gsm 900 sensitivity
Thanks for your replies
Yeah, my handset have three frequency bands(GSM900,DCS1800,PCS1900).Of course,the GSM900 works under the EGSM900.
In Conducted Sensitivity Mode(Test Port direct to the instrument), the sensitivity are all good(880 Mhz to 915Mhz of Tx Band).
But in Radiated Sensitivity Mode(put into the chamber), the 1 to 10 Channels are specially bad(about -95 dB). others are all normal.
DCS and PCS are also normal.
RF TRx of the handset is single chip but PA circuit. And it is two displays,but in the test,we have eliminated them.
So, I guess the circuit should be no problem. The problem may be EMI?
But I don't know where it is.
Thanks for your kind discuss.
Best Regards