On 6/26/18 6:37 AM, Zivney, Terry wrote:
Jim Lux said:
The UHF connector has a larger diameter center pin (0.156") than the N
(0.1197"), so its current handling capability is (slightly) higher.
Actually, the current handling interface of the N connector is a BNC pin, which
is much smaller
than the UHF connector. In fact, an N male connector will plug perfectly into
a BNC female
tee connector - done many times in a lab setting.
Actually not - the center conductor in an N is 0.120" - you might be
thinking of the pointy locator pin in the middle (0.063"), but in a
"properly mated" N connector, that's not carrying any power.
In a BNC plug, the center pin is 0.053" in diameter (slightly smaller
than the locator on an N) although i confess, having just looked through
a variety of drawings on google (BNC dimension image), there is a HUGE
variation. Just like in an N connector, you're counting on the mating
surface at the shoulder of that pin to carry the RF current (and set the
impedance) (typically 0.081 to 0.087") and that's about 70% of the size
of the N connector's center pin
http://www.rfacsolutions.com/rf-connectors/bnc/ has a drawing
Interestingly, the Amphenol drawing at
https://www.amphenolrf.com/connectors/bnc.html
doesn't even show the diameter of the center pin (or the socket)
So the N plug will "sort of" mate with a BNC jack - it's obviously not
constant impedance, and the large N locator pin might bend your BNC jack
springs.
Adapters are cheap - a lot cheaper than replacing the connector on your
test equipment, probably.
(and let's not get into mismating K and SMA)
How do you feel about high power in BNC connectors? 8^)
Terry N4TZ
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