ChandrayaanMiniRF Project

Herewith collected info about the Chandrayaan mini-RF project.

related files in ~fghigo/GBT/miniRF/ and ~fghigo/fscratch/miniRF/

Sessions (link to summary and processing page):
Date Session what
2008/10/15 AGBT08B_049_01, 4.5hrs pol cal: spiders on 3C48, OnOffs on CassA, Moon, CygA, 3C138
2009/01/26 AGBT08B_049_02, 3.8hrs failed to track properly until the last few minutes.
2009/02/27 AGBT08B_049_03, 2 hrs sucessful track on housekeeping signal; tests with test tone and pulse pattern.
2009/02/28 AGBT08B_049_04, 5 hrs Calibration run on miniRF itself, plus cal sources

Session Writeups


  People   phone numbers cell
  Ben Bussey   phone number
  Bryan Butler   575-835-7261 505-818-9493
  Helene Winters   240-228-8507 301-653-1364
  Ron Schultze   443-955-3168  


    Transmitting antenna 40 Watts 46.02 dBm dB milliwatts
    Gain 26 dBi Gain =4πAeff2
    transmitter losses -1.7 dB
    hence peak EIRP = 70.3 dBm
    .
    Frequency = 2384.15 MHz = λ12.58 cm
    .
    Space Loss lunar distance 375000km LP = -211.5 dB LP = 20 log(4πR/λ) dB
    GBT gain Aeff = 7854 * 0.65 +66.1 dB
    one linear polarized channel -3 dB
    receiver and ohmic losses -2 dB
    grand total 9.8x10-9 mW -80.1 dBm
For the more definitive version, reference Rogers link estimates, attached at the bottom.


Plots from Jan 26 data on housekeeping signal.

  • Fig 1 : Scan 17, XX pol: average over 5-minute scan
    xxplot s17Jan26.jpg


Things to remember for the Feb 28th run

  • logging az/el
  • make configs for SP+GUPPI and SP+GASP
  • script for SP to balance properly
  • Make sb for balance on the Moon


-- FrankGhigo - 17 Feb 2009

Topic attachments
I Attachment Action Size Date Who Comment
2009-02-23GBT_Cal_TimeLine.pdfpdf 2009-02-23GBT_Cal_TimeLine.pdf manage 77 K 2009-02-27 - 11:00 FrankGhigo Ron's Draft Timeline: Feb27-28
LinkEstimate23Feb09All_rdn.pdfpdf LinkEstimate23Feb09All_rdn.pdf manage 527 K 2009-02-23 - 20:14 FrankGhigo Link Estimates by Roger
xxplot_s17Jan26.jpgjpg xxplot_s17Jan26.jpg manage 56 K 2009-02-22 - 19:12 FrankGhigo Fig 1 : Scan 17, XX pol
Topic revision: r13 - 2009-08-13, FrankGhigo
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