Panasonic EB-GD30 Service Manual

Also see for EB-GD30: Operating instructions Technical guide

TEST AND MEASUREMENTMCUK991001C8 Section 6 Issue 1Service Manual – 49 – Revision 03. If the carrier leakage ratio is greater than 35 dBc then unit is OK. (offset calibration is complete).4. If not then repeat steps 1, 2 and 3 above for Qch offset values: 87, 67, 47, 27, 7.5. If the carrier leakage ratio is still less than 35 dBc then unit is a fail.Q Inc Calibration1. Set Qch offset to 167 (see Qch Check step 2).2. Measure carrier leakage ratio.3. If carrier leakage ratio is greater than 35 dBc then unit is OK. (offset calibration is complete).4. If carrier leakage ratio is less than 35 dBc then repeat steps 1, 2 and 3 above for Qch offset values:187, 207, 227, 247.5. If carrier leakage ratio is less than 35 dBc then unit is a fail.I, Qch GainIMPORTANT: I, Qch offset calibration should be done before this calibration.Spectrum Analyser Setup.centre frequency = 902.4 MHzRBW = 10 kHzVBW = 10 kHzspan = 1 MHzsweep time = 2 sec1. Set the Channel box controls to channel 62 at power level 5, normal burst modulated with all 1’s.a. Press the down arrow until CHANGE CH > is highlighted and then press ENTER.b. Press the down arrow until PL is highlighted. Press ENTER.c. Press the down arrow until TX DATA is highlighted. Press the move arrow until 1 appears in the highlighted field. PressENTER.2. Using the spectrum analyser measure the image leak ratio. Image leak ratio is the measured ratio of peak power and thepower at 135 kHz below peak frequency.Example:peak power (902.468 Mhz) = 33 dBmpower at 135 kHz below peak power = -9 dBmimage leak ratio = 33 dBm - (-9 dBm) = 42 dBmFigure 6.31: Image leak ratio3. 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 go to Ich gain calibration.