Telex PST-170 User Manual

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Telex

Operating Instructions

elex

Personal Listening Systems

ST-170

PST-170 17 Channel Synthesized Transmitter

PST-170 SPECIFICATIONS

Number of Channels ·············17User Selectable Channels Power Output ·············80,000 uV/M at 3 meters, maximum Antenna ···················Permanently attached trailing wire Modulation ·······················FM,+/-25KHzDeviation Frequency Response (System) ············100Hzto10,000 Hz

Audio Input:

Microphone, 7.75 mV RMS input for 25 KHz deviation. Impedance, 10 K Ohms, nominal. Aux. Input, 100 mV. Unbalanced, 100K Ohms, nominal.

Audio Input Level ············0-42 dB attenuation in 6 dB steps Signal to Noise Ratio: ·······················Normal 58 dB

EDR enabled 77 dB

Pre-emphasis ····························115uSeconds Power ··············2AAAlkaline or Nickel Cadmium batteries Battery Life ······························8Hrs-Alkaline

4 Hrs - Nickel-cadmium

CHANNEL ASSIGNMENT

Channel # Freq. (MHz) Channel # Freq. (MHz)

A 72.1 J 75.5 B 72.2 K 75.6 C 72.3 L 75.7 D 72.4 M 75.8 E 72.5 N 75.9 F 72.6 0 74.7 G 72.7 P 75.3 H 72.8 Q 75.4

I 72.9

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ANTENNA

PersonalListening Systems

ST-170

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AUXILLIARY INPUT JACK

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BATTERIES

Front View

Side View

The PST-170 Transmitter uses two AA batteries. Position them in the battery compartment as illustrated. You can expect 8 hours of operation from alkaline batteries and 4 hours on nickel-cadmium batteries. Charge Pins are provided on the bottom of the unit that fit Telex drop in chargers.

CAUTION: Do not attempt to recharge alkaline batteries as this may result in personal injury.

BELT CLIP

BELT CLIPBELT CLIPBELT CLIP

BATTERY ORIENTATION

BATTERY COMPARTMENT COVER

NOTE: If the unit is to be stored for any length of time be sure to

remove the batteries from the unit.

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Transmitter Channel

The PST-170 Transmitter may be set to any one of 17 channels.

Two Transmitters cannot operate on the same channel un less separated by 300 feet (91 m) or more (which is the aver age maximum operating range). If two transmitters are operating on the same channel inside this perimeter, the re ceivers will pick up the FM signal of both transmitters, caus ing a squealing sound to be heard.

Antenna

The transmitter uses a flexible wire “trailing” antenna that is permanently attached to comply with FCC Part 15 Rules. Do not cut or lengthen the antenna. Do not coil the antenna and place in your pocket. This is a tuned antenna and modification will shorten the range.

Audio Input

There are 2 audio input jacks on the transmitter. One is the Auxiliary teachers aids or tape players to be used. The input jack is a 1/8 inch (3.5mm) stereo/mono jack. Typical input level is 100 mV RMS maximum for normal modulation. More than this in put will cause the audio to “limit” which may sound unnatural. Reduce the input level, if this should happen, by turning down the input device.

input designed to allow audio devices such as

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The second jack is the microphone input. This jack is located on the top panel “step” of the transmitter. The microphone is supplied with the transmitter but other types can be used as well.

SWITCH

BUTTON

MICROPHONE

JACK

SET

BUTTON

-dB

E.D.R.

Top View

SWITCH

OFF

POWER

SWITCH

ANTENNA

Frequency/Channel Considerations

As with any radio device, interference can occur at any time. The frequencies offered are shared with other legitimate us ers. Check the frequency/channel with a receiver to see if any interference is present. If interference is present, choose a different channel. The severity of interference varies with location and distance to the interfering station. If the interfer ence is weak on all channels, this is probably acceptable since the PST-170 will cover the interference and is unlikely to interfere with other users. Multiple Channel Systems re quire other considerations but each channel should be checked as above.

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Placement of the Transmitter and Microphone

Place the transmitter on the users belt or in their pocket, preferably with the antenna facing the receiver. Do not the antenna and put it in a pocket. This will severely reduce the operating range.

Place the microphone about 10 to 12 inches below the mouth of the user.

Transmitter Operation

Turn on the transmitter with the toggle switch on top of the PST-170.

LCD Display

1. Channel Display A through Q, low battery indicator and input level

2. Lock Indicator (see Change Lock Out)

3. Overmodulation indicator (when symbol is showing)

4. Enhanced Dynamic Range Indicator

5. Input level adjustment indicator

coil

-dB

E.D.R.

LCD Display

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Channel Selection and Input Adjustment

1. Turn the receiver on and plug a microphone into the mic jack.

A channel letter will show in the display.

2. Press the set button once and the Channel indicator will flash.

3. Press the button and the Channel will cycle up. Match the

channel to the receivers being used (SR-50, SR-100, SR-400 or check frequency chart to match other brands).

4. Press SET, the channel indicator will stop flashing and the in

put level will be displayed and flash.

5. Speak into the microphone while watching the display. The

symbol will be displayed when the input is overmodulating (too strong). Push the ARROW button to adjust the input level until the symbol shows just on the loudest speech.

6. When the input is adjusted, press SET and the display will

stop flashing and the channel will be displayed.

7. If the lights up during operations, it is indicating

overmodulation. Re-adjust the input level.

If the microphone and an auxiliary device is used at the same time, it is preferable to set the auxiliary input device with its own control.

Adjust the appropriate output level control until loud program material passages sound natural in the receiver. This allows sufficient "head room" to prevent peak distortion on loud in puts.

