AUDIO TELEX AT120-3 User manual

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COMMUNICATIONS
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AT60-3
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Mixer Amplifiers
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Audio Telex Communications Pty Ltd
ACN 001345482 lncorporatsd ln t{SW
NSW & ACT QLD & NT
149 Beaconsfleld Street
Prlvate Bag 149
Sllverwater NSW 2'128
Austrella
Ph02s64T 14't1
Fax [phone]
42 Commercaal Road
PO Box 871
Fortltude Valley QLD 4006
Ph 07 3852 1312
Fax [phone]
2!277 nudlEDp,rough Road
Box Hlll VIC 3128
PO Box '15'l
Blackbum South VIC 3130
Ph 03 9890 7477
Fax [phone]
7/64€6 Kent Street
PO Box 489
Cannlngton WA 6107
Ph 08 9356 2761
Fax [phone]
El€ctronlc Concepts Pty Ltd
76 George Street
Thebarton SA 5031
PO Box 7034 Hutt Stre€t
Adelald€ SA 5000
Ph 08 8234 9444
Fax [phone]
K W tcculloch Pty Ltd
&la Alb€rt Road
lroonah TAS 7009
Ph 03 6228 6373
Fax [phone]
Unlt B, 11 Plermark Orlve
PO Box 5{ 2
Albany NZ 1331
Ph 09 415 9426
Fax [phone]

AT60-3 Mixer Amplifier
ATI 2O-3 Mixer Amplifier
Product Description
Th9 AT60 is a 60 $€tt mixer amplifier and similarly the ATl20 is a l2o *ztt mixer amplifier. Both models operate on 240 VAC,
50 Hz (or I l0 VAC with factory modificauon) and may be desk or rack mounted via an optional rack mount kit. Both amplifie6
incorporate a 6 zone 100 volt line sfraker zone selector with all call. The A,T60 will deliver 60 watts into a load of g otrms, ZO or
100 volt line. The AT120 will deliver 120 watts into a load of .l or 8 ohms. 70 or 100 volt line. As standard both models are self
standing and come with rubber feet. They may be stacked to a maximum of four units high.
Front Panel Controls
t. Dual llicrophone/Line Gain Controls: The + duat mic/line inpur controls are labelled ch I through ro Ch 4
and should be adjusted to provide the rcquired mix levet for each individual channel. Start with the controls set to level 0 and
turn the controls clockwise until the desircd mix level for each channel is reached"
Bass Tonal Control: Sening this contml in the cente position will give an overall flat bass response !o the output of
the amplifier' Adjusting the bass control in a clockwise direction will provide up ro 12 dB of bass boo tt q rco ut. Adjusting
the bass control in a counter-clockwise direction will provide up to -12 dB of bass o,tr @ loo Hz.
Treble Tonal Control: Setting this control in the centre position will give an overall flat treble response to the output
of the amplifier. Adjusting &e Feble control in a clockwise direction will provide up to lo dB of rebt; boosr g touiy.
Adjusting the treble control in a counter-clockwise direction will provide up to -lO dB of treble cut @ lO l'l]|z.
aster Output Control: This controls the overall output level of the arnplifier depending on the levels set for the
individual iryut mir channels as detailed above. Start with the control s€t to level 0 and tum clockwise until the d€sired output
level of the amplifier is reached
All Call Button: When pressed, this orange button wilt connect the 100 volt output of rhe amplifier to all 6 of the
switched outFrts of the amplifier. Depressing this button again will disconnect the switcha ofiputs. fnis swiah is ,.push on-
push of' and is non-interlocking.
Speaker Selector Switches: Thes€ 6 black buttons are for swirching rhe 100 volr output of the amplifier to any
combination of fte 6 available speaker zones. The switches are'push on-push off'and are non-interlocking (boi6 with eacir
other and with the all-call button). The maximum capacity of each slBaker zone is 60 watts so care should be taken to ensure
that no individual zone is loaded down with any morc than 60 watts, always remembering that the total load for the AT60 is 60
watts in total and for the ATl20, 120 watts in total. Eg; It is pnssible on the ATl20, for example, to safely have one zone
loaded with 60 watts and the remaining five loaded with l2 wans each.
3.
4.
5.
Ar 1 20 EuDionirft

