Re: Francophones

In message <MPG.41d36ed7f88483b798a01a@news.eternal-september.org>, Ralph Mowery <rmowery42@charter.net> writes

In article <nnd$23e91f0d$053bf96e@d25fd620e9918bf1>, noreply@ademu.nl
says...

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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.

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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.
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It is the N connector the center pin is different.

Indeed.  A 75 ohm N male (thin pin) inserted into a 50 ohm female (fatter receptacle) results in a non-connection. A 50 ohm N male (fat pin) inserted into a 75 ohm female (thin receptacle) results in a splayed (and usually wrecked for future use) receptacle.

 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.

--
Ian
Aims and ambitions are neither attainments nor achievements