Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
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)
Organization: A noiseless patient Spider
Lines: 45
Message-ID: <v43vk8$3dhg7$2@dont-email.me>
References: <v426ri$2ni84$1@dont-email.me>
	<f1d96jtvb2pokgermt7fqt751ed9gpjfcn@4ax.com> <v42jgp$2gbeq$1@dont-email.me>
	<v42ju0$2gbeq$2@dont-email.me> <97s96j5fajs26f6eg9odqs48skgghoson5@4ax.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Sun, 09 Jun 2024 12:19:52 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="d4ac345ff05c2404d7e3496200634bde";
	logging-data="3589639"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+aROBFDsX7UglrAH5QW9QW1JtXCwX6xIA="
User-Agent: Pan/0.149 (Bellevue; 4c157ba)
Cancel-Lock: sha1:d8UJ9gREoSfTgBIfpXARTAg33gE=
Bytes: 2540

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.