NLLW 50
– ‚User guide
6
1.3 Wiring contacts
1.3.1 Description of basic module
The NLLW is compact solution of communicator, it means that contains
loudspeaker, microphone, screw terminal and connector for PC connection
(configuration). At picture 1 is drawing of NLLW basic board (version A).
Functionality of connection is explain in follow chapters. On the basic board are
3 setting elements ( trimmers) :
MIC
– microphone volume setting
VOL
– loudspeaker volume setting
TRH
– setting of balance between micro and speaker
Note: Please take in mind during TRH setting that incoming direction ( speaker)
and outgoing direction ( microphone) are influence each other.
We recommend to dont set high volume in the begining of micro or speaker
and via
TRH
set both direction to be both in good volume quality.
Picture 1: NLLW basic board
For explanation: when signal into speaker approach certain level then
decreases micro volume to enter signal into speaker. At the other hand signal
from microphone decreases volume of speaker. By
TRH
trimmer you are
setting prefferention of microphone or speaker.
Here you can see that when is set high volume of microphone (
MIC
)
as same as speaker (
VOL
) then signals influence each other. The result might
be that call is interrupted or one direction is silent.
