<s>
The	O
APC-7	B-Protocol
connector	I-Protocol
(	O
also	O
referred	O
to	O
as	O
a	O
7	O
mm	O
connector	O
)	O
is	O
a	O
precision	O
coaxial	B-Protocol
connector	I-Protocol
used	O
on	O
laboratory	O
microwave	O
test	O
equipment	O
for	O
frequencies	O
up	O
to	O
18GHz	O
.	O
</s>
<s>
APC-7	B-Protocol
connectors	I-Protocol
are	O
advantageous	O
because	O
they	O
have	O
a	O
low-reflection	O
coefficient	O
,	O
make	O
repeatable	O
coaxial	O
connections	O
,	O
and	O
are	O
genderless	O
.	O
</s>
<s>
APC-7	B-Protocol
connector	I-Protocol
pairs	O
have	O
several	O
desirable	O
features	O
:	O
</s>
<s>
The	O
mated	O
pair	O
of	O
APC-7	B-Protocol
connectors	I-Protocol
has	O
a	O
low	O
reflection	O
coefficient	O
and	O
thus	O
low	O
voltage	O
standing	O
wave	O
ratio	O
(	O
VSWR	O
)	O
.	O
</s>
<s>
APC-7	B-Protocol
connectors	I-Protocol
require	O
adapters	O
to	O
change	O
from	O
the	O
connectors	O
used	O
in	O
the	O
laboratory	O
to	O
those	O
used	O
on	O
everyday	O
products	O
.	O
</s>
<s>
For	O
example	O
,	O
an	O
APC-7	B-Protocol
to	O
type	O
N	O
(	O
f	O
)	O
cost	O
$105	O
in	O
1979	O
.	O
</s>
