Williams Sound PERSONAL PA Pro Wide-band System 275 User Manual Download Page 7

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Williams Sound

Helping People Hear

Phones

PPA T4 Professional FM Auditory Assistance Transmitter

Williams Sound

Power

-12dB -6dB

0dB

+6dB

Audio Level

Increase

Decrease

Too Hi

Audio Adjust

RF Carrier

Frequency Synthesized, Channel-Selectable

Phones Jack

1/4" jack, 220

source impedance. Drives mono or stereo

headphone. Monitors exactly what is being transmitted.

Power On Indicator

Green LED

RF Indicator

Green LED indicates transmitter RF is on

Audio Level Indicators

Four-LED array shows audio level in 6 dB steps. Optimum level
is reached when the amber

light usually blinks and the red

light blinks occasionally.

Audio Level Control

Rotary pot, screwdriver adjust,
used with audio level indicator lights

Model PPA T4 Auditory Assistance FM Transmitter

Line Out

FM Channel,

Power

Power: 24 VAC,

50-60 Hz, 10VA

Williams Sound Corp., Minneapolis, MN USA

(XLR) Bal. Mic

Bal./Unbal line or 70V

(TRS) Bal./Unbal .

Line or 70V

Audio Input

Antenna

75 Ohms

Plug

Audio Select

See chart on top.

To configure, see chart on top.

1 2 3 4 5 6 7 8

Balanced/Unbalanced Audio Input

Combination 3-pin female XLR/1/4" stereo jack, accepts
balanced or unbalanced microphone and line level inputs,
25 V or 70 V audio input

IMPORTANT: If you choose to connect to 70 Volt
Speaker line, be certain to set the Audio Select switch
correctly. Transmitter damage will occur if you do not.

Audio Select Switches

DIP switch, sets input characteristics, audio
processing mode, and input filter cutoff
frequency. (See top panel chart or Figure 3)

Line Out

Line level output of the fully
processed, as transmitted, audio.
Can be used for monitoring,
recording, or as a feed for other
equipment.

Power
Connection

3-pin, Molex
connector for TFP
016 power supply

FM Channel/FM Power Switches

DIP switch for setting channel frequency and
RF output power level. See chart on top of
unit for switch configurations (Fig. 3, page 8).

IGURE

2: T4 T

RANSMITTER

ONTROLS

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Summary of Contents for PERSONAL PA Pro Wide-band System 275

Page 1: ...Williams Sound Helping People Hear PERSONAL PA Pro Wide band System 275 Wireless FM Listening System Transmitter Model T4 Receiver Model R30 Installation Guide User Manual MAN 103 A ...

Page 2: ......

Page 3: ...CHOOSING AND CONNECTING AN AUDIO SOURCE CHOOSING AN AUDIO SOURCE FOR THE HEARING IMPAIRED CONNECTING THE POWER SUPPLY ADJUSTING THE AUDIO INPUT CONTROL AUDIO PROCESSOR OPTIONS 16 ASSURING EXCELLENT PERFORMANCE 17 RECEIVER USE INSTRUCTIONS 18 BATTERY INFORMATION 19 RADIO INTERFERENCE TUNING INSTRUCTIONS 20 SUGGESTIONS FOR RECEIVER MANAGEMENT 21 TROUBLESHOOTING GUIDE 22 WARRANTY 25 SYSTEM SPECIFICAT...

Page 4: ...tep 3 Choose a Channel Both the T4 Transmitter and R30 Receivers are set to 72 9 MHz at the factory unless otherwise specified However you may easily set the T4 to any of the 10 available channels using the FM Channel FM Power Switch You may wish to use a different channel if there is already another hearing assistance system or some other authorized radio service operating on 72 9 MHz in your are...

Page 5: ...the T4 s back panel The T4 will not operate if you install the cable upside down though no damage will result Neither the T4 nor its power supply are equipped with a power switch Because there is no wear out mechanism and power consumption is minimal continuous operation is not a problem Step 7 Adjust the Audio Input Control Play a compact disc or other good audio source through the complete sound...

