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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: RF Connector Type ID
Date: Sun, 9 Jun 2024 10:19:52 -0000 (UTC)
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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:
>>>>
>>>>> Gentlemen,
>>>>>
>>>>> Can anyone identify these connectors? HP use 'em an awful lot for
>>>>> interconnecting the boards of their analyzers to route 50 ohm RF
>>>>> signals around the various inside sections.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> CD.
>>>>>
>>>>> https://disk.yandex.com/i/LQ1ytGUQCf7OTw
>>>>
>>>> Probably SMBs.
>>> 
>>> +1
>>> 
>>> John
>>> 
>>Most of the connectors in the image look like SMB which is a "click on"
>>push fit connector and is cylindrical at the end.  A few which have a
>>hex profile at the end may be SMC which is a threaded connector.
>>SMA is threaded and a bit larger, but has the best high frequency
>>performance of them all.
>>
>>John
> 
> We like SMBs because that are quick to mate and un-mate without tools, 
> so can be mounted very close together. They work fine to 6 or 8 GHz,
> about what you can do with discretes on FR4.
> 
> 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.