Re: RF Connector Type ID

On 9/06/2024 8:19 pm, Cursitor Doom wrote:

On Sat, 08 Jun 2024 17:06:18 -0700, john larkin wrote:
 

On Sat, 8 Jun 2024 22:54:07 +0100, John R Walliker
<jrwalliker@gmail.com> wrote:
>

On 08/06/2024 22:47, John R Walliker wrote:

On 08/06/2024 20:43, john larkin wrote:

On Sat, 8 Jun 2024 18:10:59 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:

<snip>

Shining Star makes nice cheap edge-launch SMAs and SMBs. A proper pad
stack keeps things 50 ohms.

 Could you possibly expand on that last sentence, please? I've never
encountered a 'pad stack' before.

You need to manage the transition between 50R transmission line in the cable and the 50R trace in the board. Traces buried in the board can be non-dispersive, and you can work out how wide the trace has to be and how far from ground planes that carry the return current to get you 50R.
A connector on the edge of the board needs special care. The pad stack is a collection of metalised areas in the edge of the board that provide a more-or-less seamless transition.
--
Bill Sloman, Sydney
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