Motorola MSF 5000 Instruction Manual page 51

MSF
5000
Instruction Manual
Chapter
1 Description
SSCB
Functional Description
TO
EXPANSION BUS
FROM
co
AND LOGIC
LEVEL
Low Pass
DEEMPHASIS EXPANDOR
EEPOTS
1
AND
LoGic
EXPANSION BUS
AND AUDIO
AUDIO
GATE
FLUTTER FIGHTER CONTROL
pany
CONTROL
AND LOGIC
TP3
(
|
FLUTTER
|
FIGHTER
;
Jutt
QUAD AUDIO
TO ECURE
TONE
DECODE DATA
FILTER LIMITER
AND LOGIC
QUAD
1
AUDIO
'
TO EXPANSION BUS
RAW
QUAD
1
AUDIO
BUFFER
TO
RECEIVER
QUAD AUDIO
»
AND REPEATER
>
SQUELCH
CIRCUITS
MSFI068.
022294JNM
QUAD 2 AUDIO
AUDIO
BUFFER
RAW QUAD2
AUDIO
PUDPL ADJUST
FILTER
w
"TO
CONTROL
GATING
DIVERSITY
AUDIO
UCONNECT
TONE
TO CONTROL
RX1
AUDIO
LEGEND
-
900 MHz
only
Figure
1-5
Receive Audio Processing Circuitry
For
900
MHz
stations,
QUAD AUDIO is also routed to the flutter fighter circuit.
The flutter fighter circuit
attenuates receive audio during fading to eliminate
audio pops and weak or noisy signals
to
improve quality. The audio gate circuits
determine whether QUAD AUDIO
or
FLUTTER FIGHTER AUDIO
is being sent to
the next stage. ©
NOME
The flutter fighter circuitry is available only
in
900
MHz
stations.
68P81092E02 3/19/94
1-13
MSF
5000
Instruction Manual
Chapter
1 Description
SSCB
Functional Description
TO
EXPANSION BUS
FROM
co
AND LOGIC
LEVEL
Low Pass
DEEMPHASIS EXPANDOR
EEPOTS
1
AND
LoGic
EXPANSION BUS
AND AUDIO
AUDIO
GATE
FLUTTER FIGHTER CONTROL
pany
CONTROL
AND LOGIC
TP3
(
|
FLUTTER
|
FIGHTER
;
Jutt
QUAD AUDIO
TO ECURE
TONE
DECODE DATA
FILTER LIMITER
AND LOGIC
QUAD
1
AUDIO
'
TO EXPANSION BUS
RAW
QUAD
1
AUDIO
BUFFER
TO
RECEIVER
QUAD AUDIO
»
AND REPEATER
>
SQUELCH
CIRCUITS
MSFI068.
022294JNM
QUAD 2 AUDIO
AUDIO
BUFFER
RAW QUAD2
AUDIO
PUDPL ADJUST
FILTER
w
"TO
CONTROL
GATING
DIVERSITY
AUDIO
UCONNECT
TONE
TO CONTROL
RX1
AUDIO
LEGEND
-
900 MHz
only
Figure
1-5
Receive Audio Processing Circuitry
For
900
MHz
stations,
QUAD AUDIO is also routed to the flutter fighter circuit.
The flutter fighter circuit
attenuates receive audio during fading to eliminate
audio pops and weak or noisy signals
to
improve quality. The audio gate circuits
determine whether QUAD AUDIO
or
FLUTTER FIGHTER AUDIO
is being sent to
the next stage. ©
NOME
The flutter fighter circuitry is available only
in
900
MHz
stations.
68P81092E02 3/19/94
1-13