Telex SR-50 Stereo Receiver User Manual
Contents
1. Channel RF Power Unbalanced Input Level Balanced Input Option Balanced Input Level CHANNEL SELECTION Turn the ST 300 on by touching the POWER button The ST 300 is de signed to return to on if power is disconnected while the unit is on This 1s so the unit can be switched on and off with a power strip or rack power The LCD display will light up and show the Chan nel Audio Meter Frequency and E D R if it has been enabled Press the SET button once and Chan nel letter will flash Use the UP and DOWN Arrow buttons to select the desired channel A Q Press SET when the desired channel is displayed and the channel is set The channel letter will stop flashing and the RF Power indicator will flash RF POWER SELECTION While the RF Power indicator 1s flashing press the UP ARROW for HIGH and DOWN for NORM the RF Power line will not be displayed NORM power should be used for small to medium sized venues and when ever multiple systems are being used Press SET when the power is set and the Unbalanced Input level will flash UNBALANCED INPUT LEVEL ADJUSTMENT If the unbalanced audio input will not be used with the Unbalanced Input Level flash ing use the UP button to set the level to OFF and press set to go to Balance Input Selection If the Unbalanced input will be used connect the in put now and apply audio content With the audio content playing and Unbalanced Input level flash ing watch the audio meter The2. 72 900 J 75 500 K L M N O P Q 75 600 75 700 75 800 75 900 74 700 75 300 75 400 Table 1 Frequencies Available TECHNICAL INFORMATION SR 50 RECEIVER GENERAL DESCRIPTION SR 50 The Telex SR 50 Receiver is a component of a sys tem which operates on 17 factory preset channels in the 72 to 76 MHz frequency band The receivers are designed to be used with Telex ST 300 and PST 170 transmitters but they can be used with other brands of transmitters in the 72 to 76 MHz band provided the frequencies match OPERATING FEATURES Volume OFF ON Control The thumbwheel con trol serves as both an off on switch and as a volume control HEADPHONE JACK VOLUME OFF ON CONTROL BELT CLIP BATTERY ORIENTATION BATTERY COMPARTMENT COVER Figure 2 Operating Features SR 50 The receiver is turned off when the control is in the extreme counterclockwise position when viewed from the rear and the volume is loudest when the control is in the extreme clockwise position Headphone Jack The receiver jack accepts a 0 140 inch 3 5 mm diameter miniature phone plug A variety of accessory units can be plugged into the jack for reception of the desired channels being transmitted Belt Clip The belt clip supplied is detachable by spreading the wire apart at the tops and removing one side of the clip form the case and then the other SPECIFICATIONS SR 50 Single
3. Channel Receiver Temperature Range Supply Voltage Battery Life 0 to 50 degrees C 2 3 Volts 2 AA Batteries 20 30 Hrs Alkaline 8 10 Hrs Nicad Sensitivity 12 dB SINAD 25 kHz deviation ee eeeeeeeeeeeeees 0 5u V typical lu V maximum Distortion Frequency Response 100 Hz 10 kHz Audio Output 10 Distortion less than 2 Less than 3 dB Variation Battery Input 2 0V 3 0V Voltage Controls and Connections SR 400 SYNTHESIZED RECEIVER General Description SR 400 The Telex SR 400 Receiver is a component of a system which operates on seventeen user selectable channels in the 72 to 76 MHz frequency band The receivers are designed to be used with the Telex ST 300 and PST 170 Transmitters Operating Features Volume OFF ON Control This thumbwheel con trol serves as both an off on switch and as a volume control The receiver is turned off when the control is in the extreme counter clockwise position when viewed from the rear and the volume is loudest when the control is in the extreme clockwise posi tion NOTE A headphone or other device must be plugged in the headphone jack in order to turn on the SR 400 This is to prevent draining the batteries if the switch is accidently left on _4 Volume OFF ON Switch Audio Output Jack Treble Control A push button treble control is pro vided to enhance higher frequency audio when the button is engaged indicated by 6 Headphone Jack The re
