BASE UNIT
HANDSET
Channel No
Transmit Frequency
Receive Frequency
Transmit Frequency
Receive Frequency
1
1897.344
1897.344
1897.344
1897.344
2
1895.616
1895.616
1895.616
1895.616
3
1893.888
1893.888
1893.888
1893.888
4
1892.160
1892.160
1892.160
1892.160
5
1890.432
1890.432
1890.432
1890.432
6
1888.704
1888.704
1888.704
1888.704
7
1886.976
1886.976
1886.976
1886.976
8
1885.248
1885.248
1885.248
1885.248
9
1883.520
1883.520
1883.520
1883.520
10
1881.792
1881.792
1881.792
1881.792
Note:
Channel No. 10: In the Test Mode on Base Unit and Handset.
19. BLOCK DIAGRAM (BASE UNIT)
20. CIRCUIT OPERATION (BASE UNIT)
20.1. Outline
Base Unit consists of the following ICs as shown in
BLOCK DIAGRAM (BASE UNIT)
().
- DECT BBIC (Base Band IC): IC6
- Handling all the audio, signal and data processing needed in a
DECT base unit
- Controlling the DECT specific physical layer and radio section (B
urst Module Controller section)
- ADPCM codec filter for speech encoding and speech decoding
(DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP
section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- All interfaces (ex: RF module, EEPROM, LED, Analog Front End,
etc.)
- RF Module: IC9
- PLL Oscillator
55
www.freeservicemanuals.info
1/2/2015
Digitized in Heiloo, Holland
Содержание KX-A142EXM
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Страница 114: ...PbF R1 R2 TP4 TP1 TP2 TP3 Digital Volt Meter 12Ω 2W A www freeservicemanuals info 1 2 2015 Digitized in Heiloo Holland ...