Table of Contents
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VTC Members are encouraged to contribute short project status reports on this page.
New VGOS stations and station upgrades to VGOS
GGAO
GGAO and Westford resumed their VGOS Demonstration Series sessions in November and have observed three more sessions of 1, 5, and 24 hours.
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Mamoru Sekido - 28 April 2016
Yebes
Broadband system temperatures are ~ 50 K - 70 K. The warm amplifiers after the cryogenic ones and before the optical fiber converters had to be removed to avoid saturating the amplifiers used to modulate the optical laser. This increased the Tsys by a factor 2. Furthermore one of the optical channels uses an 18 dB amplifier and the other one 9 dB. This is an issue to be solved in the future.
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Pablo de Vicente - 28 Jan 2016
S/X Observations with fast antenna network
Two FAST observations were performed in December 2015.
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Pablo de Vicente - 24 Feb 2016
GGAO, Westford, Wetzell, Yebes Broadband Fringe Testing
- FT6119
- Gs and Wf have been recording all four bands using UDCs, RDBE-Gs and Mark6.
- Ws and Yj recorded band B (sky frequency of 4712.4 GHz) with the DBBC2 and Mark6.
- The PCFS (version 9.12.13 ) was used to control the systems.
- Fringes were detected for both polarization for Ws but only 1 for Yj (configuration error was the cause for not both polarization's).
- FT6128 was a retest of FT6119 with the goal of correcting configuration issues and other anomalies observed.
- Fringes were detected for both polarization for Ws and Yj.
- Anomalies still existed.
- FT6140 incorporated BandC ( 5832.4 GHz)into the observation for Ws and Yj (2 Band Test)
- Fringes were detected for both bands / pols.
- Improved performance to earlier tests
- Investigations continues.
- Yj, RDBE-G was tagged along on Band B. No fringes detected, problem determined.
- FT6XXX Next steps under discussion.
Chet Ruszczyk, for folks at Gs, Wf, Ws, Yj, Haystack and Ed (PCFS) - 25 May 2016
Technology Updates
DBBC3
The development activity is mainly concentrated on the realization of the unified control software which connects all the functionalities realised by the the different parts of the system.
A number of calibrations are required for each IF and simplification/automatization methods are under test. A number of commands will be added to the control software in order to activate in background such 'continuous' calibrations if required.
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A number of VGOS complete systems (8 IFs) is under construction.
G. Tuccari - 26 26 Jan 2016
DBBC3 Report
The DBBC unified control software was completed in the main tasks, still remaining to be added the functionality for the DDC and PFB modes,
now possible with low level commands. Completion in its first formal version and testing are under way.
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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
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- The PCFS (version 9.12.13 ) was used to control the systems.
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- Fringes were detected for both polarization for Ws and Yj.
- Anomalies still existed.
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27 April 2016