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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: RF Connector Type ID
Date: Sat, 08 Jun 2024 17:06:18 -0700
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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.