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SONY SPP930
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY SPP930 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 13 (click to view)
2.1.3

RX, TX Bandpass Filters The RX and TX bandpass filters provide two functions. The first is to effectively pass the correct frequencies to the RX and TX sections of the RF module. It is important especially for the RX section that these filters have a low insertion loss in order to ensure a low front end noise figure. These filters are also designed to provide >25 dB rejection for the opposite band. This means that the transmit carrier will be attenuated by at least 25dB before entering the receive section of the phone. A plot of the low band filter is shown below.

902-905MHz Passband

0dB

10dB/div

815

925-928MHz Reject Band

101

Figure 2 Low band Ceramic filer response. ––––––––––––––––––––––––––––––––––––– For this filter the insertion loss is less than 3dB at 902 to 905MHz while the 925-928MHZ band has >25dB attenuation. This filter is used for the RX filter in the handset or the TX filter in the base. The high band filter characteristic is shown below. This filter is used for the handset TX filter and base RX filter.

925-928MHz Passband

0dB

10dB/div

815

902-905MHz Reject Band

101

Figure 3. Hight band ceramic filter Response. ––––––––––––––––––––––––––––––––––––––––

– 13 –

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