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From: Ralph Mowery <rmowery42@charter.net>
Newsgroups: sci.electronics.design,sci.electronics.repair
Subject: Re: Francophones
Date: Mon, 23 Dec 2024 12:58:36 -0500
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In article <nnd$23e91f0d$053bf96e@d25fd620e9918bf1>, noreply@ademu.nl 
says...
> 
> On 2024-12-23 16:22, Ian Jackson wrote:
> > For many purposes you can ignore the difference between the 50 and 75 ohm impedances (and 60 if you ever come across any). 
> > However, be very aware only BNC 50 and 75 ohm connectors are mutually mechanically mateable (yes - they really are!). I don't know if any others that are.
> 
> Not recommended.
> The center pin differs, a 50 Ohm BNC pin is thicker and may damage a 75 ohm BNC.
> I'm cautious, most of my below 1 GHz equipment is 75 Ohms (from CATV company), the rest is 50.
> 
> 
> 

It is the N connector the center pin is different.  The BNC pin is the 
same.  It is the ammount of dialectric (insulation) in the BNC that 
makes it a 75 or 50 ohm connector.