4. Max Transmitter Output Power 80 mV m at 3m Power Requirements 12 15V AC or DC 300 mA Dimensions 7 UA W x 1 3 4 H x 6 7 8 D B5DM508 EQUIPMENT SET UP ST 300 Synthesized Transmitter UNPACKING Unpack your sound enhancement system If there are any damages or shortages refer to the Warranty Service Information ST 300 TRANSMITTER LOCATION Select a suitable location for the ST 300 Transmitter Try to keep a clear unobstructed path between the trans mitter and receiver and allow plenty of free space around the transmitter antenna ANTENNA CONNECTIONS Connect the tele scoping antenna to the rear panel ANTENNA jack For best results the antenna should be vertically aligned Tighten the knurled ring to hold the antenna in place and extend the antenna to full length REAR PANEL Figure 6 Antenna Connection POWER CONNECTION Plug the AC power adapter into an electrical outlet Plug the other end of the cord into the power input jack on the rear panel of the ST 300 Figure 7 Connecting Power SYSTEM SET UP SESSION All of the channel and input selection functions are accessed from the front panel Press SET button once to begin a Setup Session Whenever a function is flashing the UP and DOWN buttons can be used to adjust it Once set the next function will start to flash To access a specific function press set until the function is flashing the features are accessed in the following order
5. N LOCATION Figure 14 Transmitter Antenna Placement TROUBLESHOOTING Reread the sections of this manual to make sure you have completed system set up properly If you are unable to solve the problem contact the dealer from whom you purchased the system for as sistance PROBLEM SOLUTION DISTORTION System s audio quality seems distorted at medium to high input levels Reduce audio gain on transmitter by adjusting the gain controls HISS System seems to produce a hiss which is undesirable Check the gain settings on the transmitter and the volume control on the receiver They may be too low DROPOUTS When moving around the area in which you will be using the system there seem to be locations where the signal swooshes or completely disappears Make sure the antenna is connected and fully extended Follow the location suggestions on page 15 Change the location of the transmitter antenna or avoid the bad area with the receivers INTERFERENCE System picks up signals other than the ST 300 Transmitter Make sure the Telex ST 300 is turned on this will usually eliminate the interference signal If problem persist with the transmitter ON try changing to another channel REDUCED DISTANCE System doesn t oper ate as far as it once did System doesn t operate as well as you think it should Receiver Battery is possibly in need of replace ment Transmitter antenna poss
6. Telex Operating Instructions Source Mote ST300 Transmitter SR 400 17 Channel Receiver SR 50 Single Channel Receiver TELEX INTRODUCTION WHAT IS THE TELEX SOUND ENHANCEMENT SYSTEM Transmitter The transmitter generates and ampli fies a RF Radio Frequency carrier signal modu lates this carrier with the microphone signal and radiates the modulated RF carrier Receiver The FM VHF receiver is tuned to the fre quency of the transmitter The receiver picks up the radiated RF signal from the transmitter through the antenna and converts the RF signal into audio volt ages for use with an earphone headphone button receiver neckloop etc The receiver frequency must be matched to the transmitter frequency SOUND SOURCE RF CARRIER SIGNAL WHAT FREQUENCY BAND DOES THE TELEX SYSTEM OPERATE IN The Telex Systems feature a synthesized transmitter and single channel or synthesized receivers operat ing in the VHF Band between 72 76 MHz See Ta ble 1 for standard frequencies available Each transmitter channel can be utilized by any number of receivers in any given area Up to eight simultaneous systems can be used and with proper placement of adjacent channels up to ten systems can be used EARPHONE Figure 1 Block Diagram of Typical Sound Enhancement System OFTEN ASKED QUESTIONS Question Can more than one system be used si multaneously Assen Yes but never on the same frequenc
