Re: gEDA-user: PCB antenna - short circuit

[Tamas Szabo <sza2king@xxxxxxxxxxx>]

Dave N6NZ wrote:
> John Griessen wrote:
>>> Tamas Szabo wrote:
>>   Since all part of the antenna
>>>> lines consist of pads, it seems to be a short circuit between the 
>>>> terminals 
>> Another thing to explore is about how in PCB pads
>> aren't handled just the
>> same DRC-wise as lines and no lines are
>> allowed in a footprint (as of now).
>>
>> What if you use two pad numbers, put a bunch of lines-that-become-pads
>> in your footprint, and let one pad number touch the other?
>>
>> Does PCB allow that?  Is that what you already did?
>>
>> John
>>
>> Here's two more work-arounds:
>>
>> 1.   Let the symbol be two pins, but same number.  Then everything else will be OK,
>> you just won't have a footprint the will check for installed backwards -- who cares?
> 
> Well, presumably the antenna driver is two different pins from a amp 
> that drives the two sides of the transmission line.  So it will still 
> appear to DRC as two nets being shorted.
> 
>> 2.   Don't use a symbol or footprint at all, just an area of layout saved and importable
>> where you like, and noted on schematics as a layout area by comments.  I like this way.
>> Your printed wiring antenna IS a layout zone.
> 
> Or....
> 
> 1. On the schematic, don't use a symbol, just connect driver pin 1 and 
> driver pin 2 with a short on the schematic.  You can draw the "short" on 
> the schematic in an artistic fashion to look like an antenna.
> 
> 2. In PCB, you will have to pull in the antenna footprint manually.  Or 
> I suppose you could have an unconnected symbol on the schematic have the 
> antenna as a footprint so that the netlister will include the symbol. 
> Or maybe even have an antenna symbol, and let it connect it's two pins 
> with a 'net' attribute that ties the two pins together.  Actually... 
> that last idea is probably best, but you'll have to test it... it's been 
> a while since I tried a snakey trick like that.
> 
> 3. In PCB, connect the driver pins to the antenna footprint normally. 
> The antenna footprint should have the same pin number on both ends.  It 
> will look like a short. DRC expects a short.  Everybody is now happy.
> 
> -dave
> 
> 
> 
>> John
>>
> 

First of all, thanks for the many suggestions.

Well, later I will try (some of) them, but I think, I keep the "orange" 
for now, to speed up the design.

> 
> 
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> 



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