Telex TR-300, BTR-300 User Manual 2
Telex
Operating Instructions
Headset
Power
RadioCom
ä
Ext Intercom Aux Audio
1
Portable Transmit On
2
3
Portable Station Connect
TR-300
4
RadioCom
Volume
Headset Controls
ä
BTR-300
Talk
Push Twice to Latch
Gain
O/M
PROFESSIONAL
WIRELESS
INTERCOM SYSTEM
TR-300, BTR-300
R
TABLE OF CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BTR-300 BASE STATION TRANSCEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONTROLS AND CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
TR-300 BELT-PACK TRANSCEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CONTROLS AND CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
EQUIPMENT SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
BTR-300 SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ANTENNA INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TR-300 SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PRE-WALK-THRU CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
BTR-300 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
TR-300 OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
ENABLING AUDIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SETTING SYSTEM GAIN LEVELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SYSTEM WALK-THRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
BATTERY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CUSTOMER SERVICE INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
FCC INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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INTRODUCTION
GENERAL DESCRIPTION
This manual covers the BTR-300 Base Station
and the TR-300 Portable Transceiver.
The RadioCom Models BTR-300 and TR-300
were specifically designed to provide the user
with a highly flexible wireless two-way communication system with the capability to interface with a wired intercom system and other
auxiliary audio.
ANT
HEADSET
MICROPHONE
TR-300
TRANSMITTER
RF CARRIER
F
RF CARRIER
F
ANT
SIGNAL
SIGNAL
SIGNAL
SIGNAL
At the BTR-300 operator’s command, the
remotes may communicate with each other,
with a wired intercom system or with an auxiliary system. The BTR-300 Base Station with
its one transmit and four receive channels is
designed to operate in full duplex (simultaneous two-way communications) with up to
four TR-300 Belt Pack transceivers. See block
diagram in Figure 1.
WIRED
INTERCOM
ANT
ANT
BTR- 300
HEADSET
FM
ANT
ANT
RECEIVER
REC1REC2REC3REC
4
EARPHONE
EARPHONE
RECEIVER
F
R CARRIER
SIGNAL
TRANSMITTER
AUXILIARY
INPUT
Figure 1
Block Diagram of System
-1-
AUXILIARY
OUTPUT
MICROPHONE
The system operates on selected frequencies
within the 150-216 MHz band.
The BTR-300 system is fully compatible with
a number of other wired intercom manufacturers units. See the BTR-300 Setup Section for
additional information.
The TR-300 Transceiver operates in the continuous transmit mode with the audio activated by a switch. As many as four TR-300
belt-pack transceivers can operate in a fully
duplex network with one RadioCom Model
BTR-300 Base Station.
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BTR-300 BASE STATION TRANSCEIVER
TECHNICAL INFORMATION
SPECIFICATIONS BTR-300
Input Power (minimum) ....................................................................................12V AC/DC at 360 mA
Intercom Output ........330 mV (Low) or 1 V (Hi) RMS into 300 ohm load typical (at rated deviation)
Intercom Input (Gain Minimum) .........................................300 mV RMS typical (for rated deviation)
Auxiliary Output.............................................2 V RMS into 600 ohm load typical (at rated deviation)
Auxiliary Input (Gain Maximum) .........................................60 mV RMS typical (for rated deviation)
Local Headset Input.......................................................................................2 mV RMS input nominal
1.5 mV RMS input at compression (Dynamic)
Local Headset Output .............................................................32 mV maximum output into 600 ohmst
Speaker/Local Monitor Output (into 8 Ohms) ............................................2 Watts (at rated deviation)
Temperature Range ................................................................................-4°F to 130°F (-20°C to 55°C)
Dimensions.............................................................................................15.75” W x 1.75” H x 10.5” D
(40 cm x 4.5 cm x 26 cm)
Weight................................................................................................................................4.5 lbs (2 kg)
Transmit
RF Frequency Range ........................................................................................................150-216 MHz
RF Frequency Stability................................................................................Crystal Controlled, 0.005%
RF Power Output............................................................................................................50 mW Typical
Modulation...........................................................................................................FM, 3 KHz deviation.
