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Mail Archives: geda-help/2016/11/09/12:01:51

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Subject: Re: [geda-help] Unmasked Track
To: geda-help AT delorie DOT com
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<671601480 DOT 759382 DOT 1478708546169 AT mail DOT yahoo DOT com>
From: Carlos Moreno <moreno+geda-help AT mochima DOT com>
Message-ID: <3805c079-758b-9b44-fcfc-44c73d1b79fd@mochima.com>
Date: Wed, 9 Nov 2016 12:01:26 -0500
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On 16-11-09 11:22 AM, SAMIUDDHIN (engineersamiuddhin AT yahoo DOT in) [via 
geda-help AT delorie DOT com] wrote:
> Dear Sir,
>
>     How to remove/clear the soldermask over the track or polygons to 
> create PCB trace antenna?

I don't think you'd want to remove soldermask for a
trace to behave as an antenna;  the soldermask
material should be essentially transparent to the
EM radiation.

With that said, assuming that you do have a good
reason to do that, you can simply convert the traces
to elements.  There is the tutorial on creating footprints;
but the short story is:  select the trace(s) that you
want to be part of the antenna, and just go to the
menu  Select -> Convert Selection to Element.

If you want to adjust the clearance (the distance
from the trace edge to the soldermask edge), you
can certainly do it by manually editing the PCB
file.  There may be a way to do it from the
application's interface, but I'm not familiar with
any.  For example, I get this:

Element["" "" "" "" 110.00mil 40.00mil 0.0000 0.0000 0 100 ""]
(
     Pad[240.00mil 190.00mil 240.00mil 260.00mil 30.00mil 20.00mil 
50.00mil "" "1" "edge2"]
     Pad[210.00mil 260.00mil 240.00mil 260.00mil 30.00mil 20.00mil 
50.00mil "" "2" "edge2"]
     Pad[210.00mil 120.00mil 210.00mil 260.00mil 30.00mil 20.00mil 
50.00mil "" "3" ""]
     ....

(if you have an older version, you may see 24000 19000 ... )

The last numeric value (the 50.00mil) is the soldermask
clearance --- it corresponds to the thickness (the fifth
value, 30.00mil in the above example) plus twice the
copper-to-soldermask distance.  In the above example,
I could change 50.00mil to 36.00mil to get a 3mil space
between the copper and the soldermask edge.

For more details, you can see
http://wiki.geda-project.org/geda:pcb-quick_reference#footprint_quick_reference

Hope this helps,
Carlos
--


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pe">
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    <div class=3D"moz-cite-prefix">On 16-11-09 11:22 AM, SAMIUDDHIN
      (<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:engineersamiu=
ddhin AT yahoo DOT in">engineersamiuddhin AT yahoo DOT in</a>) [via <a class=3D"moz-txt=
-link-abbreviated" href=3D"mailto:geda-help AT delorie DOT com">geda-help AT delori=
e.com</a>] wrote:<br>
    </div>
    <blockquote cite=3D"mid:671601480 DOT 759382 DOT 1478708546169 AT mail DOT yahoo DOT com=
"
      type=3D"cite">
      <div style=3D"color:#000; background-color:#fff; font-family:Courie=
r
        New, courier, monaco, monospace, sans-serif;font-size:16px">
        <div id=3D"yui_3_16_0_ym19_1_1478708291070_6851"><span>Dear Sir,<=
/span></div>
        <div id=3D"yui_3_16_0_ym19_1_1478708291070_6858"><span><br>
          </span></div>
        <div id=3D"yui_3_16_0_ym19_1_1478708291070_6867"><span
            id=3D"yui_3_16_0_ym19_1_1478708291070_6866">=C2=A0=C2=A0=C2=A0=
 How to
            remove/clear the soldermask over the track or polygons to
            create PCB trace antenna?</span></div>
        <div id=3D"yui_3_16_0_ym19_1_1478708291070_6878">=C2=A0</div>
      </div>
    </blockquote>
    <br>
    I don't think you'd want to remove soldermask for a <br>
    trace to behave as an antenna;=C2=A0 the soldermask <br>
    material should be essentially transparent to the <br>
    EM radiation.<br>
    <br>
    With that said, assuming that you do have a good <br>
    reason to do that, you can simply convert the traces <br>
    to elements.=C2=A0 There is the tutorial on creating footprints; <br>
    but the short story is:=C2=A0 select the trace(s) that you <br>
    want to be part of the antenna, and just go to the <br>
    menu=C2=A0 Select -&gt; Convert Selection to Element.<br>
    <br>
    If you want to adjust the clearance (the distance <br>
    from the trace edge to the soldermask edge), you <br>
    can certainly do it by manually editing the PCB <br>
    file.=C2=A0 There may be a way to do it from the <br>
    application's interface, but I'm not familiar with <br>
    any.=C2=A0 For example, I get this:<br>
    <br>
    Element["" "" "" "" 110.00mil 40.00mil 0.0000 0.0000 0 100 ""]<br>
    (<br>
    =C2=A0=C2=A0=C2=A0 Pad[240.00mil 190.00mil 240.00mil 260.00mil 30.00m=
il 20.00mil
    50.00mil "" "1" "edge2"]<br>
    =C2=A0=C2=A0=C2=A0 Pad[210.00mil 260.00mil 240.00mil 260.00mil 30.00m=
il 20.00mil
    50.00mil "" "2" "edge2"]<br>
    =C2=A0=C2=A0=C2=A0 Pad[210.00mil 120.00mil 210.00mil 260.00mil 30.00m=
il 20.00mil
    50.00mil "" "3" ""]<br>
    =C2=A0=C2=A0=C2=A0 ....<br>
    <br>
    (if you have an older version, you may see 24000 19000 ... )<br>
    <br>
    The last numeric value (the 50.00mil) is the soldermask <br>
    clearance --- it corresponds to the thickness (the fifth <br>
    value, 30.00mil in the above example) plus twice the <br>
    copper-to-soldermask distance.=C2=A0 In the above example, <br>
    I could change 50.00mil to 36.00mil to get a 3mil space <br>
    between the copper and the soldermask edge.<br>
    <br>
    For more details, you can see <br>
<a class=3D"moz-txt-link-freetext" href=3D"http://wiki.geda-project.org/g=
eda:pcb-quick_reference#footprint_quick_reference">http://wiki.geda-proje=
ct.org/geda:pcb-quick_reference#footprint_quick_reference</a><br>
    <br>
    Hope this helps,<br>
    Carlos<br>
    --<br>
    <br>
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