Telex TR-500, BTR-500, BTR-600C, TR-600C User Manual

Telex

Operating Instructions

RadioCom

ON

OFF

BTR-600C

TM

P

B

A

E
L

C

T

K

LOCAL

IN

IN OUT

SIDETONE

OUT

I/C

AUX

BELT PACK

™

RadioCom

BTR-500/600C

AUDIO

CHANNEL

1
AUTO
2

OUT

OFF

1

I/C

TELEX

RTS

AUX

IN

MIC

VOL

GAIN

TALK/

OM

TALK

2

ON

A

1B

CODE SWITCH

T

2

elex

HEADSET

TR-500/600C
Professional
Wireless
Intercom Set

R

Table of Contents

Introduction..........................................................................................................................................1

General Description.........................................................................................................................1

System Features...............................................................................................................................1

Base Station Transceiver.....................................................................................................................2

Controls And Connections...............................................................................................................2

Front Panel.................................................................................................................................2

Rear Panel..................................................................................................................................3

Specifications...................................................................................................................................4

Beltpack Transceiver...........................................................................................................................5

Controls and Connections................................................................................................................5

Specifications...................................................................................................................................6

Initial Equipment Set-Up....................................................................................................................7

Unpacking........................................................................................................................................7

Antenna Information........................................................................................................................7

Antenna Connections.................................................................................................................7

Antenna Polarization..................................................................................................................8

Distance Between Antennas ......................................................................................................8

Antenna Placement ....................................................................................................................8

Improving Reception/Increasing Range ..................................................................................10

Base Station Set-up.......................................................................................................................11

Location ...................................................................................................................................11

Rack Mounting.........................................................................................................................11

Local Headset Connection.......................................................................................................11

RF Transmit/Receive Channel Switches..................................................................................11

RF Transmit Mode Switch.......................................................................................................12

Intercom Type Switch..............................................................................................................12

Dual Listen Switches ...............................................................................................................12

Audio Channel Switch.............................................................................................................13

Telex In/Out Switch.................................................................................................................13

Auxiliary Switch......................................................................................................................13

Auxiliary to I/C Switch (program audio).................................................................................13

Code Switch (BTR-600C Only)...............................................................................................13

Interconnection to a Hard-wired Intercom...............................................................................14

Auxiliary Audio Connection....................................................................................................17

Power Connection....................................................................................................................17

Dummy Load...........................................................................................................................17

Beltpack Set-up..............................................................................................................................18

Headset Connection.................................................................................................................18

RF Transmit/Receive Channel Switches.................................................................................18

RF Transmit Mode Switch.......................................................................................................18

Code Switch (TR-600C Only).................................................................................................18

Battery Installation...................................................................................................................19

Pre-Walk-Thru Checklist..................................................................................................................20

-i-

Table of Contents (Continued)

System Operation...............................................................................................................................21

Base Station Operation ..................................................................................................................21

Power .......................................................................................................................................21

Push-to-Talk/Lock-to-Talk Switch...........................................................................................21

Local Headset Volume.............................................................................................................21

Microphone Gain.....................................................................................................................21

Dual Listen Level.....................................................................................................................22

Intercom Level.........................................................................................................................22

Auxiliary Level........................................................................................................................22

Sidetone Level .........................................................................................................................22

Beltpack Operation ........................................................................................................................23

Power/Local Headset Volume..................................................................................................23

Battery Check...........................................................................................................................23

Push-to-Talk/Lock-to-Talk Switch...........................................................................................23

Microphone Gain.....................................................................................................................23

Sidetone Level .........................................................................................................................24

Example System Configurations....................................................................................................25

Single Base Station AudioCom (Telex) System......................................................................25

Single Base Station RTS System .............................................................................................26

Six Base Station RTS System ..................................................................................................27

Eight Base Station Telex System.............................................................................................28

Single Beltpack to Single Beltpack System.............................................................................29

System Walk-Thru.............................................................................................................................30

Troubleshooting..................................................................................................................................31

Tech Tips.............................................................................................................................................32

Codes Settings and the BTR-600C................................................................................................32

Frequency Interaction ....................................................................................................................32

Microphone Gain Adjustment........................................................................................................33

Battery Information...........................................................................................................................33

Intercom System Specifications........................................................................................................33

Accessories..........................................................................................................................................34

Customer Service Information .........................................................................................................35

FCC Information ...............................................................................................................................36

-ii-

Introduction

General Description

The Telex Radiocom BTR-500 and BTR-600C
UHF Wireless intercom systems offer the ultimate
in reliable, high performance, high fidelity full du­plex communications.

The BTR-500 series includes the BTR-500 fre­quency agile base station, working with the TR-500
transceiver beltpack. The BTR-500 base station pro­vides full duplex communications with a single
beltpack. Sixteen BTR-500s, or more, may be oper­ated simultaneously. Also a single BTR-500 base
station can accommodate an unlimited number of
beltpacks operating in “Push-to-Transmit” mode.

The BTR-600C series has all the features of the
BTR-500 with the addition of digital modulation
and encryption for secure communications. Base
station and beltpacks can choose from over 65,000
user selectable security codes out of over 16 million
possible codes by means of four cipher code
switches on the units. Sixteen BTR-600C, or more,
may be operated simultaneously, permitting 16, or
more, discrete full duplex radio channels.

The BTR systems incorporate auto-switching 2
channel operation, permitting the beltpack operator
to choose between 2 separate audio channels of
communications, with the base station tracking the
beltpack selection. Auto-switching allows the user
the flexibility to create a party-line and a private
line within the same beltpack.

The BTR-500 and BTR-600C systems are perfectly
suited for stand-alone operation and also can inter­face with Audiocom® (Telex), RTS® TW, as well
as RTS Matrix systems and other 4 wire communi­cations systems. Clear-Com® intercom system may
also be interfaced to a BTR-500 and BTR-600C
systems through the use of a Telex to Clear-Com In­terface box, see “Accesories” for more information.
In addition to the external intercom systems inter­faces listed above, the base stations provide connec­tions for auxiliary balanced audio input and output.

The Radiocom BTR series has been designed for re­liable, efficient operation. Operating in the 520 to
760 MHz range, the units operate reliable at dis­tances of 1,000 feet. With available antenna systems
from Telex, the effective operating range can be ex­tended. The high efficiency beltpacks provide 12
hours of uninterrupted operation using standard al­kaline batteries.

System Features

· Compatible with Audiocom (Telex), RTS TW, RTS
Matrix, Clear-Com (with external interface box),
and other wired intercom types.

· Intercom loop thru jacks for connecting multiple
units.

· Full Duplex (simultaneous talk and listen) operation.

· Beltpack TR unit contained in a weather and shock

resistant die cast magnesium case.

· Digitally encrypted RF (Radio Frequency) link for
secure communication on the 600C version.

· Flexible power requirements. The base unit can be
powered by any 12 to 15 Volt, AC or DC, 400 mA
power source. An external AC wall supply is sup­plied with the unit.

· Two transmit and two receive RF channels to help
avoid radio interference.

· Base stations are table or rack mountable.

· Audio channel switch on the beltpack unit enables it

to remotely control the intercom channel on the base
unit.

· Two channels of audio.

· Beltpack batteries last up to 12 hours when using

standard AA alkaline batteries.

· Audio out jack for P.A. systems or other external au­dio systems.

RTS® and Audiocom® are registered trademarks of Telex Communications, Inc.
Clear-Com® is a registered trademark of Clear-Com Intercom Systems, Inc.

-1-

Base Station Transceiver

Controls and Connections

123

TM

RadioCom

RadioCom

ON

ON

B

P

B

P

E

A

E

A

L

L

C

C

T

T

K

K

LOCAL

OFF

OFF

BTR-600C

LOCAL

57

491011 14

AUDIO

AUDIO

OUT

OUT

IN

IN

CHANNEL

CHANNEL

1

1
AUTO

OUT

OUT

BELTPACK

BELTPACK

AUTO
2

2

I/C

I/C

IN

IN

AUX

AUX

SIDETONE

SIDETONE

86

Front Panel Controls and Connections

1. Power Switch - Illuminates when on.

2. Beltpack Light - Illuminates when a beltpack is transmit-

ting to base station.

3. Intercom In Level Control - Adjust for optimum level.

Intercom light #11 should just flash red on loudest
speech.

4. Intercom Out Level Control - Adjusts output to match

input level of wired intercoms.

5. Auxiliary In Level Control - Adjust for optimum level.

Auxiliary light #13 should just flicker from green to red
on loudest sounds.

6. Auxiliary Out Level Control - Adjusts output to match

input level of auxiliary equipment.

7. Sidetone Local Control - Adjusts level of voice feedback

to earphone when a headset is plugged into jack #18.

8. Sidetone Remote Control - Controls sidetone level in the

beltpack.

9. Audio Channel Switch And Lights -

A. “I/C” switch on rear panel set to Telex

“I/C 1 or 2" jack (and corresponding pins on ”I/C Loop
Thru"). In “Auto” position; allows selection of chan­nels 1 or 2 from the beltpack.

- Selects either

I/C

I/C

IN

IN

TELEX

TELEX

OUT

OUT

AUX

AUX

ON

ON

OFF

OFF

12

Figure 1

11.

12. Auxiliary Switch - Turns the auxiliary input on and off.

13. Auxiliary Light - Illuminates green when switch #12 is

14. Code Switch (BTR-600C Only) - Allows user to select

15. Volume, Headset - Controls volume on headset plugged

16. Talk/Overmodulation Light - Illuminates green when

17. Microphone Gain Control - Adjust so that light #16 just

18. Headset Connector - Standard “XLR” type. Plug for

15

17 18

16

HEADSET

HEADSET

MIC

MIC

GAIN

A1B

A1B

CODE SWITCH

CODE SWITCH

13

GAIN

2

2

VOL

VOL

TALK/

TALK/

OM

OM

TALK

TALK

19

Intercom Light - Flashes red when input level is too high.
See #3 for adjustment.

on. Flashes red when input level is too high. See #5 for ad­justment.

cipher code (over 65,000 available). Any combination of
letters and/or numbers may be selected except 0000. Data
is unencrypted when the setting is 0000. The code switch
settings on the BTR-600C and TR-600C must match ex­actly.

into #18

talk switch #19 is on. Flashes red when headset micro­phone is over modulated - See #17 for adjustment.

flickers from green to red on the loudest speech.

