Axel Gsm Audio Interface User manual
Linker
Gsm Audio Interface
Operative Manual
AXEL TECHNOLOGY srl
Via Caduti Di Sabbiuno 6/F · 40011 Anzola Emilia · Bologna · Italy
Phone: +39 051 736555 · + 39 051 736154 · Fax: +39 051 736170
There are some situations where the radio reporter needs to transmit urgently his own
service on live but not fix phone lines nor satellite links are available.
Interface), the new equipment enables linking to the studio by GSM telephone net with a
By Linker equipment is possible to send your own radio service speedily and from each side
in the world where it's available a GSM telephone net.
This little equipment, needful in any equipped vehicle for external audio and video shot,
telephone receiver and able to convert the full duplex GSM telephone signal into a
common 4 wire conference circuit to be connected to the audio console.
One of the Linker greatest qualities is that it enables to speak by using a professional
microphone and to listen the return directly from a loudspeaker without any noise or larsen
enables to make interviews without providing any earphone to the interviewee.
Linker has got a GSM dual band module inside, which functions are controlled by the
keyboard and by the LCD display situated on the front panel while on the back panel is
situated the antenna connector (FME male).
Linker is inserted into a screened metal box ( 1 RU high and 1/3 RU 19” wided).
On the back is situated a connector to use the GSM module internal modem that will be
activated on the future versions.
Linker can interface with each kind of microphones, earphones and headphones.
Features:
—GSM Dual Band module integrated
—Power Supply: 12 volts
—
—
—Front input: Microphone on the XLR female connector at 3 poly
—Microphone input impedance: 10 Ohms
—Frequency range: 250 3500 Hz (limited by mobile phone filter)
—Microphone Level regulation by click commutator at 10 dB step from 0 to 50 dB plus
—Peak and modulation level indicator by 2 led
—Front output: jack for stereophonic headphone.
—Headphone output Impedance: 8 ohms
—Headphone output level setting
—Front keyboard to select operations of inside GSM DB telephone module.
—
—Female D connector at 9 pin not operative, for the future connection among internal
DESCRIPTION
Linker - Gsm Audio Interface Operation Manual
In order to avoid to such a situation, Axel Technology has manufactured the Linker (GSM Audio
high audio quality.
allows also to use the GSM telephone net as a normal fix telephone line by a common BCA
effects thanks to an integrated circuit DSP control (Digital Signal Processor), and this one
1A Back Protection Fusible
Larsen effect absence, echo and diaphone thanks to DSP integrated.
fine regulation by potentiometer.
LINE INPUT/OUTPUT at zero Db by female D connector at 9 pin.
modem and computer.
11
22
1- Back panel
2- Gsm Module
3- Keyboard
4- I/O Audio
Analytic Diagram
Linker - Gsm Audio Interface Operation Manual
SIM CARD READER
Introduction
1) Linker interface contemplate a Sim card use arranged for Pin Code request (Personal
Identification Number) at each equipment activation.
2)Sim card insert has to be made before any other operation.
For this operation is needed to:
a)Remove the 6 fixing screws of top panel.
b)Remove the top panel
c)Remove the little mobile panel situated under the GSM module (as in the analytic picture as
below).
Linker - Gsm Audio Interface Operation Manual
Linker Gsm Audio Interface
Linker is provided with an inside SIM CARD reader .
d)To raise the box blocking it and insert again the little mobile panel.
e)To screw the top panel with its 6 screws.
It's a flip-up model stuck into an horizontal position and accessible by a little mobile
panel as shown in the picture.
Connections
AC/DC
220V - 12V
AC/DC
220V - 12V
MIXER
AUDIO
MIXER
AUDIO
Rs232 (Optional)
Telephone cable
Antenna 900-1800 Mhz
Locate the antenna above
ground and as close to windows
(or exterior walls) as possible
Audio pinout
Audio Out + 2
Audio Out - 6
Audio In + 9
Audio In - 5
Linker - Gsm Audio Interface Operation Manual
Linker Gsm Audio Interface
How to make a call
front.
How to answer a phone call
Microphone and headphone level setting
and then select the GAIN level up to get the normal voice level and the led
Peak is on.
When the led is on, please turn the Mic level handle to get the best setting.
GSM antenna level
GSM Operator signal
When it's possible to reach the connection among the GSM net and its SIM
Before calling please verify that the Linker is connected to a mobile net
When Linker is receiving an external call it sends a ring to the phone linked to
Linker - Gsm Audio Interface Operation Manual
To make a call it's possible using either the keyboard on the front panel or the
telephone linked to a phone connector.
checking that the front display shows the inserted sim operator name.
With the front keyboard, dial the number and the pick up the receiver
Pressing the proper key (please look at analytic picture above about the key n.
1 of the keyboard).
It's so possible to talk by earphone and microphone, both of them linked by the
At the end of conversation is possible hang up the phone by pushing again the
receiver key.
the connector PHONE, and then send out as a beeper sound inside, so
showing the calling number on the front display.
It's possible to answer from the front panel by pressing the receiver key (look at
key n.1 on the analytic picture) and in this case the conversation takes place by
the headphone and the microphone linked in front. At the end of conversation,
push the key receiver again to hang up. Or it's possible to answer by the phone
linked to a Phone connector and in this case the conversation takes place by
phone receiver. At the end of conversation please hang up the receiver.
To set microphone and headphone level please turn on the Headphone level
handle, in order to get the best audio level.
To set the microphone level please turn the Mic level on the central position
The Mod Led indicates that it's possible to listen a good audio modulation.
The front display indicates the receiver signal level by its little marks.
Please place the antenna outside in order to get the best level.
