21
E-200 SERIES INTERCOM SYSTEM — EF-200 DUAL CHANNEL MASTER STATION
Remove the links corresponding to the output transformer LK9
and LK10.
Place the output transformer, keeping in mind the position of
their pins (seven behind and six forward), and solder it to the main
PCB.
OPENING THE INTERCOM LINE TERMINAL IMPEDANCE
The intercom lines should have a terminal impedance to
make the different units connected to them work correctly,
however only one can connect a terminal impedance for line
becouse if they are connected two in parallel, the impedance
would diminish in a half; for this and in order to connect other
units with a terminal impedance, it is possible to open the
terminal impedance placed at the master station (NOTE: Keep
in mind that with all the units of the ALTAIR E-200 intercom
system of ALTAIR it is not necessary to open the terminal impedance).
In order to open the intercom line terminal impedance the EF-200 provide some jumpers (JP1
for the line B and JP2 for the line A) placed at the right part of the main PCB, near the front panel
looking at the unit from the front panel. With the jumper placed, the terminal impedance will be
connected and with the jumper removed, it will be open.
CAUTION:
Never leave the intercom line without terminal impedance, becouse a bad operation of
the units connected to the line would take place.
CHANGING THE MIC GAIN
The microphone preamplifier gain can be configured with an internal DIP-SWITCH (DSW1,
position 1, MIC GAIN, placed at the front left corner of the main PCB of the unit) in 30 or 40 dB. With
the position 1 of the DIP-SWITCH in OFF (downwards, looking at the unit from the front panel) the
gain of the microphone preamplifier is 30 dB, and with the position 1 of the DIP-SWITCH in ON
(upwards, looking at the unit from the front panel) the gain is 40 dB (factory set-up).
MICROPHONE PREAMPLIFIER
MICROPHONE PREAMPLIFIER
GAIN SET UP TO 30 dB.
GAIN SET UP TO 40 dB.
PA OUTPUT CONFIGURATION
The PA-MIC switch allows to enable the PA OUTPUT placed at the rear panel, which normally
is disabled, and to carry out the microphone sending picked up in the HEADSET connection to other
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