– 4–7 –
4.3.6. TX-Freq Compensation
1. Select the test band mode (step
Q
).
2. Enter the fixed ARFCN refer to SF column, click
[APPLY] tab (step
W
).
8
Set tester in the same channel
3. Enter Scaling Factor (step
E
), PL 5 value is the
reference, click [APPLY] tab. Other PL no need to
check.
8
Read the TX output power value on the tester.
8
Compare with the actual specification.
8
The best highest Scaling factor is not more than
60,000.
4. Repeat until the best factor according to the ideal
output power value is viewed on the tester and
enter that value in the corresponding grid cell (SF)
(step
R
).
5. Repeat steps 1 to 4 for other channels and bands,
Click [WRITE] tab (step
T
) if all bands are
completed.
4.3.7. RX-Power Scaling Factors (1)
1. Click RX TEST tab (step
Q
).
2. Click [READ] tab (step
W
) to get the default values
of each band (step
E
).
Note: There are 2 parts on this TEST.
■
RX Calibration.
■
RX Frequency Compensation
Set Tester to:
<a> Operating Mode: Test
<b> Test Function: CW
<c> RF Gen Power: -60 ddm
<d> Ms TX Level: 5
4.3.8. RX-Power Scaling Factors (2)
1. Select the test band mode (step
Q
).
2. Enter the middle ARFCN (step
W
) of each band
(ex: EGSM–37)
Tester Setting:
<a> RF Gen Band: EGSM
<b> RF Gen Freq: 942.4 + 0.0677 = 942.4677 MHz
3. Click [SEND] tab (step
E
) and RSSI & OFFSET
value will show.
8
The RSSI value should be "–900" or
approximately "–1100".
4. Click [OFFSET] tab (step
R
) to apply the offset
value.
5. Repeat steps 1 to 4 for all bands (use Mid-channel
only).
6. Click [WRITE] tab (step
T
) when the all bands are
completed.
