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TX burst sychronization unstable in GSM

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Wilson_yu_chen

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tx burst

Hi

I found for high channel range of frequency bands, easily the burst
cannot be synchronized, and shows some time full power as 33dBm (PCL=5)
or burst time shifting as very low power.

Could it be possible due to the crystal coarse tuning range ? or any other
causes ? I also found my freqeuncy error sometime peaks high, and high temperature not power on. But it's wierd to me that last version PCB didn't get
this problem, and this version coming with better layout clearance but fails.

I use Locosto platform, therefore not much monitor pin accessible to check
lock status....

Please comment or give clues.


Thanks!!
 

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