X-Authentication-Warning: delorie.com: mail set sender to geda-help-bounces using -f X-Recipient: geda-help AT delorie DOT com Subject: Re: [geda-help] Unmasked Track To: geda-help AT delorie DOT com References: <671601480 DOT 759382 DOT 1478708546169 DOT ref AT mail DOT yahoo DOT com> <671601480 DOT 759382 DOT 1478708546169 AT mail DOT yahoo DOT com> From: Carlos Moreno Message-ID: <3805c079-758b-9b44-fcfc-44c73d1b79fd@mochima.com> Date: Wed, 9 Nov 2016 12:01:26 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <671601480.759382.1478708546169@mail.yahoo.com> Content-Type: multipart/alternative; boundary="------------E70E19D2DA69D5CE5E2C415B" Reply-To: geda-help AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-help AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk This is a multi-part message in MIME format. --------------E70E19D2DA69D5CE5E2C415B Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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 -- --------------E70E19D2DA69D5CE5E2C415B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
On 16-11-09 11:22 AM, SAMIUDDHIN (engineersamiuddhin AT yahoo DOT in) [via geda-help AT delori= e.com] wrote:
Dear Sir,<= /span>

=C2=A0=C2=A0=C2=A0= How to remove/clear the soldermask over the track or polygons to create PCB trace antenna?
=C2=A0

I don't think you'd want to remove soldermask for a
trace to behave as an antenna;=C2=A0 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.=C2=A0 There is the tutorial on creating footprints;
but the short story is:=C2=A0 select the trace(s) that you
want to be part of the antenna, and just go to the
menu=C2=A0 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.=C2=A0 There may be a way to do it from the
application's interface, but I'm not familiar with
any.=C2=A0 For example, I get this:

Element["" "" "" "" 110.00mil 40.00mil 0.0000 0.0000 0 100 ""]
(
=C2=A0=C2=A0=C2=A0 Pad[240.00mil 190.00mil 240.00mil 260.00mil 30.00m= il 20.00mil 50.00mil "" "1" "edge2"]
=C2=A0=C2=A0=C2=A0 Pad[210.00mil 260.00mil 240.00mil 260.00mil 30.00m= il 20.00mil 50.00mil "" "2" "edge2"]
=C2=A0=C2=A0=C2=A0 Pad[210.00mil 120.00mil 210.00mil 260.00mil 30.00m= il 20.00mil 50.00mil "" "3" ""]
=C2=A0=C2=A0=C2=A0 ....

(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.=C2=A0 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-proje= ct.org/geda:pcb-quick_reference#footprint_quick_reference

Hope this helps,
Carlos
--

--------------E70E19D2DA69D5CE5E2C415B--