Telex units and jack for RTS units. Wired as follows:

Telex Units

B. “I/C” switch on rear panel set to RTS

channel 1 or 2 on both I/C jacks (and corresponding
pins on “IC Loop Thru”). In “Auto" position; allows
selection of channels 1 or 2 from the beltpack.

10. Intercom Switch - See settings below.

A. “I/C” switch on rear panel set to “Telex”

1. “Telex Out” Setting - Intercom is disconnected
from all “I/C” jacks on rear panel.

2. “Telex In” Setting - Intercom is connected to “I/C
Loop Thru” and “I/C 1 or 2" jacks. Channel 1 or 2
is selected by switch #9 or the channel switch on
the beltpack.

B. “I/C” switch on rear panel set to “RTS”

effect. All I/C jacks on rear panel are active on either
setting.

- Selects RTS

- Switch has no

(1) Microphone
Shield (-)

(2) Microphone
Audio (+)

(4) Headphone
Low (-)

(3) Headphone
High (+)

RTS Units

(4) Headphone
Low (-)

(1) Microphone
Shield (-)

(3) Headphone
High (+)

(2) Microphone
Audio (+)

Figure 2 Headset Wiring

19. Talk Switch - Press-to-talk, release to disable. Press and

release quickly to stay on.

-2-

Base Station

Controls and Connections - Rear Panel

I

/C

TELEX RTS

3

LISTEN

PUSH

DUAL

O
N

I/C 1

LEVEL

7

8

9

AUDIO
OUT

XMIT

MODE

REMOTE

CH2+2

O
F
F

CH2+1

CONT.

6

5

1

TRANSMIT

ANT.

A
B

TRANSMIT
CHANNEL

4

2

Controls and Connections - Rear Panel - BTR-600C

1. Transmit Antenna Jack - Color band on antenna must

match color dot on base station. Female “TNC” Connec­tor.

2. Transmit Channel Switch - Changes frequency of

beltpack (shown on Serial No. Tag). Must match receive
channel on beltpack.

3. Audio Out - “RCA” type jack

provides a high impedance out­put for an audio amplifier.

4. I/C Switch - Set for Telex or RTS type intercom systems.

See Figures 4 and 5.

5. Transmit Mode Switch -
A. “Remote” - The unit transmits only when the beltpack

is transmitting.

B. “Off” - The unit does not transmit.
C. “Continuous” - The transmitter is on continuously.

(Recommended Setting)

Ground

Audio Out

LOOP
THRU

1

6

6

9

9

5

I/C

10

Figure 3

15

RECEIVE

POWER

12-15V

AUX

AC/DC

13

14

132

SET TO "TELEX"

I/C 1

ANT.

A
B

RECEIVE
CHANNEL

1

6

1

6

PIN

1 GROUND
2 AUDIO
3 + AUDIO

SWITCH #4

5

9

5

9

2

1

3

I/C 2

(CHANNEL 2)

1

5

11

BTR-600C

PUSH

I/C 2

FCC ID. B5DM503
MADE IN U.S.A.
PATENTPENDING

12

(CHANNEL 1)

Figure 4

Intercom 1 and 2 Jacks - Switch set to Telex

1

6

5

9

A. CH1+2=OFF Both audio channels are iso-

CH2+1=OFF

lated from each other.

B. CH1+2=ON Audio channel 2 is mixed into

CH2+1=OFF

channel 1.

C. CH1+2=OFF Audio channel 1 is mixed into

CH2+1=ON

channel 2.

D. CH1+2=ON Both audio channels are

CH2+1=ON

mixed into each other.

6. Dual Listen Switches

7. Dual Listen Level Control-Adjusts level of audio mix.

8.&11.Intercom 1 and 2 Jacks -

A. I/C Switch (#4) set to Telex

- “I/C 1" or ”I/C 2" (and
matching pins on jacks 9 and 10) are selected by the
Audio Channel switch on the front panel or the Chan
nel switch on the base station.

If one or both intercom lines are not used, plug the
Telex dummy load(s) into the appropriate unused
jack(s).

2

3

IC/1

1

SET TO "RTS"

1

6

PIN

1 COMMON
2 CHANNEL 1
3 CHANNEL 2

SWITCH #4

5

9

132

IC/2

Figure 5

Intercom 1 and 2 Jacks - Switch set to RTS

B. I/C Switch (#4) set to RTS - “I/C 1" and ”I/C 2" are

connected in parallel (including matching pins on jacks
9 and 10). Channels 1 and 2 are selected by the Audio
Channel switch on the front panel or the channel
switch on the base station.

­If neither channel 1 or 2 are connected to other inter

­coms, plug the RTS dummy load into the “I/C 1 or 2"
jack. Do not use the dummy load if the unit is con

­nected to an RTS intercom system.

-3-

9. & 10. Loop Thru I/C - 9 pin D-sub jack. Wired as shown.

11. See #8.

12. Auxiliary Jack - 6 pin RJ-11 telephone type jack. Com

patible with “RTS Matrix” type intercoms.

PIN654321

13. Power Jack - 12-15 VDC, 400mA minimum or 12-15

VAC rms, 400mA rms minimum. Accepts 5.5 mm x 2.1
mm plug.

-

14. Receive Channel Switch - Changes frequency of receiver

(shown on Serial No. Tag). Must match transmit channel
on beltpack.

13. Receive Antenna Jack - Color band on antenna must

match color dot on base station. Female “TNC” Connec­tor.

NC

AUDIO IN -

AUDIO OUT -

NC

AUDIO IN +

AUDIO OUT +

Figure 6

Auxiliary Jack

BTR-500/600C

Specifications

RF Output .............................................40mWmaximum, 25mW typical

Temperature Range.........................................-4°F to 130°F (-20°C to 55°C)

Dimensions ............................8.25"W x 1.75"H x 11.25"D (21cm x 4.5cm x25.6cm)

Weight ................................................................4lbs. (1.8kg)

Modulation Type

BTR-600C..............................................................NFSK

BTR-500 .................................................................FM

Deviation

BTR-600C ...........................................Complies with FCC 74.861e6

BTR-500.............................................................±40 KHz

Frequency Response

BTR-600C ........................................................300-4500 Hz

BTR-500..........................................................300-8000 Hz

RF Frequency Stability .........................................0.005% crystal controlled

Modulation Limiter.................................................Internal Compressor

Microphone input sensitivity .................................................2.0-25 mV

Radiated Harmonic and Spurious.........................Meets or exceeds FCC specifications

Typically -45 dBc or better

RF Frequency Range ......................................520to608and614to760MHz

Receiver sensitivity ....................................Less than 0.5 uV for 12 dB SINAD.

I.F. Bandwidth

BTR-600C .....................................................230KHzat-3dB

BTR-500.......................................................150KHzat-3dB

Type..........................................Single Conversion Superhet, 10.7 MHz I.F.

Image Rejection........................................................70dBorbetter

Audio Output, Headset ............................................32mWinto 600 Ohms

Squelch

BTR-600C ......................................................Internal, 3.0 mV

BTR-500 .......................................................Internal, 1.5 mV

FCC...............................................................Transmit, Part 74

Receive, Verification, Part 15

FCCID....................................B5DM503(BTR-600C), B5DM505 (BTR-500)

-4-

Beltpack

1

Controls and Connections

2

3

5

4

TALK

AUDIO

F

F
O

O.M.

BAT/

1

CHANNEL

2

x

e

l

e

T

6

VOLUME

O

N

N

I

A

G

C

I

M

7

Controls and Connections

1. Volume Control and Power Switch - Turns power on

and off and controls headset volume.

2. Battery/Overmodulation Light - Flashes once when unit

is turned on if battery is good. If light stays on, battery is
low. If light does not flash, battery is dead.

Flickering red light when talking means microphone gain
is too high and speech will sound distorted. Adjust Mic
Gain control #7 so that the light barely flashes on the loud­est speech.

Figure 7

10. Headset Connector - Standard “XLR” type. Plug for T elex

13

12

11

9

10

units and jack for R TS units. Wired as shown.

(1) Microphone
Shield (-)

(2) Microphone
Audio (+)

(4) Headphone
Low (-)

(3) Headphone
High (+)

Telex Units

8

3. Talk Switch - Press to talk, release to disable. Press and

release quickly to stay on continuously.

4. Talk Light - Illuminates when Talk function is on.

5. Audio Channel Switch - The Audio Channel Switch en-

ables the beltpack user to switch between wired intercom
channels 1 and 2 on the base station.

6. Side Tone Control - (Only installed in special beltpack to

beltpack direct communications units). Adjusts level of
voice feedback to earphone for a headset that is plugged
into the jack #10. The “Remote Sidetone” on the base sta­tion controls the beltpack sidetone in standard units.

7. Microphone Gain Control - Adjust so the light #2 barely

flashes on the loudest speech.

8. Code Switch (TR-600C Only) - Allows the user to select

a cipher code (over 65,000 available). Any combination of
letters and/or numbers may be selected except 0000. Data
is unencypted when the setting is 0000. The code switch
settings on the TR-600C and BTR-600C must match ex
actly.

9. Battery Latch - Press down to release the battery pack.

Pack slides off in opposite direction.

(1) MICROPHONE
SHEILD (-)

(2) MICROPHONE
AUDIO (+)

RTS Units

(4) HEADPHONE
LOW (-)

(3) HEADPHONE
HIGH (+)

Figure 8

Headset Jack Wiring

11. Push-to-Talk/Push-to-Transmit - When the switch is set

to “Push-to-Talk”, the transmitter in the beltpack is always
on, but no audio signal is sent unless the Talk Switch #3 is
activated. The “Push-to-Talk” switch setting is the recom­mended position.

When the switch is set to “Push-to-Transmit", the trans­mitter is turned on when the Talk Switch is activated and
turned off when the talk switch is deactivated.

-

12. Receive Channel - Changes the frequency of the receiver.

It must match the Transmit Channel of the base station.

13. Transmit Channel - Changes frequency of the transmit

ter. It must match Receive Channel of the base station.