115 micro-seconds Pre-emphasis
Transmit Antenna....................................................................................................5/8-wave (supplied)
SO239 connector on chassis
Modulation Limiter ................................................................................................Internal Compressor
Modulation Frequency Range ............................................................................300 to 5000 Hz ±2 dB
Radiated Harmonics and Spurious Emissions ..........................................................................-45 dBC,
Exceeds FCC Specifications
FCC ............................................................................................Type Accepted Under Parts 90 and 74
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SPECIFICATIONS BTR-300 (Cont.)
Receive
RF Frequency Range .......................................................................................................150-216 MHz
RF Frequency Stability................................................................................Crystal Controlled, 0.005%
Type ...........................................................................................Dual conversion superheterodyne, FM
RF Sensitivity ................................................................................Less than 0.6 µV for 12 dB SINAD
IF Selectivity ........................................................................3 dB at 30 kHz (4 pole Monolythic Filter)
Image Rejection ..............................................................................................................65 dB or better
Squelch Quieting ...........................................................................................................................90 dB
Squelch Threshold........................................................................................................1.0 µV (Internal)
Signal-to-Noise Ratio ....................................................................................................................90 dB
Receive Antenna .....................................................................................................5/8-wave (supplied)
SO239 connector on chassis
Distortion.................................................................................................Less than 1% at Rated Output
FEATURES
The RadioCom Model BTR-300 is a Base
Station with one transmitter and four receivers. It is designed for portable two way
communication with the capability for interface to other audio systems. Features include:
· An extremely flexible unit that has the capability to communicate at one time with up to
four portable stations and wired stations (intercom and/or other audio source).
· Powered by an external AC supply via the
power jack on the rear of the unit. It can
also be powered by any 12V AC/DC 700
mA source.
· Intercom connections with the ability to interface with most wired intercom systems.
· RF light indicator for each portable station.
· All metal case for superior shielding.
· Table or rack mountable.
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CONTROLS and CONNECTIONS
A
E
FRONT PANEL (Refer to Figure 3)
Power ON/OFF Switch: Push this switch
once to turn power ON; push it again to turn
the power OFF.
Power ON Indicator: The Power ON light is
illuminated when the Power ON/OFF Switch
is pushed in the ON Position.
Local Headset Connector: Four pin XLR
Connector for Input/Output (plug for Telex
units and jack for RTS units). The headset
jack will accept many Telex model headsets.
Compatible with other intercom headsets with
four pin XLR connectors that are wired as
shown in Figure 2.
MICROPHONE
GROUND (1)
4
1
3
2
BALANCED
AUDIO OUT
(3 AND 4)
MICROPHONE
AUDIO (2)
Plug for Telex Unit
MICROPHONE
BALANCED
UDIO OUT
(3 AND 4)
4
1
2
3
GROUND (1)
MICROPHON
AUDIO (2)
Mic On-Push-to-Talk/Lock-to-Talk Switch:
Enables the local headset microphone audio
function.
NOTE: DOES NOT control base station RF
transmit.
Local Push-to-Talk Indicator: Will be illuminated whenever the talk function is on.
Local Microphone Gain Control and
Overmodulation Indicator: A screwdriver
adjustable control is provided to control the
input level of the local headset mic. This input
is protected from overloads by means of a
gain compressor whose operation is signaled
by the gain light indicator.
Portable Enable Switches and Indicators:
When in the “IN” position, the Enable
switches allow the user of the corresponding
portable unit to be heard by others connected
to the system. When in the “OUT” position,
the respective portable will be muted, but this
portable will still be able to hear all other selected remotes and interfaces. The indicators
(Portable Transmit On) normally show the
presence of a portable transceiver in use on
the channel corresponding to that indicator.
Jack for RTS Unit
Figure 2
Headset XLR Connector Wiring
Local Headset Volume: Adjusts volume to
Local Headset. DOES NOT AFFECT MICROPHONE GAIN.
