People Hear
7
Summary of Contents for PERSONAL PA System 500
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