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Pip tone is the audio alert that a call has been received and is used to indicate to the
user that there is an incomming call.
The volume of this alert can be adjusted using this control.
K. LS dim Vol
LS (Loudspeaker) dim, is the amount of dimming that occurs on the front panel
loudspeaker when a talkback key is pressed. By dimming the loudspeaker when a
talkback channel is on you reduce the amount of acoustical pickup between the
loudspeaker and microphone which helps to eliminate nasty acoustical feedback.
L. End Stop Vol
The term ‘End stop’ refers to old fashioned electronic volume circuits where an ‘end
stop’ resistor would be placed at the bottom of a volume potentiometer to prevent
that potentiometer from fully attenuating (turning off) the audio signal.