Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread 'Siddharth Savyasachi Malu' via casper@lists.berkeley.edu
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

[casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread 'Siddharth Savyasachi Malu' via casper@lists.berkeley.edu
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

Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread Madanayake,Habarakada Liyanachchi
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

Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread James Smith
If you've got a ROACH2, there's not much point in getting started on a ROACH1, the tools are more mature on a ROACH2. I can't provide much support myself, but there are other users in the mailing list who might be able to get you started. On Fri, Oct 20, 2017 at 12:42 PM, Siddharth Savyasachi

Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread Siddharth Savyasachi Malu
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

Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread James Smith
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

Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread Siddharth Malu
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

Re: [casper] Choice of ADC for 16-element interferometer

2017-10-20 Thread Indrajit Vittal Barve
Dear siddharth, Please go through this message. ADC16 is not (yet?) supported on ROACH1.  So consider with ROACH 2. https://www.mail-archive.com/casper@lists.berkeley.edu/msg06320.html With  regards Indrajit On 20 Oct 2017 11:25 am, Siddharth Savyasachi Malu