Installation guide

Williams Sound
®
Helping People Hear
10
unacceptable situation, use a connection scheme like those described in the section Avoiding
Ground Loops.
Set the Audio Select Switch for Line input when connecting to 2-16 Ω speakers. Set the
Audio Select Switch for 70 V when connecting to 25 V or 70 V speaker lines.
Speaker lines are most often equalized, making them an inferior signal source. Source signals
should not be equalized.
TAPE OUTPUT
A line level output of the fully processed, “as transmitted” audio is provided through this
jack. Use it for monitoring audio quality, providing a processed signal for recording, or for
other uses.
FM CHANNEL/FM POWER SWITCH
The channel frequency and RF output power level are set according to a chart shown in
Figure 4 as well as on the top of the unit. “On” and “Off” are labeled on the body of the DIP
switches. 10 wide band FM frequencies are available.
Once the FM Channel/FM Power Switch is set, no further adjustment is required. RF output
can be reduced to alleviate problems caused by inadequate immunity to RF in some audio
equipment. Williams Sound offers a document (Technical Bulletin: Buzz Or Hum In The
Sound System, FRM 531) giving suggestions for improving RF immunity in existing audio
equipment.
POWER IN
21 VAC to 26 VAC only, 50 or 60 Hz (TFP 016 Power Supply included with system).
Current consumption is approximately 200 mA. One side of power input is connected
directly to circuit common (Chassis).
RF CONFIG SWITCH
SWITCH SETTINGS
FREQUENCY
RF OUTPUT POWER
ON
ONON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON ON
ON
ON
ON
ONON
ON
ON
ONON72.100 MHz
72.300 MHz
72.500 MHz
72.700 MHz
72.900 MHz
74.700 MHz
75.300 MHz
75.500 MHz
75.700 MHz
75.900 MHz
FULL
HALF
QUARTER
OFF
ON
ON
ON
67834521
OFF OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF OFF OFF OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Figure 4: FM Channel Switch Settings
Switches 1-5 toggles control
frequency settings
Switch 6 is not used
Switches 7 and 8 control RF output
power. The factory setting is FULL, and
can be adjusted if conditions warrant.
See Troubleshooting Guide.
Remember: If you change the
transmitter frequency, you must also
change receiver frequencies.