Motorola MSF 5000 Instruction Manual page 58

Chapter 1
Description
MSF
5000
Instruction Manual
The squelch detector attenuates the audio
signal and any generated harmonics.
A
noise detector produces an average
DC
voltage proportional
to the received
signal strength.
A
weak
and noisy signal produces
a
low
average
DC
voltage.
A
strong and quieted signal produces a higher average
DC
voltage.
The squelch switching circuit
operates
in two
modes:
slow
or immediate squelch
closing.
A
slow squelch closing
occurs
when
a
signal is received just above
opening sensitivity.
An
immediate squelch closing occurs when
a
strong signal is
received.
The receiver squelch circuitry produces two
separate outputs: RX1 UNSQ and
CHANNEL ACT.
The
repeater squelch circuitry produces
the
RPTR UNSQ signal.
The signals
are
routed to the control and logic circuitry.
1-20
68P81092E02 3/19/94
Chapter 1
Description
MSF
5000
Instruction Manual
The squelch detector attenuates the audio
signal and any generated harmonics.
A
noise detector produces an average
DC
voltage proportional
to the received
signal strength.
A
weak
and noisy signal produces
a
low
average
DC
voltage.
A
strong and quieted signal produces a higher average
DC
voltage.
The squelch switching circuit
operates
in two
modes:
slow
or immediate squelch
closing.
A
slow squelch closing
occurs
when
a
signal is received just above
opening sensitivity.
An
immediate squelch closing occurs when
a
strong signal is
received.
The receiver squelch circuitry produces two
separate outputs: RX1 UNSQ and
CHANNEL ACT.
The
repeater squelch circuitry produces
the
RPTR UNSQ signal.
The signals
are
routed to the control and logic circuitry.
1-20
68P81092E02 3/19/94