Variable Split Band Inverter

10

MX214/224

1998 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480112.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

Pre-emphasis

MX214

Tx

Rx

MX214

De-emphasis

Amplitude

Control

Frequency

Inverter

Frequency

Inverter

(Additional)

Flat Amplitude

Channel

300-3400Hz

(Optional)

(Fitted)

De-emphasis

(Additional)

Pre-emphasis

(Fitted)

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.

BIAS

PS

3400Hz

3400Hz

BIAS

PS + ENABLE Tx

⋅

SCRAMBLE

SCRAMBLE

CLEAR

FILTER 3

2700Hz

3400Hz

FILTER 4

2600Hz

2600Hz

SCRAMBLE

CLEAR

FILTER 2

2900Hz

2900Hz

FILTER 1

Tx IN

300Hz

CLEAR

BIAS

Tx OUT

CTCSS

Σ

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.

BIAS

Rx

⋅ MUTE

2700Hz

3400Hz

BIAS

PS + ENABLE Tx

⋅

SCRAMBLE

SCRAMBLE

CLEAR

FILTER 4

3400Hz

3400Hz

FILTER 3

2900Hz

2900Hz

SCRAMBLE

CLEAR

FILTER 1

2600Hz

2600Hz

FILTER 2

Rx IN

CLEAR

BIAS

Rx OUT

Σ

300Hz

CTCSS

BIAS

PS

Figure 7: Basic Rx Path