-5-

-

Beltpack

Specifications

RF Output.............................................................25mWtypical

Temperature Range.........................................-4°F to 130°F (-20°C to 55°C)

Dimensions............................4"Wx57/8"H x 1 5/8"D (120mm x 149mm x 41mm)

Weight ..................................................1lb.6oz.(625g) with batteries

Modulation Type

TR-600C ...............................................................NFSK

TR-500...................................................................FM

Deviation

TR-600C ............................................Complies with FCC 74.861e6

TR-500 ..............................................................±40KHz

Frequency Response

TR-600C..........................................................300-4500 Hz

TR-500 ...........................................................300-8000 Hz

RF Frequency Stability .........................................0.005% crystal controlled

Modulation Limiter.................................................Internal Compressor

Microphone input sensitivity .................................................2.0-25 mV

Radiated Harmonic and Spurious.........................Meets or exceeds FCC specifications

Typically -45 dBC or better

RF Frequency Range .................................520to608MHzand614to760MHz

Receiver sensitivity ....................................Less than 0.5 uV for 12 dB SINAD.

I.F. Bandwidth

TR-600C.......................................................230KHzat-3dB

TR-500 ........................................................150KHzat-3dB

Type..........................................Single Conversion Superhet, 10.7 MHz I.F.

Image Rejection........................................................70dBorbetter

Audio Output, Headset ............................................32mWinto 600 Ohms

Squelch

TR-600.........................................................Internal, 3.0 µV

TR-500.........................................................Internal, 1.5 µV

FCC...............................................................Transmit, Part 74

Receive, Verification, Part 15

FCCID.......................................B5DM506(TR-500), B5DM504 (TR-600C)

-6-

Initial Equipment Set-Up

Unpacking

Unpack your RadioCom System. A system package
should contain the following Items:

Quantity Descripton

Contact the shipper or your dealer immediately if
anything is damaged or missing. Fill out the regis­tration card and return it to Telex to properly regis­ter your unit.

1
1
1
2
1
2
1
1
2
4

Antenna Connection

BTR-500 or BTR-600C Base Station
TR-500 or TR-600C Beltpack
Wall Power Supply
Antennas (one Transmit and one Receive)
Interconnect Cable (9 pin to 9 pin)
Dummy Loads (3 pin XLR male)
Operating Instructions
Warranty and Registration Card
Plastic Screwdrivers
Rubber Feet

Antenna Information

The base station is supplied with two (2) antennas.
One 1/2-wave antenna for Transmit and one
1/2-wave for Receive. The antennas have TNC male
connectors.

The frequency range of the antennas should match
the receiver and transmitter of the base station.
Match the color code on the antenna with the color
code on the base station.

Attach the receive 1/2-wave antenna to the antenna
input receptacle labeled “Receive” on the right side
of the rear panel. The antenna should be vertically
aligned.

Figure 9

Attaching Receive 1/2-Wave Antenna

-7-

Attach the transmit 1/2-wave antenna to the antenna
input receptacle labeled “Transmit” on the left side
of the rear panel. The antenna should be vertically
aligned.

The antennas can be remoted for better signal path.
A Telex coax assembly and/or a signal splitter/
combiner with remote antennas may be required.
See “Accessory” section for ordering information.

NOTE: If your base station is to be located in a
shielded rack mount enclosure or other poor RF lo­cation, you must remote the 1/2-wave antennas with
coax assemblies or use a splitter/combiner (SC-600)
with special broad band antennas. See “Example
System Configurations” section for a multiple unit
system using a SC600 and broad band antennas.

Antenna Placement

Proper antenna placement probably has the most ef­fect on your TELEX Wireless Intercom System’s
overall performance. The following suggestions will
result in optimum performance.

Figure 10

Attaching Transmit 1/2-Wave Antenna

Antenna Polarization

The Telex Wireless Intercom System is “Vertically
Polarized”. This means both the transmitting and re­ceiving antennas should operate in the vertical posi­tion.

HEADSET

A1B

A1B

HEADSET

MIC

MIC
GAIN

GAIN

2

2

VOL

VOL

TALK/

TALK/
OM

OM

CODESWITCH

CODESWITCH

TALK

TALK

T

elex

I/C

I/C

AUDIO

AUDIO

IN

IN

TELEX

TELEX

OUT

OUT

OUT

OUT
IN

IN

CHANNEL

CHANNEL

R

R

RadioCom

RadioCom

1

1
AUTO

AUTO
ON

ON

I/C

I/C

AUX

AUX

B

P

B

P

OUT

2

OUT

2

IN

IN
E

A

E

A
L

L
C

C

ON

ON
OFF

OFF

T

T
K

K

AUX

AUX

BELTPACK

BELTPACK
LOCAL

LOCAL

OFF

OFF

BTR-600C

BTR-600C

SIDETONE

SIDETONE

ANTENNAS MUST BE VERTICAL

Proper placement of the beltpack can be critical.
The antennas should be in the open. Bending the an­tennas up and placing the beltpack in a pocket, etc.,
will reduce system distance.

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.

elex

T

Figure 11

Vertically Polarized Antenna

Distance between Antennas

The distance between the base station’s receive and
transmit antennas is not adjustable when the anten­nas are connected directly on the back of the unit.

Figure 12

Proper Dressing of the Antennas

-8-

Keep the distance between the BTR and the TR as
short as possible. The greater the distance, the
weaker the signal. Make sure the “signal paths” be­tween the BTR and TR are unobstructed. You
should be able to visibly locate the antennas at all
times for best performance.

elex

T

elex

T

Attempting to operate the wireless intercom system
through or around walls, ceilings, metal objects, etc.
will reduce system range and performance.

700 FEET

100 FEET

I/C

I/C

AUDIO

AUDIO

IN

IN
OUT

OUT

TELEX

TELEX

OUT

OUT
IN

IN

CHANNEL

CHANNEL

R

R

RadioCom

RadioCom

1

1

AUTO
ON

ON

OFF

OFF

AUTO

I/C

I/C

B

P

B

P

2

2

OUT

OUT
IN

IN

E

E

A

A
L

L

C

C

OFF

OFF

T

T

K

K

AUX

AUX

BELTPACK

BELTPACK
LOCAL

LOCAL

BTR-600C

BTR-600C

SIDETONE

SIDETONE

MIC

MIC

GAIN

GAIN

A1B

A1B

2

2

AUX

AUX

VOL

VOL

TALK/

TALK/
OM

OM

ON

ON

CODESWITCH

CODESWITCH

TALK

TALK

Figure 13

Distance Between base station and

beltpack

elex

T

R

RadioCom

RadioCom

ON

ON

I/C

I/C

B

P

B

P

OUT

OUT
IN

IN

E

A

E

A
L

L

C

C
T

T

K

K

AUX

AUX

BELTPACK

BELTPACK
LOCAL

LOCAL

OFF

OFF

BTR-600C

BTR-600C

SIDETONE

SIDETONE

HEADSET

HEADSET

MIC

MIC
1

1

GAIN

GAIN
AUTO

AUTO

A1B

A1B

2

2

AUX

AUX

2

2

VOL

VOL

TALK/

TALK/

OM

OM

ON

ON
OFF

OFF

CODESWITCH

CODESWITCH

TALK

TALK

elex

T

HEADSET

HEADSET

I/C

I/C

AUDIO

AUDIO

IN

IN
OUT

OUT

TELEX

TELEX

OUT

OUT
IN

IN

CHANNEL

CHANNEL

R

Figure 15

Operating System Near Obstructions

DO NOT - mount the base station 1/2-wave anten-

nas on, or next to metal, such as beams, walls with
metal studs, equipment racks, etc. This also applies
to the antennas when assembled directly to the Base
Station. This will “detune” the antennas which can
result in noise or loss of RF signal at the Base Sta­tion, See Figure 15.

HEADSET

A1B

A1B

HEADSET

MIC

MIC

GAIN

GAIN

2

2

VOL

VOL

TALK/

TALK/
OM

OM

CODESWITCH

CODESWITCH

TALK

TALK

RadioCom

ON

ON

OFF

OFF

BTR-600C

BTR-600C

elex

T

1

1
AUTO

AUTO
I/C

I/C

AUX

AUX

B

P

B

P

OUT

2

OUT

2
IN

IN

E

A

E

A
L

L

C

C

ON

ON
OFF

OFF

T

T

K

K

AUX

AUX

BELTPACK

BELTPACK
LOCAL

LOCAL

SIDETONE

SIDETONE

I/C

I/C

AUDIO

AUDIO

IN

IN

TELEX

TELEX

OUT

OUT

OUT

OUT

IN

IN

CHANNEL

CHANNEL

R

R

RadioCom

Figure 14

Keeping Site Clear to Antenna

-9-

Telex

elex

T

2. Placing the BTR on top of a
shelf or equipment rack un­obstructed without remoting
the antennas is OK.

1. Placing BTRs in a shelf or
equipment rack and using re­mote antennas is OK.

elex

T

A1B2

TALK

T

elex

3. Placing BTRs in a shelf or
equipment rack with the an­tennas mounted on the back
of the BTR or the side of the
rack is bad.

elex

T

A

1B2

TALK

A

1B2

TALK

A1B2

TALK

A

1B2

TALK

R

SC-600

UHFANTENNASPLITTER/COMBINER

elex

T

A

A

A1B2

A

1B2

TALK

1B2

TALK

TALK

1B2

TALK

#1

Figure 16

Antenna Placement

Improving Reception and Increasing Range

Keeping the distance from the base station and
beltpack as short, and unobstructed as possible will
produce the most reliable performance.

The base station is supplied with two antennas. This
should provide satisfactory system performance in
most applications. System range can be enhanced
by remoting the 1/2-wave antennas.

#2

A

1B2

TALK

A

1B2

TALK

A1B2

TALK

A

1B2

TALK

R

SC-600

UHFANTENNASPLITTER/COMBINER

elex

T

A

A

A1B2

A

1B2

TALK

1B2

TALK

TALK

1B2

TALK

#3

If a multiple base station system is being config­ured, it is best to use a splitter/combiner (SC-600)
with remote antennas for the best performance.

-10-

Base Station Set-Up

Location

Locate the base station on a level surface with the
rear of the unit facing you. See “Antenna Informa­tion” section for more information on choosing a lo­cation.

Rack Mounting

Two kits are available for rack mounting the base
station. The first kit rack mounts a single base sta­tion in a 19" rack. The second kit rack mounts two
base stations, side by side, in a 19" rack. Instruc­tions are included in the rack mount kits. Refer to
the “Accessories” section for rack mount part num­bers.