Page 6: ...k up the sounds you want to hear and broadcast them over an FM radio signal The receivers pick up the broadcast up to 500 feet away Listeners may sit anywhere and can make the audio signal as loud as they wish without causing PA system feedback or disturbing others To avoid difficulties read through this manual as you begin to use the system Then save it for questions that arise as you continue to...

Page 7: ... Bal Mic Bal Unbal line or 70V TRS Bal Unbal Line or 70V Audio Input Antenna 75 Ohms Plug Audio Select See chart on top To configure see chart on top 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Balanced Unbalanced Audio Input Combination 3 pin female XLR 1 4 stereo jack accepts balanced or unbalanced microphone and line level inputs 25 V or 70 V audio input IMPORTANT If you choose to connect to 70 Volt Speake...

Page 8: ... those with Tip Sleeve Mono plugs Earphones with 3 5 mm plugs can be used with a suitable adapter i e Radio Shack Part 274 367 Listening to this signal gives an accurate indication of the audio actually heard by users REAR PANEL AUDIO SELECT SWITCH Input characteristics audio processing mode and input filter cutoff frequency are set by this DIP switch A chart of settings is shown in Figure 3 and o...

Page 9: ...e Ring of the 1 4 jack or to pin 3 of the XLR connector The shield is connected to the sleeve of the 1 4 jack or to pin 1 of the XLR connector The input impedance is approximately 20 KΩ and performance is improved with a low source impedance With most professional audio equipment connecting the input directly to a line level output is best UNBALANCED LINE Any unbalanced line level source can be co...

Page 10: ...roblems caused by inadequate immunity to RF in some audio equipment Williams Sound offers a document Technical Bulletin Buzz Or Hum In The Sound System FRM 531 giving suggestions for improving RF immunity in existing audio equipment POWER IN 21 VAC to 26 VAC only 50 or 60 Hz as used with the TFP 016 Power Supply included with system Current consumption is approximately 200 mA One side of power inp...

Page 11: ...enna ANT 024 REMOTE ANTENNA LOCATION TIPS Install the ANT 005 or ANT 024 with its elements vertical It should be near or within the listening area and somewhat above the seats However do not install the antenna directly overhead There is a null in the coverage area off the ends of the antenna The antenna is best installed on a wall 10 to 15 feet above the floor It may be located in the next room f...

Page 12: ...system or authorized radio service is operating on 72 9 MHz in your area In this case you may easily set the T4 Transmitter to any of the 10 available channels using the FM Channel Power Switch Remember receivers must also be set to the same frequency See page 22 for receiver tuning instructions IMPORTANT Some cities have other radio services licensed on hearing assistance channels and under FCC r...

Page 13: ... cable ENGINEERED INSTALLATIONS In an engineered audio system use good wiring practice to properly connect the audio feed as you would connect any other piece of high quality audio equipment See the section Avoiding Ground Loops and Choosing A Good Audio Source MULTI CHANNEL SOURCES By constructing a simple resistive mixer stereo or 3 channel sources can be connected to the T4 Additional channels ...

Page 14: ...tes a ground loop If other ground conditions are favorable ground loops can often be eliminated by using the T4 s balanced input amplifier even on unbalanced sources and connecting a capacitor in series with the audio line shield to the transmitter s ground This method also maintains good RF shielding Determining the effectiveness of this method for your installation usually requires experimentati...

Page 15: ...m operator should consider the expected audience and program material Figure 8 shows response curves for the compressor limiter circuitry A hearing impaired person s perception of what is too loud is usually similar to a normal hearing person s However they often don t hear soft sounds as well In other words their dynamic range is reduced To compensate the T4 s Audio Processor can compress the aud...

Page 16: ...e cable upside down Neither the T4 nor its power supply are equipped with a power switch Because there is no wear out mechanism and power consumption is minimal continuous operation is not a problem If you want to control power to the transmitter connect the power transformer to a switched 120 VAC supply or a master switched outlet for the entire sound system STEP 6 ADJUST THE AUDIO INPUT CONTROL ...

