Williams Sound
®
Helping People Hear
22
R
ECEIVER
F
REQUENCY
C
HANGE
I
NSTRUCTIONS
Tuning for the R7 and R-16 Receivers is determined by a single tuning coil. (See Figure 10.)
A plastic tuning wrench (PLT 005) is needed to adjust the receiver tuning coil.
Most Williams Sound receivers, including R7’s, are set at the factory to 72.9 MHz. (Yours
may have been set to another channel when they were ordered.) To change the frequency of
R7 receivers:
Step 1:
The receiver must be tuned under moderate or weak signal conditions. Set the T4
Transmitter’s RF Output Power to QUARTER. (See Figure 9.) Play a CD or
cassette through the sound system, or have someone speak into a microphone.
Step 2:
Make sure the transmitter is set for the channel to which you want to tune the
receiver, then move 50-75 feet away from the transmitting antenna.
Step 3:
Open the battery compartment, then lift up on the battery flap to open the back of
the receiver. This will expose the circuit board.
Step 4:
Locate the tuning coil. (See Figure 10.) The only adjustable item in the unit, the
tuning coil is a small, square, bright metal can with a screwdriver slot in the top
center.
Step 5:
Use the earphone supplied with the receiver to listen for the transmitted signal.
Slowly and gently rotate the tuning coil with a plastic tuning tool
(PLT 005), Do not press down on the coil. When you find the signal transmitted by
your system, adjust for the loudest and clearest sound possible.
Step 6:
Re-tune all the receivers, marking the new frequency inside each’s case for future
reference.
Tuning Coil
This is a small, square, bright metal can with a
screwdriver slot in the top center. Using a plastic
tuning tool (PLT 005), rotate the Tuning Coil
slowly and gently. Do not press down on the
adjustment. When you find the signal transmitted
by your system, adjust for the loudest and clearest
sound possible.
F
IGURE
10: R7 R
ECEIVER
T
UNING