Figure 18

Connecting Headset to the Base Station

Figure 17

Attaching Brackets for Rack Mounting

Local Headset Connection

Insert the headset into the 4 pin XLR connector on
the front panel. See the headset connection diagram
(Figure 2) if other than a Telex Headset is used.

RF Transmit/Receive Channel Switches

Allows the user to select which of the two RF chan­nels the unit is on. The transmit channel selected,
either “A” or “B”, is the frequency of the base sta­tion’s transmitter.

The receiver channel selected, either “A” or “B”, is
the frequency of the base station’s receiver. The fre­quencies are listed on the bottom of the base station.

The base station’s transmit frequency must match
the beltpack’s receive frequency. The base station’s
receiver must match the beltpack’s transmit fre­quency. Typically both base station switches are set
to “A” or both to “B” and the beltpacks are set to
the same.

A
B

RECEIVE

CHANNEL

A
B

TRANSMIT

CHANNEL

-11-

Figure 19

Receive and Transmit Switches

RF Transmit Mode Switch

Dual Listen Switches

Allows the operator to select three different types of
transmitting modes; continuous transmit, transmitter
off, or remote transmitter. For most operations,
place the transmitter switch in the “CONT” position
(Continuous mode).

In the Continuous mode the RF transmitter will be
on at all times regardless of whether the portables
are on or not.

In the Remote mode, the only time the base can
transmit is when a portable unit is turned on.

In the Off mode the base station will not transmit to
the remote belt-packs. This mode might be used if
the base is to be an intercom system monitor station
only.

XMIT

MODE

REMOTE

These two switches allow the mixing of the inter­com channels. The mixing of audio channels occurs
locally, only at the base station and its beltpack. The
switches do not affect the audio in the intercom
lines into the base station.

DUAL

LISTEN

CH1 + 2

O
N

CH2 + 1

LEVEL

Figure 22

Dual Listen Switches

CH1 + 2 Switch = OFF
CH2 + 1 Switch = OFF

O

F
F

CONT.

Figure 20

Transmit Switch

Intercom Type Switch

Set for Telex or RTS Type intercom systems.

I/C

TELEX

Figure 21

Intercom Select Switch

RTS

The two intercom audios are isolated. Audio chan­nel one cannot be heard on channel two and vise
versa.

CH1 + 2 Switch = ON

CH2 + 1 Switch = OFF

Audio channel two will be mixed into audio channel
one. The volume of the mix of channel two as heard
in audio channel one may be controlled by the level
control.

CH1 + 2 Switch = OFF

CH2 + 1 Switch = ON

Audio channel one will be mixed into audio channel
two. The volume of the mix of channel one as heard
in audio channel two may be controlled by the level
control.

CH1 + 2 Switch = ON
CH2 + 1 Switch = ON

Both audio channels are mixed into one another.
The level of the other channel may be heard at the
volume set by the level control.

-12-

Audio Channel Switch

Intercom Type Set to Telex

Selects either “IC 1 or 2" (and corresponding pins
on ”IC Loop-thru"). In “Auto” position the switch
allows selection of channels 1 or 2 from the
beltpack.

AUDIO

CHANNEL

1
AUTO
2

Figure 23

Audio Channel Switch

Intercom Type Set to RTS

Selects RTS channel 1 or 2 on both I/C jacks (and
corresponding Pins on “I/C Loop-thru”). In “Auto”
position the switch allows selection of channels 1 or
2 from the beltpack.

Telex IN/OUT Switch

Intercom Type Set to Telex

Telex = OUT

Intercom is disconnected from the I/C jacks and
corresponding “I/C Loop-thru” connector pins.

Telex = IN

Intercom is connected to I/C jacks and correspond­ing “I/C Loop-thru" connector pins.

AUX

OFF

ON

Figure 25

Auxiliary Switch

Auxiliary to I/C Switch (Program Audio)

This switch is located inside the base station. Its
function is to provide a user with the ability to input
a third channel of listen only audio via the “AUX”
jack. This third channel of audio, usually called
“Program Audio” is always heard regardless of
which intercom channel the user is on. The program
audio is heard only on the local base station and its
beltpack.

To gain access to the switch the base station’s top
cover must be taken off. Unscrew the six screws on
the cover and lift off. The switch can be found be­tween the two shielded compartments (Figure 27).
The switch is labeled “Aux to IC” and should nor­mally be left in the “ON” position. Unless using the
“AUX” jack for program audio input. Switch to the
“OFF” position if inputing program audio. The
switch now disables auxilary input audio from be­ing placed on the intercom system but can be heard
locally.

Intercom Type Set to RTS

Setting of switch has no effect. All I/C jacks and
corresponding “I/C Loop-thru” connector pins are
active.

I/C

TELEX

OUT

IN

Figure 24

Telex In/Out Switch

Auxiliary Switch

Turns the “AUX” jack input audio on or off.
The audio out is always sent to the “Aux” jack and
is unaffected by the switch position.

The auxiliary ON/OFF switch must be set to “ON”
to enable input audio through the auxiliary port. The
level of the program audio as heard in the back­ground of the audio channel currently switch to is
controlled via the “AUX IN" level control on the
front panel.

Code Switch (BTR-600C Only)

Allows the operator to select over 65,000 cipher
codes. The beltpack’s code must match the base sta­tion’s code for audio recovery. Any combination of
letters and/or numbers may be selected except 0000.
The data is unencrypted when the setting is 0000.

A

F2

Figure 26

Code Switch

-13-

3

ON

ON

S6

AUX T O IC

OFF

S6

AU X T O IC

OF F

Figure 27

Auxiliary to I/C Switch

TRANSMIT

ANT.

TELEX RTS

A
B

TRANSMIT
CHANNEL

PUSH

AUDIO
OUT

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

CH2+2

O

O

F

N

F

I/C 1

CH2+1

LEVEL

CONT.

BTR-500

LOOP
THRU

1

1

6

6

9

9

5

5

I/C

RECEIVE

FCCID. B5DM503

PUSH

MADEIN U.S.A.
PATENTPENDING

I/C2

ANT.

A

POWER

B

12-15V

RECEIVE

AUX

AC/DC

CHANNEL

INTERCONNECT

CABLE

(SUPPLIED)

TRANSMIT

ANT.

TELEX RTS

A
B

TRANSMIT
CHANNEL

PUSH

AUDIO
OUT

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

CH2+2

O

O

F

N

F

I/C 1

CH2+1

LEVEL

CONT.

BTR-500

LOOP
THRU

1

1

6

6

9

9

5

5

I/C

RECEIVE

FCCID. B5DM503

PUSH

MADEIN U.S.A.
PATENTPENDING

I/C2

ANT.

A

POWER

B

12-15V

RECEIVE

AUX

AC/DC

CHANNEL

TRANSMIT

ANT.

TELEX RTS

A
B

TRANSMIT
CHANNEL

PUSH

AUDIO
OUT

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

CH2+2

O

O

F

N

F

I/C 1

CH2+1

LEVEL

CONT.

BTR-500

LOOP
THRU

1

1

6

6

9

9

5

5

I/C

RECEIVE

FCCID. B5DM503

PUSH

I/C2

MADEIN U.S.A.
PATENTPENDING

AUX

ANT.

A

POWER

B

12-15V

RECEIVE

AC/DC

CHANNEL

XLR INTERCOM

CABLE

ONLY ONE CABLE
NEEDED FOR RTS.

BOTH ARE REQUIRED
FOR 2 CHANNELS OF

TRANSMIT

AUDIO

ANT.

OUT

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

CH2+2

TELEX RTS

O

A

F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

LOOP
THRU

PUSH

1

6

6

9

9

5

O
N

I/C 1

I/C

LEVEL

AUDIOCOM (TELEX)

BTR-500

1

5

RECEIVE

FCCID. B5DM503

PUSH

MADEIN U.S.A.
PATENTPENDING

POWER
12-15V

I/C2

RECEIVE

AUX

AC/DC

CHANNEL

ANT.

A
B

Figure 28

Connecting Base Stations Together

Interconnection to a Hard-Wired Intercom
System

The Radiocom wireless system can be integrated
into Audiocom (Telex) intercom systems and most
existing wired intercom systems including RTS and
Clear-Com.

Connect the intercom cable to the back of the base
station. The intercom system may be connected to
the base station via the XLR, D-Sub, or Aux con­nector in the rear of the unit. Audiocom, RTS and
Clear-Com intercom systems use either the XLR or
D-Sub connector. RTS Matrix intercom systems
typically use the Aux connector. Example configu­rations of the two most popular intercom systems
are shown in Figures 29 and 30.

NOTE: It is not recommended to interface an inter­com system thru the “Aux” jack while at the same
time having a different intercom system connected
to the XLR or D-Subs.

It is recommended that Clear-Com intercom sys­tems be interfaced to the base station through the
use of CCB-1 Adapters. These adapters convert
Clear-Com intercom signals to Telex intercom sig­nals and vise versa. See “Accessories” for more in­formation.

-14-

INTERCOM

POWER SUPPLY

(PS-2000L)

100-240VAC 60/50HZ

TELEX

R

CHN1

CHN2

CLASS2 WIRING1.5A24 VDC

MADEIN USA

INTERCOM USER STATION

(US-2000A)

HEADSET

TWO CH BELTPACK

(BP-2000)

AUDIO CH 1

TRANSMIT

AUDIO

ANT.

OUT

DUAL

XMIT

LISTEN

MODE

/C

I

REMOTE

CH2+2

TELEX RTS

O

A

O

F

N

F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

BTR-600

LOOP
THRU

PUSH

1

6

6

9

9

5

I/C1

I/C

LEVEL

RECEIVE

BTR-500

FCCID. B5DM503

PUSH

1

5

ANT.

MADEIN U.S.A.
PATENTPENDING

A
B

POWER
12-15V

I/C2

RECEIVE

AUX

AC/DC

CHANNEL

PROGRAM

INPUTS

P.A.

EXP
OUT

12-15VDC

AUDIO CH 1

SPEAKERS

1

2

LINELEVEL

1VRMS

"Y"

TELEXCOMMUNICATIONS, INC.MADE INUSA

VOL
PGM1

CHN1

CABLE

PUSH

VOL

PGM2

PUSH

CHN2

AUDIO CH 2

ONE CH BELTPACK

(BP-1000)

LINES

LINES

TWO CH BELTPACK

LINES

HEADSET

(BP-2000)

LINES

HEADSET

HEADSET

ONE CH BELTPACK

AUDIO CH 2

TRANSMIT

PUSH

AUDIO

ANT.

