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RH-6

Company Confidential

7 - RF Description & Troubleshooting

CCS Technical Documentation

Page 26

2003 Nokia Corporation.

Issue 1 10/2003

Company Confidential

GSM1900 TX troubleshooting

Setup for GSM1900 TX troubleshooting

Start the investigations as described in chapter General instructions for TX troubleshoot-
ing “General instructions for TX troubleshooting”.

Set operating mode to local mode.

Select

Maintenance Testing

RF Controls

Wait until the RF Controls window pops up

Select

Band

GSM 1900

Active unit

Operation mode

Burst

RX/TX Channel

661

TX PA Mode

Free

TX Power Level

TX Data Type

Random

The setup should now look like this:

Now the measurement equipment should measure the following output signal from the
phone.

out

= +20dBm @ 1880MHz

If this is not the case, then go to the next chapter for fault finding.

Fault finding chart for GSM1900 transmitter

It is useful to use TXP signal as a trigger-signal. It is provided at TXP test point.

Содержание RH-6 Series

Страница 2: ...troubleshooting 13 Transmitter Description and Troubleshooting 19 TX signal paths 19 General instructions for TX troubleshooting 20 EGSM900 TX troubleshooting 21 GSM1800 TX troubleshooting 24 GSM1900 TX troubleshooting 26 Synthesizer Description and Troubleshooting 28 26 MHz Reference Oscillator VCXO 28 VCO 28 General instructions for synthesizer troubleshooting 29 Check synthesizer operation 30 F...

Страница 3: ...of the transmitter are done with a power meter which is connected to the antenna port using the repair jig MJ 7 Always make sure that the measurement set up is calibrated when measuring RF param eters at the antenna port Remember to include the correct losses of the module repair jig as stated on MJ 7 and the connecting cable when realigning the phone Most RF semiconductors are static discharge se...

Страница 4: ... 1 RF key components placement Position Component Name Supplier and Description Code N801 TX PA Hitachi PF8109BN TB aluminium substrate 4350409 L801 Directional Coupler Murata LDC15D190A0010A 4551015 Z601 Antenna Switch Module Hitachi Metals SHS L090 4510385 Z602 SAW1800 RX Epcos B7714 4511313 Z603 SAW1900 RX Murata SX B195F 4511325 Z604 SAW900 RX Epcos B7710 4511279 Z701 SAW900 TX Epcos B7715 451...

Страница 5: ... 10 2003 Copyright 2003 Nokia Corporation Page 5 Company Confidential RF measurement points The RF power supplies are generated in the UEM and can be measured either in the Mjoelner chamber or in the baseband chamber The pictures below indicate with red cir cles where the test points are located ...

Страница 6: ...ter test points INMM INPM INMH INPH INML INPL also LNAbase_voltage s Rx Test Points RXIINN J612 RXIINP J611 RXQINN J614 RXQINP J613 VR4 VR6 Rx GSM RX PCS RX DCS Antenna Feed CONT2 VANTH CONT3 VANTL CONT1 VANTM TXIOUTP TXIOUTN VR5 TXQOUTN TXQOUTP Tx Test Points Antenna Feed CONT2 VANTH CONT3 VANTL CONT1 VANTM VBD DET Pout EGSM Pout DCS PCS TX_900 VTXB_900 TX_1800 VBAT_RF TXC TXP VREF1 VR3 VR2 ...

Страница 7: ...on 7 RF Description Troubleshooting Company Confidential RH 6 Issue 1 10 2003 Copyright 2003 Nokia Corporation Page 7 Company Confidential Synthesizer test points PLL Test Points VR3 VREF1 VIO VCOout UTUNE VR7 RFCLK_I VR5 VR1A ...

Страница 8: ...L and LNAs for all used bands A DC control section is included in to power and or control EGSM TX buffer detector and antenna switch The Mjoelner RF ASIC is controlled via a serial bus Mjoelner RF ASIC contains an integrated VCXO which uses an external 26 MHz Xtal No analogue AFC signal is needed AFC is done via the serial interface of Mjoelner The 26 MHz reference clock is interfaced to the UPP T...

