Hi Matt Additional to below: I tried to resume normal testing with A as Rx and D as Tx. Now, it seems I have an offset of about 2 MHz using internal clocks and running usrp2_fft.py on A, when I transmit a BPSK signal from D. Moreover, I am unable to tune D for the low (2.4 GHz) band anymore. In fact, when I just tried again I don't even seem to be able to detect any received signal even in the high band, and even though it appears to lock on D.
Regards Ian. Hi Matt I have completed the probing as you suggested. The results are in the following table. Please note that the voltages did not seem to be stable when I tried reprobing in some cases. An example of this is for R45, where I give two sets of results for Combo D. Also, please note the following expanded definitions for comments in the table. Triangle = The wave looked more like a triangular wave, never really settling on a fixed high or low level. Square50 = The wave looked approximately square, with equal time in low/high states. Square33 = The wave looked approximately square, with approx. 1/3 time in the high state, and 2/3 time in the low state. Results for probing R45: Combo | U2# | XCVR# | Set freq? | Vh (mV) | Vlow (mV) | f (MHz) | Comment ------------------------------------------------------------------------ --- A | 933 | 990 | YES | 16 | -12.8 | 100 | Triangle B | 933 | 988 | NO | 19.6 | -16 | 100.184 | Triangle C | 1159 | 990 | YES | 20.8 | -19.2 | 100 | Triangle D(1st)| 1159 | 988 | YES | 21.2 | -20 | 100.125 | Triangle D(2nd)| 1159 | 988 | YES | 12 | -15.6 | 99.83(?)| Triangle Results for probing R56: Combo | U2# | XCVR# | Set freq? | Vh (mV) | Vlow (mV) | f (MHz) | Comment ------------------------------------------------------------------------ --- A | 933 | 990 | YES | 16 | -7.6 | 33.3 | Square33 B | 933 | 988 | NO | 15.2 | -6 | 33.3 | Square33 C | 1159 | 990 | YES | 15.2 | -6.8 | 33.3 | Square33 D | 1159 | 988 | YES | 12 | -11.6 | 49.969 | Square50 I guess, the difference in the R56 for case D (the only case for which XCVR 988 was able to set the frequency) may shed some light??? Anyway, hopefully from these results you will be able to determine which card is suspected to have the problem. Thanks Ian. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