OUT

DUAL

XMIT

LISTEN

MODE

/C

I

REMOTE

CH2+2

TELEX RTS

O

A

O

F

N

F

B

I/C1

TRANSMIT

CH2+1

LEVEL

CONT.

CHANNEL

BTR-600

(BP-1000)

RECEIVE

BTR-500

LOOP
THRU

FCCID. B5DM503

PUSH

1

1

6

6

9

9

5

5

I/C2

I/C

MADEIN U.S.A.
PATENTPENDING

ANT.

A
B

POWER
12-15V

RECEIVE

AUX

AC/DC

CHANNEL

TRANSMIT

AUDIO

ANT.

OUT

DUAL

XMIT

LISTEN

MODE

/C

I

REMOTE

CH2+2

TELEX RTS

O

A

O

F

N

F

B

TRANSMIT

CH2+1

LEVEL

CONT.

CHANNEL

BTR-600

PUSH

I/C1

ONE CH BELTPACK

(BP-1000)

RECEIVE

BTR-500

LOOP
THRU

FCCID. B5DM503

PUSH

MADEIN U.S.A.
PATENTPENDING

ANT.

A
B

POWER

12-15V

RECEIVE

AUX

AC/DC

CHANNEL

1

1

6

6

9

9

5

5

I/C2

I/C

TRANSMIT

AUDIO

ANT.

OUT

XMIT

MODE

/C

I

REMOTE

CH2+2

TELEX RTS

O

A

F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

BTR-600

LINES

HEADSET

RECEIVE

BTR-500

LOOP
THRU

PUSH

DUAL
LISTEN

O
N

I/C1

LEVEL

FCCID. B5DM503

PUSH

1

1

6

6

9

9

5

5

I/C

ANT.

MADEIN U.S.A.
PATENTPENDING

A
B

POWER
12-15V

I/C2

RECEIVE

AUX

AC/DC

CHANNEL

INTERCONNECT CABLES

T

T

T

elex

elex

elex

Figure 29

Example Interface to an Audiocom (Telex) Intercom System

-15-

T

elex

AUDIO CH 1 AND 2

RTS

DISTRIBUTION PANEL

(TW5W)

LINE

HEADSET

ONE CH BELTPACK

(BP-318)

NORM

200

MODELPS15
POWERSUPPLY
O/N9000678600

IMPEDANCE

SELECT

INTERCOM

POWER SUPPLY

OUTPUTS

J1 J2

DUAL
400

CHN1CHN1

(PS15)

J1,J2 CONNECTTO
TWINTERCOM SYSTEMCOMPONENTS
REFERTO OPERATIONMANUAL

J3

AUDIO

COUPLING

CM1-CM2

RTSSYSTEMS, BURBANKCALIFORNIA MADEIN U.S.A.

FUSE

0.5AS8/120 VAC

TIP-CH1
RING-CH2
SLEEVE-COM

CAUTION

FORCONTINUED PROTECTIONAGAINST FIRE
REPLACEONLY WITHSAME TYPEFUSE.

AUDIO CH 1 AND 2

TWO CH BELTPACK

(BP-350)

LINE

HEADSET

TWO CH BELTPACK

(BP-350)

LINE

HEADSET

TRANSMIT

ANT.

XMIT
MODE

/C

I

REMOTE

TELEX RTS

O

A

F
F

B

TRANSMIT

CONT.

CHANNEL

LOOP
THRU

PUSH

AUDIO

1

1

6

OUT

CH2+2

CH2+1

6

DUAL
LISTEN

9

9

5

O
N

5

I/C1

I/C

LEVEL

RECEIVE

BTR-500

FCCID. B5DM503

PUSH

I/C2

MADEIN U.S.A.
PATENTPENDING

ANT.

A
B

POWER

12-15V

RECEIVE

AUX

AC/DC

CHANNEL

BTR-500

BTR-500

TRANSMIT

ANT.

XMIT

MODE

/C

I

REMOTE

TELEX RTS

O

A

F
F

B

TRANSMIT

CONT.

CHANNEL

TRANSMIT

ANT.

XMIT
MODE

/C

I

REMOTE

TELEX RTS

O

A

F
F

B

TRANSMIT

CONT.

CHANNEL

LOOP
THRU

PUSH

AUDIO

1

1

6

OUT

CH2+2

CH2+1

AUDIO
OUT

CH2+2

CH2+1

6

DUAL

LISTEN

9

9

5

O
N

DUAL
LISTEN

O
N

LEVEL

5

I/C1

I/C

LEVEL

LOOP
THRU

PUSH

1

1

6

6

9

9

5

5

I/C1

I/C

RECEIVE

BTR-500

FCCID. B5DM503

PUSH

I/C2

BTR-500

PUSH

I/C2

MADEIN U.S.A.
PATENTPENDING

FCCID. B5DM503
MADEIN U.S.A.
PATENTPENDING

ANT.

A
B

POWER
12-15V

RECEIVE

AUX

AC/DC

CHANNEL

RECEIVE

ANT.

A
B

POWER
12-15V

RECEIVE

AUX

AC/DC

CHANNEL

BTR-500

LINE

HEADSET

TWO CH BELTPACK

(BP-350)

T

elex

Example Interface to an RTS Intercom System

TWO CH BELTPACK

(BP-350)

TRANSMIT

ANT.

XMIT
MODE

/C

I

REMOTE

TELEX RTS

O

A

F
F

B

TRANSMIT

CONT.

CHANNEL

LOOP
THRU

PUSH

AUDIO

1

1

6

OUT

CH2+2

CH2+1

6

DUAL
LISTEN

9

9

5

O

5

N

I/C1

I/C

LEVEL

RECEIVE

BTR-500

FCCID. B5DM503

PUSH

I/C2

MADEIN U.S.A.
PATENTPENDING

ANT.

A
B

POWER
12-15V

RECEIVE

AUX

AC/DC

CHANNEL

BTR-500

LINE

HEADSET

T

elex

T

elex

T

elex

Figure 30

-16-

Auxiliary Audio Connection

Dummy Load

The 6 pin telephone jack (RJ-11) may be used to
supply audio into and out of the base station. RTS
Matrix type intercoms may be interfaced to the base
station through this jack.

Since audio is not “Channelized” through this jack,
the audio channel switch has no effect on the audio
passed through the jack. The audio will be heard on
both channels 1 and 2 equally, audio generated by
the BTR on channels 1 or 2 will be sent to the Aux­iliary Jack.

PIN654321

NC

AUDIO IN -

AUDIO OUT -

NC

AUDIO IN +

AUDIO OUT +

Figure 31

Auxiliary Jack

In the case where a wired intercom will not be used
with the base station or only one of the audio chan­nels are connected to the unit, it is important that
the dummy load(s) (supplied) be installed.

I/C Switch = Set for Telex

Telex dummy loads should be plugged into both
XLR ports if a wired Telex intercom system is not
being used. A single Telex dummy load should be
plugged into the unused channel’s XLR port if only
one channel is connected to an intercom system.

I/C Switch = Set for RTS

RTS dummy load should be plugged into one of the
XLR ports if an RTS intercom system is not being
used.

NOTE: If the dummy load is not placed properly,
an annoying squeal may result that may cause dam­age to the ears.

Power Connection

Insure the Power ON/OFF Switch on the front of
the base station is in the “OFF” position. Connect
the supplied AC power supply cord to the receiver
at the socket labeled “POWER”. Connect the power
supply unit to an AC outlet supplying 105 to 125
VAC, 60 Hz.

POWER

12-15V
AC/DC

TO
AC
OUTLET

Figure 32

Connecting the Power Supply

-17-

Beltpack Set-Up

Headset Connection

Insert the headset/microphone into the connector on
the bottom on the unit. See the headset connection
diagram (Figure 8) if a unit other than Telex headset
is used.

A

F2

A

TRANSMITCHANNEL

B
A

RECEIVE CHANNEL

B

PUSHTO

TALK

PUSHTO

TRANSMIT

SERIALNo.

3

Figure 34

RF Channel Switches and RF Transmit Mode

Switch

RF Transmit Mode Switch

Allows the operator to select two different types of
transmitting modes; Push-to-talk or
Push-to-transmit. For most operations, place the
transmitter switch in the “Push-to-talk" mode.

Figure 33

Connecting Headset

RF Transmit/Receive Channel Switches

Allows the user to select which of the two RF chan­nels the unit is on. The transmit channel selected,
either “A” or “B”, is the frequency of the beltpack’s
transmitter.

The receiver channel selected, either “A” or “B”, is
the frequency the beltpack’s receiver is at. The fre­quencies are listed on the label which is located un­der the beltpack’s battery pack.

The base station’s transmit frequency must
match the beltpack’s receive frequency. Also the
base station’s receiver must match the beltpack’s
transmit frequency. Typically the base station
switches are both set to “A” or both to “B” and
the beltpacks are set to match.

In the “Push-to-talk” mode the RF transmitter will
be on at all times regardless of whether the talk
switch is on or off.

In the “Push-to-transmit” mode, the transmitter will
be on only when the talk button is activated. The
transmitter will be turned off when the talk button is
deactivated.

Code Switch (TR-600C Only)

Allows the operator to select over 65,000 cipher
codes. The beltpack’s code must match the base sta­tion’s code for audio recovery. Any combination of
letters and/or numbers may be selected except 0000.
The data is unencrypted when the setting is 0000.

A

F2

3

-18-

Figure 35

Code Switch

Battery Installation

Insure that the OFF/ON volume control knob is
turned OFF. Press down the battery release latch
and remove battery pack. Pack slides off in opposite
direction. Replace batteries as follows:

1. Open the battery pack by inserting finger
nail and lifting as shown.

2. Pull battery strap to remove low or
dead batteries.

3. Load new batteries with negative end against the spring.

4. Start loading at hinged end of case.

5. Be sure strap goes under batteries and over the top of the ribs.

6. Tuck end of strap under door when closing.

Figure 36

Battery Installation

-19-

Pre-Walk-Thru Checklist

Following the instructions fully to this point you
have successfully completed the following check­list:

Located the base station properly.

❒

Connected power to base station transceiver.