7. Limit LED: This red LED is designed to give the us€r an indication of the operating condilion of the amptifier and is
integral to the inbuilt protection included in the amplifier. This LED will glow red if the amplifier is operating into an excessive
load or ifone or mor€ of the input channels is supplving an unacceptably high level ofsignal. It is normal for this LED to flicker
on and off howwer. if it glows steaqt^ . the amplifier will shul down for a period of approximately 3 seconds and continue to cycle
in this fashion until the abnormal connection is removed or rectified. This is a featue of the amplifier designed to protect the
amplifier circuitry ald the speaken connected to the output.
Powef Button: ThiE switch controls the swilching of AC power to the amplifier. Rocking this switch upwards turns on
AC power to the amplifier while rockhg the switch downwards turns power off to the amplifier. When in the upard positio4
the red neon in the body of the switch will glow.
Rear Panel Connections
t. 3 Pin IEC ilains Power Inlet: the operating voltage is 240 VAC @ 50Hz or lloVAC@60H2. The AC power
voltage level is not extemally user adjustable but is factory pre-set. The intet is equippea with an inhilt AC fus€ holder fitted
with a 4 amp ftse (ATl20) or a 2 amp fuse (AT60) plus a spare for each found within the holder. Fower conslmption is 225VA
for the ATl20 and l25VA for the 4T60.
* Please ensure that the mains prower cord is dhconnected before attempting to ch€ck or r€place this fuse.
z. Direct Output Terminal Strip: fnese screw terminals allow access to the direct outpurs of rhe amplifier. 2 spare
screw terminals allow for the connection ofvarious tone module accessories. Reading from left to right the terminals are-
o Low Impedance Common
o 4 Ohms (Not aYailable on AT60)
.8Ohms
. Constant Voltage Common
. T0 Volt Line
. l@ Volt Line
o Spare
o Spare
Note: The minimum impedance at any time on maximum load for 100 Volt line shoutd be no less than E0 Ohrns for the AT120 and
no less than 170 Ohns for the 4T60.
3. Switched Outputs Terminal Strip: neaalng from left to right these screw terminal pairs correspond to the
switched 100 volt line outputs numbercd 6 through I as indicated on the front panel of the rmplifier. For each pat, the left hand
terminal is the common and the right hand terminal is the 100 volt output
Tape Output: RCA style phono output connector for line level output. Provides a maximum of 350mV into 10K Ohms,
ideal for a connection to most standard tape recorders. This outFut is sourced before the master gain control and as such, the
tape output level is not inlluenced by the operation of the master gain control.
4.
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s. Active Balanced, XLR Sockets ForThe llicrophone lnputs. with an input sensitiviry of 0.8mv @
200 ohms. Pin connections are: pin #l-earth; pin #2-active (high, +)t pin #3-active (low, -). Phantom fnwer of +15 volts is
available on all microphone inputs. Reading from left to right across the rear panel, the connection are for microphone inputs 4,
3,2,&lrespectively.
6. RCA Sockets For The Monaural Line Level lnputs. Inputs #'s 1,2 & 3 llave an input sensitivity of
75mV @ 47K ohns. Input l'4 has an inp.rt sensitivity of 250 mY @ 4TK ohms making it suitable for high level inpuls such as a
CD player. Reading from left to right across the rear panel, the connections are for inputs 4, 3, 2, & 1 respectively.
Optional Accessories
I The installation of some of the following optional acc$sories involves access to the inside of the amplilier. Installation
should only be attempted by a qualified technician. Always turn olf the AC power and remove the AC power cord before
attempting to rccess th€ inside of the amplifier. Please contact your near$t Audio Telex ofiice for details of your nearest
qualified technician.
Tone Genefators: Four separale tones are available as an option \/ia the ATC5488 tone gpnerator board. This intemally
mounred PCB is €asily fitted and plugs dircctly into a socket provided on the intemal circuit board PCB6I9E. Please follow the
inslructions supplied with the tone generator. When any tone from the ATC5488 is acti ted all inputs will automatically mute
except for input one.
Tones available on the ATC5488 tone generator board are:
Evacuation Tone (to Australian Standard L5222O.1.2)
Alert Tone (to Australian Standard A52220.1.2)
Bell Tone
Pre Announce Chime
TX3010 Vox tuting Module. When installed (as per the comprehensive instructions supplied with the fi3010),
channel I of the ampl.ifier will mute channels 2, 3 & 4 of the amplifier.
ATR KBLK. 19" rack mount kit
Fuse Sizes ATI 20 Amplifier
tains 240 VAC: 4 Ampercs Slow Blow
Fuse Sizes AT60 Amplifier
tains 240 VAC: z Ampres Slow Blow
Notes
The DC fts€ is located on the circuit board. This is a feature of the AT series amplifien, which is equip,ped with a cwrenr limiting
circuit preventing excessive DC currents, thus eliminating the risk of blowing high lension fuses. In the unlikely event that the DC
fuse actuates, the output transistors should be checkd as it is probable thar the amplifier has been subjected to very extreme
conditions-