Tune up Procedure

FCC ID: ZFT-K105

Parts List/Tune Up Info

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FCCID_1453243

Tune UP

GPIB Cable
RF Tester

PC
RF Cable

UART Cable
Test sample

Figure 1

1 Adjustment of RF Output Power:

(1) The equipment setup as shown in Figure 1.

(2) Operation of PC adjusts equipment.

(3) Use RF Engineering Tools at PC side.

Select GSM850 Band:

1) Set GSM850 Band.

2) Set ARFCN: 190

3) TX ON.

4) Adjust the power to 32.4dBm (Power control level: PCL=5) by PA DAC value.

5) Repeat 4) for 15 times,and adjust the power level to 30.5, 28.8, 27, 25, 23, 21, 19, 17, 15,

13, 11, 9, 7, 5.

6) Make 16 Ramp-Up/Ramp-Down data from the adjustment value of (5) and (6).

7) Data of 5) and 6) is writen to flash memory.

Select PCS1900 Band:

1) Set PCS Band.

2) Set ARFCN: 661.

3) TX ON.

4) Adjust the power to 29.0 dBm (Power control level: PCL=0) by PA DAC value.

5) Repeat 4) for 15 times,and adjust the power level to 27.5, 26, 24, 22, 20, 18, 16, 14, 12,

10, 8, 6, 4, 2, 0.

6) Make 16 Ramp-Up/Ramp-Down data from the adjustment value of (5) and (6).

7) Data of 5) and 6) is writen to flash memory.

2 Adjustment of oscillation frequency of VCXO:

(1) The equipment setup as shown in Figure 1.

(2) Use Crystal AFC Control Tools to Set CapID and AFC DAC value.

(3) Set Band=GSM850,Set ARFCN=190,Set PCL=12.

1) Set AFC DAC=4096,fixed.(Check that Vafc=1.4V).

2) Set CapID=0, and verify that frequency error >>10KHz.

3) Set CapID=63, and verify that frequency error <<-10KHz.

4) If the above 3 items are verified, then change CapID value to make frequency error be

closed to 0 Hz as possible, record this CapID value.

5) Set CapID value got from step 4), then change AFC DAC value to make frequency error

be closed to 0 Hz as possible, record this AFC DAC value.

6) Download the CapID value and AFC DAC value to flash memory.

3 Adjustment of RX Sensitivity:

(1) Select GSM850 Band:

1) Set BCCH level:-85dBm;ARFCN:128.

2) Test sample make a call to connect RF Tester..

3) Set TCH level:-106dBm.

4) Measure BERⅡ error at TCH ARFCN:128, 190，251.

5) Tuen up the RX matching cricuit to make sure BERⅡ<2% at each ARFCN.

(2) Select PCS Band:

1) Set BCCH level:-85dBm;ARFCN:512.

2) Test sample make a call to connect RF Tester..

3) Set TCH level:-106dBm.

4) Measure BERⅡ error at TCH ARFCN:512, 661, 810.

5) Tuen up the RX matching cricuit to make sure BERⅡ<2% at each ARFCN.

Document Created: 2011-01-28 12:44:59
Document Modified: 2011-01-28 12:44:59

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