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CICADAGreenBankSpectrometer2014Jul03
(2015-01-27,
RichardPrestage
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2013 July 03 - Testing for Ghost Frequency fix with new BOF
Goals
Ghost Frequency Tests #1
Blanking checks
Errors in blanking MR
Mode 1
Mode 2
Mode 10
Ghost frequency checks #2
Goals
Test modes 10-14 with new BOF which should have ghost frequency fix.
If time, test modes 20-14 also, since these has the same BOF
Ghost Frequency Tests #1
TGBT14A_912 session 2
Turn VEGAS off and on. Complains about no MMCM calibration values.
Clear by various OFF / ONs, and cannot replicate.
Scan 1 fsw_issue noswitch_mode10
See a line at 1421.405 and also one at 1409.686
In channels: 12275 and 28659. Difference is 16384 c.f. 16384...
Scan 2 fsw_issue_noswitch_nocal_mode20 - no sign of the image
BOF file is l8_ver145_1500_smanew_2014_Jul_02_1742.bof
Want to try Randy's build, but need to wait for Joe. Try checking LO blanking values in each mode
Blanking checks
Errors in blanking MR
WE SHOULD NOT CHANGE THE MR AT THIS POINT.
for frequency switching, since the frequency switch is only done once (not twice), the phase time used should be swperiod / 2.0, not /4.0.
for tp (with cal), MR says to ignore Doppler. Should it check Doppler?
for tp (with cal) should do duty cycle checks based on the blanking value in Joe's table
Mode 1
tp_nocal, topo - looks correct
tp_nocal, lsrk - looks correct. Doppler tracking should happen on cycles of seconds, but I do not ask for this to be checked.
tp (with cal), topo. Setting 38ms, and using 38ms in check. Should be setting and using value from Joe's table.
tp (with cal), lsrk. Setting 16ms, and using 16ms. Should be setting and using value from Joe's table.
fsw (with cal), topo. Setting 38ms, and using 38ms. Should be setting value from Joe's table, using 16ms.
fsw (with cal), lsrk. Setting 16ms, and using 16ms. Should be setting value from Joe's table, and using 38ms.
fsw switching periods less than 250ms are NOT checked by the config tool.
Mode 2
looks like Mode 1
Mode 10
tp_nocal, topo, looks correct.
tp_nocal, lsrk, looks correct.
tp, topo. Setting and using 38ms in check. Assume the rest will be like Mode 1 (I haven't checked).
Ghost frequency checks #2
Get Joe to switch to Randy's build of the new fix.
Scan 3 - fsw_issue noswitch_mode10 - seems ghost is still there.
BOF file l8_ver145_2014_Jul_01_1633.bof
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Topic revision: r3 - 2015-01-27,
RichardPrestage
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