Re: [Discuss-gnuradio] Losing data during long collects

[Bob McGwier]

There is insufficient dynamic range in any GPS signal on any ordinary 
mortals GPS antenna to use more than 8 bits.

Bob


Chris Stankevitz wrote:
> Dan Halperin wrote:
> > > USRP's cfile utility cannot write my data without overruns, so I use 
> > > my own app which I have attached to this email in case anyone is 
> > > interested.  I will try Juha's recorder to see if it performs better.
> >
> > FWIW (maybe you've fixed the problem already), I would think that if 
> > this is the case then you're using the cfile script wrong. Are you 
> > using the '-s' switch (to halve the required disk bandwidth)?
>
> Hi Dan,
>
> Yes, I record the data as 16 bit shorts vs. 32 bit floats.  At 4Msps 
> complex data, this provides 16 megabytes per second which is within 
> the capabilities of my 4 disk RAID0 array.  Here are the results of 
> the bonnie++ benchmark which reports my drive can write at 58 
> megabytes per second:
>
> Version  1.03       ------Sequential Output------
>                     -Per Chr- --Block--
> Machine        Size K/sec %CP K/sec %CP
> cstankevitz-lapt 4G 34335  44 58313   5
>
>
> Chris
>
>
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