Страница 9: ...S Technical Documentation 7 RF Description Troubleshooting Company Confidential RH 6 Issue 1 10 2003 Copyright 2003 Nokia Corporation Page 9 Company Confidential RF block diagram Figure 6 RF block diagram ...

Страница 10: ... all currents can be measured directly Spots for measuring of voltages are indicated in the above test points sections Figure 7 RF Power distribution diagram VR1A 4 75 V 3 2 charge pump VDDCP 0 45 mA 85 mA Tx modulator VDDTX 2 78 V 3 3 5 mA 2 78 V 3 VCXO VDDXO BB buffer VDDBBB 14 mA Tx900 28 Rx 2 78 V 3 VR4 VR3 VR2 41 mA PLL prescaler VDDPRE 2 78 V 3 VR5 PLL counters VDDPLL dividers LO buffers VDD...

Страница 11: ...s routed to the GSM1800 SAW filter Z602 From RX3 PCS output the RX GSM1900 signal is routed to the GSM1900 SAW filter Z603 The antenna switch with routed lines has following typical insertion losses 1 3dB EGSM900 1 6dB GSM1800 and 1 6dB GSM1900 RX front end The RX front end includes three SAW filters EGSM900 Z604 GSM1800 Z602 GSM1900 Z603 Each of the SAW filters is matched with a differential matc...

Страница 12: ... in the BB chain For that no external circuitry is required Baseband amplifiers BBAMP1 These amplifiers implement the initial channel filtering Low pass filters LPF1 DC compensation AGC amplifiers DCN1 These implement gain steps from 0dB to 24dB in 6dB steps Attenuators AGC These implement gain steps from 48dB to 0dB in 6dB steps yielding a total gain range of 72dB together with DCN1 Bi quad filte...

Страница 13: ...tware and open FBUS connection RX Fault finding T Apply 80dBm signal from Generator to Antenna Connector phone local burst mode Rx chain functional RX calibration Yes No EGSM PCS PCN RSSI reading 80dBm all bands Yes No Calibrtion witin limits Yes No EGSM PCS PCN SNR measurement all bands o k Apply 92dBm signal from Generator to Antenna Connector phone local burst mode RSSI and SNR wrong in all 3 b...

Страница 14: ...rols F Wait until the RF Controls window pops up Select Band GSM 900 or GMS1800 or GSM1900 Active unit RX Operation modeBurst RX TX Channel 37 or 700 or 661 Select Maintenance Alt M Testing T RSSI reading R The setup should now look like this Apply a signal with a frequency of EGSM 942 46771 MHz channel 37 67 710kHz offset GSM1800 1842 86771 MHz channel 700 67 710kHz offset GSM1900 1960 06771 MHz ...

Страница 15: ... SNR measurement Start Phoenix Service Software and open FBUS connection Select Scan Product Ctrl R Wait until phone information is shown in the lower right corner of the screen Set operating mode to local mode Select Maintenance Alt M Testing T RF Controls F Wait until the RF Controls window pops up Select Band GSM 900 or GMS1800 or GSM1900 Active unit RX Operation mode Burst RX TX Channel 37 or ...

Страница 16: ...ould now look like this Choose respective band EGSM900 GSM1800 GSM1900 Press measure A window pops up e g for EGSM900 band Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses Press ok and the window closes Read the SNR result SNR should be EGM900 20dB GSM1800 18dB GSM1900 18dB ...

Страница 17: ... Controls window pops up Select Band GSM 900 or GMS1800 or GSM1900 Active unit RX Operation mode Continuous RX TX Channel 37 or 700 or 661 Please refer to the fault finding chart for proper levels at different test points Measuring analogue RX I Q signals using oscilloscope Measuring with an oscilloscope on RXIINN or RXQINN is recommended only if RSSI reading does not provide enough information Th...

Страница 18: ...ion Troubleshooting CCS Technical Documentation Page 18 Copyright 2003 Nokia Corporation Issue 1 10 2003 Company Confidential Following picture should be seen on a working EGSM receiver Signal amplitude 1 25V DC offset 1 35V Frequency 67kHz ...

