Telikou SPK-200 User manual

TELIKOU Intercom System
SPK-200 Two-Channel Speaker Station
Instruction Manual
© 2006 TELIKOU Systems
All Rights Reserved

TELIKOU SPK-200 Two-Channel Speaker Station
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While TELIKOU makes every attempt to maintain the accuracy of the information contained
in its product manuals, the information is subject to change without notice.
I. Introduction
Thank you for choosing TELIKOU intercom product. The SPK-200 Two-channel
main station is a powerful, yet user friendly unit that serves as a heart of a
TELIKOU intercom system. We recommend you reading through this manual to
better understand the function of SPK-200. If you have any question that does not
addressed on this manual, please contact your dealer or call us. We are standing
by to assist you.
Description
The SPK-200 suits for TV station, communication command center, outside
broadcast vehicle, theater, project test field, and other applications which
communication is required.
This system adopts wired connection, and has following features, free of external
emission interference, stable and reliable performance, flexible configuration, full-
duplex communication, clear and loud communication sound, easy operation, and
strong noise resistance.
II. Characteristics
All operations can be finished on panel easily.
Remote Microphone kill Switch (RMK).
The level of speaker will lower when talk button is activated.
XLR and 1/4 inch compatible microphone jack.
Automatic circuit short protection and indication.
Sidetone Null adjustment.
III. Basic operations

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Front Panel
1. Headset connector
4-pin XLR Male or 5-pin XLR female connector
EARPHONE: Dynamic 50-2000 ohm
MICROPHONE: Dynamic 100-600 ohm
The wiring of headset is as follows:
Pin 1--Mic common
Pin 2--Mic hot
Pin 3--headphone common
Pin 4--headphone hot
Pin 5—Null
2. Panel Mic Connector
This is a double-purpose connector, supports both of unbalanced input
microphone with XLR plug and 1/4inch plug.
The wiring of 3-pin XLR microphone is as follows:
Pin 1 -- Mic common
Pin 2 -- Mic hot`
Pin 3 -- parallel connected with Pin 2 internal
3. Mic Select Switch
Set the Mic select switch to select whether the panel microphone or the headset
microphone is active.
4. Panel Mic Gain
It is used to increase or decrease the gain for panel microphone to achieve proper
microphone output level. It has no effect on the sensitivity of the headset
microphone.
Note: For earlier models, this adjustment button is in cabinet, and you can find
this adjustment potentiometer at the right side of front panel after opening the
top cover of cabinet. The microphone is set according to the Electret type before
delivery. If the type of panel microphone is changed, re-adjustment is required.
5. Mic Switch (Mic)
That turn up or down the Mic switch handle will send microphone signal intercom
line after amplification. When the switch is turned to ON or PTT, the LED (6)

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above will light. The settings are as follows:
ON: The selected microphone is activated, the switch is self-locked.
OFF: The selected microphone is off.
PTT: The selected microphone is activated, release and reset.
When the front panel speaker is turned on, pressing Mic button will reduce the
speaker output level about 6dB and help minimize feedback.
6. Mic LED
This LED lights when Mic switch (5) turns to ON or PTT.
7. Call Switch
Send call signal from host to the channel. Turn up or down the handle of call
switch, the LED (8) above selected channel will light (RED). This switch is without
self-locking function, release and reset.
8. Call LED
This LED will light under two cases: a) called: when the call signal from
communication channel is received; b) call: the call switch (7) is turned on.
9. Power Switch
Power switch is turned on, Power LED (10) light.
10. Power LED
This green LED lights on when the SPK-200 is receiving AC power. This LED will
flash when the SPK-200 senses a short or overload on the circuit. When the fault
is removed, the power supply will automatically reset and LED
11. Sidetone zero-adjusting
The SPK-200 uses full-duplex audio (the same as a conventional telephone line) in
which the talk and listen audio are sent and received on the same line. Thus,
when you talk on a channel, you will also hear your own voice back in the speaker
or headphones. This is called sidetone. If you are using the SPK-200 with a
microphone and speaker, sidetone could cause unwanted feedback, since the

