AUDIO TELEX AT User manual

AUlitD]ilil@
OPERATING
INSTRUCTIONS A"
SERIES PA MIXER
AIVIPLIFIER
AUDIO TELEX COMMUNICATIONS PTY LTD
NSW & ACT
Private Bag 114
Ermington 2115
149 Beaconslield St
Silverwater 2128
Ph [phone] 1
Fax [phone]
QLD & NT
PO Box 871
Fortitude Valley 4006
42 Commercial Rd
Fortitude Valley 4006
Ph [phone]
Fax [phone]
vtc
PO Box 468
Mt Waverley 3149
4/26-30 Howleys Rd
Notting Hill 3168
Ph [phone]
Fax [phone]
WA
PO Box 489
7/64-66 Kent St
Cannington 61 07
Ph (09) 3s62761
Fax [phone]
SA
Electronic Concepts
PO Box 7034, Hutt St
Adelaide 5000
76 George St
Thebarton 5031
Ph [phone]
Fax [phone]
r4s
K.W. McCulloch
54A Albert Rd
PO Box 363
Moonah 7009
Ph [phone]
Fax [phone]
NEWZEALAND
PO Box-512
Unit B,
11 Piermark Drive
Albany 1331
Ph [phone]
Fax [phone]

ERATING INSTRUCTIONS IT SERIES AMPLIFIERS
AT SERM,S MIXER AMPLIFIERS
Congrafulations on purchasing an AT Seris; Mixer Amplifier. As yort are no doubt arvare. MAINS POWER MUST BE
DISCONNECTED BEFORE REMOVING THE LID OR MAKING ANY INTERNAL ADJUSTMENT TO THE
AMPLIFIER
The AT Mixer Ailrplitiers are self standing with rubber feet. They may be stackerl to a maximun ol tour sxj1' high. An IEC type
nnins cord an4 receptacle is provided, the receptacle also houses the mains f-use in a drawer, which pulL oftrl trr e\pose the fuse.
SETTING UP
oooo o,o,
;.
PANEL CONTROLS (fig l );
i _1 1 CUt-+ Marked one to four tlrese i:ontrols will respontl to either Microphone lnptrls or the Auxiliary InpuLs conne.cted at the
rcar of the amplifier( .ctc Connedion.; lalcr n the-se n.cmtc'tion'c ).
The setting will depend upon the sensitivify of the Microphone or Auxilian' progrim source. Generally a setting of seven will be
ideal for a standard dynamic microphone and five lbr most program inputs. However as conditions vary , adjust the setting to suit
the required perfbrmance levcl tbr your system.
i t BASS The Bass control will normally be operated in the mid position (5) to obtain a flat response from the amplifier' To
booit the bass response of the anrplifier , turn the conEol towards the higher number setting .To reduce bass response turn the
confiol toward the lowcr numberrd setting . For many paging only systems it is a good idea to operate the bass control in
a lower setting, to cut bass and improve intelligibility, however rhis may depreciate the amplifiers' performance for
music reproduction.
i - j I TREBLE The Trcble control will normally be operated in the mid position (5) , to obtain a flat response from the
o*ptiti". .To boost the high frequency respor$e of the amplifier , turn the control towards the high nrrmbered setting. To reduce
tSehigh fraluency response of the amplifier , nrn the control towards the lower mrmbff setting.
-11
position
required.
i - erl CALL The ORANGE "AU call " switch when pusherl on , will conncct the 100 volt output of the aniplifier to all
speakers or zones .Push the switch again to tum off this function.
| 6 SpEAKER SELECTOR The speaker selector consists of six BLACK speaker or zone selector switches designated one to
ii*-i rout in the case of the AT30 ) . press the switch "IN" to turn it on, this will connect the 100 volt output of the amplifier to
the speaker or 21)ne selected . push the switch again to turn off this function. Any conbination of switches may be activated
simultaneously , Each switch has a maximum capacity of 60 watts. Care should be taken to ensure the total power of the amplifier
is not exceed e(Connection for each of fue gnaker or zon6 ts' made at the rea.r of the amphlier , 'w "Connrctnns " later m
furc msauctrorc. )
7 18
MASTER This control adjusts the overall volurne from the output of the mixer section of the amplitier. The normal
for this control is 6, providing scope for the volume level to be adjusted up or down from the normal positron as