7. Turn the receiver on and plug a listening device into the headphone jack A channel letter will show in the display 2 Press the set button once and the Channel indica tor will flash 3 Press the button and the Channel will cycle up match the channel to the transmitter being used ST 200 ST 300 PST 16 or PST 170 4 Press SET the channel indicator will stop flash ing and the channel is set Enhanced Dynamic Range E D R Operation The Telex ST 300 and PST 170 Transmitters are equipped with E D R Enhanced 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 re ceiver to be effective To engage the E D R function turn the SR 400 off with the volume control thumb wheel Press and hold the SET button while you turn the SR 400 back on The E D R symbol will be dis played in the lower right corner to indicate the mode is active Repeat the procedure to disable the E D R func tion 12 Change Lock Out The SR 400 SET button can be locked to prevent E D R activation and unintended channel changes The High Frequency Emphasis button will remain active at all times for the convenience of the user To engage the Lock Out Feature press the SET and buttons at the same time and hold them down for 10 seconds The padlock symbol will appear and the se
8. ceiver jack accepts a 0 140 inch 3 5 mm diameter miniature plug A va riety of accessory units can be plugged into this jack for listening Belt Clip The belt clip supplied is detachable by spreading the wire apart at the tops and removing one side of the clip form the case and then the other SET SWITCH BUTTON HEADPHONE JACK TREBLE CONTROL BATTERY COMPARTMENT VOLUME OFF ON CONTROL Figure 3 Operating Features SR 400 SPECIFICATIONS SR 400 17 Channel Synthesized Receiver Temperature Range 0 to 50 degrees C Supply Voltage 2 3 Volts 2 AA Batteries Battery Life 16 20 Hrs Alkaline 12 16 Hrs Nickel Metal Hydride 8 10 Hrs Nickel cadmium Frequency Response Sensitivity 12 dB SINAD 74 MHz Distortion Audio Output 10 Distortion Voltage Controls and Connections Volume OFF ON Switch Treble Control Switch Channel Selection Switch Audio Output Jack ST 300 SYNTHESIZED TRANSMITTER General Description The Telex ST 300 is a base station transmitter which operates in the 72 76 MHz band and accepts a wide range of audio input levels Operating Features sountiiiVete Personal Listening Systems Figure 4 Operating Features ST 300 Front and Rear Panel NN Un A WO N me ST 300 Front Panel Power Button Headphone volume adjustment Headphone Monitoring Jack SET Button Back Lit LCD Display UP and DOWN Adjustment Buttons ST 300 Rear Panel XLR Input Conne
9. ctor Accepts bal anced dynamic microphone 600 ohm line or 70 Volt line inputs Unbalanced Audio 1 4 Input Con nector Antenna Jack Accepts telescoping antenna supplied and optional HGA 1 Power Input Jack Accepts any source of 12 15 VAC DC 700 mA minimum 1 9 5 RF POWER HIGH CHANNEL 8 M UNBALANCED oN 6 10 5 0 3 6 AUDIO LEVEL 888dB p ee ee ee 2 Sc BALANCED AUDIO LEVEL 888dB f AUDIO LEVEL MIC 600W 70V FREQ i MHz _ 3 4 8 1 Channel Indicator 6 Unbalanced Audio Level 2 Audio Input Meter 7 Balanced Audio Level 3 Frequency Indicator 8 Balanced Input Selection 4 Enhanced Dynamic Range Model Indicator 9 Lock Out Indicator 5 RF Transmit Power High when lit Norm when not Figure 5 LCD Display Functions ST 300 Specifications AUO TIPUN eeren e AE E E EEE N Balanced Female XLR Mic Selected 2K ohm input impedance 0 5 mV 70 mV input range 600Q Selected 300K ohm input impedance 70 mV 7 Volt input range 70 Volt Line Selected 150K ohm input impedance 7 V 70 V input range Unbalanced Audio Input 10K Q input impedance 10 mV 1 0 VRMS input range RF Power Switch 80 000 uV m at 3m in H1 approx 25 000 uV m at 3m in Low AGC Range Signal to noise Ratio Pre Emphasis Maxmur Devido cece cece ce cece apt i cea ace oa ue aise ic east ada noes ettiemeaiauaneeanteat 25 kHz Frequency Control Crystal 005 tolerance Available Frequencies See Table 1 page 2
