Radio Interference / Tuning Instructions
The PERSONAL PA is usually not disturbed by other radio services. However, there are few clear or
exclusive channels for radio services. One of the unique features of the Williams Sound PERSONAL PA
System is that the operating frequency can easily be changed in the field to avoid interference. The
PERSONAL PA can be quickly tuned to any of eight available frequencies by your Williams Sound
Authorized Dealer. The Transmitter is changed first. Then the signal produced by the Transmitter is used to
tune the receivers.
Transmitter Frequency Change Instructions
Step 1 Unplug the power cord from the Transmitter and remove the antenna.
Step 2 Use a phillips-type screwdriver to loosen the two screws on the rear of the Transmitter.
Remove the cover. Slide the circuit board out of the case.
Step 3 Use the diagram on the next page to locate the frequency selector switches on the circuit
board. Locate the switch programming chart on the bottom of the Transmitter case.
Step 4 Use a paper clip or small screwdriver (not a pencil point) to move the switches to correspond
with the switch positions on the programming chart. Select a new frequency at least two
channels away from the one you are experiencing interference on. DO NOT TOUCH ANY
OF THE OTHER ADJUSTMENTS!
Step 5 Re-assemble the T
ransmitter and plug it in. Connect a tape player or radio to the transmitter
to provide a tuning signal for the receivers.
Receiver Frequency Change Instructions
The R7 receiver tuning is determined by a single tuning coil, and is stabilized by automatic frequency control
circuitry
. A tuning wrench (PLT 005) is needed to adjust the receiver tuning coil.
Step 1 Use the PPA transmitter as a tuning signal source. Make sure there is some kind of audio
input (tape or radio) to the transmitter so you have something to listen to.
Step 2 Disconnect the antenna from the transmitter. The receiver must be tuned under weak signal
conditions at enough distance from the transmitter to allow some noise to be heard.
Step 3 To expose the circuit board, open the battery flap first. The receiver back snaps open like a
book. Hold the receiver near the transmitter while beginning the tuning procedure.
Step 4 Use the diagram on the next page to locate the tuning coil. Use the earphone supplied with
the receiver to listen for the transmitter signal while you adjust the tuning coil with the tuning
wrench. Adjust the tuning coil slowly and carefully. Do not press down on the tuning slug.
Adjust for best audio quality.
Step away from the transmitter until some noise is heard. As you continue to move away
from the transmitter
, keep adjusting for best audio quality until no improvement can be
discerned.
Step 5 Re-tune all the receivers and mark the new frequency inside the case for future reference.
Page 12
(28 pages)
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