Re: [time-nuts] disciplining sound card

2012-07-06 Thread Tristan Steele
Another option is to do it yourself, it is one of my projects that is currently in progress. I have some early information at: http://electronics.ozonejunkie.com/category/electronics/time/10mhzaudio/ I am aware that the jitter will not be all that low, but I was more interested in longer term s

Re: [time-nuts] Experience with THS788 from TI?

2012-03-21 Thread Tristan Steele
Hi, The NIM Negative pulse is indeed problematic when trying to interface to FPGA logic! The solution I have used in the past is a board based around a Maxim MAX9601[1] acting as a comparator on the incoming NIIM pulse, and configuring the output for connection to the FPGA. Judging by the result

Re: [time-nuts] GPS SDR

2012-02-01 Thread Tristan Steele
Hi All, I've been lurking here for a while, learning lots - but I think I may be able to contribute something to this discussion. I have been looking at SDR GPS reception for a while, and have a number of ideas as to how to go about this process. My first point of call is the layout of a board u

Re: [time-nuts] From Sundials to Atomic Clocks

2011-09-08 Thread Tristan Steele
Hi Randall, Thanks for that! It finally worked. Tristan On 09/09/2011, at 8:32, Randall Prentice wrote: > Have uploaded a copy in NZ. > > http://prento.homelinux.net/1796.pdf > > Couldn't download off TelstraClear, had to use Actrix links (DNS didn't > resolve properly). > > Regards >

Re: [time-nuts] From Sundials to Atomic Clocks

2011-09-08 Thread Tristan Steele
Yep, I can't get it either - and I am also in Australia, so I think there might be something in that. Is there any chance someone could mirror it on a server accessible from Down Under. :-) Thanks! Tristan On 09/09/2011, at 7:31, mike cook wrote: > Le 08/09/2011 23:03, Ken , VK7KRJ a écri

Re: [time-nuts] Variation in Radioactive Decay Rate with Solar Activity

2011-08-03 Thread Tristan Steele
Hi All, I know that I'm not a regular around here - but just a few things to consider in this discussion. Whilst measuring the rate of decay in a single detector signal is representative of the decay rate of an isotope, the errors associated with doing so are non trivial. In addition to this, ca

Re: [time-nuts] time interval with 10 ps resolution using cheap FPGA ?

2011-03-10 Thread Tristan Steele
I can't really add much to the questions - but I am very interested in the answer! Tristan On 11 March 2011 16:33, beale wrote: > I was interested to see this 2009 Fermilab paper which claims a 10 ps (RMS) > timing resolution in a TDC (time to digital converter) implented in the > Altera Cyclon

Re: [time-nuts] counter

2011-01-30 Thread Tristan Steele
Hi Don, At the risk of speaking out of turn, and not knowing too much about this project (I'm new here!) have you considered something like these boards: http://www.gadgetfactory.net/index.php?main_page=index&cPath=1&zenid=d282dce6c5b0acfe45c1377315b2734c They use the Spartan 3E chips, like alot