Williams Sound R7-4 Installation Guide download pdf (Page 16)

Williams Sound

Helping People Hear

ASSURING EXCELLENT PERFORMANCE

The PPA 250 consists of a transmitter and several receivers used to deliver an audio signal to

listeners who are hard of hearing. The audio signal is usually provided by equipment

manufactured and installed by others. The PPA 250 provides excellent audio performance

under most conditions. However, Williams Sound equipment does not correct faults in

incoming audio. This section is intended to help installers and users recognize proper

operation and correct faults whenever possible.

The following tests can be done without instruments to assure that a system is working

properly.

HOW TO RECOGNIZE PROPER OPERATION

Step 1: Play a compact disc through the complete sound system at a level that is typical of

normal operation.

Listen to the hearing assistance system using a receiver with a factory-supplied

earphone. Set the volume on the receiver at about 3. Comfortable listening is

usually achieved with a setting of 2, or even lower. If you have normal hearing, a

volume control setting of 3 will likely be too loud for comfortable listening. There

should be no audible distortion, hum or noise.

Williams Sound wide band FM systems transmit audio using the same technical

standards as FM Broadcast radio. Therefore, the received sound should be of high

quality. Using a suitable adapter (Radio Shack Part #274-361), you can connect a

professional headphone to a receiver for a critical evaluation.

Step 2: Pause or stop the CD.

There should be no significant increase in noise or hum immediately after the

sound is stopped.

Step 3: Play the CD again.

Listen to the system using a receiver. Check for coverage in the listening area.

Walk through and around the entire audience area. The sound in the receiver

should remain clear and noise–free within the audience area.

Some small spots in the listening area will seem to “dropout”, getting no signal.

This is normal and is caused by RF signal reflections from relatively large

electrically conductive objects. In most installations, the areas of reduced reception

are less than one foot wide and few in number. Moving the receiver only a few

inches usually restores reception.

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Williams Sound R7-4 Installation Guide Page 16