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The new synthesizer board GCAT has been developed and is in testing phase. It allows to use additional input reference frequencies from the H-Maser (ex. 100MHz)
when this is required.

 

G. Tuccari - 27 April 2016

GGAO, Westford, Wetzell, Yebes Broadband Fringe Testing


The preliminary VGOS observing sessions between GGAO (Gs) , Westford (Wf) , Wetzell South (Ws) and Yebes (Yj) has resulted in fringes between all sites for three sessions.  Schedules were generated for theses sessions.  The configuration of the systems for the tests have been as follows:
  1. FT6119 
    1. Gs and Wf have been recording all four bands using UDCs, RDBE-Gs and Mark6.
    2. Ws and Yj recorded band B (sky frequency of 4712.4 GHz) with the DBBC2 and Mark6.
      1. The PCFS (version 9.12.13 ) was used to control the systems.
    3. Fringes were detected for both polarization for Ws but only 1 for Yj (configuration error was the cause for not both polarization's).

  2. FT6128 was a retest of FT6119 with the goal of correcting configuration issues and other anomalies observed.
    1. Fringes were detected for both polarization for Ws and Yj.  
    2. Anomalies still existed.

  3. FT6140 incorporated BandC ( 5832.4 GHz)into the observation for Ws and Yj (2 Band Test)
    1. Fringes were detected for both bands / pols.
    2. Improved performance to earlier tests
    3. Investigations continues.
    4. Yj, RDBE-G was tagged along on Band B.  No fringes detected, problem determined.

  4. FT6XXX Next steps under discussion.

Chet Ruszczyk, for folks at Gs, Wf, Ws, Yj, Haystack and Ed (PCFS) - 25 May 2016