MX214 Просмотр технического описания (PDF) - MX-COM Inc

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MX214

Variable Split Band Inverter

MX-COM Inc  

Variable Split Band Inverter

9

MX214/224

5. Application

The MX214 represents both the MX214 and the MX224 throughout this section.

Recommended external components are shown in Figure 2 and Figure 3. In ‘Scramble’ mode, split point

frequencies are selected and set in accordance with the ROM address code present at the inputs A0-A4. See

Table 4. In ‘Clear’ mode, both upper and Lowerband filter limits are used (see Figure 6 and Figure 7), the

carrier frequencies are turned off, and the balanced modulators are bypassed internally. The Lowband audio

is removed from the output signal prior to summing.

ROM

Address

A4-A0

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

Split Point

Hz

2800

2625

2470

2333

2210

2100

2000

1909

1826

1750

1680

1555

1448

1354

1272

1200

Low Band

Carrier, Hz

fC1

3105

2923

2777

2631

2512

2403

2304

2212

2127

2049

1984

1858

1748

1655

1572

1501

High Band

Carrier, Hz

fC2

6172

6024

5813

5681

5555

5494

5376

5263

5208

5102

5050

4950

4807

4716

4629

4587

ROM

Address

A4-A0

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

Split Point

Hz

1135

1050

976

913

857

792

736

688

636

591

552

512

471

428

388

350

Table 4: ROM Address Programming

Low Band

Carrier, Hz

fC1

1436

1351

1278

1213

1157

1094

1037

988

936

891

853

813

772

728

688

650

High Band

Carrier, Hz

fC2

4504

4424

4347

4310

4273

4166

4132

4065

4032

3968

3937

3906

3846

3816

3787

3731

The MUTE function disables the MX214/224’s audio outputs to allow periodic transmission of synchronization

data. A logic ‘0’ at this input isolates the device while leaving the audio input and output ins at bias level (See

Table 2). When the MX21/224 is in Powersave mode, audio signals may be hardwired around the device

since the input and output pins are open circuit. See Table 2.

5.1 Audio Quality

Figure 4 shows the recommended basic audio system layout using pre- and de-emphasis circuitry to maintain

good recovered speech quality. The Transmit mode, Do Not pre-emphasize the audio output of the MX214.

In the Receive mode, de-emphasis should be used after the MX214.

Amplitude

Control Pre-emphasis

MX214

(Optional)

Frequency

Inverter

Tx

Rx

Flat Amplitude

Channel

300-3400Hz

MX214

Amplitude

De-emphasis

Control

Frequency

Inverter

(Optional)

Figure 4: Recommended Basic Communication Audio System Layout

Figure 5 shows the recommended basic audio system layout if it is necessary to install the MX214 within a

radio having pre- and de-emphasis circuitry as a standard. This is where post-emphasis access is not

possible in the transmitter.

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

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