RE: gEDA-user: Contact reliability

["Robert Thorpe" <Robert.Thorpe@xxxxxxxxxxxx>]

For RF, cellular base station installations use 7-16th connectors.  These are very robust, though expensive.
Unlike most types of coax connector the coax outer is not conducted only by the outer of the connector.
In base station installations they will mostly be covered in heat-shrink though.

> -----Original Message-----
> From: owner-geda-user@xxxxxxxx 
> [mailto:owner-geda-user@xxxxxxxx] On Behalf Of Helmut Zulus
> Sent: 20 January 2005 09:16
> To: geda-user@xxxxxxxx
> Subject: AW: gEDA-user: Contact reliability
> 
> 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?ddddddNLXpsdy
> HedrHedddIG5P&
> 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.
> 
> 
> 
> 
>