Dear Mugundhan, In answer to your question, yes we have used the single output from the VALON, divide it into two using two-way power splitter and then given the inputs to ADC.
Yes, we used a noise source to see the correlation between the channels. On Wed, Nov 27, 2019 at 10:23 AM Mugundhan vijayaraghavan < [email protected]> wrote: > Another question. Are you using power dividing a single output of the > Valon and giving to both ADCs? When you do this you see correlation using > noise or cw in all four channels? > > On Wed 27 Nov, 2019 09:16 'Nikita Rathore' via [email protected], > <[email protected]> wrote: > >> Dear Mugundhan, >> >> Many thanks for your reply. >> >> To answer your question, yes, the same sampling clock is given to both >> the ADCs from the same source (a Valon synthesizer). >> >> Could you please tell me how to use the 1pps signal to find the delay on >> the FPGA? The design has a coarse delay before the PFB block and fine >> delays after the FFT block. >> >> On Tue, Nov 26, 2019 at 6:35 PM Mugundhan vijayaraghavan < >> [email protected]> wrote: >> >>> Hi Nikitha, >>> >>> Are the sampling clocks given to the adc from the same source? If you're >>> giving from a different source, please check if both are synchronised. Then >>> the 1pps signal can be independently be used to find the delay in the >>> electronics and can be corrected for using delay blocks on the FPGA. >>> >>> Regards, >>> >>> Mugundhan >>> >>> On Tue 26 Nov, 2019 13:25 'Nikita Rathore' via [email protected], >>> <[email protected]> wrote: >>> >>>> Dear Casperites, >>>> >>>> I am trying to make a 4-element interferometer at L-band (bandwidth 300 >>>> MHz) on a ROACH2 Board which has 2 x 5Gsps (ASIAA) ADC boards. I >>>> successfully compiled and tested a 2-element interferometer, through drift >>>> scans of the sun, and it yields fringes as expected. >>>> >>>> However, I have not been able to replicate these fringes with a >>>> 4-element design, so I started testing a 2-element correlator using two >>>> different ADCs on the same ROACH2. I was earlier using a software >>>> synchronization, as suggested in the tutorial. >>>> >>>> Could you please guide me on how to synchronize the two cross ADC of >>>> the same ROACH2 Board so they can be in sync with the FPGA clock (150MHz) >>>> which is taken from one of the ADC clocks (adc0 in my case). We have used >>>> two ADC1x5000-8 of the board for the experiment. We noticed the two sync >>>> port on the Board and as mentioned on the Casper site we had synchronized >>>> our ADC by 1pps signal and also by software. I have attached the results. >>>> >>>> My question is how to synchronize these two ADC by a pps signal and >>>> also do we need to synchronize the cross ADC of the same Board when working >>>> for correlator. In my case, I had the same results for synchronized and >>>> unsynchronized ADC. >>>> Synchronization of two cross ADC >>>> <https://docs.google.com/a/iiti.ac.in/document/d/1fdzVWFTYx55IftxvvgSxvJfFk9x1Q89-Gum2iukoVpo/edit?usp=drive_web> >>>> >>>> >>>> -- >>>> Nikita Rathore >>>> Junior Research Fellow >>>> Discipline of Astronomy, Astrophysics & Space Engineering (DAASE) >>>> Indian Institute of Technology, Indore >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "[email protected]" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAOvmUY5%3D9XcjrDBigY4Gz2TkxeCONcZA2dciTeRgE%3DVbeqBB0Q%40mail.gmail.com >>>> <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAOvmUY5%3D9XcjrDBigY4Gz2TkxeCONcZA2dciTeRgE%3DVbeqBB0Q%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "[email protected]" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAD560xn0AkOn4%2B%2BcWo9jwhw1g5332kjMKhjh%3DA6967qq5ENU%2BQ%40mail.gmail.com >>> <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAD560xn0AkOn4%2B%2BcWo9jwhw1g5332kjMKhjh%3DA6967qq5ENU%2BQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> Nikita Rathore >> Junior Research Fellow >> Discipline of Astronomy, Astrophysics & Space Engineering (DAASE) >> Indian Institute of Technology, Indore >> >> -- >> You received this message because you are subscribed to the Google Groups >> "[email protected]" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAOvmUY4A1_Ez3bnN6LNxx9buz8L0pMy0qzXrVib3R5Q%2B%2BS%2B_%2BA%40mail.gmail.com >> <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAOvmUY4A1_Ez3bnN6LNxx9buz8L0pMy0qzXrVib3R5Q%2B%2BS%2B_%2BA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups " > [email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAD560xmPnYiYVE%2Bhk8XLWJHTcHcEor3pq9anA0MeHMa_40XEAA%40mail.gmail.com > <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAD560xmPnYiYVE%2Bhk8XLWJHTcHcEor3pq9anA0MeHMa_40XEAA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- Nikita Rathore Junior Research Fellow Discipline of Astronomy, Astrophysics & Space Engineering (DAASE) Indian Institute of Technology, Indore -- You received this message because you are subscribed to the Google Groups "[email protected]" group. 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