Страница 19: ...and signals one for EGSM900 and one common for GSM1800 GSM1900 The baseband signal is modulated with the LO signal corresponding to the wanted TX channel The GSM TX output of the Mjoelner RF ASIC is a balanced signal From the output of the Mjoelner RF ASIC the signal is fed through the EGSM TX SAW filter balanced to single ended a 3dB pad and the 900 MHz buffer to the EGSM input of the power ampli...

Страница 20: ... app 33dBm The sup ply is coming directly from the battery terminals The output is controlled by the power control loop From the output of the PA the signal goes through the directional coupler one of the power control loop components to the antenna switch Antenna switch TX RX switch The antenna Switch works as a diplexer for the RX and TX signals Moreover it sup presses the TX harmonics generated...

Страница 21: ...w the instructions as given below EGSM900 TX troubleshooting General instructions for EGSM900 TX troubleshooting Start the investigations as described in section General Instructions for TX Trouble shooting Set operating mode to local mode Select Maintenance Testing RF Controls Wait until the RF Controls window pops up Select Band GSM 900 Active unit TX Operation mode Burst RX TX Channel 37 TX PA ...

Страница 22: ...as trigger signal For that a TXP test point is provided Use Phoenix to select TX_Data Type 1 or 0 TX Power Level 10 Yes Oscilloscope R612 C627 C717 C623 C605 VREF01 VR2 TXP VR5 VR3 Vdc 1 35 Volt Vdc 2 78 Volt V 1 8 Volt Vdc 2 78 Volt Vdc 2 78 Volt No Check baseband Yes Oscilloscope C715 C715 TXIOUTP TXIOUTN 67kHz Vac 0 4 Vpp Vdc 1 1 V 67kHz Vac 0 4 Vpp Vdc 1 1 V No Check C716 C716 TXQOUTP TXQOUTN ...

Страница 23: ...P 3 dBm 897 4 MHz Compare with good sample No Check EGSM TX SAW Filter Mjoelner Yes Synthesizer Use Phoenix to select TX_Data Type Random TX Power Level 10 Yes Spectrum analyzer Check PA N801 L801 B1_in PA N801 Pout_GSM No Check Power Loop L801 V801 Power 25 dBm 897 4 MHz Check TXC Yes Spectrum analyzer RF connector Pout 23 dBm 897 4 MHz Check No Directional Coupler L801 Antenna Switch Z601 Yes EG...

Страница 24: ...ng mode to local mode Select Maintenance Testing RF Controls Wait until the RF Controls window pops up Select Band GSM 1800 Active unit TX Operation mode Burst RX TX Channel 700 TX PA Mode Free TX Power Level 5 TX Data Type Random The setup should now look like this Now the measurement equipment should measure the following output signal from the phone Pout 20dBm 1747 8MHz If this is not the case ...

Страница 25: ...7kHz Vac 0 4 Vpp Vdc 1 1 V 67kHz Vac 0 4 Vpp Vdc 1 1 V 67kHz Vac 0 4 Vpp Vdc 1 1 V No Check Base Band Yes Oscilloscope C702 C701 C703 C803 CONT1 CONT2 CONT3 VBD Vdc 2 78 Volt Vdc 0 Volt Vdc 0 Volt Vdc 2 78 Volt No Check Mjoelner Serial Interface Mjoelner Yes Spectrum analyzer R819 in TX_1800 P 3 dBm 1747 8 MHz No Check DCS Balun T701 Mjoelner Yes Synthesizer Use Phoenix to select TX_Data Type Rand...

Страница 26: ...rating mode to local mode Select Maintenance Testing RF Controls Wait until the RF Controls window pops up Select Band GSM 1900 Active unit TX Operation mode Burst RX TX Channel 661 TX PA Mode Free TX Power Level 5 TX Data Type Random The setup should now look like this Now the measurement equipment should measure the following output signal from the phone Pout 20dBm 1880MHz If this is not the cas...