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Enhanced Dynamic Range (E.D.R.) Operation

The Telex PST-170 Transmitter is equipped with E.D.R., En hanced Dynamic Range (companded) audio. This mode greatly improves the Audio Signal to Noise Ratio when used with the Telex Model SR-400 receiver. The E.D.R. mode must be selected on both the transmitter and receiver to be effec tive.

1. To engage the E.D.R. function turn the PST-170 off with the

toggle switch.

2. Press and hold the SET button while you turn the PST-170

back on. The E.D.R symbol will be display in the lower right corner to indicate the mode is active.

3. Repeat the procedure to turn off the E.D.R. function.

Change Lock Out

The PST-170 SET button can be locked to prevent E.D.R. activation, and unintended channel changes.

1. To engage the Lock Out Feature, press the SET and ARROW

buttons at the same time and hold them down for 10 seconds.

2. The padlock symbol will appear and the set button is disabled.

3. To unlock the system, press the SET and ARROW buttons

and hold them for 10 seconds or until the padlock symbol dis appears.

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Low Battery Indication

1. When there is approximately 10% of the battery life left, a bat

tery symbol will flash alternately with the Channel letter in the LCD display.

2. When there is only 5% battery life left, the battery symbol will

constantly flash in the display.

System Walk Through

Now that the transmitter is set up, you should be able to hear the program material on the receiver. Walk the receiver through the area that it is intended to be used in. Check for any noise or interference that would cause undesired operation. Some of the causes of poor performance are listed below.

Transmitter antenna coiled up

Poor transmitter location

Poor receiver location

Interference

Local AC Line noise

RF “Trouble Spots”

Operating distance beyond system capability

Malfunctioning System, receiver or transmitter

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FCC INFORMATION

The Telex Model PST-170 is authorized under FCC Rules Part 15. Licensing of Telex equipment is the user’s responsi bility and licensablilty depends upon the user’s classification, and frequency selected.

CAUTION: Changes or modification made by the user could void the user’s authority to operate the equipment.

Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

ACCESSORIES

Description Catalog No.

OLM-10 microphone (supplied with PST-170) .......... OLM10

ELM-22 Micro Mini lapel microphone .............. 70925-001

RE92Tx Unidirectional lapel microphone ...........301456000

SCHS-745 headworn microphone ...................745TA4

BC-100 battery charger-2 pocket .................71216-000

(also fits SR-50/400 receivers)

Waist Belt ..................................17794-002

Cell Phone style belt clip ........................879518-1

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WARRANTY INFORMATION

Model(s)_________________________ Serial No(s).:_____________________ Date of Purchase __________________________________________________ Purchased From __________________________________________________ Address _________________________________________________________ City _______________________ State______________ Zip _______________

TELEX Communications, Inc. (“Telex”)warrants to the user, who originally pur chased the serialized product delivered with this card, that the product will be free from defects in material and workmanship for the following periods after such date of purchase. Material 36 months, workmanship 36 months. Micro phones, earphones, neckloops, cables & connectors are warranted for ninety days. Telex will, at its option, repair or replace free of charge such defective products subject to the following conditions:

1. Delivery of the product or parts postage prepaid to the Telex dealer, authorized ser-

vice facility or factory.

2. Determination by Telex that a defect exists and is covered by limited warranty. De-

fects due to alteration, repair by unauthorized persons, insertion of non-Telex parts, misuse, accidental damage, use of the equipment for purposes other than those for which it was designed, and the like, are not covered by this limited warranty and repairs thereof will be subject to normal service charges.

3. Repairs and replacement parts are covered under this limited warranty only for the

unexpired term of the original limited warranty.

4. Products purchased from unauthorized dealers are not warranted.

5. You must fill out and return the product warranty card to register the purchase date

of serialized items. A copy of the bill of sale showing the date of purchase must ac company all warranty work.

THIS LIMITED WARRANTY IS EXPRESSLY IN LIEU OF ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FIT NESS FOR A PARTICULAR PURPOSE WHICH EXTENDS BEYOND THE T ERM HEREOF. THE REMEDIES PROVIDED BY THIS LIMITED WARRANTY ARE THE ONLY REMEDIES AVAILABLE TO ANY PERSON. NO PERSON HAS ANY AUTHORITY TO BIND TELEX TO ANY REPRESENTATION OR WARRANTY OT HER THAN THOSE PROVIDED BY THIS LIMITED WARRANTY. TELEX SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES CAUSED BY FAILURE OR OTHER WISE OF THE PRODUCT.

Some states do not allow exclusions or limitations of incidental or consequential damages or limitations on how long an implied warranty lasts, so the lim itations or exclusions herein may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

FILL OUT AND RETAIN THIS PORTION FOR YOUR RECORDS

LIMITED WARRANTY (VALID UNITED STATES AND CANADA ONLY)

Detach Warranty Registration and mail to:

Telex Communications, Inc.

12000 Portland Ave. South,

Burnsville, MN 55337

WARRANTY REGISTRATION

Limited Warranty (Previous Page)

SOUND ENHANCEMENT SYSTEMS

Owner’s Name___________________________________________________________

Address_________________________________________________________________

City_____________________________ State__________________Zip_____________

Purchased From__________________________________________________________

Address_________________________________________________________________

City_____________________________ State__________________Zip_____________

Date of Purchase_________________________________________________________

Model No(s).:_____________________________ Serial No(s).:___________________

TELEX COMMUNICATIONS, INC. 12000 Portland Ave.South, Burnsville, MN 55337

PN 38110370 June 2004 Made in U.S.A.

Telex PST-170 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual