Problems while observing

sept 2001

This is an incomplete list of problems people have had while observing (actually it's a list of problems i've worked on and got around to documenting).

12dec05: 9 level wapp pulsar folding is doing the 9 level correction incorrectly.
17apr05 sband bistatic radar run had pointing problems.
31jan05: single Pol/channel setups for spectral line wapp observing only provides 1 polarization.
02aug04: ripples in lbw around 1390,1400 Mhz. seen a1861(may04), p1914(aug04)
17jul03 ri glitches in digitzer Q1 (caused by fifo read pulse)
04apr03 slow drifts in polB sbc1,polA sbc4 gain using the interim correlator (resolved 01jun03)
14mar03 jumps in interim correlator sbc 2 power levels (resolved 01jun03.. see 04apr03 problem)
25nov02 100Mhz frequency reference unlocks.
14jun02 cband. polarized Tsys vs azimuth angle.
may02 lbw FAA radar harmonics when radar not within digital filter bandpass.
26dec01 large ripple in 430Mhz dome receiver.
10sep01 A1459 lband narrow baseline instabilities/ripples. 1350-1420Mhz(new air conditioner).
ripple in lband wide polB.

09sep01 1375,1387,1400,1413 Mhz. Hybrid in and out. 17jul01 has ripple too.
01apr02 1665 Mhz hybrid out. ripple still there.
02may02 1405Mhz. Swap cables at output of dewar, ripple changes so ripple in dewar.
07may02 1405. Measure cal while tracking blank sky.

15sep01 Gain variation with temperature in cband,lbw,lbn.
12aug01 lbw tsys recovery time after dewar warmup.

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