TGBT41A_912_22 - MR tests

Goals

• Test https://safe.nrao.edu/wiki/bin/view/GB/Software/ModificationRequest5Q414

Tests

Blanking time, messages

• Frequency switch calculations: MR_Mode10SP
• 1.0 secs is ok, 0.9 triggers it - blanking should be 2x38ms + 2x10.4ms - so this is correct.
• Config tool correctly reports only one message for each Bank.

nchan tests

• SB: MR_NchanModeTest. Combine different combinations of nchan, subband, etc. All works as expected

key / value tests

• SB: MR_NchanModeTest. Combine different combinations of upper and lower case.
• Keyword are case independent. After some work, so is the value "bank", but not "beam".

config tool should catch unknown keywords in the restfreq dictionary

• correctly catches unknown keywords, and fails to validate correctly

Add "subband" to the restfreq dictionary.

• Works as expected

Remove if3freq offsets

• Create scheduling block MR_IF3FREQ
• Scan 6 - 32768 channels, reduce to 4096
• Scan 7 - 4096 channels
• Spectral resolution is 5.7 kHz, so put in test tone at 9000011 kHz = 9000.011 MHz.
• Scan 8 - mistyped test tone
• Scan 9 - no sign of the test tone
• Scan 10 - put it at 9005.0 MHz to see if I see it at all. Mistyped again!
• Scan 11 - still don't see it - Fsky if offset. - switch to topo (although that shouldn't be it?)
• Scan 12 - still no line!! Could it be getting dwarfed by 3000K system temperature? I wouldn't have thought so, but maybe
• I was looking at the noise source!!! Reconfigure for Bank B.
• Scan 13 - see it easily.
• Scan 14 9000.011 MHz, don't see it. Maybe too close.
• Scan 15 - 9005.85938 - I don't see anything. Forgot the A-ToneB
• Scan 16 - Excatly in channel 1024 as expected. But did this mode have an offset? I think it was only modes 1,2,3
• Scan 17 - Mode 1 no test tone - as expected
• Scan 18 - 9375MHz - appears at 9375.0 / 256 - as expected. This means no IF3FREQ offset.
• Scan 19 - MR_DeltaFreqTest. Configure a 9000.0MHz test tone, and deltafreqs of:

restfreq = [  {"restfreq": 9000.0, "deltafreq":  -9.375, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  -7.03125, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  -4.6875, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  -2.34375, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  2.34375, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  4.6875, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  7.03125, "bank":"B"},
                     {"restfreq": 9000.0, "deltafreq":  9.375, "bank":"B"}]

• Lines come out in channels: 410, 826, 1242, 1626, 2458, 2874, 3290, 3674
• Frequencies: 8.999995 (much less than a channel width) in each case
• Had hoped for 409.6 and multiples thereof, but seem to get:
• 410, 413*2, 414*3, 406*4, 409*6, 410*7, 411*8, 408*9.
• Why not 410 in every case?
• try a smaller, whole multiple, i.e (23.4375 / 4096) * 128 = 0.732422
• Scan 20 - test for Melinda
• Scan 21 - test for Melinda
• Scan 22 - above test - forgot A-Tone B again!
• Line is at: 1536, 1664, 1792, 1920, 2176, 2304, 2432, 2560
• which is 12, 13, 14, 15, 17, 18, 19, 20 time 128.
• Thus they are appearing exactly where they should, to the channel.
• LO2? is set to 13250.

Conclusions

• Everything tests correctly, apart from Beam 1 case sensitivity, which is an old issue (nothing to do with these changes).
• We should keep this on the list of things to do.