Problem with USRPs (phase offset)?

Hi I used this configuration (2 receivers (USRPs) and 1 transmitter (generator of sin wave)):
I did time and phase synchronisation .
the problem:
The received signals by the 2 USRPs are not superposed !??
how can I do to supperpose the signals received by the two USRPs??
please help me
Best regards

first of all, thanks for your answer.
unfortunally i didn't understand it in total.
do you mean, it is NOT possible to use any timezone setting, which is not based on a "standrad one" ?
as far as i know, there are countries using daylight saving time periods, which are not fixed to the "same start- and endtime for every year" (like israel for example).
i thought i can handle this "problem" using the posix string method to set the TZ environement.
so, is it not possible to use this linux feature (to use the export TZ=XST-1XDT..... command) combined with java ????
thanks for your help again.
regards
alex

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