<s>
The	O
TNC	B-Protocol
connector	I-Protocol
(	O
acronym	O
of	O
"	O
Threaded	O
Neill	O
–	O
Concelman	O
"	O
)	O
is	O
a	O
threaded	O
version	O
of	O
the	O
BNC	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
It	O
has	O
better	O
performance	O
than	O
the	O
BNC	B-Protocol
connector	I-Protocol
at	O
microwave	O
frequencies	O
.	O
</s>
<s>
Invented	O
in	O
the	O
late	O
1950s	O
and	O
named	O
after	O
Paul	O
Neill	O
of	O
Bell	O
Labs	O
and	O
Carl	O
Concelman	O
of	O
Amphenol	O
,	O
the	O
TNC	B-Protocol
connector	I-Protocol
has	O
been	O
employed	O
in	O
a	O
wide	O
range	O
of	O
radio	O
and	O
wired	O
applications	O
.	O
</s>
<s>
The	O
TNC	B-Protocol
connector	I-Protocol
features	O
a	O
7/16	O
"	O
-28	O
thread	O
,	O
not	O
to	O
be	O
confused	O
with	O
a	O
7/16	B-Protocol
DIN	I-Protocol
connector	I-Protocol
,	O
which	O
is	O
the	O
diameter	O
of	O
the	O
mating	O
surfaces	O
as	O
specified	O
in	O
millimeters	O
.	O
</s>
<s>
Reverse-polarity	O
TNC	O
(	O
RP-TNC	B-Protocol
,	O
sometimes	O
RTNC	O
)	O
is	O
a	O
variation	O
of	O
the	O
TNC	O
specification	O
which	O
reverses	O
the	O
polarity	O
of	O
the	O
interface	O
.	O
</s>
<s>
Because	O
they	O
were	O
not	O
readily	O
available	O
,	O
RP-TNC	B-Protocol
connectors	O
have	O
been	O
widely	O
used	O
by	O
Wi-Fi	O
equipment	O
manufacturers	O
to	O
comply	O
with	O
specific	O
local	O
regulations	O
,	O
such	O
as	O
those	O
from	O
the	O
FCC	O
,	O
which	O
are	O
designed	O
to	O
prevent	O
consumers	O
from	O
connecting	O
antennas	O
which	O
exhibit	O
gain	O
and	O
therefore	O
breach	O
compliance	O
.	O
</s>
<s>
The	O
FCC	O
considered	O
that	O
the	O
RP-TNC	B-Protocol
was	O
acceptable	O
in	O
preventing	O
consumers	O
changing	O
the	O
antenna	O
;	O
but	O
by	O
2000	O
it	O
regarded	O
them	O
as	O
readily	O
available	O
,	O
though	O
delaying	O
its	O
ruling	O
indefinitely	O
.	O
</s>
<s>
As	O
of	O
2013	O
,	O
leading	O
manufacturers	O
are	O
still	O
using	O
RP-TNC	B-Protocol
connectors	O
on	O
their	O
Wi-Fi	O
equipment	O
.	O
</s>
<s>
Plug	O
on	O
the	O
female	O
connector	O
and	O
receptacle	O
on	O
the	O
male	O
when	O
dealing	O
with	O
RP-TNC	B-Protocol
.	O
</s>
<s>
The	O
TNCA	O
connector	O
is	O
a	O
variant	O
of	O
the	O
TNC	B-Protocol
connector	I-Protocol
specified	O
in	O
MIL-STD-348	O
designed	O
to	O
provide	O
an	O
air	O
gap	O
in	O
the	O
dielectric	O
region	O
between	O
the	O
male	O
and	O
female	O
connectors	O
.	O
</s>
<s>
The	O
socket	O
version	O
of	O
the	O
TNCA	O
connector	O
is	O
nearly	O
identically	O
to	O
the	O
standard	O
TNC	B-Protocol
connector	I-Protocol
,	O
while	O
the	O
pin	O
contact	O
version	O
provides	O
the	O
air	O
cavity	O
differentiating	O
it	O
from	O
a	O
standard	O
TNC	B-Protocol
connector	I-Protocol
,	O
as	O
such	O
TNCA	O
connectors	O
are	O
mechanically	O
compatible	O
and	O
matable	O
with	O
standard	O
conjugate	O
TNC	B-Protocol
connectors	I-Protocol
.	O
</s>
<s>
Most	O
TNC	B-Protocol
connectors	I-Protocol
are	O
50-ohm	O
type	O
even	O
when	O
used	O
with	O
coaxial	O
cable	O
of	O
other	O
impedances	O
,	O
but	O
a	O
75-ohm	O
series	O
is	O
also	O
available	O
,	O
providing	O
a	O
good	O
SWR	O
to	O
about	O
1GHz	O
.	O
</s>