10. e Then wrap it in heavy paper or put it in a plastic bag If the original carton is not available place the unit in a strong carton that is at least six inches bigger in all three dimensions than the unit Fill the carton equally around the unit with resilient packing material shredded paper foam etc Seal it with gummed paper tape tie it with a strong cord and ship it by prepaid express United Parcel Service or insured parcel post to the Telex Service Department It is very important that the shipment be well packed and fully insured Damage claims must be settled between you and the carrier and this can delay repair and return of the unit to you Telex reserves the right to make changes in design and improvement on its product without as suming any obligation to install the same on any of its products previously manufactured Fur ther Telex reserves the right to ship new and or improved products which are similar to the form fit and function of products originally ordered T7 SSS a el FCC INFORMATION The Telex SR 50 Receiver and SR 400 Receiver are authorized under part 15 of the FCC Regula tions Changes or modifications to this equipment could void the user s authority to operate the equipment The Telex Model ST 300 Transmitter is authorized under Federal Communications Commission and Industry Canada Rules Licensing of the Transmitter if required is the users responsibility and licensability depends upon the users clas
11. ible located in correctly Receiver not tuned properly BATTERIES DON T LAST If using throw away batteries make sure they are alkaline If using nickel cadmium or nickel metal hydride batteries make sure they were fully charged when yo are using them and fully drained when you are done before recharging them HUM Audio System emits hum or buzz thru speakers and sound enhancement receiver Locate Transmitter away from the audio equip ment 16 CUSTOMER SERVICE INFORMATION If your receiver or transmitter should need servicing under the warranty please contact Customer Service Department TELEX COMMUNICATIONS INC 8601 East Cornhusker Highway P O Box 5579 Lincoln Nebraska 68505 5579 U S A Phone 402 467 5321 or 465 7021 All claims of defect or shortage should be sent to the above address When returning items for service you must provide date and proof of purchase such as a copy of the sales receipt to es tablish warranty A letter should be included outlining all symptoms and claimed defects Infor mation on how the equipment was installed and used is very helpful Please include your phone number and return address in case our service technicians need to contact you Units that have been modified cannot be accepted for repair Include all information requested by the Service Department Then pack the unit as follows Check the unit to see that all parts and screws are in plac
12. of Union Carbide Corporation DURACELL is a registered trademark of Duracell Inc ANTENNA INFORMATION Antenna Alignment Figure 10 Antenna Alignment Good and Bad _ 4 Antenna Placement Proper antenna placement probably has the most ef fect on your TELEX Wireless System s overall per formance Following the suggestions that follow should result in dropout free performance Figure 11 Distance Between Transmitter and Receiver Keep the distance between the transmitter and the receiver s as short as possible The greater the distance the weaker the signal Make sure the signal path between the transmitter and receiver s is unobstructed You should always be able to visually locate the antenna of the trans mitter at all times SIGNAL REACHES ANTENNA AT FULL STRENGTH WITH NO OB STRUCTIONS Figure 12 Keeping Site Clear to Antenna Attempting to operate the sound enhancement sys tem through or around walls ceilings metal objects etc will reduce system range and performance L SIGNAL REFLECTION OFF A METAL OBSTRUCTION CAUSES REDUCED SIGNAL AND MULTIPATH Figure 13 Operating Through Obstruction 15 DO NOT Mount the transmitter on or next to metal such as beams walls with metal studs etc This will detune the transmitter antenna which can result in loss of signal at the receiver LOCATIO
13. peak signal should not go above the 0 dB segment use the UP and DOWN buttons to adjust the input level so that the loudest input lights up the 0 dB segment When the level is set press the SET button and one of the Balanced Input Options will flash default 1s 70V BALANCED INPUT SELECTION If the bal anced audio input will not be used with one of the Balance Input Options flashing press SET so the Balanced Input Level is flashing Use the UP and DOWN buttons to set the level to OFF and press SET to end the setup session If the Balanced input will be used with one of the options flashing use the UP and DOWN buttons to select the correct input With the correct input dis played press SET and the Balanced Input Level in dicator will flash CAUTION Permanent damage can result if 70V line is used with the Input Selection improperly set BALANCED INPUT LEVEL ADJUSTMENT Make sure the Balanced Input Selection is set cor rectly then connect the input and apply audio con tent With the audio content playing and Balanced Input level flashing watch the audio meter The peak signal should not go above the 0 dB segment use the UP and DOWN buttons to adjust the input level so that the loudest input lights up the 0 dB segment When the level is set press the SET button and the Setup Session will end Enhanced Dynamic Range E D R Operation The Telex ST 300 Transmitter 1s equipped with E D R Enhanced Dynamic Range companded a
