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  • ** [[27-m Antenna Commands]] ** [[2.1-m Antennas]]
    14 KB (1,543 words) - 11:12, 20 September 2018
  • ...flux density to account for the finite size of the EOVSA (2.1-m diameter) antennas. Once this as-observed flux density spectrum <math>S(f)</math> is known, t ...for KSRBL (Dou et al. 2009, PASP, 121, 512). The pointing offsets for all antennas can be determined simultaneously, and as a function of frequency, by offset
    22 KB (3,603 words) - 04:33, 10 September 2017
  • ...time that the starburst program was stopped (due to problems with the 27-m antennas), the hardware was largely, but not completely assembled. Here is a fairly
    2 KB (391 words) - 20:41, 7 September 2016
  • ...ging level. Still, it is safest to use a non-zero setting at any time the antennas are slewing from one source to another. ...o, the frontend attenuation should be under active control at any time the antennas are pointed at the Sun, so that large flares do not occur that can damage t
    15 KB (2,245 words) - 03:43, 27 September 2016
  • ...rferometric pointing on cosmic sources or planets using one or both of the 27-m dishes. Each of these has merits, and all will likely be implemented. ...121..512D Dou et al. 2009, PASP, 121, 512]). The pointing offsets for all antennas can be determined simultaneously, and as a function of frequency, by offset
    35 KB (5,622 words) - 18:02, 26 September 2016
  • ...he bandwidth. It is also valuable to test the sensitivity limit of EOVSA's 27-m + 2-m baseline within a reasonable amount of integration time (10 minutes). ..._visibility.py". They display the visibility of all VLA calibrators by the 27-m antenna above a certain flux density threshold (defined by parameter "minfl
    9 KB (1,374 words) - 03:16, 29 March 2017
  • ...rotation between the 27-m antenna and the AzEl mounts, but not between the 27-m and the older equatorial mounts. This angle is called the "parallactic ang [[File:Feed_diagram.PNG|thumb|400px|'''Fig. 2:''' Illustration of 27-m feed horns (left), 2.1-m feed package (middle), and rotation of feed orient
    13 KB (2,051 words) - 12:49, 18 November 2016
  • ...ose of running Windows-only utilities including monitoring the ACC and the antennas. The DELL service tag number is C303GQ1. The main features of win1 are: ...more of these systems. Note that losing a ROACH board means that the two antennas input to that board are lost, and additionally all frequency channels (1/8t
    25 KB (3,892 words) - 17:45, 22 January 2018
  • ...nd, which initiates a pointing procedure that does multiple offsets of the antennas and takes data that will be analyzed for determining frequency-dependent po ...in a subarray). If it is desired that a macro-command refer to only some antennas, it is best practice to omit the others from the current subarray first.
    26 KB (4,001 words) - 19:10, 27 September 2016
  • ...to an equatorial mount. It should be noted that it is calculated for all antennas, independent of whether the dish is an azel or equatorial mount. For a giv ...allow the counter-weights to clear. This has been done with some care on antennas 9 and 10, with the following results (by way of example). The “soft limi
    7 KB (1,218 words) - 19:17, 4 January 2017
  • The first step is to determine a consistent coordinate system. Antennas are typically measured in units such as meters along the ground. We will u ...aselines are differences of coordinates, i.e. for the baseline between two antennas we have a vector:
    17 KB (2,801 words) - 17:43, 28 June 2017
  • '''05:42 UT''' Attempting to see the Moon with 27-m Hi receiver. I could see nothing at nominal position, but then I got a who ...ged (see upper left panel). The key is that XY and YX amplitude drops for antennas 1-5 and 12, when PA = -chi, while XX and YY increase.]]
    21 KB (3,613 words) - 11:12, 2 April 2017
  • ...rotation between the 27-m antenna and the AzEl mounts, but not between the 27-m and the older equatorial mounts. This angle is called the "parallactic ang [[File:Feed_diagram.PNG|thumb|400px|'''Fig. 2:''' Illustration of 27-m feed horns (left), 2.1-m feed package (middle), and rotation of feed orient
    26 KB (4,149 words) - 15:33, 1 January 2018
  • ...t|'''Fig. 1:'''Amp vs. hour angle of the Jan 4 observations on 3C84 on all antennas (column) and polarizations (row; showing XX, XY, YX, and YY). Blue is the o ...decided to take some data on 3C273 with the low-frequency receiver on the 27-m. I created a sequence 3bands_lo.fsq, which tunes to bands 5, 7, 9. These
    8 KB (1,396 words) - 11:12, 2 April 2017
  • ...ed from solpntanal() is added for all offsets except RA offsets on the old antennas (9, 10, 11 & 13). On those, it must be subtracted (basically it is a chang '''00:52 UT''' During today's solar observations, I made sure that the 27-m was tracking on all three scans. I will now do a test calibration on 3C84
    10 KB (1,696 words) - 11:13, 2 April 2017
  • ...M attenuations working, so it should be okay now to use dcmauto-on for all antennas. '''20:47 UT''' This morning I did a complete test of the 27-m pointing model, by setting each parameter to unity in turn, with all others
    24 KB (4,205 words) - 18:56, 17 May 2017
  • ...k the performance of Ant 5, only to find that it looks just like the other antennas. Looking into it further, I discovered that Kjell had put the notch filter '''03:59 UT''' Because the 27-m focus rotation mechanism was out due to a power-supply failure, there have
    8 KB (1,465 words) - 11:54, 31 May 2017
  • ...ypical reference calibration would cover 34 bands, 2 polarizations, and 13 antennas. The routines (on pipeline machine) to retrieve and analyze the data are in ...nd refcal['flag'] have a shape of (15, 2, 34) -- which corresponds to # of antennas, # of polarizations, and # of bands.
    55 KB (6,549 words) - 21:26, 19 March 2018
  • '''12:35 UT''' Good news! The 27-m receiver is back. When installed, it seemed to have a problem still with t ...oday's change is just as large, and in the opposite sense. However, other antennas had more complex changes, so this is not a general rule...
    4 KB (760 words) - 13:17, 1 September 2017
  • :* one with the 27-m feed tracking parallactic angle (gives parallel-feed data for azel dishes 1 :* one with the 27-m feed tracking parallactic angle + 90 degrees (gives crossed-feed data for a
    6 KB (1,012 words) - 14:23, 8 January 2018
  • ...made in C configuration (max baseline length 3 km) with the full array (27 antennas) in L band (1-2 GHz), with 2 MHz frequency resolution and 50 ms time resolu
    4 KB (554 words) - 13:17, 28 September 2018
  • '''At the end of the day, all antennas except for 11 & 13 (and 3, which has been down for a while for gear box fai
    4 KB (657 words) - 00:51, 29 November 2017
  • ...made in C configuration (max baseline length 3 km) with the full array (27 antennas) in L band (1-2 GHz), with 2 MHz frequency resolution and 50 ms time resolu
    2 KB (219 words) - 22:16, 19 September 2018
  • ...made in C configuration (max baseline length 3 km) with the full array (27 antennas) in L band (1-2 GHz), with 2 MHz frequency resolution and 50 ms time resolu
    2 KB (171 words) - 02:24, 24 July 2018

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