User guide
Model PPA VP 37 Wide-Band FM Wireless Listening System
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Sound through receivers is loud, but distorted. Noise (room noise or electronic
noise) seems to grow after talking stops. Audio Indicator Light is continuously on.
• Turn the screwdriver-adjust audio level control on the front of the T27
transmitter counter-clockwise to decrease the audio level. The audio
indicator light should ash occasionally, but not be lit continuously.
Sound through the receivers is weak and noisy.
• Turn the screwdriver-adjust audio level control located on the T27 front
panel clockwise to increase the input signal strength. The audio indicator
light should ash occasionally.
• Increase the input signal level from the sound system.
Buzzing or humming noise in sound system.
• There is nothing wrong with the T27 Transmitter. One or more pieces
of equipment in the sound system are being disturbed by RF (Radio
Frequency) signals produced by the T27. The most likely suspects are
your amplier, mixer, or tape deck. The RF gets into the other equipment
primarily through the power cord, speaker wires, or unshielded inputs, all
of which can act as antennas. Try the following steps:
• Move the Transmitter away from the other sound equipment.
• Make sensitive equipment more immune to RFI/EMI. The manufacturers
of your audio equipment may offer application notes for this purpose.
Williams Sound offers a document giving suggestions for improving RF
immunity in existing audio equipment. (Technical Bulletin: Buzz Or Hum In
The Sound System, FRM 531) Unless you have the necessary technical
skills, this is best left to a qualied electronics repair technician.