Page 17: ... 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 conn...

Page 18: ...ating the volume control in the direction of the arrow on top of the case The On indicator will light Turning the knob in the direction of the arrow will increase the volume Turning the knob against the arrow will decrease the volume To avoid depleting the batteries make sure the receiver is turned off when not in use If you re using the PPA 275 with an existing sound system make sure the sound sy...

Page 19: ...ersonal hearing aid USING A RECEIVER WITH A HEARING AID Williams Sound PPA Receivers can be used with hearing aids using three different methods NECKLOOP TELECOIL COUPLER Neckloops are cords which hang around the neck and couple magnetically with T Coil equipped hearing aids SILHOUETTE TELECOIL COUPLER These telecoil couplers are worn behind the ear right next to telecoil equipped hearing aids DIR...

Page 20: ... batteries installed in the receiver may be recharged in the receiver only if they are Nickel Cadmium batteries and only if the correct Williams Sound charger is used Recharge batteries only with a Williams Sound CHG 200A 3V Dual Multi Charger or the CHG 1600 Multiple Battery Charger Make sure the receiver is turned off during charging A complete recharge cycle takes about 14 hours Receivers shoul...

Page 21: ...re other radio services are known to exist is included with the transmitter Do not use frequencies that are known to be used by licensed radio services in your city either if they are on the list or if you discover one RF CONFIG SWITCH SWITCH SETTINGS FREQUENCY RF OUTPUT POWER ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON 72 100 MHz 72 300 MHz 72 500 MHz 72 700 MHz ...

Page 22: ...ivers R7 6N channels 1 6 are set to frequencies 72 1 72 5 72 9 75 7 74 7 and 75 3 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 To Change the Frequency to Another Channel Step 1 Set the transmitter to the channel desired and remove the antenna Step...

Page 23: ...int which will be much louder Tune back and forth to find the center of the point of best response to the program being heard Step 9 Mark down the date and if a new frequency has been chosen mark it down inside the receiver case for future reference SUGGESTIONS FOR RECEIVER MANAGEMENT Different types of facilities use varying approaches to receiver management and earphone sanitation Below are some...

Page 24: ...ource audio level or reset Audio Select switch to match the existing source level BUZZ OR HUM IN AUDIO Check to see if the buzz or hum is in the source If so correct or repair your audio source Check to see if there is an incorrect or defective connection from source If so correct your connections See page 13 14 for detailed instructions DISTORTED AUDIO Check to see if the source audio is distorte...

Page 25: ... 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 co...

Page 26: ...y to occur in Compress Mode but can also occur in Limit Mode To reduce this noise adjust the Audio Level carefully noting the Level Indicator The 6 LED should light occasionally Perhaps the transmitter is set for Compress when Limit Mode would be more suitable given the program material If so set the Audio Select switch for Limit BUZZ IN OTHER EQUIPMENT WHEN TRANSMITTER IS ON OR OFF This is not an...

Page 27: ...ducts that have been modified If you experience difficulty with your system call for Customer Assistance 1 800 328 6190 If it is necessary to return the system for service a Williams Sound representative will give you a Return Authorization Number RA and shipping instructions Pack the system carefully and send it to Williams Sound Corp 10399 West 70th Street Eden Prairie MN 55344 3459 USA Phone 80...

Page 28: ...cm W x 8 18 20 8 cm D x 1 72 4 4 cm H 3lbs 1 5 kg Color Black epoxy paint with white legends Rack Mount One EIA rack space high 1 2 space wide 1 2 units can be mounted in a single rack space with optional RPK 005 single or RPK 006 double Rack Mount Kits Power 21 VAC minimum 26 VAC maximum 50 or 60 Hz 4 8 VA nominal 10 VA maximum Wall mount transformer for 105 to 130 VAC included FCC ID CNMT4 Opera...

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