Dear Siddharth
Yes, we have two 16-input boards (total 32 inputs) working correctly on ROACH-2. We use it to get 16 simultaneous complex RF beams. You are welcome to follow up if you want more details. My PhD student Viduneth on CC is experienced in it. Cheers, Arjuna Arjuna Madanayake Associate Professor ECE, University of Akron Tel: 330-957-8704 (M) blogs.uakron.edu/aspc-lab<http://blogs.uakron.edu/aspc-lab> blogs.uakron.edu/dharma<http://blogs.uakron.edu/dharma> "We wish to pursue the truth no matter where it leads but to find the truth we need imagination and skepticism both. We will not be afraid to speculate, but we will be careful to distinguish speculation from fact. The Cosmos is full beyond measure of elegant truths, of exquisite interrelationships, of the awesome machinery of nature.” - Carl Sagan ________________________________ From: Siddharth Savyasachi Malu <[email protected]> Sent: Friday, October 20, 2017 6:42 AM To: James Smith Cc: LIST CASPER; Indrajit Vittal Barve Subject: Re: [casper] Choice of ADC for 16-element interferometer Thank you, James, for your reply. I have tried ROACH2v2, and the programmer working with me had some issues porting their ROACH1 design to ROACH2. However, it looks like ROACH2 would be the way to go, and that the ADC16x250-8 is usable only with ROACH2 currently. In this context, may I ask if there is someone who has experience setting up ADC16x250-8 with ROACH2, with 4 or 8 inputs? Also, can a single ROACH2v2 board have two of these ADCs? Also, I think it would be worthwhile starting with a smaller version of an interferometer, say a 4-element, 250 MHz bandwidth version. Is there any chance I might be able to borrow a ROACH1 for about 3 months, if anyone has an old board they aren't using anymore? Thanks, Siddharth On Fri, Oct 20, 2017 at 3:58 PM, James Smith <[email protected]<mailto:[email protected]>> wrote: Siddharth, ROACH1 is quite deprecated now, we don't recommend it for new projects. There are still a number of them floating around, but no active development on the libraries to support them. I don't know of any ADCs with more than 2 inputs. You'd also be quite pressed to fit a full 16-element correlator onto a single ROACH. With a ROACH2 you may manage if it's simple. Regards, James On Fri, Oct 20, 2017 at 12:26 PM, Siddharth Malu <[email protected]<mailto:[email protected]>> wrote: Dear CASPERites, Many, thanks, Indrajit, for your reply. Are there ADCs that can be used with ROACH1 and have more than 2 inputs? I am starting from scratch, and as far as I can see from CASPER websites, it would be easier to set up ROACH1 as compared to ROACH2, and given the large number of ROACH1 users, it may be easier to get help on ROACH1. But I'd very much like to hear opinions from CASPERites about this. Many thanks, and look forward to your replies. Best regards, Siddharth On Fri, Oct 20, 2017 at 11:56 AM, Indrajit Vittal Barve <[email protected]<mailto:[email protected]>> wrote: Dear siddharth, Please go through this message. ADC16 is not (yet?) supported on ROACH1. So consider with ROACH 2. https://www.mail-archive.com/[email protected]/msg06320.html With regards Indrajit On 20 Oct 2017 11:25 am, Siddharth Savyasachi Malu <[email protected]<mailto:[email protected]>> wrote: Dear CASPERites, I am trying to design a cheap 16-element interferometer using a ROACH1 board with 250-500 MHz bandwidth. Would you suggest the ADC16x250-8 for this purpose? Best regards, Siddharth -- Siddharth Malu Centre of Astronomy Indian Institute of Technology Indore Indore, India -- You received this message because you are subscribed to the Google Groups "[email protected]<mailto:[email protected]>" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:[email protected]>. To post to this group, send email to [email protected]<mailto:[email protected]>. -- You received this message because you are subscribed to the Google Groups "[email protected]<mailto:[email protected]>" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:[email protected]>. To post to this group, send email to [email protected]<mailto:[email protected]>. -- 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]<mailto:[email protected]>. To post to this group, send email to [email protected]<mailto:[email protected]>. -- 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 post to this group, send email to [email protected].
