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mg002

Modified 11:10, 8 Aug 2017 by alef | Page History
    Table of contents
    1. 1. General:
    2. 2. Fringes:
    3. 3. Notes:
    4. 4. Auxiliary:

    Version as of 17:25, 3 Jul 2024

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    General:

    • This experiment has ALMA with 32x62.5MHz channels sampled at 125MHz.
    • VLBA was recorded with 2x128MHz channels
    • DBBC2 statons were recording 1x512MHz wide channel
    • Pico and Yebes inadvertendly observed in 2-pol 16x32MHz PFB mode due to a feature incompleteness in new FieldSystem

    Fringes:


    Station Frimges Comment
    Ef yes no0093.pdf Effelsberg DBBC2
    Eb yes Effelsberg RDBE
    On yes no0093.pdf  
    Aa yes no0093.pdf  
    Mh no  Auto-correlations indicate errors
    Pv yes (PFB) LCP data during mg002 bad (stats 78%:0:0:22%), but okay in ma00x and mb00x
    Ys yes (PFB)  
    Fd yes  
    La yes  
    Pt yes weak or no fringes
    Nl yes  
    La yes  
    Kp yes  
    Ov yes  
    Br yes Fringes only to La/Mk/Ov
    1. Mh weak fringes in LCP to Onsala at beginning. Auto-correlations indicate errors in Mh.
    2. No fringes to Pt
    3. VLBA Fringes were found using the 2x128MHz mode.
    4. Fringes between ALMA and Eb (Effelsberg RDBE 2x128MHz): Aa-Eb.pdf . SNR for Aa-Eb much lower than for Aa-Ef. Needs to be investigated
    5. Strong fringes between ALMA and Yebes, Pico with PFB setup  in .vex and with ALMA-matching 9*32MHz zoombands in .v2d (288 MHz total): Aa-Ys RR, and Aa-Pv RR

    6. Fringes between Effelsberg and Yebes(,Pico) with 16x32M PFB setup and 31x16MHz (due PFB edge channels) zoombands: Ef-Ys RR 31x16M, Ef-Ys LL 31x16M, Pv-Ys RR 31x16M

    Notes:

    1. PV scan: /mnt/disks/4/7/data/ma008_PV_093-2145.vdif marked invalid by vdifuse
    2. PV: bad statistics before 092-2100 (OK after systems was restarted at Pico)
    3. PV: DBBC2 backend ran in polyphase filter bank mode, data are 16 ch x 2 pol x 32 MHz
    4. YS: DBBC2 backend ran in polyphase filter bank mode, data are 16 ch x 2 pol x 32 MHz
    5. MH: Autoccorelations look corrupted. Suspicous of 32 MHz sub-bands displayed as full band: So far no fringes, except for LCP (weak) in Scan No064. (MM-LCP.ps     MM-RCP.ps)
    6. VLBA: subintNS has to be choosen to be 640000 when adding in VLBA (and EB) having 128 MHz wide subbands. If run with the default settings an WARNING concerning "data gaps" is received and no data is being correlated.

    Auxiliary:

    The exact zoom bands after matching ALMA constraints against Pico/Yebes 32 MHz PFB bands, without yet considering extra coverage of the 1x512MHz  and 2x256MHz of other stations, are:

    addZoomFreq = freq@86508.000000/bw@32.000000/noparent@true  # ALMA ch11 x Pico ch00
addZoomFreq = freq@86476.000000/bw@28.328125/noparent@true  # ALMA ch12 x Pico ch01
addZoomFreq = freq@86444.000000/bw@32.000000/noparent@true  # ALMA ch12 x Pico ch02
addZoomFreq = freq@86444.000000/bw@1.734375/noparent@true  # ALMA ch13 x Pico ch02
addZoomFreq = freq@86412.000000/bw@32.000000/noparent@true  # ALMA ch13 x Pico ch03
addZoomFreq = freq@86380.000000/bw@7.140625/noparent@true  # ALMA ch14 x Pico ch04
addZoomFreq = freq@86348.000000/bw@32.000000/noparent@true  # ALMA ch14 x Pico ch05
addZoomFreq = freq@86316.000000/bw@12.546875/noparent@true  # ALMA ch15 x Pico ch06
addZoomFreq = freq@86284.000000/bw@32.000000/noparent@true  # ALMA ch15 x Pico ch07
addZoomFreq = freq@86252.000000/bw@17.953125/noparent@true  # ALMA ch16 x Pico ch08
addZoomFreq = freq@86220.000000/bw@32.000000/noparent@true  # ALMA ch16 x Pico ch09
addZoomFreq = freq@86188.000000/bw@23.359375/noparent@true  # ALMA ch17 x Pico ch10
addZoomFreq = freq@86156.000000/bw@32.000000/noparent@true  # ALMA ch17 x Pico ch11
addZoomFreq = freq@86124.000000/bw@28.765625/noparent@true  # ALMA ch18 x Pico ch12
addZoomFreq = freq@86092.000000/bw@32.000000/noparent@true  # ALMA ch18 x Pico ch13
addZoomFreq = freq@86092.000000/bw@2.171875/noparent@true  # ALMA ch19 x Pico ch13
addZoomFreq = freq@86060.000000/bw@32.000000/noparent@true  # ALMA ch19 x Pico ch14
addZoomFreq = freq@86028.000000/bw@7.578125/noparent@true  # ALMA ch20 x Pico ch15

