Greetings all,
Not all 50 and 75 ohm BNCs are intermatable. On some the
centre pin, including the end point of the male centre pin
is narrower. The female 75, such as is found on many
oscilloscopes, expects the narrower pin and will be
excessivly splayed out if a 50 ohm plug is used. That may
not be visually obvious but repeated use may result in
non-contact with the correct 75ohm plug.
Been there.........
Regards 73 Alan G0HIQ
===========
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.
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