Re: Careful with BNC-to-SO239 adapters
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I was wrong in claiming that the outer conductor of the male BNC connector always has the same diameter for the 2 types. :o)
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For the 75ohm version, the diameter of both inner and outer conductor are different in the male BNC !
Physical compatibility is somewhat ensured since the outer conductor material is made thinner.
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The difference in the center-pin is ~0,3mm, but they should be compatible. At least a 75ohm BNC Male -> 50ohm BNC Female.
However, I wouldn't recommend you use a 50ohm BNC male -> 75ohm BNC Female.
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This is possibly why some 75ohm "quality" BNC connectors are also made with a 1.6mm center pin. ( Although this deviates from the standard. )
example:
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The full explanation and some pictures can be seen here:
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That said. You don't have to look far on ebay/aliexpress to find "non-standard" 75ohm hybrid versions ( Lets call them Frankenstein-BNC's ), where the difference is only a thinner inner conductor. :(
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Lets just stay away from these cheap unbranded versions. :D
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