Telex RadioCom TR-300 User manual

Telex
Operating Instructions
PROFESSIONAL
WIRELESS
INTERCOM SYSTEM
TR-300, BTR-300
R

TABLE OF CONTENTS
INTRODUCTION...........................................................1
GENERAL DESCRIPTION..................................................1
BTR-300BASE 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-300SET-UP.........................................................13
ANTENNA INFORMATION................................................16
TR-300 SET-UP............................................................23
PRE-WALK-THRU CHECKLIST............................................24
SYSTEM OPERATION.....................................................25
BTR-300OPERATION....................................................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-300Base Station
and the TR-300 Portable Transceiver.
The RadioComModels BTR-300and TR-300
were specifically designed to provide the user
with a highly flexible wireless two-way com-
munication system with the capability to inter-
face with a wired intercom system and other
auxiliary audio.
At the BTR-300operator’s command, the
remotesmay communicate with each other,
with a wired intercom system or with an auxil-
iary system. The BTR-300Base Station with
its one transmit and four receive channels is
designed to operate in full duplex (simulta-
neous two-way communications) with up to
four TR-300 Belt Pack transceivers. See block
diagram in Figure 1.
Figure 1
Block Diagram of System
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The system operates on selected frequencies
within the 150-216 MHz band.
The BTR-300system is fully compatible with
a number of other wired intercom manufactur-
ers units. See the BTR-300Setup Section for
additional information.
The TR-300 Transceiver operates in the con-
tinuous 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 RadioComModel
BTR-300Base Station.
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BTR-300BASE STATION TRANSCEIVER
TECHNICAL INFORMATION
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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
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 mWTypical
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

FEATURES
The RadioComModel BTR-300isa Base
Station with one transmitter and four re-
ceivers. It is designed for portable two way
communication with the capability for inter-
face to other audio systems. Features include:
•An extremely flexible unit that has the capa-
bility to communicate at one time with up to
four portable stations and wired stations (in-
tercom 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 in-
terface 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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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 0.5 µV for 12 dB SINAD
IF Selectivity........................................................................ 3 dB at 30 kHz (4 pole MonolythicFilter)
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

CONTROLS and CONNECTIONS
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: 4 Pin XLRCon-
nector for Input/Output. The headset jack will
accept many Telex model headsets. Compati-
ble with other intercom headsets with four pin
XLRconnectors that are wired as shown in
Figure 2.
Figure 2
Headset XLRConnector Wiring
Local Headset Volume: Adjusts volume to
Local Headset. DOES NOT AFFECT MI-
CROPHONE GAIN.
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 illu-
minated whenever the talk function is on.
Local Microphone Gain Control and
OvermodulationIndicator: 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 se-
lected remotesand interfaces. The indicators
(Portable Transmit On) normally show the
presence of a portable transceiver in use on the
channel corresponding to that indicator.
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1
2
3
4

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 Con-
trol, 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 al-
ways 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 “RE-
MOTE” 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
Electretor Dynamic microphone.
Intercom Connectors: Connections to inter-
face the BTR-300with a wired intercom sys-
tem.
Auxiliary Output/Input Connectors:Can be
used for 2-way (four wire) input and output to
the BTR-300or as a simplex input or output.
Typical uses are 4 wire intercom’s, tape re-
corders, 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 rec-
ommended.
Speaker Volume Control: Screwdriver ad-
justable. Adjust clockwise to increase speaker
volume or counterclockwise to decrease
speaker volume.
NOTE:Leave setting counterclockwise if no
speaker is attached.
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TR-300 BELT-PACK TRANSCEIVER
TECHNICAL INFORMATION
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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 mWTypical
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 mWinto 600 ohms (Headset)
Distortion................................................................................................. Less than 1% at Rated Output

FEATURES
•Lightweight, small size and is
self-contained.
•2 separate antennas, one for transmit, the
other for receive.
•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.
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 unus-
able battery will not cause any illumination
at all.
OvermodulationIndicator: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.
Headset Jack: A four pin XLRconnector for
Input/Output. The headset jack will accept
many different Telex model headsets. Compat-
ible with other intercom headsets with four pin
XLRconnectors that are wired as shown in
Figure 5.
Charge Jack:Allows nickel-metal hydride
batteries to be charged without removing them
from the unit.
Figure 5
Headset XLRConnector Wiring
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Figure 6
External Controls, TR-300
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Figure 7
Internal controls, TR-300
INTERNAL CONTROLS (Refer to Figure 7)
Microphone Gain Control: Screwdriver ad-
justable by removing belt clip and prying out
the small rubber plug to the right of the screw
boss.
Dynamic/ElectretSwitch: This switch allows
selection of “D” when using a Dynamic Mi-
crophone or “E” when using and ElectretMi-
crophone.
Battery Compartment: Holds 6 AA batteries
in a removable battery holder (supplied).
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EQUIPMENT SET-UP
BTR-300SET-UP
UNPACKING
Unpack your BTR-300and TR-300 System. If
there are any damages or shortages, refer to
the “Warranty Service Information” section in
this manual.
INTERNAL INTERCOM SWITCHES
The BTR-300has internal switches that allow
it to accommodate intercom systems other
than what it was set to interface with when
manufactured. Product No. 71276XXXX is set
for Telex Audio Com and similar systems.
Product No. 71280XXXX is set for RTS 2
wire and similar systems. Units originally set
for Telex may be set to RTS and vice versa.
Both models may be set to interface with
Clearcom, and 4 wire RTS/McCurdymatrix
type systems. The following paragraphs ex-
plain how to change the switches if necessary.
Remove Cover:Remove the cover screws
(13) and lift off the cover.
DIP Switch: See Figure 8 and Table 1. Set the
DIP switch as shown in the table.
High/Low Switch:See Figure 8 and Table 2.
Set the high/low switch as shown in the table.
Intercom Switch:See Figure 8 and Table 2. Set
the switch to 2 wire for all 2 wire systems. Set
the switch to 4 wire if the BTRis to be con-
nected to a balanced 4 wire intercom system
through the Auxiliary input and output jacks.
Note:Do not connect both 4 wire and 2 wire sys-
tems at the same time. Loud feedback may result.
Replace Cover: Carefully align the cover and
replace the screws.
INTERCOM JACK WIRING
CONFIGURATIONS
See Table 3 for the wiring of the intercom and
auxiliary jacks.
Table 1
Table 2
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DIP SWITCH POSITION
123456789
Telex AudiocomONONOFFONOFFONOFFOFFON
RTS 2 wireOFFOFFONOFFONOFFONONOFF
ClearcomONOFFONONOFFOFFOFFONON
4 WireN/AN/AN/AN/AN/AN/AN/AN/AN/A
INTERCOMLOW/HIGHINTERCOM
TYPESWITCHSWITCH
Telex
Audio ComLow2 wire
RTSHigh2 wire
ClearcomLow2 wire
4 wireN/A4 wire