Страница 27: ... 67kHz Vac 0 4 Vpp Vdc 1 1 V 67kHz Vac 0 4 Vpp Vdc 1 1 V 67kHz Vac 0 4 Vpp Vdc 1 1 V No Check baseband Yes Oscilloscope C702 C701 C703 C803 CONT1 CONT2 CONT3 VBD Vdc 2 78 Volt Vdc 0 Volt Vdc 0 Volt Vdc 2 78 Volt No Check Mjoelner Serial Interface Mjoelner Yes Spectrum analyzer R819 in TX_1800 P 3 dBm 1880 MHz No Check DCS PCS Balun T701 Mjoelner Synthesizer Yes Use Phoenix to select TX_Data Type R...

Страница 28: ... enough Therefore a VCXO calibration value is written via the serial Bus into the RefOSCCAL register of Mjoelner and an additional bit in the RefOSCCntl register of the Mjoelner That is necessary for the rough calibration of the VCXO The VCXO is fine tuned by programming the AFC value via the serial bus of Mjoelner The necessary AFC value is written into the RefOSCAFC register in Mjoelner VCO The ...

Страница 29: ...DPLL VDDXO V R E F 1 VDDDL VDDDIG VDDBBB VBB 1 8V 2 7k Vcp supply filter S E N S E RESETX INPLO INMLO PA vendor indication Rpa Ref filter 3 RFBUSX RFBUSDA RFBUSCLK Synth supply filter Ref clk set VR5 VR3 RFCONV_0 9 VIO V C O S E N S E VR2 VIO SELADDR GENIO6 VCXO supply filter VR7 LPR CLK buffer VCO supply filter VR1A 5V 64 65 NDIV ADIV ϕ Charge Pump RDIV 1 2 1 4 1 2 1 4 1 2 Buffer LOCNT REFCNT Loc...

Страница 30: ... phone information is shown in the lower right corner of the screen Set operating mode to local mode Start RF Control window Select Maintenance Alt M Tuning T RF Controls F Wait until the RF Controls window pops up Set the synthesizer to the following mode Select Band GSM 900 Active unit RX Operation mode Continuous RX TX Channel 37 The setup should now look like this The frequency of 3769 6MHz at...

Страница 31: ...z Utune 2 3 2 8V PLL Block is functional Yes Oscilloscope VCXO output R425 RFCLK 26MHz app 0 8Vpp No Oscilloscope VCXO Supply C607 VR3 2 78V VIO 1 8V VREF1 1 35V Yes PLL Synthesiser Fault finding Tree No Check supply filter components Check BB and Software Phone not in function check R618 C425 B601 Mjoelner No Oscilloscope VCO supply VR7 2 78V VR5 2 78V VR1A 4 7V Yes Phone not in function No Spect...

Страница 32: ... 89 907 8 952 8 3631 2 3811 2 1002 885 6 930 6 3542 4 3722 4 28 895 6 940 6 3582 4 3762 4 90 908 0 953 0 3632 0 3812 0 1003 885 8 930 8 3543 2 3723 2 29 895 8 940 8 3583 2 3763 2 91 908 2 953 2 3632 8 3812 8 1004 886 0 931 0 3544 0 3724 0 30 896 0 941 0 3584 0 3764 0 92 908 4 953 4 3633 6 3813 6 1005 886 2 931 2 3544 8 3724 8 31 896 2 941 2 3584 8 3764 8 93 908 6 953 6 3634 4 3814 4 1006 886 4 931...

Страница 33: ... 3740 8 557 1719 2 1814 2 6876 8 7256 8 651 1738 0 1833 0 3476 0 3666 0 745 1756 8 1851 8 3513 6 3703 6 839 1775 6 1870 6 3551 2 3741 2 558 1719 4 1814 4 6877 6 7257 6 652 1738 2 1833 2 3476 4 3666 4 746 1757 0 1852 0 3514 0 3704 0 840 1775 8 1870 8 3551 6 3741 6 559 1719 6 1814 6 6878 4 7258 4 653 1738 4 1833 4 3476 8 3666 8 747 1757 2 1852 2 3514 4 3704 4 841 1776 0 1871 0 3552 0 3742 0 560 1719...