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microphone may pick up your returned voice audio and reamplify it. This could
also happen if you are using a headset where the ear cushions do not completely
cover the ears, although it is probably much less likely. In either case, you should
minimize the amount of sidetone.
Typically, different sidetone null settings are needed depending upon whether you
are using the gooseneck panel microphone along with the speaker or not. Use one
of the following procedures to correctly set the sidetone level controls.
A) Sidetone Adjustment Procedure for Gooseneck Microphone with
Speaker turned on:
1 Turn on the Mic switch. Set Mic select switch to panel.
2 Turn the level control to a comfortable level.
3 Speak into the microphone while turning the sidetone null control slowly back
and forth. There should be a point where your voice (and any accompanying
acoustic feedback) is the lowest. This is the null point.
B) Sidetone Adjustment Procedure for Headset:
1 Turn on the Mic switch. Set Mic select switch to headset.
2 Turn the level control to a comfortable level by having someone talk to you from
another station.
3 Speak into the microphone while turning the sidetone null control slowly back
and forth. There should be a point where your voice (and any accompanying
acoustic feedback) is the lowest. This is the null point.
C) System Sidetone Adjustment
1 Turn off all the microphones on sub-stations and beltpacks.
2 Followed by A) and B), adjust sidetone on MS-800 main station.
3 Turn on the microphone on sub-station and beltpacks one by one, and then
adjust the Sidetone to satisfied level.
12. Remote Mic Kill Switch (RMK)
The Remote Mic Kill (RMK) switch will turn off the microphone of every beltpack
remotely. If the Talk Functions of a large number of beltpacks have inadvertently
been left activated, incidental noise and talking can make it difficult or impossible

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to communicate with the intercom system. The Remote Mic Kill switch can be
pressed to quiet the line in this situation.
Notice: if any beltpack microphone within intercom line can be turned off in
remote way, each powered working station within this intercom system must be
interconnected via online interface on its rear panel.
13. Listen Level Control
Turn this control to set the listen level of received audio signal within
communication system. It adjusts listen level of headset and speaker. Turn the
control completely counterclockwise to silence the channel.
14. Speaker Switch
The Speaker Switch turns the front panel speaker on or off.
When the front panel speaker is turned on, pressing Mic button will reduce the
speaker output level about 6dB and helps minimize feedback.
15. Channel Switch
Channel switch is used to select the communication channel.
Rear Panel
16. Intercom Line connector
3-pin XLR female socket, eight interfaces corresponding to eight channels; the
pinout of the intercom connectors is as follows:
Pin 1 --- Common (Shield)

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Pin 2 --- Power (+24 VDC)
Pin 3 --- Audio
17. Termination switch
This switch provides switchable termination for system. In most systems,
termination should be in the ON position. The fundamental concept of Party-Line
intercom is that all the channels are terminated in one location, preferably at a
main station. For example, the termination switch on main station should be set to
the ON position, and termination switches on other sub stations should be set to
the OFF position.
When termination switch is set to the ON position, one 220 ohm termination
resistor is connected to intercom line. If intercom system is not terminated, the
level of intercom line will become high, and the system stability will be influenced.
However, only one termination point is allowed within same intercom line. If
multiple termination points are used incorrectly, the driving load will be overloaded,
and the level of intercom line will become low.
Before using, you should set termination switch to the ON or OFF position
according to the actual connection of intercom line.
NOTE: All intercom lines must be terminated only once, whether they
are used or not. Never "double-terminate" a line.
18. Online Connector on Channel A
It is used for Online connection among TELIKOU working main stations.
The pinout of Online Connector is as follows:
Pin 1 --- Common (Shield)
Pin 2 --- Control Signal
Pin 3 --- Audio Signal
Notes: Connect To Switch (19) must be set correctly before using. Otherwise the
system will not work properly.
Notice:
1. This connector only can be connected to TELIKOU main station. It is not
allowed to be connected with Intercom Line Connector (Intercom Line);
otherwise, the system will not work properly.

