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[linrad] Re: linrad setup error

Hi, Leif et al,
Knoppix Live DOES use a ramdisk. I do not know how large this generally is, but I believe Knoppix does some calculations when installing to decide how big to make this.
I have uploaded a new version of the OSS version of the Linrad Knoppix Live CD to the website: 

http://www.sm5bsz.com/w3sz/knoppixlink.htm
Interestingly [and unfortunately] with this version of the CD which uses Knoppix 3.8 and Linrad-01.34 and the latest OSS version, the soundcard selection routine in Linrad is unable to open 4 channels for input such as is necessary for two receive channels each with I/Q receive. I did not have this problem with the prior CD and do not know why this has occurred. It works OK for I/Q sampling of ONE receive channel. 

I will check into this as time permits.

73,

Roger
W3SZ
On Mon, 12 Dec 2005 03:57:04 -0500, leif@xxxxxxxxxx <leif@xxxxxxxxxx> wrote: 


Hi Alex,
after a Sunday afternoon passed in download ISO's and check them I was able to make a good CD_live of W3SZ version of Linrad and now my PC load all OK. The new problem I found is that when I am in the S mode and the program ask 
the parameters, I tried the suggested or to change, but always I receive
this message: "Speed far too slow. Try less demanding FFT! Press any key. 
This means that the first fft runs too slowly.
This is because you have selected a too narrow bandwidth that causes
a too large size for the fft - but since you have a PIII this should not
happen easily. My guess is that you ask for too much memory which
causes swapping to the hard disk. Execution then becomes really slow.....

There is a parameter "Use mlockall to prevent swapping?" in the general
parameters setup. (You can change it in par_userint with a text editor)

To minimize memory requirements, deselect second fft and AFC.
Set minimum fft1 storage time and minimum baseband storage time.
Once Linrad starts you will get a message on screen that shows how
large data areas you allocate. 256MB should be plenty, but maybe
some other process is running that uses up memory or cpu time?
I do not know anything about the Knoppix live CD. Maybe it uses
a RAM disk?

73

Leif / SM5BSZ
Accept...." I made a lot of test but I've always the same answer: I see the PC making calculations but at the end I have always this answer. Do I make 
any error? Or not?
I read all the mailing list message but I did not find any similar question, 
and moreover I didn't find any error message list in order to understand
what can I do to solve this?
May I have any help from someone that had the same?

I remember my PC is PIII 870 MHz CPU, 256 RAM, video Matrox 4000 16 Mb.

Thanks in advance from a newbie/Elmer on this side....

Alex I0SKK



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--
Roger Rehr
W3SZ
http://www.qsl.net/w3sz

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