Multiple phase cal tones in experiment c1014 ($01JUL09XA)

Introduction

Experiment c1014 ($01JUL09XA) was observed with channel frequency band 8 MHz channel. Correlator extracted phase cal at frequencies 10KHz and 4010 KHz at X-band and 10KHz, 6010 KHz at S-band. It was fringed three times,
  1. Normal fringing with phase cal at frequencies 4010 KHz at X-band and 6010 KHz at S-band.
  2. with using phase cal at 10KHz and X and S band (Exception: 6010 KHz tone at GILCREEK at S-band was used in all solutions).
  3. the same as the previous, but in addition 2 LSB channels were dropped. As a result only 14 USB channels remained as in Mark-3 epoch.
Three databases were created.

Comparison of solutions

  1. Listing of normal solution s1
    Listing of solution with 10KHz phase cal and 16 channels s2

  2. Listing of normal solution s3
    Listing of solution with 10KHz phase cal and 14 channels s4

NB: only comparison of solutions s1/s2 and s3/s4 is legitimate.

Conclusions

  1. The differences in solutions with using 6010/4010 phase cal versus solutions with 10KHz phase cal is very small, but solution with 6010/4010 KHz phase cal is slightly better.

  2. The differences in solutions with 16 channels versus solution with 14 channels is noticeable. 16 channel solution is better.

  3. LSB channels affects different station differently. MATERA had the greatest improvement, WESTFORD had much less improvement.

  4. Addiing two additional LSB channels can result in changes in vertical site position at the 6 mm level.

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This page was prepared by Leonid Petrov

Last update: 28-DEC-2001 18:49:29