<s>
The	O
UHF	B-Protocol
connector	I-Protocol
is	O
a	O
name	O
for	O
a	O
threaded	O
RF	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
The	O
connector	O
design	O
was	O
invented	O
in	O
the	O
1930s	O
for	O
use	O
in	O
the	O
radio	O
industry	O
,	O
and	O
is	O
a	O
shielded	O
form	O
of	O
the	O
"	O
banana	B-Protocol
plug	I-Protocol
"	O
.	O
</s>
<s>
It	O
is	O
a	O
widely	O
used	O
standard	O
connector	O
for	O
HF	B-Algorithm
transmission	O
lines	O
on	O
full-sized	O
radio	O
equipment	O
,	O
with	O
BNC	B-Protocol
connectors	I-Protocol
predominating	O
for	O
smaller	O
,	O
hand-held	O
equipment	O
.	O
</s>
<s>
Today	O
,	O
Ultra	O
high	B-Algorithm
frequency	I-Algorithm
(	O
UHF	O
)	O
instead	O
refers	O
to	O
frequencies	O
between	O
300MHz	O
and	O
3GHz	O
and	O
the	O
range	O
of	O
frequencies	O
formerly	O
known	O
as	O
UHF	O
is	O
now	O
called	O
"	O
VHF	B-Algorithm
"	O
.	O
</s>
<s>
Testing	O
reveals	O
post	O
WWII	O
connectors	O
designs	O
,	O
such	O
as	O
N	B-Protocol
connector	I-Protocol
and	O
BNC	B-Protocol
connector	I-Protocol
are	O
electrically	O
superior	O
to	O
the	O
'	O
UHF	O
 '	O
connector	O
for	O
modern	O
UHF	O
frequencies	O
.	O
</s>
<s>
Other	O
testing	O
reveals	O
one	O
UHF	B-Protocol
connector	I-Protocol
sample	O
shows	O
negligible	O
effect	O
on	O
frequencies	O
up	O
to	O
435	O
MHz	O
.	O
</s>
<s>
The	O
most	O
popular	O
cable	O
plug	O
and	O
corresponding	O
chassis-mount	O
socket	O
carry	O
the	O
old	O
Signal	O
Corps	O
nomenclatures	O
PL-259	B-Protocol
(	O
plug	O
)	O
and	O
SO-239	B-Protocol
(	O
socket	O
)	O
.	O
</s>
<s>
A	O
double-ended	O
SO-239	B-Protocol
connector	O
is	O
designated	O
as	O
an	O
SO-238	O
.	O
</s>
<s>
PL-259	B-Protocol
,	O
SO-239	B-Protocol
,	O
PL-258	O
,	O
and	O
several	O
other	O
related	O
military	O
references	O
refer	O
to	O
one	O
specific	O
mechanical	O
design	O
collectively	O
known	O
as	O
the	O
UHF	B-Protocol
Connector	I-Protocol
.	O
</s>
<s>
In	O
some	O
countries	O
,	O
for	O
example	O
in	O
Israel	O
,	O
the	O
term	O
'	O
PL	O
connector	O
 '	O
is	O
confusingly	O
associated	O
rather	O
with	O
the	O
analog	O
phone	B-Device
connector	I-Device
.	O
</s>
<s>
By	O
design	O
,	O
all	O
connectors	O
in	O
the	O
UHF	B-Protocol
connector	I-Protocol
family	O
mate	O
using	O
the	O
inch	O
24tpi	O
threaded	O
shell	O
for	O
the	O
shield	O
connection	O
and	O
an	O
approximately	O
0.156inch-diameter	O
(	O
4mm	O
)	O
pin	O
and	O
socket	O
for	O
the	O
inner	O
conductor	O
.	O
</s>
<s>
Similar	O
connectors	O
(	O
M	O
connectors	O
)	O
with	O
an	O
incompatible	O
16mm	O
diameter	O
,	O
1mm	O
metric	O
thread	O
have	O
been	O
produced	O
,	O
but	O
these	O
are	O
not	O
standard	O
UHF	B-Protocol
connectors	I-Protocol
by	O
definition	O
.	O
</s>
<s>
UHF	B-Protocol
connectors	I-Protocol
have	O
a	O
non-constant	O
surge	O
impedance	O
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
UHF	B-Protocol
connectors	I-Protocol
are	O
generally	O
usable	O
through	O
HF	B-Algorithm
and	O
the	O
lower	O
portion	O
of	O
what	O
is	O
now	O
known	O
as	O
the	O
VHF	B-Algorithm
frequency	O
range	O
.	O
</s>
<s>
Despite	O
the	O
name	O
,	O
the	O
UHF	B-Protocol
connector	I-Protocol
is	O
rarely	O
used	O
in	O
commercial	O
applications	O
for	O
today	O
's	O
UHF	O
frequencies	O
,	O
as	O
the	O
non-constant	O
surge	O
impedance	O
creates	O
measurable	O
electrical	O
signal	O
reflections	O
above	O
100MHz	O
.	O
</s>
<s>
A	O
typical	O
SO-239	B-Protocol
UHF	O
female	O
,	O
properly	O
hooded	O
,	O
has	O
an	O
impedance	O
bump	O
of	O
about	O
35ohms	O
.	O
</s>
<s>
Many	O
VHF/UHF	O
amateur	O
operators	O
use	O
special	O
UHF	O
females	O
that	O
maintain	O
a	O
50ohm	O
surge	O
impedance	O
.	O
</s>
<s>
Some	O
samples	O
of	O
UHF	B-Protocol
connectors	I-Protocol
can	O
handle	O
RF	O
peak	O
power	O
levels	O
well	O
over	O
onekilowatt	O
based	O
on	O
the	O
voltage	O
rating	O
of	O
500Volts	O
peak	O
.	O
</s>
<s>
In	O
practice	O
,	O
some	O
UHF	B-Protocol
connector	I-Protocol
products	O
will	O
handle	O
over	O
4kV	O
peak	O
voltage	O
.	O
</s>
<s>
UHF	B-Protocol
connectors	I-Protocol
are	O
standard	O
on	O
HF	B-Algorithm
amateur	O
amplifiers	O
rated	O
at	O
1500+Watts	O
output	O
.	O
</s>
<s>
UHF	B-Protocol
connectors	I-Protocol
are	O
generally	O
limited	O
by	O
cable	O
heating	O
rather	O
than	O
connector	O
failure	O
.	O
</s>
<s>
The	O
UHF	B-Protocol
connector	I-Protocol
is	O
not	O
weatherproof	O
.	O
</s>
<s>
In	O
many	O
applications	O
,	O
UHF	B-Protocol
connectors	I-Protocol
were	O
replaced	O
by	O
designs	O
that	O
have	O
a	O
more	O
uniform	O
surge	O
impedance	O
over	O
the	O
length	O
of	O
the	O
connector	O
,	O
such	O
as	O
the	O
N	B-Protocol
connector	I-Protocol
and	O
the	O
BNC	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
UHF	B-Protocol
connectors	I-Protocol
are	O
still	O
widely	O
used	O
in	O
amateur	O
radio	O
,	O
Citizens	B-Application
Band	I-Application
radio	I-Application
,	O
and	O
marine	O
VHF	B-Algorithm
radio	O
applications	O
.	O
</s>