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External Intercom Switch, Level Control,
and indicator: This switch enables the wired
intercom interface when “IN”, and disables it
when “OUT”. For RTS intercoms, the “IN”
position is channel 1 and the “OUT” position
is channel 2. A screwdriver adjustable control
is provided to control the input level of the
wired intercom.
Auxiliary Audio Enable Switch, Level Control, and Indicator: The switch enables and
disables the Auxiliary interface when “IN”
and “OUT”, respectively. The function of the
level control here is the same as that described
for the intercom.
REAR PANEL (Refer to Figure 4)
Transmit and Receive Antenna Connectors:
Attach 5/8-wave antennas (supplied) to these
connectors; Antenna color should match the
“color dot.”
Transmit Switch: Slide switch that allows the
operator to select one of three transmit modes.
In the “OFF” position, the transmitter is always off. This mode may be used if the base is
functioning solely as a monitor. In the
“CONT” position, the transmitter is always
on. This continuous mode is recommended
over the “REMOTE” mode. In the “REMOTE” position, the transmitter is enabled
only when one or more portables are active.
Headset Microphone Select Switch: This
switch allows the user to select either an
Electret or Dynamic microphone.
Intercom Connectors: Connections to interface the BTR-300 with a wired intercom system.
Auxiliary Output/Input Connectors: Can be
used for 2-way (four wire) input and output to
the BTR-300 or as a simplex input or output.
Typical uses are 4 wire intercom’s, tape recorders, public address inputs or outputs.
Power Jack: For external AC supply adaptor
(supplied).
Speaker Jack: Allows the use of an external
monitor if desired. An 8 ohm speaker is recommended.
Speaker Volume Control: Screwdriver adjustable. Adjust clockwise to increase speaker
volume or counterclockwise to decrease
speaker volume.
NOTE: Leave setting counterclockwise if no
speaker is attached.
-6-
BTR-300
O/M
Gain
Talk
Push Twice to Latch
LOCAL MIC
INDICATOR
OVERMODULATION
LOCAL MIC GAIN CONTROL
LOCAL HEADSET VOLUME
PORTABLE ENABLE
SWITCHES AND INDICATORS
Headset Controls
Volume
LOCAL PUSH-TO-TALK INDICATOR
4
MIC ON PUSH-TO-TALK/
3
2
Portable Transmit On
Portable Station Connect
1
LOCK-TO-TALK SWITCH
AUDIO
AUXILIARY
Ext Intercom Aux Audio
ä
INTERCOM
EXTERNAL
Figure 3
Front Panel BTR-300
POWER ON
RadioCom
Power
INDICATOR
Headset
POWER ON-OFF SWITCH
LOCAL HEADSET CONNECTOR
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RECEIVE
Receive
Antenna
ANTENNA
COLOR DOT
INTERCOM CONNECTORS
ANTENNA CONNECTOR
Intercom
Intercom
PUSH
Intercom
Telex Communications Inc.
Power
Loop-Thru
Loop-Thru
Loop Thru
BTR-300
Volume
Transmit
AC/DC 12V
8
Speaker
MADE IN U.S.A.
Remote
Off
Cont
Elt
700 mA
POWER JACK
SPEAKER VOLUME CONTROL
SPEAKER / LOCAL MONITOR ( 8 MIN.)