OPERATING IN STRUCTIONS ,,4T SERIES AMPLIFMRS
] LII{IT Thc light emiting diode designated "Limit" , will provide the user with an indication of any ovcrload contlition of
the amplitier :ening. The lamp will normally ilicker occasionally RED when the amplifier is operating normally . If the lamp
flickers RED tbr lengthy periods or glows continuously , the amplitier is being overdriven by the incoming prograrn or
microphone. if this condition is combined with a maximum load on the output the amplifier will shut down fbr two seconds and
then turn irelr hack on . Should the condition still apply , the arnplifier will continue to cycle off and on until the condition is
removed. This is a feature of the amplifier deriigned to protect the amplifier circuitr.v and the speakers connected to the output.
8 POWER Thc switch designated "Power", turns the mains power to the amplifier "ON/OFF. A lamp will glow Red to
indicate tle anplifier is fumed orr.
I
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ATEO 2A AC
AT3O IA AC
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AUDIO TELEX C(ruNrc IONA PTY LTD
9YDNEY AUSTEALIA
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TAPE &I CH4
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pull out drawer. The mains cord must be
indicated above the IEC connector are the
1 THREE PIN IEc MAINS INLET z4ol 120 vac with inbuilt fuse in a
removed bef,ore the drawer can be pultred to expose the fuse. Note the fuse ratings
correct AC fuse ratings fbr 240 VAC operation.
2 DIRECT OUTPUT TERMINAL STRIP counting left to right :
C... Common connection tbr low impedance ourputs
4..... 4 ohm output connection (AT120 only )
8..... 8 ohrn output connection
C..... Common connection for constant voltage outpuls
74....70 volt output
100.. 100 volt output
Spare Terminal
Spare Terminal
[:--] SWITCHED OUTPUT TERMINAL STRIP counting left to right:
6..... 100 volt output connections for speakcr switch 6
5 100 volt output connections for speaker switch 5
4 100 volt output connections for speaker switch 4
3 100 volt output connections for speaker switch 3
2 100 volt output connections for speaker swirch 2
I 100 volt output connections lbr speaker switch I
NOTE I
For model AT30 there are four only switched speaker ou@ut connections.
CONNECTIONS (ne2)

