Places to look for debug info:
19jun17: Dig I bs1g1 polA and polB have voltage rms's twice as large as expected.
24jan13: b4sXg0 FGPAx PI FIFO overflow
07oct12: bs1g0 FPGA1 dma overflow.
spectral jumps at 2^n channels (pfb underflows)
04oct10: cband receiver 4-6 ghz shows pshift=0x1555 gets rid of jumps (and no pfb overflows)
23apr10: if2 noise source. look at pshift=0x1ff5,0x0ff5 and adjpwr 30,45,120
Bit flips in high resolution mode (using digitial filter)
feb 12:Mock spectrometer fails with dump status timeout.; (ethernet problem)
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