Страница 34: ...96 0 1976 0 3792 0 3952 0 554 1858 6 1938 6 3717 2 3877 2 648 1877 4 1957 4 3754 8 3914 8 742 1896 2 1976 2 3792 4 3952 4 555 1858 8 1938 8 3717 6 3877 6 649 1877 6 1957 6 3755 2 3915 2 743 1896 4 1976 4 3792 8 3952 8 556 1859 0 1939 0 3718 0 3878 0 650 1877 8 1957 8 3755 6 3915 6 744 1896 6 1976 6 3793 2 3953 2 557 1859 2 1939 2 3718 4 3878 4 651 1878 0 1958 0 3756 0 3916 0 745 1896 8 1976 8 3793...

Страница 35: ...e TX Power Level Tuning If changes around the modulator RF path from UEM via Mjoelner to RF PA have been done TX IQ Tuning is additionally required In general repairs in the RX part or the PLL part always require RX Calibration and RX Band Filter Calibration If Mjoelner is changed all calibrations have to be done Other parts interfacing to TX RX or PLL might require tuning but common sense should ...

Страница 36: ...efficients Slope C1 3 during VCXO calibration One AFC slope value is not sufficient for Mjoelner because the AFC slope is non linear in this chip The AGC calibration finds the gain values of the RX chain The AGC consists of RF LNA which can be either on or off gain difference between on and off state is nominally 30dB and BB gain which can be controlled in 6dB steps This gives 15 gain steps RSSI0 ...

Страница 37: ...ue 1 10 2003 Copyright 2003 Nokia Corporation Page 37 Company Confidential The setup should now look like this Select Automatic press Start and a new window pops up Select PM settings press OK and the window closes Now it is possible to press the Calibrate button in the RX Calibration window ...

Страница 38: ...d a window pops up Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses If a radio communica tion tester CMD55 CMU200 8960 MT8801 is used be sure to have it running in continuous mode and with modulation switched off Press OK and the window closes A typical result will look like this ...

Страница 39: ... too Press Stop in the RX Calibration window and a new window pops up Press Yes and the EGSM RX Calibration is finished RX calibration GSM1800 Set operating mode to local mode Select Maintenance Alt M Tuning T RX Calibration C Wait until the RX Calibration window pops up Select Band GSM 1800 Autom 60 1st Man 50 2nd Man 85 Value Typical Limit min Limit max VCXO cal 568 128 767 AFC value 3150 3062 3...

Страница 40: ...e 40 Copyright 2003 Nokia Corporation Issue 1 10 2003 Company Confidential The setup should now look like this Select Automatic press Start and a new window pops up Select PM settings press OK and the window closes Now it is possible to press the calibrate button in the RX Calibration window ...

Страница 41: ...d a window pops up Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses If a radio communica tion tester CMD55 CMU200 8960 MT8801 is used be sure to have it running in continuous mode and with modulation switched off Press ok and the window closes A typical result will look like this ...

Страница 42: ...re within the limits all other Rssi values are valid too Press Stop in the RX Calibration window and a new window pops up Press Yes and the GSM1800 RX Calibration is finished RX calibration GSM1900 Set operating mode to local mode Select Maintenance Alt M Tuning T RX Calibration C Wait until the RX Calibration window pops up Select Band GSM 1900 Autom 60 1st Man 50 2nd Man 85 Value Typical Limit m...

Страница 43: ...ue 1 10 2003 Copyright 2003 Nokia Corporation Page 43 Company Confidential The setup should now look like this Select Automatic press Start and a new window pops up Select PM settings press OK and the window closes Now it is possible to press the calibrate button in the RX Calibration window ...

Страница 44: ...d a window pops up Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses If a radio communica tion tester CMD55 CMU200 8960 MT8801 is used be sure to have it running in continuous mode and with modulation switched off Press ok and the window closes A typical result will look like this ...

Страница 45: ...d the GSM1900 RX Calibration is finished RX band filter response compensation This alignment is necessary to compensate the frequency response of the RX band filters SAW filters RX band filter response EGSM900 Set operating mode to local mode Select Maintenance Alt M Tuning T RF Controls F Wait until the RF Controls window pops up Select Band GSM 900 Select Maintenance Alt M Tuning T RX Band Filte...