    The above correlates fine in DiFX but difx2fits and difx2mark4 error out at the unequal bandwidths. One equal-bandwidth option with 9 x  32 MHz is:

    addZoomFreq = freq@86508.000000/bw@32.000000/noparent@true  # ALMA ch11 x Pico ch00
addZoomFreq = freq@86444.000000/bw@32.000000/noparent@true  # ALMA ch12 x Pico ch02
addZoomFreq = freq@86412.000000/bw@32.000000/noparent@true  # ALMA ch13 x Pico ch03
addZoomFreq = freq@86348.000000/bw@32.000000/noparent@true  # ALMA ch14 x Pico ch05
addZoomFreq = freq@86284.000000/bw@32.000000/noparent@true  # ALMA ch15 x Pico ch07
addZoomFreq = freq@86220.000000/bw@32.000000/noparent@true  # ALMA ch16 x Pico ch09
addZoomFreq = freq@86156.000000/bw@32.000000/noparent@true  # ALMA ch17 x Pico ch11
addZoomFreq = freq@86092.000000/bw@32.000000/noparent@true  # ALMA ch18 x Pico ch13
addZoomFreq = freq@86060.000000/bw@32.000000/noparent@true  # ALMA ch19 x Pico ch14

    The VEX file info for Yebes and Pico are new $FREQ and $TRACK as below:

