have a problem when testing Rx sensitivity on GE865 using the CMU200 call
tester. I am controlling the CMU200 using CMUgo to do full sensitivity
sweep across GSM 900 band. sometimes during the test the GE856 module goes into
a strange mode where it is allocated(i.e in a call) I can read all Tx
parameters such as power, phase noise, freq error etc. however, the CMU200 cannot
manage to read BER. even if I manually pause the test and wind up the received
power. I still cannot read BER and I get a message on the CMU saying ”Unable
to close the loop, check SIM card”. I tried to disconnect the call and re-connect and still not able to get BER reading. The only option to get it working is to power cycly the module.
I tried the same SIM card with the same
CMU200 and CMUgo on a mobile phone and it never shows this error.
Could you please give us some solutions?
RF Design Engineer
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