Iqch gain calibration, 4 simple receiver test, 5 simple transmitter test – Panasonic EB-GD30 User Manual
Page 56
TEST AND MEASUREMENT
Issue 1
Section 6
MCUK991001C8
Revision 0
– 50 –
Service Manual
IQch Gain Calibration
1.
Set IQch gain to -0.25 dB.
a. On the Channel box press F6, and select TRIM OTHER.
b. Press move left arrow until IQCH GAIN field is highlighted. Press ENTER.
c. Enter 1 (for -0.25 dB) into the data field. Press ENTER.
2.
Measure the image leak ratio.
3.
If image leak ratio is greater than 30 dBc then unit is OK. (offset calibration is complete)
4.
If image leak ratio is less than 30 dBc then repeat steps 1, 2 and 3 above with IQch gain values: -0.50 dB (enter ‘2’), and
-0.75 dB (enter ‘3’).
5.
If image leak ratio is still less than 30 dBc then the unit is a fail.
6.5.4 Simple Receiver Test
The following procedure gives a method by which the Unit Under Test (UUT) can be placed into a condition allowing the service
technician to probe the entire receive RF path. Input level and frequency can also be specified.
To perform the following procedure the UUT must first be placed into Test Mode. Perform the following steps:
1.
At the Channel box highlight the CHG CH (GSM900 or GSM1800) field and set the required test channel. Press ENTER.
2.
Highlight the SET AGC 1,2,3 field and enter the required gain value.
3.
At the GSM test unit input an RF signal at the required frequency and level.
The unit has now been placed in a state which will allow the received signal path to be monitored.
6.5.5 Simple Transmitter Test
The following procedure gives a method by which the Unit Under Test (UUT) can be placed into a condition allowing the service
technician to probe the entire transmit RF path. Input level and frequency can also be specified.
To perform the following procedure the UUT must first be placed into Test Mode. Perform the following steps:
1.
At the Channel box highlight the CHG CH (GSM900 or GSM1800) field and set the required test channel.
2.
Press ENTER.
3.
Highlight the PL field and set the required test power level.
4.
Press ENTER.
5.
Highlight the TX_DATA field and select the required modulation type and data.
6.
Press ENTER.
The UUT is now in the required state to allow probing of the transmit RF path.