CMX148 datasheet(21/75 Pages) CMLMICRO

21 / 75 page

PMR Audio and Data Processor

CMX148

D/148/6

AF Response - TX Mode

25kHz Channel Filter & 300Hz HPF

Soft Limiter

-90

-80

-70

-60

-50

-40

-30

-20

-10

100

1000

10000

100000

Frequency (Hz)

25kHz & HPF Enabled (C2H=0C00H)

25kHz ch Template (ETSI)

No Filters (C2H=0000H)

300Hz HPF (C2H=0400H)

-14 dB/octave

(-50 dB)

40kHz

Ref. 0dBV

RBW 10Hz

VBW 30Hz

Sweep Time: 160 secs

C1H 4002H

3kHz

+1dB/-3dB WRT ref.

6kHz

Figure 10 Tx Channel Audio Filter Response and Template (ETSI)

AF Response - TX Mode

12.5kHz Channel Filter & 300Hz HPF

Soft Limiter

-90

-80

-70

-60

-50

-40

-30

-20

-10

100

1000

10000

100000

Frequency (Hz)

12.5kHz & HPF Enabled (C2H=1400H)

25kHz ch Template (TIA/EIA)

12.5kHz ch Template (TIA/EIA)

No Filters (C2H=0000H)

12.5kHz only (C2H=1000H)

-60 dB/decade

(-50 dB)

20kHz

-100 dB/decade

(-82.5 dB)

Ref. 0dBV

RBW 10Hz

VBW 30Hz

Sweep Time: 160 secs

C1H 4002H

3kHz

+1dB/-3dB WRT ref.

Figure 11 Tx Channel Audio Filter Response and Template (TIA)

The characteristics of the 12.5kHz channel filter fit the template shown in Figure 10 and Figure 11. This

filter also facilitates implementation of systems compliant with TIA/EIA-603 ‘A’ , ‘B’ and ‘C’ bands .

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