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Now downloading free:Motorola V2288

Download Motorola V2288 docs - Cell phone, GSM, Satellite phone - Nokia, Siemens, Samsung mobiles service manuals and repair information

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File name:gsm_phone__.part1.rar
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Size:2145 kB




Original Chassis:Level 3 (17/02/99)
Descr:Service Support e Schematic Diagram - (12.989Kb) Part 1/6 - pag 55
Group:Electronics > GSM >
Uploaded:2006-12-10 07:23:51
Multipart: 0  1  2  3  4  5

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V2288_gsm_.pdfV2288 Level 3 Circuit Description 17 / 02 / 99 V1.0 V2288 Circuit Description V2288 Level 3 Product Guide RF: Receive 1) The RF Signal from the base station is received through the Antenna A100 and is fed to J300, which is a purely mechanical switch which is operated when an cable is plugged into the Aux RF socket of the phone. This connects RF to the Aux RF port or the antenna. 2) The RX signal is then fed directly into U100 RF Switch, the switch acts as an isolation between TX and RX, this is controlled via the signals VA and VB which are previously created by TX_EN and RX_EN respectively through Q110. 3) Provided VB is high, then the received signal will be passed to the band pass filter FL470, where the selected frequency band (GSM 1800 or GSM900) will be filtered through, *Note. The front-end filter has a bandwidth that is capable of working with the American GSM standard 1900Mhz. This gives the option of creating a PCS unit without the need to change many components. 4) The a

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