Variable Split Band Inverter
10
MX214/224
Amplitude
Pre-emphasis
(Additional)
MX214
De-emphasis Pre-emphasis Tx
Rx
MX214
De-emphasis
(Fitted)
Control
Flat Amplitude
Channel
300-3400Hz
Frequency
Inverter
(Additional)
(Fitted)
Frequency
Inverter
(Optional)
Figure 5: Recommended Basic Radio Communication Audio System Layout.
During the Transmit function the low pass and CTCSS filters are configured automatically as shown in Figure
6, with cut-off frequencies (-3dB) indicated.
CK3
C5
FC2
CK3
CK4
CKB
FILTER 4
FILTER 3
3400Hz
2700Hz
CLEAR
SCRAMBLE
3400Hz
3400Hz
Tx OUT
Tx IN
PS
Σ
CTCSS
300Hz
2900Hz
2900Hz
SCRAMBLE
CLEAR
2600Hz
2600Hz
CLEAR
PS + ENABLE Tx
BIAS
FILTER 1
CKA
FILTER 2
CKA
BIAS
SCRAMBLE
BIAS
C6
FC1
Figure 6: Basic Tx Path
During the Receive function the Low Pass and CTCSS filters are configured automatically as shown in Figure
7, with cut-off frequencies (-3dB) indicated.
CK3
C5
FC2
CK4
CKB
CK4
FILTER 3
FILTER 4
3400Hz
3400Hz
CLEAR
SCRAMBLE
3400Hz
2700Hz
Rx OUT
Rx IN
PS
CTCSS
300Hz
Σ
2600Hz
2600Hz
SCRAMBLE
CLEAR
2900Hz
2900Hz
PS + ENABLE Tx
CLEAR
Rx MUTE
FILTER 2
CKA
FILTER 1
CKA
BIAS
BIAS BIAS
BIAS
SCRAMBLE
C6
FC1
Figure 7: Basic Rx Path
ꢀ1998 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480112.002
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CMLMICRO [ CML MICROCIRCUITS ]