Страница 46: ... like this Select Input Signal Level 60 Manual tuning Press Manual tuning and a window pops up Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses If a radio communica tion tester CMD55 CMU200 8960 MT8801 is used be sure to have it running in continuous mode and with modulation switched off ...

Страница 47: ...RX Band Filter Response Compensation is finished Auto tuning A faster and more convenient method for Band Filter Calibration can be performed by clicking on Auto Tuning This requires a Signal Generator that can be programmed to step through a user defined list of frequencies Program the signal generator to the list of frequencies that are visible in the column Input Frequency MHz Press Auto tuning...

Страница 48: ... other filter frequencies please have a look to Appendix A where all FLALI test cases are listed together with the limits RX band filter response GSM1800 Set operating mode to local mode Select Maintenance Alt M Tuning T RF Controls F Wait until the RF Controls window pops up Select Band GSM 1800 Select Maintenance Alt M Tuning T RX Band Filter B Response Compensation The following window pops up ...

Страница 49: ... like this Select Input Signal Level 60 Manual tuning Press Manual tuning and a window pops up Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses If a radio communica tion tester CMD55 CMU200 8960 MT8801 is used be sure to have it running in continuous mode and with modulation switched off ...

Страница 50: ...Filter Response Compensation is finished Auto tuning A faster and more convenient method for Band Filter Calibration can be performed by clicking on Auto Tuning This requires a signal Generator that can be programmed to seep a user defined list of frequencies Program the signal generator to the list of frequencies that are visible in the column Input Frequency MHz Press Auto tuning and a window po...

Страница 51: ...ther filter frequencies please have a look to Appendix A where all FLALI test cases are listed together with the limits RX band filter response GSM1900 Set operating mode to local mode Select Maintenance Alt M Tuning T RF Controls F Wait until the RF Controls window pops up Select Band GSM 1900 Select Maintenance Alt M Tuning T RX Band Filter B Response Compensation A window pops up Select Yes and...

Страница 52: ... like this Select Input Signal Level 60 Manual tuning Press Manual tuning and a window pops up Connect an external signal generator to the RF connector of the phone and set the gen erator as told in the window taking care for external cable losses If a radio communica tion tester CMD55 CMU200 8960 MT8801 is used be sure to have it running in continuous mode and with modulation switched off ...

Страница 53: ... RX Band Filter Response Compensation is finished Auto tuning A faster and more convenient method for Band Filter Calibration can be performed by clicking on Auto Tuning This requires a signal Generator that can be programmed to seep a user defined list of frequencies Program the signal generator to the list of frequencies that are visible in the column Input Frequency MHz Press Auto tuning and a ...

Страница 54: ... a look to Appendix A where all FLALI test cases are listed together with the limits RX channel select filter calibration This calibration is calibrating the Baseband filter inside Mjoelner It is done by internally measuring a prototype filter for this reason the calibration is done once not separately in 3 bands Set operating mode to local mode Select Maintenance Alt M Tuning T RX Channel Select ...

Страница 55: ...ould now look like this Press Autotune and the optimal values are found Press Stop and a new window pops up Press Yes and the RX Channel Select Filter Calibration is finished Limits for the GTR value Filter adjustment value decimal format RX AM suppression not needed The RH 6 RFIC Mjoelner does not require tuning of AM suppression Value Typical Limit min Limit max GTR 34 28 40 ...

Страница 56: ...e of power meter in GSM testers is likely to cause larger error than the use of a dedicated power meter and might cause the phone to be non compliant with GSM spec ifications Set power supply voltage Vcc 3 6V TX Power level tuning EGSM900 Set operating mode to local mode Select Maintenance Tuning TX Power Level Tuning Wait until the TX Power Level Tuning window pops up Connect a calibrated power m...

