VEGAS Team Meeting

Attendees:

Adam, Marty, John, Joe, Randy, Ray, Anish, Jason, Sam

Agenda:

1. Updates on the OG(P) calibration
2. Update on hardware fix for Mode 10-19
3. Test Time
4. Other

Meeting notes:

1. Updates on the OG(P) calibration
   • Tests with IF rack noise source were not quantified because the calibration did not affect the spurs
   • Researching alternative test methodologies
     • looking at mirroring/ghost images (left/right) are being handled
     • May require noise source to not be in the center of the band
     • Should test with receiver IF after noise source calibration as a sanity check
2. Mode 10-19 hardware fix
   • Discrepancy in gain vs. earlier version that works with the software fix
   • Discovered that cross-coupling noise source v139 was reasonable, but subsequent version was saturated
   • Looked an GB vs. UCB build environments
   • Created a test data flow to determine where the values were corrupted
   • Hardware issues stopped research - working with CIS to determine cause - then restart parallel builds
     • UCB & NRAO
3. Test Time
   • Wednesday (1/2 day) - Maybe the new calibration [Marganian, Kobelski]
   • Friday
4. Other
   • Anish has noticed a Mode 10 Cascaded Integrated Comb (CIC) filter (L8) issues
     • Could be response at edge of filter
   • Adam discussed a problem getting the HBW mode into Bank A when using KFPA
     • Wiring prevents using beam one on Bank A
     • Blanking has to be long enough to cover HBW on other banks
     • Edge triggering in HBW mode would solve the issue, but it is a good amount of work
     • Establishing a two-millisecond minimum blanking would also solve the issue
     • Optimum would be have the logic added to config tool to set the correct parameters for this situation
       • Ray and Joe to research