14. ransmitter should be installed separately as far as possible from the others Turn on the transmitter s with an active audio input Test walk a receiver through the expected listening area to verify coverage The system should now be ready for use EQUIPMENT OPERATION SR 50 SYNTHESIZED RECEIVER Operation of the SR 50 Receiver Try to keep a clear unobstructed path between the transmitter and receiver antennas for clear reception Plug in a unit such as an earphone headphone but ton receiver induction coil neckloop or audio input hearing aid into the headphone jack The cord acts as a receiving antenna Rotate the VOLUME OFF ON control slowly in the clockwise direction while monitoring the volume level When satisfied with the volume level place the Re ceiver in a pocket or clip it to your belt for conve nience Always return the VOLUME OFF ON control to the OFF position when the receiver is not in use to pre serve battery life and prevent battery leakage afl SR 400 SYNTHESIZED RECEIVER Operation of the SR 400 Receiver Try to keep a clear unobstructed path between the transmitter and receiver antennas for a clear trans mission 1 2 Figure 8 SR 400 Display 1 Channel Display A through Q and low battery indi cator 2 Lock Indicator see Change Lock Out 3 High Frequency Emphasis Indicator on when symbol is showing 4 Enhanced Dynamic Range Indicator Channel Selection 1
15. sification and frequency selected CAUTION Changes or modifications 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 opera tion of the device ACCESSORIES and PARTS Rack Mounting Kit RM S tor mounting one Sl SOO niapi e en ante take wate med nded ane ae on estos 71081 001 RM D for mouiiting tw OS L300 6 issih sigh oetaceineaceus essen A 71081 002 Earphone for SR 400 and SR 50 SEONG scans Picceer es aria eeepc ee ceance eae suai A ks sear Gulati 59840 005 Earphone for SR 400 and SR 50 CUS E E E EE E EE EE E E AA E E AANE 59840 001 Collapsible Lightweight Headphone for SR 400 and SR 50 RE D EA EEE AT N A TET ETE EE E neces I EA ease acme etna ss 59840 007 NL 4S Induction Coil NECKIOOD ssssicasitsaicacsaiedenvstccieasiinidea vis ilunesssnstnavstecacasieneeea vis ateresseseip E 71120001 Antenna Telescoping G Gare Es 6 6 eeur ee et reer nee en eee ere eee ee eee 877960 1 Belt Clip TO SRS O mA SRA ocra E E 358815 Power Supply HOI POOO e E A inca Passes eked ae cat wees T AEN A eee 730139 _18 TELEX TELEX COMMUNICATIONS INC 12000 Portland Ave South Burnsville MN 55337 U S A PN 804018 Rev D SEPT 2005 Made in U S A
16. t but ton 1s disabled To unlock the system press the SET and but tons and hold them for 10 seconds or until the padlock symbol disappears Low Battery Indication When there is approximately 10 of the battery life left a battery symbol will flash alternately with the channel letter in the LCD display When there is only 5 battery life left the bat tery symbol will constantly flash in the display Low Battery Display BATTERY REPLACEMENT The SR 50 and SR 400 Receivers use two 2 AA batteries When the batteries are low the sound will be distorted Replace weak batteries with two fresh AA batteries and position them in the battery com partment as illustrated in Figure 9 For additional information refer to the Battery In formation Section NOTE If the unit is to be stored for any length of time make sure you remove the batteries from the unit BATTERY ORIENTATION BATTERY COMPARTMENT COVER Figure 9 Battery Installation SR 50 and SR 400 Ge BATTERY INFORMATION General Improper battery selection use installation and care are the cause of numerous wireless system failures Alkaline Batteries Alkaline batteries such as Mallory s DURACELL or Eveready s ENERGIZER provide the most reli able operation in wireless transmitters and receivers The use of low cost carbon zinc batteries is NOT RECOMMENDED ENERGIZER is a registered trademark
