[casper] Small-scale radio astronomy hardware project

For the last few years, I've been kicking-around paper-tiger designs for a new digital-sampler+RF front end for small-scale radio astronomy. I've been developing software tools for small radio observatories, based on Gnu Radio core software, and the USRP1 and USRP2 front-end hardware from

[casper] econo RF sampler

I've created a Yahoo group to discuss design, etc for the econo RF sampler I talked about the other day. If you have an interest, please join the Yahoo group. I don't want to clutter up the main CASPER list with low tech stuff like this :-) rf-samp...@yahoogroups.com

Re: [casper] econo RF sampler

subscribe-rf-samp...@yahoogroups.com http://us.mc1808.mail.yahoo.com/mc/compose?to=subscribe-rf-samp...@yahoogroups.com should be rf-sampler-subscr...@yahoogroups.com Sorry about that! -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium

Re: [casper] MATLAB Polyphase Filter Bank Code

On 06/06/2011 12:52 PM, Jayanth Chennamangalam wrote: Hi, I'm getting started on implementing a polyphase filter bank in CUDA. But before getting into it, it's probably a good idea if I play around with some simple implementation in a relatively more user-friendly environment such as MATLAB.

[casper] High speed processing on host

I'm involved a lot in Gnu Radio and the USRP hardware from Ettus, rather than the Roach boards from CASPER. But I have some questions about host-side processing, that the folks on this list might have some insights into. The USRP hardware was just upgraded to allow the use of 8-bit samples,

Re: [casper] High speed processing on host

On 11/20/2011 12:57 PM, Yashwant Gupta wrote: Hello Marcus, At the GMRT, we have a fully real-time all CPU based correlator + beamformer + pulsar receiver that takes in data from 64 analog inputs (32 antennas, dual polarization) each at 66 Msps max. I refer you to a publication that

Re: [casper] High speed processing on host

On 11/20/2011 03:47 PM, John Ford wrote: Have you done any profiling to see where the cycles are going? It seems on the surface that your 6 core Phenom system should be capable of processing 50 Megabytes per second. John It's not the data rate that's the issue, I can happily consume 50Msps

[casper] Somewhat tangential to this list

After failing to make any money of any significance on my IRA radio astronomy software over the years, I've decided to open-source it: https://github.com/patchvonbraun/IRA.git It currently only knows how to talk to USRP hardware, but one of the tasks a keener could do would be to arrange for

Re: Fwd: [casper] Dealing with extreme RFI

On 12/07/2017 06:43 PM, Dan Werthimer wrote: hi xavier, we use 8 bit wideband digitizers at arecibo and parkes where the RFI is fairly strong. do you think you might be able to get away with 8 bits ? : perhaps you know all this adc and dsp dynamic range stuff already, but here are some

Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

On 05/25/2018 09:24 AM, Vinand Prayag wrote: Hi, Please find attached the User Requirement. The bandwidth is actually only 250KHz Cheers, Vinand Are you envisaging an array, like the D1 telescope at Haystack? On Fri, May 25, 2018 at 5:20 PM Marcus D. Leech <mle...@ripnet.

Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

On 05/25/2018 07:28 AM, Vinand Prayag wrote: Hi all, We are looking at building a telescope in Mauritius which is called the Mauritius Deuterium Telescope, MDT for short. As the name suggests it is a Deuterium focused experiment. We have planned for a pathfinder station to be built for the

Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

valuable. Vinand Prayag Research Assistant University of Mauritius So, when you say 48 channels, you're talking 48 sky channels rather than 48 spectral channels, and you want to beam-form like they do at Haystack? On Fri, May 25, 2018 at 5:36 PM Marcus D. Leech <mle...@ripnet.com <mail

Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

investigating the possibility of fewer channels per station but the maximum will be 48. Vinand Ok, thanks for clearing that up. On Fri, May 25, 2018 at 7:23 PM Marcus D. Leech <mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote: On 05/25/2018 11:01 AM, Vinand Prayag wro

Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

On 05/25/2018 12:04 PM, Michael Inggs wrote: Hi Dan One of the tradeoff studies the guys are doing is the cost of a 48 channel analogue downconverter and low sample rate ADC. At present, direct demod with a SNAP looks simpler in terms of hardware complexity, but has not been costed. One of

Re: [casper] Availability of SNAP board for the Mauritius Deuterium Telescope

On 05/26/2018 03:23 AM, Vinand Prayag wrote: Hi Dan, The downconversion was the first idea that we had before Prof Inggs steered us towards the SNAPs. I made a quick costs overview: If each channel cost $100. Total cost for 48 is $4800. PCIe ADC with 16channels at 1MSPs will come at $500

Re: [casper] ADCs in CASPER

On 10/26/2020 10:38 AM, Jack Hickish wrote: Hi Gareth, On Mon, 26 Oct 2020 at 12:49, Gareth Callanan > wrote: Hi Casper Community Now that roach2 has been deprecated, I have been wondering where the CASPER community is heading in terms of future ADC