Figure 4
Rear Panel BTR-300
TRANSMITTER SWITCH
AUXILIARY OUTPUT CONNECTOR
PUSH
AUXILIARY INPUT CONNECTOR
Transmit
CONNECTOR
TRANSMIT ANTENNA
Auxiliary
Audio Input
Antenna
Headset Mic
-8-
Dyn
Auxiliary
Audio Output
HEADSET MIC SELECT SWITCH
ANTENNA
COLOR DOT
TR-300 BELT-PACK TRANSCEIVER
TECHNICAL INFORMATION
SPECIFICATIONS TR-300
Overall
Power Requirements ..............................................................6 AA cells (Alkaline, NEDA, MN 1500)
Nickel-metal hydride optional
Current Drain....................................................................................................................typical 82 mA
Temperature Range ................................................................................-4°F to 130°F (-20°C to 55°C)
Dimensions...............................................................................................4.25” W x 4.125” H x 2.0” D
(108mm x 105mm x 51 mm)
Weight ..........................................................................................................13 oz (369g) with batteries
Transmit Antenna............................................................................................1/4-wave wire (attached)
Receive Antenna .............................................................................................1/4-wave wire (attached)
Transmit
RF Frequency Range ........................................................................................................150-216 MHz
RF Frequency Stability................................................................................Crystal Controlled, 0.005%
RF Power Output............................................................................................................50 mW Typical
Modulation........................................................................................................FM, 3000 Hz deviation,
115 micro-seconds Pre-emphasis
Modulation Limiter ................................................................................................Internal Compressor
Modulation Frequency Range .........................................................................300 to 5000 Hz +/_2 dB
Microphone Audio Input ..............................................................................................30 to 3500 ohms
Microphone Input Sensitivity.................................................................2 mV Dynamic, 4 mV Electret
Radiated Harmonics and Spurious Emissions ..........................................................................-45 dBC,
Exceeds FCC Specifications
FCC ............................................................................................Type Accepted Under Parts 90 and 74
Receive
RF Frequency Range ........................................................................................................150-216 MHz
RF Frequency Stability ......................................................................Crystal Controlled, 0.005% Type
Dual Conversion Superheterodyne, FM
RF Sensitivity .................................................................................Less than 0.5 µV for 12 dB SINAD
IF Selectivity ........................................................................................3 dB at 30 kHz (Ceramic Filter)
Image Rejection ..............................................................................................................70 dB or better
Squelch Quieting ...........................................................................................................................90 dB
Squelch Threshold........................................................................................................3.0 µV (Internal)
Signal-to-Noise Ratio ....................................................................................................................90 dB
Audio Output ......................................................................................32 mW into 600 ohms (Headset)
Distortion.................................................................................................Less than 1% at Rated Output
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FEATURES
· Lightweight, small size and is
self-contained.
· 2 separate antennas, one for transmit, the
other for receive.
CONTROLS AND CONNECTIONS
EXTERNAL CONTROLS (Refer to Figure 6)
Volume OFF/ON Control: This thumbwheel
control serves as both an off/on switch and as
a volume control.
Low Battery and Overmodulation
Indicator Light:
Low Battery Indicator: Part of the battery
check circuit. When the power switch is
placed in the “ON” position the light will
flash one or more times if the battery is
good. A poor battery will cause the light to
illuminate continuously and a bad or unusable battery will not cause any illumination
at all.
Overmodulation Indicator: Uses the same
light as the low battery indicator. During
the talk mode, if the microphone gain is too
high, the light will illuminate when talking.
Push-To-Talk, Lock-To-Talk Switch:
This switch enables the talk function.
Talk Indicator Light: (Labeled “talk”) will
be illuminated whenever the talk function on
the TR-300 is enabled.
· Push-to-Talk with Lock-to-Talk feature
switch for the TR-300 and Push-to-Transmit
with Lock-to-Transmit feature for the
TR-300P.
Headset Connector: A four pin XLR connector for Input/Output. (Plug for Telex, Jack for
RTS units). The headset jack will accept many
different Telex model headsets. Compatible
with other intercom headsets with four pin
XLR connectors that are wired as shown in
Figure 5.
MICROPHONE
GROUND (1)
BALANCED
AUDIO OUT
(3 and 4)
MICROPHONE
AUDIO (2)
Plug for Telex Units
MICROPHONE
GROUND (1)
BALANCED
AUDIO
OUTPUT
(3 and 4)
MICROPHONE
AUDIO (2)
Jack for RTS Units
Figure 5
Headset XLR Connector Wiring
Charge Jack: Allows nickel-metal hydride
batteries to be charged without removing them
from the unit.
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