17. ting E D R function on page 9 The E D R feature can only be used with the SR 400 and must be active on both transmitter and receiver to be effective SET button does not work cannot change channel Lock Out is engaged press and hold UP and DOWN buttons until the padlock symbol disap pears MULTIPLE SYSTEM INSTALLATIONS As with any radio device interference can occur at any time The frequencies offered are shared with other legitimate users The severity of interference varies with the distance to the interfering station Multiple systems further complicate installations The follow ing steps are suggested in order to achieve best re sults in your installation 1 In order to determine whether your selected fre quencies have minimum interference Telex rec ommends that you first temporarily install the receivers in your proposed setting and monitor the channel for interference To do this with fresh batteries installed turn on your receiver but DO NOT turn on any other receiver or trans mitter at this time If audible interference is pres ent this may indicate another user on the channel Monitoring should be repeated for each channel that you propose to use DO NOT use channels that have interference 10 2 Set your transmitter s to channels with no or minimum interference Each transmitter must be set to a separate frequency For best results when using multiple transmitters each t
18. u dio 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 effective 1 To engage the E D R function turn the ST 300 off with the power switch Press and hold the SET button while you turn the ST 300 back on The E D R symbol will be dis played in the lower right corner to indicate the mode is active 3 Repeat the procedure to disable the E D R function Change Lock Out The ST 300 SET button can be locked to prevent E D R activation and unintended channel changes 1 To engage the Lock Out Feature press the UP and DOWN buttons at the same time and hold them down for 10 seconds The padlock symbol will appear and the set but ton is disabled 3 To unlock the system press the Up and DOWN buttons and hold them for 10 seconds or until the padlock symbol disappears AUDIO MONITOR Turn the Monitor volume control all the way down counterclockwise After the audio input levels have been adjusted Stereo headphones with a 1 4 in plug can be plugged into the Monitor jack If you wish to monitor the audio program material turn up the monitor volume con trol to the desired level The monitor control does not affect the transmitted audio level Problem Solution Transmission sounds compressed on SR 50 or SR 400 E D R function may be engaged on the ST 300 See set
19. y You will need to have different frequencies for ev ery receiver transmitter combination All transmit ters are factory set for specific frequencies uestion Is the system more sensitive in any one particular direction ae No the transmitter s antenna radiates equally in all directions but the signal is attenuated by your body walls or other surrounding objects The receiving antenna is essentially sensitive in all directions as well uestion Can the receiver receive other transmis sions when the transmitter is turned off Agree Yes it can Telex systems operate in the VHF Band between 72 76 MHz However it is not susceptible to radio wave skip CB ers or standard FM radio transmissions The frequency your system operates on 1s computer selected for least interference but there is no such thing as a 100 clear channel all the time any where in the U S A forever If the system is going to be used in a permanent fixed location it should operate interference free un til such a time or date when someone else begins using the same frequency If the system is going to be moving among various locations you may run into occasional frequency conflicts Whenever the system is in use the transmitter should be left on to prevent the receiver from pick ing up outside interference AVAILABLE FREQUENCIES CHANNEL FREQ in MHz A 72 100 B 72 200 C 72 300 D 72 400 E 72 500 F 72 600 G 72 700 H 72 800 I
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