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TDMA StarTAC
TM
P8190
:
TX Offset Oscillator
Not Used
Description
The offset oscillator frequency is controlled by U110(ZIF/SYN) via TXCP_OUT. The operating frequency will depend on the dc biasing of CR300. The offset oscillator fre-
quency is 157.32MHz in analog mode, and 112.32MHz in digital mode. The LP_Switch, which comes from U110 pin 40, changes the offset frequency. The LP_Switch is
on in analog mode and off digital mode. The LP-Switch is currently not supported in the TDMA StarTAC, therefore, the frequency of the offset oscillator will be
157.32MHz regardless of whether it is in analog or digital mode.
In analog mode the FM signal comes from U1800(DCI) pin 39 and is modulated directly in the offset oscillator. The offset oscillator with the FM then enters U300(QMOD).
The Quadmod(U300) will feed back the offset frequency to U110 for proper PLL operation.
A
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Summary of Contents for Timeport P8190
Page 1: ...DIGITAL WIRELESS TELEPHONE Model P8190 TDMA 800MHz Analog 800MHz Service Manual Level III ...
Page 3: ......
Page 28: ... 2000 Motorola Inc TDMA Timeport P8190 Cellular Overview 16 ...
Page 36: ...24 TDMA Timeport P8190 Accessories 2000 Motorola Inc ...
Page 44: ...Motorola Confidential Proprietary TDMA Timeport P8190 TDMA Test Mode NAM Programming 32 ...
Page 66: ...Motorola Confidential Proprietary TDMA Timeport P8190 Test Procedures 54 ...
Page 76: ...64 TDMA Timeport P8190 Disassembly Speaker Vibrator Removal Motorola Confidential Proprietary ...
Page 88: ...76 TDMA Timeport P8190 Parts List Motorola Confidential Proprietary ...