Williams Sound PPA R7 User's Guide download pdf (Page 24)

Williams Sound

Helping People Hear

RECEIVER (WIDEBAND) FREQUENCY CHANGE INSTRUCTIONS

Selecting a frequency for the R31, R32, R-35 and R7-4 receivers requires an adjustment to the internal

tuning coil(s). See Figure 18 for receiver types to locate the coils to be adjusted. A plastic tuning

wrench (PLT 005) will be needed to adjust these receiver tuning coils.

Most Williams Sound single channel Receivers are set at the factory to 72.9 MHz. The standard

four-channel receivers (R7-4), channels 1-4, are usually set to frequencies 72.1, 72.5, 72.9, 75.7 MHz

respectively.

The Receiver must be tuned with a weak and somewhat noisy signal. If tuned too close to the

transmitter, with a strong signal, the most accurate tuning of the receiver is not possible.

o Chang

e the F

equenc

y to Another Channel:

STEP 1: Set the transmitter to the channel desired and remove the antenna.

STEP 2: Connect an audio source to the transmitter such as a CD or cassette player or microphone.

STEP 3: Move the receiver about 25 feet away from the transmitter to set the tuning.

STEP 4: Open the battery compartment, then pull the battery door to the left like a book to open the

back of the receiver.

STEP 5: Locate the Tuning Coil (see Figure 18). Each tuning coil is a small, square, shiny metal can

with a screwdriver slot in a tuning slug in the top center. The Tuning Slug is usually black

or gray.

IC01

R30 R- 31 R-32

R7- 4

UNING COIL

Ferrite Tuning

"Slug"

FIG. 18

Channel Tuning

Alkaline

NiMH

R-35

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 35 36

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Williams Sound PPA R7 User's Guide Page 24