    def FREQ_PFB;
     sample_rate = 64.00 Ms/sec;  * (2bits/sample)
   chan_def = : 86540.00 MHz : L : 32.00 MHz : &CH01 : &BBC01 : &NoCal; *Rcp
   chan_def = : 86540.00 MHz : L : 32.00 MHz : &CH02 : &BBC02 : &NoCal; *Lcp
   chan_def = : 86508.00 MHz : L : 32.00 MHz : &CH03 : &BBC03 : &NoCal; *Rcp
   chan_def = : 86508.00 MHz : L : 32.00 MHz : &CH04 : &BBC04 : &NoCal; *Lcp
   chan_def = : 86476.00 MHz : L : 32.00 MHz : &CH05 : &BBC05 : &NoCal; *Rcp
   chan_def = : 86476.00 MHz : L : 32.00 MHz : &CH06 : &BBC06 : &NoCal; *Lcp
   chan_def = : 86444.00 MHz : L : 32.00 MHz : &CH07 : &BBC07 : &NoCal; *Rcp
   chan_def = : 86444.00 MHz : L : 32.00 MHz : &CH08 : &BBC08 : &NoCal; *Lcp
   chan_def = : 86412.00 MHz : L : 32.00 MHz : &CH09 : &BBC09 : &NoCal; *Rcp
   chan_def = : 86412.00 MHz : L : 32.00 MHz : &CH10 : &BBC10 : &NoCal; *Lcp
   chan_def = : 86380.00 MHz : L : 32.00 MHz : &CH11 : &BBC11 : &NoCal; *Rcp
   chan_def = : 86380.00 MHz : L : 32.00 MHz : &CH12 : &BBC12 : &NoCal; *Lcp
   chan_def = : 86348.00 MHz : L : 32.00 MHz : &CH13 : &BBC13 : &NoCal; *Rcp
   chan_def = : 86348.00 MHz : L : 32.00 MHz : &CH14 : &BBC14 : &NoCal; *Lcp
   chan_def = : 86316.00 MHz : L : 32.00 MHz : &CH15 : &BBC15 : &NoCal; *Rcp
   chan_def = : 86316.00 MHz : L : 32.00 MHz : &CH16 : &BBC16 : &NoCal; *Lcp
   chan_def = : 86284.00 MHz : L : 32.00 MHz : &CH17 : &BBC17 : &NoCal; *Rcp
   chan_def = : 86284.00 MHz : L : 32.00 MHz : &CH18 : &BBC18 : &NoCal; *Lcp
   chan_def = : 86252.00 MHz : L : 32.00 MHz : &CH19 : &BBC19 : &NoCal; *Rcp
   chan_def = : 86252.00 MHz : L : 32.00 MHz : &CH20 : &BBC20 : &NoCal; *Lcp
   chan_def = : 86220.00 MHz : L : 32.00 MHz : &CH21 : &BBC21 : &NoCal; *Rcp
   chan_def = : 86220.00 MHz : L : 32.00 MHz : &CH22 : &BBC22 : &NoCal; *Lcp
   chan_def = : 86188.00 MHz : L : 32.00 MHz : &CH23 : &BBC23 : &NoCal; *Rcp
   chan_def = : 86188.00 MHz : L : 32.00 MHz : &CH24 : &BBC24 : &NoCal; *Lcp
   chan_def = : 86156.00 MHz : L : 32.00 MHz : &CH25 : &BBC25 : &NoCal; *Rcp
   chan_def = : 86156.00 MHz : L : 32.00 MHz : &CH26 : &BBC26 : &NoCal; *Lcp
   chan_def = : 86124.00 MHz : L : 32.00 MHz : &CH27 : &BBC27 : &NoCal; *Rcp
   chan_def = : 86124.00 MHz : L : 32.00 MHz : &CH28 : &BBC28 : &NoCal; *Lcp
   chan_def = : 86092.00 MHz : L : 32.00 MHz : &CH29 : &BBC29 : &NoCal; *Rcp
   chan_def = : 86092.00 MHz : L : 32.00 MHz : &CH30 : &BBC30 : &NoCal; *Lcp
   chan_def = : 86060.00 MHz : L : 32.00 MHz : &CH31 : &BBC31 : &NoCal; *Rcp
   chan_def = : 86060.00 MHz : L : 32.00 MHz : &CH32 : &BBC32 : &NoCal; *Lcp
enddef;
...
def VDIF.PvPFB;
     track_frame_format = VDIF_5032-4096-32-2;  * Pico
     *track_frame_format = VDIF_8032-4096-32-2; * Yebes
     fanout_def =   : &CH01  : sign : 1: 1;
     fanout_def =   : &CH01  :  mag : 1: 1;
     fanout_def =   : &CH02  : sign : 1: 2;
     fanout_def =   : &CH02  :  mag : 1: 2;
     fanout_def =   : &CH03  : sign : 1: 3;
     fanout_def =   : &CH03  :  mag : 1: 3;
     fanout_def =   : &CH04  : sign : 1: 4;
     fanout_def =   : &CH04  :  mag : 1: 4;
     fanout_def =   : &CH05  : sign : 1: 5;
     fanout_def =   : &CH05  :  mag : 1: 5;
     fanout_def =   : &CH06  : sign : 1: 6;
     fanout_def =   : &CH06  :  mag : 1: 6;
     fanout_def =   : &CH07  : sign : 1: 7;
     fanout_def =   : &CH07  :  mag : 1: 7;
     fanout_def =   : &CH08  : sign : 1: 8;
     fanout_def =   : &CH08  :  mag : 1: 8;
     fanout_def =   : &CH09  : sign : 1: 9;
     fanout_def =   : &CH09  :  mag : 1: 9;
     fanout_def =   : &CH10  : sign : 1: 10;
     fanout_def =   : &CH10  :  mag : 1: 10;
     fanout_def =   : &CH11  : sign : 1: 11;
     fanout_def =   : &CH11  :  mag : 1: 11;
     fanout_def =   : &CH12  : sign : 1: 12;
     fanout_def =   : &CH12  :  mag : 1: 12;
     fanout_def =   : &CH13  : sign : 1: 13;
     fanout_def =   : &CH13  :  mag : 1: 13;
     fanout_def =   : &CH14  : sign : 1: 14;
     fanout_def =   : &CH14  :  mag : 1: 14;
     fanout_def =   : &CH15  : sign : 1: 15;
     fanout_def =   : &CH15  :  mag : 1: 15;
     fanout_def =   : &CH16  : sign : 1: 16;
     fanout_def =   : &CH16  :  mag : 1: 16;
     fanout_def =   : &CH17  : sign : 1: 17;
     fanout_def =   : &CH17  :  mag : 1: 17;
     fanout_def =   : &CH18  : sign : 1: 18;
     fanout_def =   : &CH18  :  mag : 1: 18;
     fanout_def =   : &CH19  : sign : 1: 19;
     fanout_def =   : &CH19  :  mag : 1: 19;
     fanout_def =   : &CH20  : sign : 1: 20;
     fanout_def =   : &CH20  :  mag : 1: 20;
     fanout_def =   : &CH21  : sign : 1: 21;
     fanout_def =   : &CH21  :  mag : 1: 21;
     fanout_def =   : &CH22  : sign : 1: 22;
     fanout_def =   : &CH22  :  mag : 1: 22;
     fanout_def =   : &CH23  : sign : 1: 23;
     fanout_def =   : &CH23  :  mag : 1: 23;
     fanout_def =   : &CH24  : sign : 1: 24;
     fanout_def =   : &CH24  :  mag : 1: 24;
     fanout_def =   : &CH25  : sign : 1: 25;
     fanout_def =   : &CH25  :  mag : 1: 25;
     fanout_def =   : &CH26  : sign : 1: 26;
     fanout_def =   : &CH26  :  mag : 1: 26;
     fanout_def =   : &CH27  : sign : 1: 27;
     fanout_def =   : &CH27  :  mag : 1: 27;
     fanout_def =   : &CH28  : sign : 1: 28;
     fanout_def =   : &CH28  :  mag : 1: 28;
     fanout_def =   : &CH29  : sign : 1: 29;
     fanout_def =   : &CH29  :  mag : 1: 29;
     fanout_def =   : &CH30  : sign : 1: 30;
     fanout_def =   : &CH30  :  mag : 1: 30;
     fanout_def =   : &CH31  : sign : 1: 31;
     fanout_def =   : &CH31  :  mag : 1: 31;
     fanout_def =   : &CH32  : sign : 1: 32;
     fanout_def =   : &CH32  :  mag : 1: 32;
enddef;
*