❒

Set audio channel correctly.

❒

Set Telex switch properly.

❒

Set Code Switch to a unique code that

❒

matches the beltpack. (BTR-600C only)

Connected the 1/2-wave antennas to the base

❒

station. Check frequency range of the antenna
with the frequency of the base station by cor­rectly matching color codes.

For a large system in which a split-

❒

ter/combiner (SC-600) is used, make sure the
antenna cables are connected to the correct
ports and that the main antennas are con­nected to the marked SC-600 ports.

Set RF transmit and receive switches on the

❒

base stations(s) to match their respective
beltpacks.

Set transmit mode switch on base station.

❒

Connected headsets to base stations (if

❒

needed) and all beltpacks.

Connected the base station to any auxiliary

❒

audio, intercom, or external speaker if
needed.

Installed batteries in the beltpack.

❒

If you missed any of the above instructions,

❒

go back and complete that instruction before
going on.

Set wired intercom type correctly.

❒

-20-

System Operation

Base Station Operation

Power

If you have followed the instructions until this point
you should now be ready to turn both the beltpack
and the base station “ON”

Place the power switch on the base station in the
“ON” position. The green power on indicator LED
should illuminate.

Figure 37

Base Station Power Switch

Push-to-Talk/Lock-to-Talk Switch

LOCAL

HEADSET VOLUME

TALK/ OVERMODULATION

INDICA TOR

HEADSET

MIC

GAIN

VOL

TALK/

OM

TALK

PUSH TO TALK
LOCK TO TALK

Figure 38

Push-to-Talk/Lock-to-Talk Switch and Local

Headset Volume

Microphone Gain

The microphone gain of the local headset may need
to be adjusted for various audio conditions. The
talk/overmodulation (OM) LED should be green if
the local headset microphone has been activated.
This LED will turn red when Mic Gain is too high
and will need to be turned down. If the LED does
not flash red at all and the audio is low, the gain
may need to be turned up. The gain should be ad­justed so the LED flashes red only on loudest
speech.

To enable the talk function on the base station press
and hold down on the talk button and begin talking.
Releasing the talk button will discontinue the mi­crophone audio. For continuous talk, quickly press
and release the talk button. This enables the talk
function as long as you want. To release the talk
function press and release the talk button once more
and the talk function will cease.

NOTE: The talk LED will be illuminated wherever
the talk function is activated.

Local Headset Volume

Adjust the volume control on the base station by ro­tating the Volume control either clockwise or coun­terclockwise as required for comfortable listening
volume.

Using the plastic screwdriver (supplied), adjust the
control appropriately. Note that the volume heard
can also be adjusted by changing the spacing be­tween the microphone and your mouth.

TALK/

OVERMODULATION

INDICATOR

VOL

TALK/

TALK

MIC

GAIN

OM

MICROPHONE

MICROPHONE

GAIN

GAIN

HEADSET

INCREASE

GAIN

DECREASE

GAIN

Figure 39

Adjusting Microphone Gain

-21-

Dual Listen Level

This control is related to the dual listen switches. It
controls the level of the audio mix. For more infor­mation on the dual listen switches, refer to the
“Base Station Set-Up” section.

TRANSMIT

LEVEL

PUSH

I/C 1

ANT.

A
B

TRANSMIT
CHANNEL

TELEX

AUDIO
OUT

DUAL

XMIT

LISTEN

MODE

/C

I

REMOTE

RTS

CH1 + 2

O
F
F

CONT.

CH2 + 1

O
N

Figure 40

Dual Listen Level Control

Intercom Level

I/C IN

Adjusts the level of the Intercom system’s audio
into the base station. The Intercom “IN” control
should be adjusted so the intercom LED flashes red
on loudest speech over the intercom system.

Aux OUT

Adjusts the level of the base station’s audio out to
the auxiliary connector. The auxiliary “OUT” con­trol should be adjusted so that its audio is equal to
other devices on the auxiliary system. The base sta­tion’s audio is always supplied to the auxiliary jack
regardless of the auxiliary switch position.

INTERCOM

AUXILIARY

LEVEL

CONTROLS

LEVEL

CONTROL

LOCAL

SIDETONE

OUT

IN

I/C

OUT

IN

AUX

BELTPACK

AUDIO

CHANNEL

1
AUTO
2

INTERCOM

LED

I/C

IN

OUT

TELEX

AUX

ON

OFF

AUXILIARY LEVEL

LED

AUXILIARY

ON/OFF

Figure 41

Intercom Level Controls, AuxiliaryLevel

Controls, and Sidetone Level Controls

I/C OUT

Adjusts the level of the base station’s audio out to
the intercom system. The intercom “OUT” control
should be adjusted so that its audio on the intercom
system is equal in level to the other intercom de­vices on the intercom system. A way to adjust this
level is to have someone talk into the base station
with a local headset while someone else listens to
the audio over the intercom system via another in­tercom device.

Auxiliary Level

These controls should be placed fully coun­ter-clockwise unless the Aux Jack is being used.
Noise can be added to the system if these controls
are turned up without a connection to the Aux. Jack.

Aux IN

Adjusts the level of the auxiliary input audio to the
base station. The auxiliary “IN” control should be
adjusted so that the LED flashes red on loudest
speech. The Aux. switch controls whether the base
station’s auxiliary input audio is ”ON" or “OFF”.

Sidetone Level

Local Sidetone

This control adjusts the voice feedback to the ear­phone of a headset plugged into the base station.

Beltpack Sidetone

The beltpack control adjusts the voice feedback to
the earphone of the beltpack’s headset.

NOTE: “Mirror Image” beltpacks have the ability
to communicate beltpack to beltpack direct. The
belpack sidetone on this version is controlled by a
level control on the beltpack, see Figure 51. If a
base station is used with one of these special
beltpacks, then its beltpack sidetone control would
have no effect on the beltpack.

-22-

Beltpack Operation

Power/Local Headset Volume

You should now be ready to turn the beltpack
“ON”. Rotate the OFF/ON Volume Control Switch
on the beltpack clockwise to turn the unit on.

ON/OFF SWITCH AND VOLUME CONTROL

BAT/ TALK

O

O.M.

F
F

ON

VOLUME

TALK

Figure 42

Off/On Volume Control Switch

1

CHANNEL

AUDIO

2

Push-to-Talk/Lock-to-Talk

To enable the talk function on the beltpack press
and hold down on the talk button and begin talking.
Releasing the talk button will discontinue the mi­crophone audio. For continuous talk, quickly press
and release the talk button. This locks on the talk
function. To release the talk function press and re­lease the talk button once.

NOTE: The talk LED will be illuminated whenever
the talk function is activated.

ON

VOLUME

O
F
F

BAT/ TALK
O.M.

TALK

1

CHANNEL

AUDIO

2

Battery Check

As you rotate the OFF/ON volume control knob
clockwise to turn the unit on, note that the battery
LED (Labeled “BAT/O.M.”) should flash one time
on good batteries. Poor batteries will cause the LED
to be illuminated continuously and a bad or unus­able battery will not cause any illumination at all.

LOW BATTERY AND OVERMODULATION

INDICATOR LED

ON

VOLUME

O
F
F

BAT/ TALK
O.M.

TALK

1

CHANNEL

AUDIO

2

PUSH-TO-TALK / LOCK-TO-TALK SWITCH

Figure 44

Push-to-Talk/Lock-to-Talk Switch

Microphone Gain

The microphone gain of the beltpack’s headset may
need to be adjusted for various audio conditions.
The Battery/Overmodulation (O.M.) LED will flash
red when Mic Gain is too high and will need to be
turned down. If the LED does not flash red at all,
and the audio from the unit sounds low, then the
gain may need to be turned up. The gain should be
adjusted so the LED flashes red only on loudest
speech.

Using the plastic screwdriver (supplied), adjust the
control appropriately. Note that the volume heard
can also be adjusted by changing the spacing be­tween the microphone and your mouth.

Figure 43

Low Battery and Overmodulation Indicator

LED

-23-

BATTERY/

OVERMODULATION

INDICATOR

VOLUME

TALK

T

e

O.M.

BAT/

l

F
F

e

ON

O

x

AUDIO

1

CHANNEL

2

Figure 45

Microphone Gain

MICROPHONE

GAIN

N

I

A

G

C

I

M

INCREASE

GAIN

DECREASE

GAIN

Specially ordered beltpack to beltpack (Mirror Im
age) direct communication units have their sidetone
controlled by a control on the beltpack. To adjust
the voice feedback to the earphone (sidetone) of
these units, simply turn the control until the
sidetone is at a comfortable level.

SIDETONE

LEVEL

CONTROL

VOLUME

TALK

e

T

O.M.

BAT/

e

l

F
F

O

x

ON

N

I

A

G

C

I

M

AUDIO

1

CHANNEL

2

INCREASE

GAIN

DECREASE

GAIN

-

Sidetone Level

Regular TR beltpacks have their sidetone control lo­cated on their respective base stations (See the
sidetone level part of the base station “Operation
Section”).

Figure 46

Sidetone Level Control

-24-

Example System Configurations

Single Base Station Audiocom (Telex) System

The audio out RCA jack on the back of this unit is
used for the public address system. The unused
Audiocom channel must be terminated to avoid
loud feedback if audio channel two was switched to
by the beltpack.

AUDIO CHANNEL 1 = RANGE INSTRUCTIONS
AUDIO CHANNEL 2 = NOT USED

The audio out of the base station’s RCA jack is the
audio channel currently switched to at the BTR-500.

TARGET

AREA

LOUD

SPEAKER

SHOOTING

AREA

LOUD

SPEAKER

1CH 1CH 1CH 1CH

SHOOTER'S WIRED BELTPACKS

elex

T

RANGE
DIRECTOR

BTR-500

PA SYSTEM

1CH 1CH

AUDIOCOM

POWER SUPPLY

TRANSMIT

AUDIO

ANT.

OUT

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

CH2+2

TELEX RTS

O

A

O
F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

BTR-500

LOOP
THRU

PUSH

N

I/C1

LEVEL

FCCID. B5DM503

PUSH

1

1

MADEIN U.S.A.

6

6

PATENTPENDING

9

9

5

5

I/C2

I/C

AUX

TELEX

RECEIVE

ANT.