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2. When connecting those non-TELIKOU main stations to TELIKOU main
station, must use Intercom Line Connector.
19 Connect To Switch with Channel A
To achieve Mic on the beltpacks can be turned off by RMK function. All the
TELIKOU main stations in the system must be connected by the Online connector
which is on the rear panel. And Connect To switch turns to ‘ONLINE’ position.
Otherwise, RMK switch can not function on those beltpacks which are connected
to Channel A.
If SPK-200 must be connected to Intercom Line on Channel A, Connect To switch
need turns to ‘INTERCOM LINE’ position. Otherwise SPK-200 can not work
properly. And RMK switch can not affect belt packs on Channel A.
20. Online Connector on Channel B
It is used for Online connection among TELIKOU working main stations.
The pinout of Online Connector is as follows:
Pin 1 --- Common (Shield)
Pin 2 --- Control Signal
Pin 3 --- Audio Signal
Notes: Connect To Switch (21) must be set correctly before use. Otherwise the
system will not work properly.
Notice:
1. This connector only can be connected to TELIKOU main station. It is not
allowed to be connected with Intercom Line Connector (Intercom Line);
otherwise, the system will not work properly.
2. When connecting those non-TELIKOU main stations to TELIKOU main
station, must use Intercom Line Connector.
21 Connect To Switch with Channel B
To achieve Mic on the beltpacks can be turned off by RMK function. All the
TELIKOU main stations in the system must be connected by the Online connector
which is on the rear panel. And Connect To switch turns to ‘ONLINE’ position.
Otherwise, RMK switch can not function on those beltpacks which are connected

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to Channel B.
If SPK-200 must be connected to Intercom Line on Channel B, Connect To switch
need turns to ‘INTERCOM LINE’ position. Otherwise SPK-200 can not work
properly. And RMK switch can not affect belt packs on Channel B.
22. AC Power Connection
Voltages from 90 to 240 VAC at 50 or 60Hz is acceptable. The power consumption
is less than 45VA.
IV. Installation and cable
1. Installation
SPK-200 main workstation is 273mm wide, 88.5mm high and 215mm deep. And
this workstation can be mounted on rack or placed on desktop. If it is placed on
desktop, it is required to adhere 4 rubber foot pads provided with machine to four
corners at the bottom of cabinet with double-face adhesive tape.
2. Intercom cable
A). Rules for cable selection
TELIKOU intercom system adopts double-core shielded audio cable, one core is
used for transmitting audio signal, another core is used for transmitting DC power
or control signal, and the shielded layer is used as common line for audio and
power supply. To decrease resistance of common line and crosstalk interference,
the cable with larger cross section area should be used. When it is used in fixed
way, the cross section area of single line should be at least 1.5mm2, when it is
used in mobile mode, the cross section area of single line should be at least
0.75mm2. When the cable is longer, the cross section area of cable should be
larger. If the cable has more than 2 cores, it is recommended to use the additional
core as common line.
B). Cable connection
The standard TELIKOU intercom cable is connected with a pair of 3-pin XLR
connectors, one male and one female. If longer cable is required, you can connect
several cables together with head-end method.

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The wiring of connector is as follows:
Pin 1 --- Common (Shield)
Pin 2 --- Power or Control Signal
Pin 3 --- Audio Signal
Notice: the pin-1 GND connection for each XLR connector must be insulated from
cabinet, and cannot be connected to shell of XLR connector.
V. Troubleshooting
Problem: Power LED wink
Cause 1: Direct short on the intercom channel
Solution 1: Remove all the intercom cables from SPK-200. Check each channel one
by one until find the short channel.
Cause 2: Overload
Solution 2: Decrease the amount of remote stations.
Problem: System feedback (Acoustical)
Cause 1: Listen level control at this station or a remote station is set too high.
Solution 1: Adjust.
Cause 2: Sidetone null control at this station or a remote station is not adjusted
correctly
Solution 2: Adjust. Refer to the procedure in the Front Panel section of this
manual.
Cause 3: Channel unterminated.
Solution 3: Set the SPK-200 termination switch to the ON position.
Cause 4: A headset cord is too long or jointing quality.
Solution 4: Check headset cord
Problem: Excessive crosstalk
Cause 1: High DC resistance in ground return.

