[Elecraft] 50 and 75 ohm BNC Connectors

[Jack Smith]

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 Ω BNC's are available, and both mate with each 
other and with 50 Ω BNC's. Type 1 is designated 75 Ω BNC-T1 and provides 
constant 75 Ω performance with low VSWR DC 4 GHz. Type 2 is designated 
75 Ω 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