Page 1
Telex
Operating Instructions
SR-50
Single Channel
Receiver
Page 2
SPECIFICATIONS
SR-50 Single Channel Receiver
Temperature Range ..................0to+50degrees C
Supply Voltage.................2-3Volts, (2) AA Batteries
Quiescent Current.............................20mA
Available Frequencies ............RefertoFrequency Chart
Sensitivity (12 dB SINAD
25 kHZ Deviation) ............0.5µ V typical/1µ V maximum
Adjacent Channel
Rejection ± 200kHz..................More than 35 dB Down
Image and Spurious
Rejection..........................More than 50 dB Down
Signal-to-Noise Ratio
1 mV input .............................More than 60 dB
Distortion..............................Less than 2%
Audio Frequency Response
100 Hz-10 kHz.....................Less than 3 dB Variation
Audio Output
@ 10% Distortion
@
@
2.0V
8 Ohm
32 Ohm
Controls and Connections Volume OFF/ON Switch
Receiver Jack (Audio Output)
15 mW
10 mW
3.0V
80 mW
50 mW
-1-
Page 3
OPERATING FEATURES
Volume OFF/ON Control
This thumbwheel control serves as both an off/on switch
and as a volume control. 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 as indicated
on the volume control.
Headphone Jack
The headphone jack accepts a 0.140-inch (3.5 mm) diameter miniature mono or stereo phone plug. A variety of accessory units can be plugged into this jack for reception of
the desired channel(s) 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 from the
case and then the other.
HEADPHONE JACK
R
Telex
A
CHANNEL
VOLUME OFF/ON CONTROL
-2-
Page 4
OPERATION
General
The Telex SR-50 single channel receiver operates on 17
factory preset channels in the 72 to 76 MHz frequency band
and is designed to operate with the Telex TW-6, AAT-2,
PST-16, ST-200, PST-170, and ST-300 transmitters.
To operate the SR-50 Receiver:
1. Select a suitable location for the receiver, and try to keep
a clear, unobstructed path between the transmitter and
the receiver antenna for clear reception.
2. Plug the earphone into the receiver jack.
3. Rotate the VOLUME OFF/ON control slowly in the clockwise direction while monitoring the volume level.
4. When satisfied with the volume level, place the receiver
in a pocket or clip it to your belt for convenience.
5. Always return the VOLUME OFF/ON control to the OFF
position when the receiver is not in use to preserve bat
tery life and prevent battery leakage.
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Page 5
BATTERY REPLACEMENT
BELT CLIP
BELT CLIPBELT CLIPBELT CLIP
BATTERY
ORIENTATION
BATTERY COMPARTMENT COVER
The SR-50 Receiver uses 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 compartment as illustrated.
The life of rechargeable nickel-cadmium batteries is 6 to 8
hours, and life of replaceable alkaline batteries is approxi
mately three times as long.
NOTE: if the unit is to be stored for any length of time,
make sure you remove the batteries from the unit.
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Page 6
FREQUENCY CHART
SR-50 FREQUENCIES
DASH No. CHANNEL FREQ. in MHz
-031 A 72.100
-032 B 72.200
-033 C 72.300
-034 D 72.400
-035 E 72.500
-036 F 72.600
-037 G 72.700
-038 H 72.800
-039 I 72.900
-040 J 75.500
-041 K 75.600
-042 L 75.700
-043 M 75.800
-044 N 75.900
-045 O 74.700
-046 P 75.300
-047 Q 75.400
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Page 7
FCC INFORMATION TO THE USER
The Telex Model SR-50 is authorized under Part 15 of the
Federal Communication’s rules. Any changes or modifica
tions made to this receiver could void the user’s authority to
operate the equipment.
OPTIONAL ACCESSORIES
Description Catalog No.
Earphone (single).............................59840-005
Earphone (dual) ..............................59840-007
Lightweight Headphone.........................59840-003
Full Cushion Headphone........................63510-021
Button Receiver and 30" cord ....................64115-001
NL-4 Induction Coil Neckloop ....................71120-001
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Page 8
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-
2. Determination by Telex that a defect exists and is covered by limited warranty. De-
3. Repairs and replacement parts are covered under this limited warranty only for the
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
THIS LIMITED WARRANTY IS EXPRESSLY IN LIEU OF ANY EXPRESS OR IMPLIED
WARRANTY, INCLUDING ANY IMPLIED WARRANTY OR MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE WHICH EXTENDS BEYOND THE TERM
HEREOF. THE REMEDI ES PROVIDED BY THIS LIMITED WARRANTY ARE THE
ONLY REMEDIES AVAILABLE TO ANY PERSON. NO PERSON HAS ANY AUTHOR
ITY TO BIND TELEX TO ANY REPRESENTATION OR WARRANTY OTHER THAN
THOSE PROVIDED BY THIS LIMITED WARRANTY. TELEX SHALL NOT BE LIABLE
FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES CAUSED BY FAILURE OR
OTHERWISE OF THE PRODUCT.
Some states do not allow exclusions or limitations of incidental or consequential dam
ages or limitations on how long an implied warranty lasts, so the limitations or exclu
sions 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)
vice facility or factory.
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.
unexpired term of the original limited warranty.
of serialized items. A copy of the bill of sale showing the date of purchase must ac
company all warranty work.
-7-
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Page 9
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Page 10
R
TELEX COMMUNICATIONS, INC. 12000 Portland Ave. So., Burnsville MN 55337 U.S.A.
PN 804054 June 2004 Made in U.S.A.
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