[Elecraft] 50 and 75 ohm BNC Connectors

[John Huggins]

50 and 75 ohm BNC connectors fit each other fine differing only in the 
dielectric and width in the crimping area.  The mating areas are the 
same or so the makes of the connectors say.

As for the impedance bump, I would not worry about it one bit at video 
analog frequencies unless the cables were of tremendous length.

If the video signal gets stopped something else is terrible wrong.

John

Richard Kent wrote:

>While not an RF application. 75 ohm connector BNC and others are important
>to the digital video production environment. It is my understanding that a
>50 ohm barrel at the end of the correct length of coax will stop a digital
>video signal. I am in the process of installing a new digital switcher and I
>am watching connector, barrels, terminators impedances closely.
>
>Rick Kent
>WD8AJG K2 5296
>
>-----Original Message-----
>
>I've received a question about compatibility of 50 ohm BNC male 
>connectors with the 75 ohm female BNC connectors on Exetron's ADA 6 
>300MX video distribution amplifier.
>
>Amphenol makes the following statement about 50 and 75 ohm BNC connectors:
>
>"Two distinct types of 75 O BNC's are available, and both mate with each 
>other and with 50 O BNC's. Type 1 is designated 75 O BNC-T1 and provides 
>constant 75 O performance with low VSWR DC 4 GHz. Type 2 is designated 
>75 O BNC-T2 and is usable with low reflection DC - 1 GHz. For 
>applications above 1 GHz, Type 1 is recommended. "
>
>Unlike BNC connectors, however, please remember that 50 and 75 ohm Type 
>N connectors are not mechanically interchangeable and that physical 
>damage results when a 50 ohm N male connector is inserted into a 75 ohm 
>female N connector.
>
>I've added more details on using an ADA 6 300MX to distribute timing 
>signals in today's update. http://www.cliftonlaboratories.com/Updates.htm
>
>Jack K8ZOA
>www.cliftonlaboratories.com
>
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