Telex RadioCom TR-34 Manuale utente
Telex
Operating Instructions
TR-34 TUNABLE RECEIVER
TT-44 TRANSMITTER
R
RadioComTM
WIRELESS IFB SYSTEMS
PROFESSIONAL
WIRELESS IFB SYSTEM
INTRODUCTION
WHAT IS THE TELEX WIRELESS
IFB SYSTEM?
Transmitter: The transmitter generates and
amplifies an RF (Radio Frequency) carrier
signal, modulates this carrier with the micro-
phone signal, and radiates the modulated RF
carrier.
Receiver: The FM VHF receiver is tuned to
the frequency of the transmitter. The receiver
picks up the radiated RF signal from the trans-
mitter through the antenna and converts the
RF signal into audio voltages for use with an
earphone, headphone, button receiver,
neckloop, etc. The receiver frequency must be
matched to the transmitter frequency.
WHAT FREQUENCY BAND DOES
THE TELEX SYSTEM OPERATE
IN?
The Telex Systems features a synthesized
transmitter and a synthesized receiver operat-
ing in the VHF Band between 60-72 MHz.
See Table 1 for standard frequencies avail-
able.
Up to five transmitter channels can be utilized
by any number of receivers in any given area.
-1-
Figure 1
Block Diagram of Typical Wireless IFB System
OFTEN ASKED QUESTIONS
Question: Can more than one system be
used simultaneously?
Answer: Yes but never on the same fre-
quency. You will need to have different fre-
quencies for every receiver/transmitter
combination. All transmitters are factory set
for specific frequencies.
Question: Is the system more sensitive in
any one particular direction?
Answer: No, the transmitter’s antenna radi-
ates equally in all directions, but the signal is
attenuated by your body, walls or other sur-
rounding objects. The receiving antenna is es-
sentially sensitive in all directions as well.
Question: Can the receiver receive other
transmissions when the transmitter is turned
off?
Answer: Yes it can. Telex systems operate
in the VHF Band between 60-72 MHz. How-
ever, it is not susceptible to radio wave skip,
CB’ers or standard FM radio transmissions.
The frequency your system operates on is
computer selected for least interference, but
there is no such thing as a 100% clear channel
all the time, anywhere in the U.S.A., forever!
If the system is going to be used in a perma-
nent fixed location, it should operate interfer-
ence free until such a time or date when
someone else begins using the same fre-
quency.
If the system is going to be moving among
various locations, you may run into occasional
frequency conflicts.
Whenever the system is in use, the transmitter
should be left on to prevent the receiver from
picking up outside interference.
-2-
Table 1
Standard Frequencies Available
-3-
CHANNEL FREQ. in MHz
1 64.500
2 64.700
3 64.900
4 65.100
5 65.300
6 65.500
7 65.700
8 65.900
A 66.100
B 66.300
C 66.500
D 66.700
E 66.900
F 67.100
G 67.300
H 67.500
TECHNICAL INFORMATION
TR-34 RECEIVER
General Description TR-34
The Telex TR-34 Receiver is a component of
a system which operates on 16 selectable
channels in the 60-72 MHz frequency band.
The receivers are designed to be used with the
Telex TT-44 Transmitter.
Operating Features
Volume OFF/ON Control: This thumbwheel
control serves as both an off/on switch and as
a volume control. The receiver is turned off
when the control is in the extreme coun-
ter-clockwise position, when viewed from the
front, and the volume is loudest when the con-
trol is in the extreme clockwise position as in-
dicated on the volume control.
NOTE: The Headphone Jack must have a
headphone, or other accessory, plugged in
to activate the TR-34 power “ON”. Power
“ON” is indicated by the lighting of the
channel numbers.
Headphone Jack
The headphone jack accepts a 0.140-inch (3.5
mm) diameter miniature mono or stereo phone
plug. A variety of accessory units can be
plugged into this jack for reception of the de-
sired channel(s) being transmitted.
Treble Control
A push button treble control is provided to en-
hance the “high” audio when the button is en-
gaged, indicated by , the “High” audio is
emphasized.
Belt Clip
The belt clip supplied is detachable by spread-
ing the wire apart at the tops and removing
one side of the clip from the case and then the
other.
-4-
-5-
TR-34 Specifications
Temperature Range....................................................................................0 to +50 degrees C
Supply Voltage ..........................................................................2 - 3 Volts, (2) AA Batteries
Battery Life...........................................................................................16 - 20 Hrs - Alkaline
8-10Hrs-Nickel-cadmium
Frequency Response 100-10 kHz....................................................Less than 3 dB Variation
Sensitivity (12 dB SINAD @ 66.1 MHz)................................................................1 uV max
Distortion..............................................................................................................less than2%
Controls and Connections...............................................................Volume OFF/ON Switch,
Treble Control Switch,
Channel Selection Switch,
Headphone Output Jack
Figure 2
Operating Features of TR-34
TT-44 SYNTHESIZED
TRANSMITTER
General Description
The Telex TT-44 is a portable base station
transmitter which operates in the 60-72 MHz
band and accepts intercom audio input levels.
Operating Features
Main Power Switch and Indicator LED:
The Power “ON” LED is illuminated when
the Power OFF/ON switch is ON. It remains
illuminated while the transmitter is on.
Channel Select
This control is rotated in the clockwise and
counterclockwise directions to attain reception
of the desired channel(s) being transmitted
within the 60-72 MHz frequency band.
RF Power Switch: 50 mW max in “Hi”, ap-
proximately 5 mW in “Low”.
Audio Level Meter: Provides visual indica-
tion for setting input levels.