Страница 57: ...oenix mentioned target power levels Make sure that the output power for Power Level 5 is equal or lower than 1dB below the saturation output power Determine the saturation power by setting the DAC Value to its maximum For example If the saturation output power is only 33 3dBm then adjust the DAC Value for Power Level 5 to 32 3dBm Press calculate check if all levels match the target values correct ...

Страница 58: ...ory Press Yes and the EGSM TX Power Level Tuning is finished TX power level tuning GSM1800 Set operating mode to local mode Select Maintenance Tuning TX Power Level Tuning Wait until the TX Power Level Tuning window pops up Connect a calibrated power meter to the RF connector of the phone Select Band GSM 1800 Active Unit TX Press Start and a window pops up Select Permanent memory press OK and the ...

Страница 59: ...l 0 30 dBm 11 8 dBm and 15 0 dBm The Power levels may differ from in Phoenix mentioned target power levels Make sure that the output power for Power Level 0 is equal or lower than 1dB below the saturation output power Determine the saturation power by setting the DAC Value to its maximum For example If the saturation output power is only 30 7dBm then adjust the DAC Value for Power Level 0 to 29 7d...

Страница 60: ...y Press Yes and the GSM1800 TX Power Level Tuning is finished TX power level tuning GSM1900 Set operating mode to local mode Select Maintenance Tuning TX Power Level Tuning Wait until the TX Power Level Tuning window pops up Connect a calibrated power meter to the RF connector of the phone Select Band GSM 1900 Active Unit TX Press Start and a window pops up Select Permanent memory press OK and the...

Страница 61: ...l 0 30 dBm 11 8 dBm and 15 0 dBm The Power levels may differ from in Phoenix mentioned target power levels Make sure that the output power for Power Level 0 is equal or lower than 1dB below the saturation output power Determine the saturation power by setting the DAC Value to its maximum For example If the saturation output power is only 30 7dBm then adjust the DAC Value for Power Level 0 to 29 7d...

Страница 62: ...gh that the input of the analyzer can t be destroyed Adjust the ref erence level offset according to the insertion loss from the phone to the spectrum analyzer Note During TX I Q Tuning in EGSM900 band an additional calibration value for the battery voltage A D converter is taken Therefore it is important to set the operating volt age for this alignment to 3 6V PC Phone operation Set operating mod...

Страница 63: ...0 Active UnitTX Operation ModeBurst RX TX Channel 37 TX PA ModeFree TX Data Type All1 Select in the TX IQ tuning window Select Load from Product Press Start Select again in the RF Controls Window Select TX Power Level 9 EGSM EGSM900 Center Frequency 897 4 MHz Frequency Span 300 kHz Resolution Bandwidth 3kHz Video Bandwidth 3kHz Sweep Time 3 sec Sweep Type Clear Write Detector Type Max Peak Referen...

Страница 64: ...se the variables TX I DC offset and TX Q DC offset to adjust the carrier signal to a minimum level marker 2 Tuning is possible by using arrow keys on the keyboard Push ing the sliders by using the mouse is less sensitive but even possible Ref Lvl 35 dBm Ref Lvl 35 dBm RBW 3 kHz VBW 3 kHz SWT 3 s RF Att 30 dB 30 kHz Center 897 4 MHz Span 300 kHz 27 5 dB Offset A 1MA Unit dBm 60 50 40 30 20 10 0 10 ...

Страница 65: ... to a minimum level Marker 3 Tuning is possible by using the arrow keys on the key board Pushing the sliders by using the mouse is less sensitive but even possible After tuning to the minimum the level difference between marker 3 and the peak level at marker 1 must exceed 40dB Ref Lvl 35 dBm Ref Lvl 35 dBm RBW 3 kHz VBW 3 kHz SWT 3 s RF Att 30 dB 30 kHz Center 897 4 MHz Span 300 kHz 27 5 dB Offset...

Страница 66: ...you use a spectrum analyzer make sure that the external attenuation 20 30dB between phone and spectrum analyzer is high enough that the input of the analyzer can t be destroyed Adjust the ref erence level offset according to the insertion loss from the phone to the spectrum analyzer PC Phone operation Value Typical Limit min Limit max TX I DC offset 0 1 6 6 TX Q DC offset 0 6 6 Amplitude differenc...

