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Streaky/split polygon ground plane

autodeskguest

Searching the newsgroup for an answer to this one didn't turn up any

matches (but I think I know a lot more about ground planes/polygons now!).

 

I have designed a double-sided board with ground planes on both sides

of the board.  When I print (as in File->print) the board with output

to a Postscript file, then view it (using evince - I'm running Ubuntu

by the way), I see both the top and bottom ground planes have small

horizontal slits in them.  A photo is worth 1000 words as they say.

 

Notice that the edge of the polygon is never affected, just the

inside.  Other signals (the regular looking traces in the image)

appear just fine as well.  The width of the polygon affects the

spacing of the streaking.  It's like there isn't any overlap of the

lines used to create the solid fill, and sometimes we see 'through'

between the lines.

 

I have also tried printing to a 'PDF printer' - a driver that acts

like a printer to the app, but redirects output to a file in PDF

format.  Using xpdf to view that file also shows the streaking effect.

 

This doesn't seem to affect the CAM files.  I have viewed those using

ViewMate without any streaking apparent.

 

All this has arisen because I wish to send a PDF of my layout to

someone for checking.  They don't run Eagle so I need some image

format that they can read.  I suspect I'll get a ribbing from them for

not running Protel; grr!

 

Any ideas how to stop this odd phenomenon would be appreciated.

 

Photo attached (hopefully).

 

-Martin

 

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  • On Mon, 12 May 2008 Martin van den Nieuwelaar wrote saying :

     

    So what OS are you running Robert?  I thought about trying all this

    under Windows, but setting it all up was going to be some work (mainly

    due to security restrictions at my work).

     

    Nearly all my Eagle work is done on Gentoo Linux, but I've played with a

    Windows version in the past. I don't actually remember whether the

    problem happened with that.

     

    Indeed, changing to hatched and back doesn't help for me either, but I

    have also fiddled with the width/isolate/spacing settings without

    managing to remove the problem.

     

    That's a shame.

     

    Now I come to think of it, I had one design that showed the problem if

    printed directly on Linux, but not if I printed to a file and took that

    to somebody else's printer. I don't recall for certain whether that was

    a Windows box or a Mac (there was even a NetBSD server in the room, but

    I don't think I used that).

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of this | Windows NT crashed.

    message are purely   | I am the Blue Screen of Death.

    my opinion. Don't    | No one hears your screams.

    believe a word.      |

     

Reply

  • On Mon, 12 May 2008 Martin van den Nieuwelaar wrote saying :

     

    So what OS are you running Robert?  I thought about trying all this

    under Windows, but setting it all up was going to be some work (mainly

    due to security restrictions at my work).

     

    Nearly all my Eagle work is done on Gentoo Linux, but I've played with a

    Windows version in the past. I don't actually remember whether the

    problem happened with that.

     

    Indeed, changing to hatched and back doesn't help for me either, but I

    have also fiddled with the width/isolate/spacing settings without

    managing to remove the problem.

     

    That's a shame.

     

    Now I come to think of it, I had one design that showed the problem if

    printed directly on Linux, but not if I printed to a file and took that

    to somebody else's printer. I don't recall for certain whether that was

    a Windows box or a Mac (there was even a NetBSD server in the room, but

    I don't think I used that).

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of this | Windows NT crashed.

    message are purely   | I am the Blue Screen of Death.

    my opinion. Don't    | No one hears your screams.

    believe a word.      |

     

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