RadioBanter - View Single Post - Connecting Two RF Connectors in Metal Enclosure

philo · December 12th 10, 06:25 PM posted to rec.radio.amateur.homebrew

On 12/12/2010 09:35 AM, J. Todd wrote:
In ,
says...
John Wjrw wrote:
Hello all,

I am trying to put a co-ax line through the wall of my shack. I purchased
two chassis mount N-type connectors a while ago, one for inside and one for
outside the shack. As you will know these connectors have a solderable
centre pin for the co-ax inner conductor and seem to rely on the chassis for
the outer connection.

My question is if I use a metal enclosure to mount these N connectors how do
I connect the centre pins together. Do I use co-ax with the braid
disconnected at both ends, or one end, or do I use wire, or just put the
chassis mount N-types to one side and buy some in-line N-types?

I am not too worried about the mechanics of putting the enclosure on the
wall.

Any help would be much appreciated.

You don't mention what frequency you are operating on; that makes
quite a bit of difference.

Also what the distance between the two connectors is.

Anything that is small compared to the wavelength of the signal you
are trying to transfer is not so critical.

So on 3.5 MHz you may be able to use a simple wire, while on 3.5 GHz
is is really important to maintain coaxiality.

You incur loss in each connector (.2dB?). I would run the co-ax
through the wall and then put the fitting on inside.

I'd skip that and run the coax through the wall with no fitting whatsoever