Страница 67: ...e option Narrow Spectrum to the RF connector of the phone If a spectrum analyzer is used then use the following settings Select in the RF controls window Select Band GSM 1800 Active UnitTX Operation ModeBurst RX TX Channel 700 TX PA Mode Free TX Data Type All1 Select in the TX IQ Tuning Window Select Load from Product Press Start Select again in the RF Controls Window GSM1800 Center Frequency 1747...

Страница 68: ...uld now look like this The Spectrum Analyzer now shows a plot like this Ref Lvl 35 dBm Ref Lvl 35 dBm RBW 3 kHz VBW 3 kHz SWT 3 s RF Att 30 dB 30 kHz Center 1 7478 GHz Span 300 kHz 27 5 dB Offset A 1MA Unit dBm 60 50 40 30 20 10 0 10 20 30 65 35 1 2 3 Marker 3 T1 10 57 dBm 1 74786771 GHz 3 T1 10 57 dBm 1 74786771 GHz 1 T1 24 34 dBm 1 74773229 GHz 2 T1 2 92 dBm 1 74780000 GHz Date 15 JAN 2002 10 18...

Страница 69: ... and the peak levels at marker 1 must exceed 40dB The Spectrum Analyzer now shows a plot like this Use the variables Amplitude difference and Phase difference to adjust the 67kHz sig nal to a minimum level Marker 3 Tuning is possible by using the arrow keys on the key board Pushing the sliders by using the mouse is less sensitive but even possible After tuning to the minimum the level difference b...

Страница 70: ...n the case you use a spectrum analyzer make sure that the external attenuation 20 30dB between phone and spectrum analyzer is high enough that the input of the analyzer can t be destroyed Adjust the ref erence level offset according to the insertion loss from the phone to the spectrum analyzer Value Typical Limit min Limit max TX I DC offset 0 1 6 6 TX Q DC offset 0 1 6 6 Amplitude difference 0 1 ...

Страница 71: ...m Analyzer or GSM tester with the option Narrow Spectrum to the RF connector of the phone If a spectrum analyzer is used then use the following settings Select in the RF controls window Select Band GSM 1900 Active UnitTX Operation ModeBurst RX TX Channel 661 TX PA ModeFree TX Data TypeAll1 Select in the TX IQ tuning window Select Load from Product Press Start GSM1900 Center Frequency 1880MHz Frequ...

Страница 72: ...Level 4 The setup should now look like this The Spectrum Analyzer now shows a plot like this Ref Lvl 35 dBm Ref Lvl 35 dBm RBW 3 kHz VBW 3 kHz SWT 3 s RF Att 30 dB 30 kHz Center 1 88 GHz Span 300 kHz 27 5 dB Offset A 1MA Unit dBm 60 50 40 30 20 10 0 10 20 30 65 35 1 2 3 Marker 3 T1 12 20 dBm 1 88006771 GHz 3 T1 12 20 dBm 1 88006771 GHz 1 T1 27 81 dBm 1 87993229 GHz 2 T1 4 13 dBm 1 88000000 GHz Dat...

Страница 73: ...2 and the peak levels at marker 1 must exceed 40dB The Spectrum Analyzer now shows a plot like this Use the variables Amplitude difference and Phase difference to adjust the 67kHz sig nal to a minimum level Marker 3 Tuning is possible by using the arrow keys on the key board Pushing the sliders by using the mouse is less sensitive but even possible After tuning to the minimum the level difference ...

Страница 74: ... IQ Tuning is now finished Note The optimum values for TX I and Q Offset and Amplitude and Phase Differ ence vary from phone to phone Value Typical Limit min Limit max TX I DC offset 0 2 6 6 TX Q DC offset 0 1 6 6 Amplitude difference 0 1 1 Phase difference 89 0 80 100 Ref Lvl 35 dBm Ref Lvl 35 dBm RBW 3 kHz VBW 3 kHz SWT 3 s RF Att 30 dB 30 kHz Center 1 88 GHz Span 300 kHz 27 5 dB Offset A 1MA Un...

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