AW: gEDA-user: Contact reliability

["Helmut Zulus" <helmut.zulus@xxxxxx>]

just an idea...

for home-satellite-dish-cabling there are so called "F-Connectors" which
maintain reliable contact over decades even in outdoor condition. They can
handle frequencies up to 3 GHz. "microwelding" is done by the fact that they
also carry DC power for the converter which is located on the dish (about
200-600mA).
In Automotive Electronics where you have similar environment, it's quite
common to apply momentary DC current to a mechanical "cold switch action" by
the use of a PTC resistor to achieve microwelding.
Combining these, with some circuitry necessary for coupling and decoupling
your "payload" signal is, maybe a way to solve your problem...

regards
helmut.zulus@xxxxxx
 

-----Ursprüngliche Nachricht-----
Von: owner-geda-user@xxxxxxxx [mailto:owner-geda-user@xxxxxxxx] Im Auftrag
von Bert Douglas
Gesendet: Donnerstag, 20. Jänner 2005 03:22
An: geda-user@xxxxxxxx
Betreff: Re: gEDA-user: Contact reliability

Hi Cl,

These are links to components (or similar) which I suggested earlier. 
Sometimes a picture is worth 1000 words.


http://rocky.digikey.com/WebLib/Cinch/Web%20Photos/4-140.jpg

http://multimedia.mmm.com/mws/mediawebserver.dyn?ddddddNLXpsdyHedrHedddIG5P&;
g8gAw-

Note the ring terminals are long-barrel, brazed-seam, non-insulated.  By 
long barrel you have longer crimp region, stronger, lower resistance. 
Long means about 5 to 7 times the diameter of the wire.
There is a seam/joint in the barrel.  You want welded/brazed seam. 
Avoid ones with open crack in barrel.
The non-insulated ring terminals are to be preferred, because you can 
perform a better, more agressive type crimp.  This is kind of like the 
difference between biting with teeth, and biting with no teeth.