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Solution 1: Use heavier cable; add additional conductor(s) to ground return.
Cause 2: Headset cables are not wired properly or shielded properly.
Solution 2: Correct wiring. Use headsets with properly shielded wiring.
Problem: Hum or buzz in system
Cause 1: Be earth-free or imperfect earth.
Solution 1: Check the plug, and make sure it is perfect earth.
Cause2: Inductive pickup caused by close proximity of this main station or
connected remote stations to power lines or transformers.
Solution2: Relocate the offending unit.
Cause 3: Intercom line cable is not wired properly; the shield of microphone cable
is not connected to Pin-1 of 3-XLR
Solution 3: Check intercom line cable. Make sure all the cables’ Pin-1 of 3-XLR
connects correctly.
Cause4: 10 Ohm chassis ground resistor is open.
Solution 4: Bridge a 10 Ohm resistor between the common port of direct current
output of power supply and earth terminal (crust).
If this condition occurs, it is because the system ground came into
contact with something that was "HOT" with respect to the power
supply earth ground. Carefully check the system ground and AC
distribution in the area.
WARNING: THIS IS A POTENTIALLY DANGEROUS SITUATION. A SHOCK
HAZARD MAY EXIST BETWEEN A REMOTE STATION HEADSET AND
GROUND.
Problem: Can not turn on the Mic function on all the beltpacks
Cause: The connection among TELIKOU main stations better go via Online
connector on rear panel. The Online connector connected on this station connects

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to the Intercom Line connector on another station. But Connect To switch set to
‘ONLINE’ position.
Solution 1: Reconnect by Online to Online.
Solution 2: Set Connect To switch of working channel to ‘INTERCOM LINE’ position.
(Especially SPK-200 connects to no TELIKOU main station)
Problem: Can not turn off the Mic function on all the beltpacks after
pressing RMK button
Cause 1: The connection among TELIKOU mains stations must go via Online
connector. If main stations are connected by Intercom Line connector, RMK
function will not work properly.
Solution 1: Check the connection among main stations. Please use Online
connector, and switch 'Connect To' to Online positon.
Cause 2: TELIKOU main stations are connected with Online connector. But
Connect To switch is set to ‘INTERCOM LINE’ position.
Solution 2: Check Connect To switch, set it to the proper position.
Cause 3: Some main stations are not TELIKOU. So these main stations do not
have Online connector. The connections among these main stations are with
Intercom Line connector.
Solution 3: Change to TELIKOU main station.
Problem: The volume of front panel speaker is too weak
Cause: When the front panel speaker is turned on, pressing Mic button will reduce
the speaker output level about 6dB and help minimize feedback
Solution: Turn off the Mic button after each speaking.
VI. Technical Specification
PRE-AMP:
Microphone impedance: Dynamic 200ohm
Gain form Mic to intercom line: +49dB
Bandwidth: 40Hz-8000Hz ± 2dB
POSTPOSITION-AMP:
Load impedance: 50-2000ohm
Output level: +17dBv
Distortion: <0.1% (1000Hz)
Gain from line to output: +31dB
BANDWIDTH:
200Hz-800Hz ± 2dB
SIDETONE:

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Adjustable range: -40dB, 32dB
EARPHONE:
Dynamic 50-2000 ohm
MICROPHONE:
Dynamic 100-600 ohm
CONNECTOR:
Panel Mic connector: ø6.35mm/XLR-3F
Pin 1 -- Mic common
Pin 2 -- Mic hot
Pin 3 -- parallel connected with Pin 2 internal
Headset connector: XLR-5F
Pin 1--Mic common
Pin 2--Mic hot
Pin 3--headphone common
Pin 4--headphone hot
Pin 5—Null
Intercom cable connector: XLR-3F
Pin 1 --- Common (Shield)
Pin 2 --- Power (+24 VDC)
Pin 3 --- Audio
Online Connector: XLR-3F
Pin 1 --- Common (Shield)
Pin 2 --- Control Signal
Pin 3 --- Audio Signal
POWER SUPPLY:
AC 90-260V, 50-60Hz, <45VA
Output voltage: 24V DC,
ENVIRONMENTAL:
0° - 70°C（32°-158°F）
DIMENSION:
10.75” (W) x3.48” (H) x8.46” (D), 273mm x 88.5mm x 215mm
WEIGHT:
2.6kg
Notice
While TELIKOU makes every attempt to change its product manuals, the

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information is subject to change without notice.