Williams Sound T45 Manuel D’Utilisation

Personal PA

DSP FM Wideband Transmitter

Insufficient range, good reception near transmitter, poor at a distance

• Check to see if the transmitting antenna was installed as specified in this manual. If not, correct or replace the antenna. The signal

should be clearly audible up to at least a 100-foot distance with the ANT 005 or ANT 025.

• Make sure the transmitting antenna is not in an unsuitable location. Perhaps the transmitting antenna was installed inside a

metal enclosure or is separated from the reception area by electrically conducting objects. (i.e., steel stud walls, heating ducts,
substantial structural steel, or 2x2 or 2x4 ceiling grid.) In either case, reinstall the antenna according to installation instructions,
locating it outside metal enclosures and away from electrically conducting objects.

• Perhaps there is a strong interfering signal. If so, make sure the transmitter and antenna are correctly installed. Set the transmitter

to FULL power output. If this does not solve the problem, try operating the transmitter on a different channel/frequency.

Users must turn receiver volume controls way up (to 4 or 5) to get enough volume

• Perhaps there is insufficient audio level. If so, the audio level indicator will read too low because the audio level control is set

incorrectly on the transmitter. Correct the Audio Level control setting. See page 10.

• It could be that the audio input is not configured for the audio source being used. If not, correct the setting of the Audio Source

control menu. See page 15.

• Some users may not be helped by this system. Severe hearing loss may require using the system with a telecoil coupler (i.e.,

Neckloop) and personal hearing aid.

• Check your batteries. For non-rechargeable (alkaline) batteries, they may need replaced. If you are using rechargeable batteries,

make sure the batteries are fully charged prior to use.

Users complain of too much noise during soft audio. Dynamic range of music reduced too greatly.

• Check to see if the Audio Level control is set too high. This problem is more likely to occur in 2:1 or 1.5:1 Compression modes,

but can also occur in 1:1 Compression mode. To reduce the noise, adjust the Audio Level, carefully noting the Level Indicator. The
+6 LED should light occasionally.

• The transmitter could be set for High Compression (2:1) when Reduced Compression (1.5:1) or No Compression (1:1) would be

more suitable, given the program material. If so, set the Compression Ratio to 1.5:1 or 1:1 and see if this reduces the noise. See
page 17.

Buzz in other equipment when transmitter is on or off

• This is not an RF problem. Instead, it is likely caused by incorrect audio connections, a ground loop, or defective equipment. To

remedy, use proper audio wiring practice to make connections described on page 8.

Buzz or other noise in equipment only when transmitter is on

• This is likely an RF–induced disturbance in the other equipment. To remedy, try these steps in order until the buzz is eliminated:

1. Make certain the transmitter chassis is connected to the equipment cabinet rails. Buzz/hum in system may be experienced

when the T45 chassis is insufficiently grounded. In this case, install a ground wire to the T45 chassis and terminate to a
verified ground source.

2. Make sure antenna connections are secure.

3. Set the T45 Transmitter to MEDIUM power output on the RF Power menu choice.

4. Install transmitter at a distance from sensitive equipment.

5. Use a remote antenna (ANT 005 or ANT 024).

6. 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).