Audio “Monitor” Output Jack: 1/4" jack
provided for headset connection.
Audio “Monitor” Level Control: Adjusts
output level for monitor headset.
Balanced Audio Input Connector: Accepts
balanced two wire line or RTS two channel
line.
Balanced Input Selection Switch: Selects
either balanced two wire, RTS channel “1" or
RTS channel ”2".
Balanced Input Level Control: Adjusts input
level for all balanced input modes.
Unbalanced Audio Input Connector: Ac-
cepts unbalanced audio via 1/4" plug.
Unbalanced Audio Level Control: Adjusts
input level for unbalanced input mode.
Antenna Jack: Accepts 50-ohm whip (sup-
plied).
Power Input Jack: Accepts either AC Power
adaptor (supplied), or any source of 13 VAC
300MA or 15 to 24 VDC 300MA.
-6-
MAIN POWER SWITCH
AUDIO LEVEL METER
-10 -5 0 +3 +6
RadioCom
Synthesized
B
C
D
E
F
GH
TM
Wireless IFB Transmitter
TT-44
Figure 3
Operating Features TT-44
Front Panel
-7-
TT-44 Specifications
Audio Input: Balanced Female XLR
Input Impedance.............................................................................................150K ohms
Unbalanced Audio Input ..............100K Winput impedance/70 mV-7 Volt input range
RF Power Switch....................................50 mW max in “Hi”, approx. 5mW in “Low”
AGC Range.............................................................................................................30 dB
Signal-to-noise Ratio ..............................................................................................58 dB
Pre-Emphasis ..........................................................................................................100mS
Maximum Deviation ..........................................................................................±25 KHz
Frequency Control Crystal.................................................................+/-.005% tolerance
Available Frequencies ......................................................................See Table 1, page 3
Max. Transmitter Output Power ..........................................................................50 mW
Power Requirements............................13 VAC @ 300 mA or 15-24 VDC @ 300 mA
Dimensions .......................................................................7 1/2"W x 1 3/4"H x 6 7/8"D
FCC I.D. ..........................................................................................................B5DM507
Input
RTS CH1
RTS CH2
AudioCom
Pin Out
1-2
1-3
2-3
BALANCED AUDIO
INPUT CONNECTOR
POWER INPUT JACK
ANTENNA JACK
BALANCED INPUT
SELECTION SWITCH
BALANCED INPUT
LEVEL CONTROL
Telex Communications, Inc. MADE IN U.S.A.
Input-Intercom/IFB
Level Level
Unbalanced
RF Power
HI
LOW
Antenna
Power
RTS CH2
RTS
CH1Audiocom
15.24 VDS /13 VAC
PUSH
Audio Input
UNBALANCED INPUT
LEVEL CONTROL
UNBALANCED
INPUT JACK
RF POWER
SWITCH
Figure 4
Operating Features TT-44
Back Panel
TT-44 Transmitter
UNPACKING: Unpack your wireless IFB
system. If there are any damages or shortages,
refer to the “Warranty Service Information.”
TT-44 TRANSMITTER LOCATION: Se-
lect a suitable location for the TT-44 Trans-
mitter. Try to keep a clear, unobstructed path
between the transmitter and receiver and al-
low plenty of free space around the Transmit-
ter antenna.
POWER CONNECTION: Plug the supplied
AC power adaptor into a standard 120 vac
(U.S.A.) electrical outlet. Plug the other end
of the cord into the power input jack on the
rear panel of the TT-44 DO NOT TURN
UNIT ON AT THIS TIME.
Figure 5
Connecting Power
ANTENNA CONNECTIONS: Connect the
telescoping whip antenna to the rear panel
ANTENNA jack.
For best results, the antenna should be verti-
cally aligned. Tighten the coaxial connector to
hold the antenna in place, and extend the an-
tenna to full length.
Figure 6
Antenna Connection
-8-
CAUTION
Avoid heat sources when selecting a loca-
tion for the Transmitter. The heat given off
by radiators or direct sunlight may eventu-
ally damage the unit.
AUDIO INPUT: Select the appropriate input
on the rear panel switch depending on the in-
terfacing equipment. Then connect the audio
input to the rear panel XLR Jack or to the un-
balanced 1/4" input jack if required.
Figure 7
Balanced Input Jack, Switch, and
Level Control
Turn the input level control fully counter-
clockwise.
Figure 8
Unbalanced Input Jack and
Level Control
Turn the unbalanced control fully counter-
clockwise.
Refer to page 11, “Setting System Gain”, for
setting the optimum signal gain.
MULTIPLE SYSTEM
INSTALLATIONS: As with any radio de-
vice, interference can occur at any time. The
frequencies offered are shared with other le-
gitimate users. The severity of interference
varies with the distance to the interfering sta-
tion. Multiple systems further complicate in-
stallations. The following steps are suggested
in order to achieve best results in your instal-
lation.
1. In order to determine whether your selected
frequencies have minimum interference, Telex
recommends that you first temporarily install
the receivers only, in your proposed setting,
and monitor the channel for interference. To
do this, with fresh batteries installed, turn on
your receiver, but DO NOT turn on any other
receiver or transmitter at this time. Audible in-
terference may be present, indicating another
user on the channel. Monitoring should be re-
peated for each channel that you propose to
use.
2. Next, you must decide on the placement of
the various channels. This is best accom-
plished by placing adjacent channel operating
areas as far apart as possible.
3. For best results, each transmitter should be
installed separately in its own service area.
The Transmitter should now be ready for use.
NOTE: When not in use, return the POWER
switch to the OFF position and unplug the
transmitter.
-9-
Level
Unbalanced
Audio Input
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