PERATING INSTRUCTIONS IT SERMS AMPLIFIERS
CONNECTIONS ( CONT )
' + fnpn OUTPUT CONNECTION high impc<lance RCA type phono socket.
j- UICROPHONE INPUTS Four XLR Switchcraft female 3 pin active balanced microphone inpur: . 100 ohms, designated
CH4 CH3 CH2 CH L Corrtrcetiorts art :
Pin I ..... earth
Ph 2 ..... ac:tive balanced
Pin 3 ..... active balzurcecl
6.t AUXILIARY INPUTS Four RCA t,vpe single auxiliary inpuls for tape or other high level program \ourcc. designated CH4
CH3 CH2 CHI .
NOTE 2
All fbur inputs dasignated CHI TO CH4 can be used fbr microphone and auxiliary input sources. It is also possible to connect
both microphone and auxiliari' inputr to one channel simultaneously. however their rclative levels to one another u'ill be fixed ,as
there is one gain control fbr each channel on the front panel.
ACCESSORIES
TX3010 MUTTNG MODULE : By means of the TX30l0 all AT Amplifien provide the facility to mute Channels 2 and 3
automatically , from Channels l. 2 or both.
Muting is voice switched fronl a nricrophone or auxiliar.v input. It is assumed that tbr mosl applications . microphone inputs
would be connected to Channel 1 or 2 and auxiliary. inpuls connected to Channels 3 or 4 . Once tie muting module is installed ,
any voice input from the microphones or auxiliar_v ilputs in Channel I or 2 wili automaticall-v muls fhannsls 3 & 4 . Instantly
the voice input ceases, txrth muted ctrannels will revert to their previous condition.
INSTALLATION ;To install the TX3010 muting module ;
A. Disconnect the mains power remove the mains cord .
B. Remove the lid which is held to the chassis try 5 screws on either side of the cabinet and 4 screws on the top of tie lid.
C- Locate the 5 pin socket on tie circuit board associated with Channels I &.2.( It is the only 5 pin socket on the board.)
D. Plug the TX30l0 module in to the socket and attach it to a convenient area on the base of the amplifier chanis by means of
the indusnial double sided tape provided on the module. Don't forget to rernove the protective film to expose the adhesive side.
E. Replace the lid and reconnect fts 6rins power.
TONE GENERATOR MODULES
Four types of tone modules are available for use with AT Amplifiem ;
ATC5227-l Continuous bell tone
ATC5228-| Pre announce tone
ATC5229-I Evacuation tone ( compliqs with AS2220.1 )
ATC5230-1 Alert tone ( complies with AS2220.1 )
A feature of the modulas ls the automatic muting function , which mutes input number 4 of the AT amplifier automaticalty, when
the tone generator i-s operated.
UDIO TELEX COMMU{ICATIONS PTY LTD MANTIFACTURED IN AUSTRALTA

t
I
ATING INSTRUCTIONS IT SERIES AMPLIFMRS
INSTALLATION : Tone Generaton ;
A. Disconnect the mains power and remove the nrains cord
B. Remove the lid which is held to the chassis by 5 screws on either side of the cabinet and 4 screws on thc top of the lid.
C. Locate the 7 pin socket on the oircuit board. ( There is only one 7 pin socket on the board, )
D. Plug the Tone Module in to the socket and attach it to a convenient area on the base of the chassis, by nieans of the industrial
tape provided on t}te module.
E. Connect the on/off wires to the spare tenninal on the direct output terminal strip at t}te rear panel of the anplifier. By means
of these terminals , the tone generator ma-y be connected to any rernote switch to tum the generator on and ofT.
F. Replace the lid and reconnect the mains power.
NOTE 3
Full connection and circuit details are supplied with each module.
AT AMPLIFIERS FUSE RATINGS FOR 240 VAC.
Located on tlte rear panel ;
AT30 .... I amperes ac
4'T60 .... 2 ampere.; ac
ATl20 ...4 anperes ac
NOTE 4
The DC high tension fuse is located on the circuit board . This is a feature of the AT Amplifier, which is equip@ with a current
limiting circuit preventing excessive DC currents,thus eliminating the risk of blowing high tension fuses. In the unlikely event
that the high tension fuse actuates , the output transistors should be checked , as it is probable the amptifier has been subjected to
very extreme conditions .
t
\
Freq Response
Power Output (rms)
Max l,oad
Mic / Aux Inputs
Mic Scnsitivity
Aux Sernitivity
Signal 1s nqise
Outputs
Distortion @lk,hz
Tape OuQut
Phantom Power(l5v)
Speaker Selection ( l00v)
ICAL SPECIFICATIONS AT6O
50hz -- 15 khz +- 3dB
60w
170 ohms
4
1mv
300mv
-76d8
100r0v
8 ohms
0.270
3OOmv
CH1
6 zones
AT3O
30w
333 ohms
4
lmv
3Oomv
-76d8
l0o/70v
8 ohms
0.2%
30omv
CHI
4 zones
ATI20
120W
80 ohms
4
lmv
3O0mv
-76dB
100tr0v
$S{ ehms
0.4%
3OOmv
CHI
6 zones
UDIO TELEX COMMLINICATIONS PTY LTD MANUFACTURED IN AUSTRALIA