A

POWER

B

12-15V

RECEIVE

AC/DC

CHANNEL

LOAD

Figure 47

Example single BTR-500 Audiocom System used at a Shooting Range

-25-

Single Base Station RTS System

AUDIO CHANNEL1=STAGEANDDIRECTION
AUDIO CHANNEL 2 = AUDIO EFFECTS/LIGHTING/CURTAIN

1CH
B.P.

SPOTLIGHT

2 = AUDIO EFFECTS/

LIGHTING/CURTAIN

WIRED

BELTPACKS

1CH
B.P.

CURTAIN

2 = AUDIO EFFECTS/
LIGHTING/ CURTAIN

1CH
B.P.

AUDIO

EFFECTS

2 = AUDIO EFFECTS/

LIGHTING/CURTAIN

DIRECTOR

1 = STAGE/DIRECTION
2 = AUDIO EFFECTS/

LIGHTING/CURTAIN

1CH
B.P.

STAGE

LIGHTS

2 = AUDIO EFFECTS/

LIGHTING/CURTAIN

RTS

POWER SUPPLY

2CH
B.P.

RTS

DISTRIBUTION PANEL

TRANSMIT

ANT.

/C

I

T

elex

BACKSTAGE

TELEX RTS

A
B

TRANSMIT
CHANNEL

PUSH

AUDIO
OUT

DUAL

XMIT

LISTEN

MODE

REMOTE

CH2+2

O

O

F

N

F

I/C 1

CH2+1

LEVEL

CONT.

BTR-500

LOOP
THRU

PUSH

1

1

6

6

9

9

5

5

I/C 2

I/C

MANAGER

1 = STAGE/DIRECTION
2 = AUDIO EFFECTS/LIGHTING/CURTAIN

Figure 48

Example Single BTR-500 RTS System used at a Small Play Production

-26-

FCCID. B5DM503
MADEIN U.S.A.
PATENTPENDING

AUX

RECEIVE

ANT.

A

POWER

B

12-15V

RECEIVE

AC/DC

CHANNEL

Six Base Station RTS System

FIXED STATIONS

2CH

B.P.

DIRECTOR

2CH

B.P.

TECH

DIRECTOR

2CH

B.P.

AUDIO

MIXER

TRANSMIT

ANTENNA

RECEIVE

ANTENNA

BTR-500s

ex

T

el

ALP-450

THISEND TOWARDTRANSMITTER

ex

T

el

ALP-450

THISEND TOWARDTRANSMITTER

R

R

FIXED STATIONS

2CH

B.P.

VIDEO

OPERATOR

2CH

B.P.

TAPE

OPERATOR

AUDIO CHANNEL 1 = MAIN PRODUCTION
AUDIO CHANNEL 2 = PRIVATE LINE

A

ANT.

A

ANT.

A

ANT.

A

SC600

LOOP
THRU

PUSH

1

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

A

O

F

N

F

B

TRANSMIT
CHANNEL

A
B

TRANSMIT
CHANNEL

TRANSMIT
CHANNEL

1/C

CH2+1

LEVEL

CONT.

LOOP
THRU

PUSH

1

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

O

F

N

F

1/C

CH2+1

LEVEL

CONT.

PUSH

1

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

A

O

F

N

F

B

1/C

CH2+1

LEVEL

CONT.

B

PUSH

AUX

B

PUSH

AUX

B

PUSH

AUX

RTS

DISTRIBUTION PANEL

RTS

POWER SUPPLY

DC

TRANSMIT
TRANSMIT
ANTENNA

OUTPUT

A

LOOP
THRU

PUSH

ANT.

1

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

A

O

F

N

F

B

TRANSMIT
CHANNEL

1/C

CH2+1

LEVEL

CONT.

B

PUSH

AUX

A

LOOP
THRU

PUSH

ANT.

1

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

A

O

F

N

F

B

TRANSMIT
CHANNEL

1/C

CH2+1

LEVEL

CONT.

B

PUSH

AUX

A

PUSH

ANT.

XMIT
MODE

I

/C

REMOTE

TELEX RTS

O

A

F
F

B

TRANSMIT

CONT.

CHANNEL

PUSH

1

1

6

6

DUAL
LISTEN

9

9

CH2+2

5

5

O
N

1/C

CH2+1

LEVEL

B

AUX

B

RECEIVE

RECEIVE

ANTENNA110/220VACINPUT

FUSE: F1.5A250V

TR-500s

elex

T

CAMERA 1

elex

CAMERA 2

T

elex

FLOOR

MANAGER

T

elex

FLOOR

AUDIO

T

Figure 49

Example of Six BTR-500 RTS Systems used by a Production Unit

-27-

50

TERMINATORS

FOR TWO UNUSED

(

RX PORTS

EXTRA

(

elex

T

Eight Base Station Telex System

1 = BELTPACK POSITION 1
2 = BELTPACK POSITION 2

*

SPOTTER
1 = MAIN DEF
2 = PRIVATEDEF

*

POSITION COACH
1 = MAIN DEF
2 = PRIVATEDEF

***

DEFENSIVE COACH

1 = MAIN DEF
2 = PRIVATEDEF

PRESS BOX

SPOTTER
1 = MAIN OFF
2 = PRIVATEOFF

***

POSITION COACH

1 = MAIN OFF
2 = PRIVATEOFF

OFFENSIVE COACH

1 = MAIN OFF
2 = PRIVATEOFF

BTR-600C

AUDIO CHANNEL 1 = MAIN OFFENSE
AUDIO CHANNEL 2 = PRIVATE OFFENSE
AUDIO CHANNEL 3 = MAIN DEFENSE
AUDIO CHANNEL 4 = PRIVATE DEFENSE

1 = PRIVATEOFF
2 = PRIVATEDEF

CABLE

A

ANT.
ANT.

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

TELEX RTS

CH2+2

O

A

F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

A

ANT.
ANT.

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

TELEX RTS

CH2+2

O

A

F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

A

ANT.
ANT.

DUAL

XMIT

LISTEN

MODE

I

/C

REMOTE

TELEX RTS

CH2+2

O

A

F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

A

ANT.
ANT.

XMIT

LISTEN

MODE

I

/C

REMOTE

TELEX RTS

CH2+2

O

A

F
F

B

TRANSMIT

CH2+1

CONT.

CHANNEL

EXTRA

ASSIGNMENT / DISTRIBUTION

2CH

AUDIO

INTERCOM

ASSIGNMENT / DISTRIBUTION

LOOP
THRU

PUSH
PUSH

PUSH

1

1
6
6

6

9
9

9

5

5

O
N

1/C

LEVEL

LOOP
THRU

PUSH
PUSH

PUSH

1

1

6

6

9

9

5

5

O
N

1/C

LEVEL

LOOP
THRU

PUSH
PUSH

PUSH

1

1

6

6

9

9

5

5

O
N

1/C

LEVEL

LOOP
THRU

PUSH

PUSH

PUSH

1

1

6

6

DUAL

9

9

5

5

O
N

1/C

LEVEL

PANEL

B

AUX

B

AUX

B

AUX

B

AUX

AUDIOCOM

POWER SUPPLY

INTERCOM

PANEL

AUDIO CH 1
AUDIO CH 2

A

LOOP
THRU

PUSH

ANT.

1

ANT.

A
B

TRANSMIT
CHANNEL

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

TELEX RTS

CH2+2

5

O

O

F

N

F

1/C

CH2+1

LEVEL

CONT.

A

LOOP
THRU

PUSH

1

ANT.
ANT.

A
B

TRANSMIT
CHANNEL

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

O

F

N

F

1/C

CH2+1

LEVEL

CONT.

A

LOOP
THRU

PUSH

ANT.

1

ANT.

A
B

TRANSMIT
CHANNEL

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

5

5

TELEX RTS

CH2+2

O

O

F

N

F

1/C

CH2+1

LEVEL

CONT.

A

LOOP
THRU

PUSH

ANT.
ANT.

1

1

6

6

DUAL

XMIT

LISTEN

MODE

I

/C

9

9

REMOTE

TELEX RTS

CH2+2

5

5

O

A

O

F

N

F

B

1/C

TRANSMIT

CH2+1

LEVEL

CONT.

CHANNEL

PUSH

AUX

PUSH

AUX

PUSH

AUX

PUSH

AUX

AUDIO CH 3

AUDIO CH 4

B

B

B

B

Telex

A

B

TX ANTENNA

Telex

TRANSMIT
ANTENNA

RX ANTENNA

ON FIELD

T

elex

COACH 2
OFFENSE

BELTPACK

1 = MAIN OFF
2 = PRIVATE OFF

HEAD

COACH

BELTPACK

1 = MAIN OFF
2 = MAIN DEF.

*

T

elex

**

Example of an Eight BTR-600C Audiocom(Telex) System being used by a Football Team

T

elex

COACH 3
OFFENSE

BELTPACK

1 = MAIN OFF
2 = PRIVATE OFF

T

elex

COACH 4
OFFENSE

BELTPACK

1 = MAIN OFF
2 = PRIVATE OFF

*

Figure 50

BELTPACK

*

-28-

T

elex

COACH 5
DEFENSE

1 = MAIN DEF
2 = PRIVATE DEF

TRANSMIT

SC600

BELTPACK

*

DC

RECEIVE

OUTPUT

110/220VACINPUT

FUSE: F1.5A250V

T

elex

COACH 6
DEFENSE

1 = MAIN DEF
2 = PRIVATE DEF

RECEIVE

ANTENNA

COACH 7
DEFENSE

BELTPACK

1 = MAIN DEF
2 = PRIVATE DEF

*

T

elex

COAXIAL
CABLE

COACH 8

EXTRA

BELTPACK

1 = PRIVATE OFF
2 = PRIVATE DEF

*

T

elex

Beltpack to Beltpack System

The following is an example of a beltpack to
beltpack system. The two operators need to be in
constant, full-duplex communication with each
other in a noisy paper press environment.

Single Beltpack to Single Beltpack System

RF

TX = FREQ 1

RF

RX = FREQ 2

T

elex

T

elex

RF

TX = FREQ 2

RF

RX = FREQ 1

Figure 51

Example of a TR-500 System used at a Publishing Firm

-29-

System Walk-Thru

Now that you have successfully “set up” your Telex
Wireless Intercom System and turned on any auxil­iary equipment you are ready to test the overall per­formance by “Walking” the Telex system through
the areas in which you will be using it.