Table 3
Pin Wiring for Rear Panel Jacks
Figure 8
Internal Intercom Switches
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InternalAuxiliary Audio Out Auxiliary Audio Input Intercom Loop Thru
Switch(both jacks)
SettingsPin 1Pin 2Pin 3Pin1Pin 2Pin 3Pin 1Pin 2Pin 3
Telex Audio
ComGround600 ohm600 ohmGround2.2K ohm2.2K ohmGroundBalancedBalanced
BalancedBalancedBalancedBalanced
RTS 2 wireGround600 ohm600 ohmGround2.2K ohm2.2K ohmGroundChannelChannel
BalancedBalancedBalancedBalanced1 2
ClearcomGround600 ohm600 ohmGround2.2K ohm2.2K ohmGroundPowerAudio
BalancedBalancedBalancedBalanced
4 wireGroundBalancedBalancedGroundBalanced BalancedDo NotDo NotDo Not
Intercom IntercomIntercomIntercomUseUseUse
OutOutInIn

RACK MOUNTING
To rack mount the BTR-300base transceiver
do the following:
Remove the front two #6-32 x 3/8” screws
on each side of the transceiver as shown in
Figure 9.
Place the rack mount brackets (supplied) on
either side of the unit and insert three #6-32 x
3/8” screws for each bracket. Tighten the
screws securely.
Insert the BTR-300into your 19” rack enclo-
sure and insert four (4) #10-32 x 3/8” Phillips
pan head screws (supplied) in each corner of
the rack mount brackets and secure to your en-
closure.
Figure 9
Attaching Brackets for Rack Mounting
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ANTENNA INFORMATION
ANTENNA CONNECTIONS
The BTR-300is supplied with two (2) anten-
nas. One 5/8-wave antenna for Transmit and
one 5/8-wave antenna for Transmit and one
5/8-wave for Receive.
Assemble the 5/8-wave antenna by screwing
the two sections together as shown in Figure
10. Both sections of the BTR-3005/8-wave an-
tennas must be used. Leaving off the top sec-
tion will result in reduced range.
Figure 10
5/8-wave Antenna Assembly
To insure that the frequency of the antennas
match the receiver and transmitter of the
BTR-300, match the color dot on the antenna
with the color dot on the BTR-300
Attach the antennas to the antenna input re-
ceptacles unless the BTRis rack mounted.
Tighten the connector securely.
Figure 11
Attaching 5/8-wave Antenna
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RemotingAntennas: It will be necessary to
remote both the transmit and receive antennas
on the BTR-300when it is rack mounted.
Connect the coax cable assembly (not sup-
plied), to the receive antenna receptacle and
mount the 5/8-wave antenna. The antenna can
be attached to either a wall mount bracket or a
microphone stand bracket (not supplied). See
“Accessory” section for order information.
You will also need to remote the transmit an-
tenna in the same manner. Connect a coax ca-
ble assembly to the transmit antenna
receptacle. Mount the 5/8-wave antenna by at-
taching it to a bracket (not supplied).
Figure 12
RemotingAntennas when Rack Mounted
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ANTENNA POLARIZATION
The Telex Wireless Intercom System is “Verti-
cally Polarized”. This means both the trans-
mitting and receiving antennas should operate
in the vertical position.
Figure 13
Vertically Polarized Antennas
ANTENNA PLACEMENT
Proper antenna placement probably has the
most effect on you TELEX Wireless intercom
System’s overall performance. The following
suggestions will result in optimum perfor-
mance.
Proper placement of the TR-300 can be criti-
cal. The trailing antennas should “dangle”
freely. “Wadding” the antennas up and placing
them in a pocket, etc., will reduce system
range.
It is suggested that the unit be worn on the belt
or pocket with both antenna’s hung vertically
for best operating range and performance.
Figure 14
Proper Dressing of the Antennas
Keep the distance between the base
(BTR-300) and the belt pack (TR-300) anten-
nas as short as possible. The greater the dis-
tance, the weaker the signal. However, the
portables should be a minimum distance of 10
feet from the base station and each other for
best performance.
Make sure the “signal paths” between the
BTR-300and remotesare unobstructed. You
should always be able to visibly locate the an-
tennas for best performance.
Figure 15
Keeping Site Clear to Antenna
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