[time-nuts] TNC connectors

Chuck Harris cfharris at erols.com
Tue Jun 23 11:54:02 UTC 2009

Dave Baxter wrote:

> Doing that with BNC's will lead to a flaky connection, as the centre pin
> on the 75r ones is much smaller.  The other way round (50r plug into 75r
> socket) will damage the socket.  As TNC's are very similar to BNC's ???

You are thinking of the incompatibility between 50 ohm and 75 ohm *N*

75 ohm BNC are use the same center pin hardware as 50 ohm BNC.  The only
difference is in the white plastic (teflon) insulator.  In the 50 ohm BNC,
the center insulator goes all the way to the tip of the center pin.  In
the 75 ohm BNC, the center insulator is abbreviated.

HP/Agilent uses 75 OHM BNC's on several of its devices that have switchable
impedances.  For example, the 3586C.

-Chuck Harris

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