Before you begin your walk-thru, check the follow­ing:

Beltpack Battery Check.

❒

Set microphone gain in both the beltpack and

❒

the base station.

Check that the push-to-talk switch is engaged

❒

in the lock-to-talk position. LED will be illu­minated.

I/C Level “IN” and “OUT” are set to an ap-

❒

propriate level and not turned to zero.

Sidetone local and beltpack levels are set to

❒

an appropriate level.

The “system walk-thru” can detect problems of
weak signal strength caused by:

· Poor antenna location

· Wrong antenna for receiver and/or transmitter.

· RF “Trouble Spots”

· Operating distance beyond system capability.

· Old or used batteries in the TR-500/600

Under normal conditions the indicator LED on the
base station’s beltpack should always be lit when
their beltpacks are transmitting. “Weak Signal” con­ditions will result in flashing, or the complete loss
of this Carrier LED.

In 99% of all instances you will set up your Telex
Wireless Intercom System, walk it through and
achieve error-free performance. If in the rare in­stance your Telex system does not “pass” during
your walk-thru evaluation, refer to the section of
this manual which deals with System Trouble­shooting.

-30-

TROUBLESHOOTING

Reread the sections of this manual to make sure you
have completed system set-up properly

PROBLEM SOLUTION

DISTORTION - System’s audio quality seems

distorted at medium to high input levels.
HISS - System seems to produce a “hiss” which is

undesirable.
LOW OUTPUT - System produces a low output

level.
FEEDBACK - Moving around area of use

produces “squeal” or “howl” in various locations
using ext. speakers.

DROPOUTS - When moving around the area of
use there seems to be locations where the signal
“swooshes” or completely disappears.

INTERFERENCE - System picks up signals
other than wireless Intercoms.

If you are unable to solve the problem, contact the
dealer from whom you purchased the system for as­sistance.

Reduce microphone gain by adjusting
microphone gain control.

Check the gain setting on all beltpacks and the
base. They may be too low.

Check the gain setting on both the beltpacks and
the base. They may be too low.

Reduce the gain settings on both the beltpacks and
the base. They may be too high.

Make sure both antennas on the base are
connected and follow the location suggestions.
Change the location of the base unit and antennas
or avoid the bad areas with the remote beltpacks.

Make sure the Telex beltpack is turned on - this
will usually eliminate the interfering signal. If not
using a beltpack, make sure the transmit mode
switch at the base is in the off position.

If problems persist with the beltpack on, you will
probably need to change frequency channels.
Make sure the base channel switch matches the
beltpack.

NO AUDIO from BASE or BELTPACK headsets.

Check Transmitter switch on base, use CONT or
REMOTE position. Check push-to-talk function ­is the switch ON. Make sure beltpack batteries are
OK.

-31-

Tech Tips

Codes Settings and the BTR600C

While the BTR-600C and corresponding TR-600C
have over 65,000 different codes that may be se­lected by the user, there are actually over 16 million
different codes in the units. The microprocessor in
each base station and corresponding beltpack has
two unique numbers programmed into them from
the factory. The external four code switch settings
are used in conjunction with these two internal,
non-accessible, numbers to encrypt and decrypt au­dio sent to and from the units.

Frequency Interaction

Unfortunately, radio frequency (RF) channels can­not be randomly selected for use in radio devices.
They must be selected to avoid known frequencies
in use, FCC restrictions on the location of devices,
and even interference between your own RF de­vices. The channels selected by Telex for Radiocom
systems are chosen to minimum possible interfer­ence. This is why it is always important to inform
Telex about frequencies of other Radiocom or other
RF devices that will be used with any additional
Radiocom equipment ordered.

Microphone Gain Adjustment

The microphone gain controls on the base station and beltpack are set to mid-levels by the factory. In
most cases this setting will work fine and only on loudest speech will the overmodulation (OM) indicator
light. However, in environments where the background noise is loud or the user has a strong/quiet voice,
the gain control will need to be adjusted. In Figure 52 the gain is set correctly. The user ’s
root-mean-square (RMS) sound level is well below the OM threshold and only on a few loud peaks does
his or her voice flash the OM indicator light. Figure 53 displays the same gain setting as in Figure 52, but
brought into a high noise environment. The user’s voice now lights the OM indicator over half the time he
or she speaks due to the higher noise plus the user speaking louder. The result on the system is distortion
with possible “clipping” on louder speech. The microphone gain must be reduced. The same applies to a
user with a powerful voice. If someone sets the system mic gain to their voice and user has a much stron­ger voice, then the gain will need to be reduced, even if the background noise is the same.

Always remember to set the microphone gain based on the situation and location in which the equipment
will be used. If the equipment is used on the field during a football game, set the gain based upon a loud
stadium, NOT the quiet stadium 2 hours before a game. If a production studio user has a quiet voice, set
the gain to their voice and NOT the stage hand’s loud voice who helped set up the system.

USER'S VOICE

OM THRESHOLD

USER'S VOICE

SOUND LEVEL, RMS

NOISE

Figure 52

Low Noise Environment

Microphone Gain Set Correctly

SOUND LEVEL, RMS

Figure 53

High Noise Environment

Microphone Gain Set Too High

OM THRESHOLD

NOISE

-32-

R

R

Battery Information

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 reliable operation in
wireless transceivers. Typical battery life of fresh al­kaline batteries is 12 hours. The use of low cost

carbon-zinc batteries is NOT recommended.

Intercom Systems Specifications

RTS

Input Impedance:..............................................200W

Output Level: ............................0.775 Vrms nominal

Bridging Impedance:......................................>10kW

Call Signalling:

Send: ...................20kHz ±100 Hz, 240 mVrms

Receive: .............20kHz ±800 Hz, 100 mVrms

Power Voltage: ...........................28.0 VDC nominal

Nickel-Metal Hydride Batteries: These batteries
can save you money in the long run, as they can be
recharged. Typical battery life is 8 to 9 hours, which
is about 70% of the length of time alkaline batteries
last.

Energizer® is a registered trademark of Union Carbide Corporation.
Duracell® is a registered trademark of Duracell Inc.

COMMON
AUDIO 1 PLUS POWE

1

3

MALE

2

AUDIO 2

AudioCom/Telex

Input Impedance:..............................................300W

Output Level: ................................1.0 Vrms nominal

Bridging Impedance:......................................>10kW

Call Signalling:

Send: ....................20kHz ±100 Hz, 0.5 mVrms

Receive: .............20kHz ±800 Hz, 100 mVrms

Power Voltage: ...........................24.0 VDC nominal

Clear-Com

Input Impedance:..............................................200W

Output Level: ...............................200 Vrms nominal

Bridging Impedance:......................................>10kW

Call Signalling:

Send:.................................................12±3 VDC

Receive: ................................4 VDC Minimum

Power Voltage: ...........................30.0 VDC nominal

-33-

1

3

MALE

1

2

3

MALE

COMMON
AUDIO(-)PLUSPOWER

AUDIO ( + ) PLUS POWE

COMMON
POWER

2

AUDIO

Accessories and Replacement Parts

ALP-600

520-760 MHz Bi-Directional Log Periodic Antenna
Includes mounting hardware and 10 feet (3 meters)
of coaxial cable with TNC Connectors

Order No. 878896

elex

T

Antenna Cables: Special low loss antenna cables
with TNC Connectors.

Model No. Length Order No.

CXU-10 10 Ft. (3 meter) 690419
CXU-25 25 Ft. (7.6 meter) 71151-025
CXU-50 50 Ft. (15 meter) 71151-050
CXU-75 75 Ft. (23 meter) 71151-075
CXU-100 100 Ft. (30 meter) 71151-100

Telex

ALP-450

THIS END TOWARD TRANSMITTER

ALP-450

450-900 MHz Log Periodic Antenna
Includes mounting hardware and 10 feet (3 meters)
coaxial cable with TNC connectors

Order No. 71147000

BTR Power Supply.................................PN 730127

BTR Intercom Patch Cable.....................PN 690412

BTR Intercom Dummy Load

Telex type............................................PN 878935

RTS type..............................................PN 878990

TR Battery pack, alkaline

(batteries not included)..................PN 71215-000

1/2-Wave Antenna

Model No. Part No. Band Color Frequency

CLA-1 870658-1 Blue 520-564.9 MHz
CLA-2 870658-2 Yellow 565-614.9 MHz
CLA-3 870658-3 Red 615-659.9 MHz
CLA-4 870658-4 White 660-689.9 MHz
CLA-5 870658-5 Green 690-724.9 MHz
CLA-6 870658-6 Orange 725-760 MHz

TR Nickel Metal Hydride Battery pack

with “Smart Charger”....................PN 71215-200

TR Nickel Metal Hydride

Battery pack...................................PN 71215-002

SC600 Splitter/Combiner...................PN 71197-000

Single 19" Rack Mount Kit ...............PN 71081-006

Mounts one base station in a 19" rack

Dual 19" Rack Mount Kit..................PN 71081-007

Mounts two base stations, side by side

in a 19" rack

Signal Switch Option...........................PN 878811-1

This option allows the user of a beltpack to re-

motely activate special relay contacts on a base

station
CCB-1 Interface Device

Interfaces Telex balanced to ClearCom

unbalanced. One CCB-1 is required for each au-

dio channel.

Order No. 96230-000

-34-

CUSTOMER SERVICE INFORMATION

If your receiver or transmitter should need servicing, please contact:

Customer Service Department
TELEX COMMUNICATIONS, INC.
8601 East Cornhusker Highway,
P.O. Box 5579,
Lincoln, Nebraska 68505-5579 U.S.A.
Phone: [phone] 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 establish warranty. A letter should be included outlining all symptoms and claimed de­fects. Information 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 place. 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
assuming any obligation to install the same on any of its products previously manufactured.
Further Telex reserves the right to ship new and/or improved products which are similar to
the form, fit and function of products originally ordered.

-35-

FCC INFORMATION

The Telex BTR-500/600C and the TR-500/600C Transmitter/Receiver are Type Ac­cepted under United States Federal Communications Commission Part 74. Licensing
of Telex equipment is the User’s responsibility and licensibility depends on the user’s
classification, users application, and frequency selected. Telex strongly urges the user
to contact the appropriate telecommunications authority for any desired clarification.

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

-36-

R

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

PN 801567-2 JAN 2001 Made in U.S.A.