Source for RF "pass-through"?

Well there are FeedThru capacitors, and there are Feedthrus without capacitance, or should I say, minimal capacitance, maybe a few pF.

On Fri, 21 May 2004 13:57:20 -0700, Watson A.Name \Watt Sun - the Dark Remover\ wrote (in article ):

W/O is my preference.

Sources?

How are you planning to deal with the impedance discontinuity at the hole? If I was making one or two or these, I would pass teflon coax through the hole with a band of the outer insulation removed, and solder the braid to the wall.

Copper tape?

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I think what you're looking for is a bulkhead connector. Meant to pass RF through a metal wall.

The others are thinking feedthrough capacitor, I think, which is a way to feed DC or low freq signals through the metal wall, but not RF.

On Fri, 21 May 2004 18:21:36 -0700, Dave VanHorn wrote (in article ):

Yes, that describes what I intend to do.

Source?

On Fri, 21 May 2004 16:06:28 -0700, John Popelish wrote (in article ):

Let me ask for an expansion on that for a non-professional hobbiest-experimenter's point of view: the capacitance of the metal as the coax passes through will change the impedance of the coax?

As I understand it, you want to pass a 2.4 GHz signal through a metal wall.

If you pass a wire through a hole in a metal wall, there is an abrupt change in the impedance of that wire for high frequency waves traveling along the wire that will cause a big reflection at the hole. Only a fraction of the energy will pass through. If you pass a coax through the hole, without breaking the outer braid, the wave is not affected by the hole, even if the braid makes contact with the wall.

Am I understanding what you are trying to do?

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