<s>
The	O
AN/SPS	B-Algorithm
-43	I-Algorithm
was	O
a	O
long-range	O
air-search	O
United	O
States	O
Navy	O
radar	B-Application
system	I-Application
introduced	O
in	O
March	O
1961	O
that	O
had	O
a	O
range	O
of	O
500+	O
km	O
.	O
</s>
<s>
This	O
radar	B-Application
could	O
provide	O
bearing	O
and	O
distance	O
information	O
,	O
but	O
no	O
altitude	O
information	O
.	O
</s>
<s>
The	O
-43	O
operated	O
at	O
VHF	B-Algorithm
frequency	O
-	O
somewhat	O
unusual	O
for	O
any	O
radar	B-Application
-	O
mostly	O
in	O
the	O
bandwidth	O
of	O
television	O
channel	O
13	O
.	O
</s>
<s>
The	O
main	O
difference	O
to	O
the	O
SPS-37	O
was	O
the	O
greatly	O
improved	O
ECCM	O
performance	O
,	O
as	O
the	O
AN/SPS	B-Algorithm
-43	I-Algorithm
could	O
jump	O
between	O
20	O
different	O
frequencies	O
to	O
frustrate	O
jamming	O
attempts	O
.	O
</s>
<s>
Typically	O
,	O
the	O
-43	O
would	O
detect	O
the	O
range	O
and	O
bearing	O
of	O
a	O
target	O
at	O
long	O
range	O
,	O
the	O
target	O
would	O
then	O
be	O
picked	O
up	O
by	O
a	O
3-D	O
radar	B-Application
such	O
as	O
the	O
AN/SPS	O
-30	O
(	O
or	O
later	O
the	O
AN/SPS	O
-48	O
)	O
,	O
which	O
,	O
assuming	O
the	O
target	O
to	O
be	O
hostile	O
would	O
present	O
the	O
target	O
information	O
to	O
a	O
fire-control	O
radar	B-Application
like	O
the	O
AN/SPG	B-Algorithm
-55	I-Algorithm
.	O
</s>
<s>
The	O
-55	O
was	O
a	O
very	O
directional	O
radar	B-Application
that	O
would	O
lock	O
on	O
to	O
a	O
target	O
,	O
which	O
then	O
would	O
cause	O
a	O
missile	O
to	O
launch	O
and	O
"	O
ride	O
the	O
beam	O
"	O
to	O
the	O
target	O
.	O
</s>
<s>
49	O
SPS-43	O
radars	B-Application
were	O
produced	O
and	O
mostly	O
installed	O
on	O
aircraft	O
carriers	O
and	O
World	O
War	O
II-cruisers	O
converted	O
to	O
guided	O
missile	O
cruisers	O
.	O
</s>
<s>
Also	O
a	O
few	O
amphibious	O
command	O
ships	O
received	O
the	O
radar	B-Application
.	O
</s>
<s>
U.S.	O
Navy	O
shipboard	O
radar	B-Application
systems	I-Application
were	O
maintained	O
by	O
the	O
Navy	O
Electronics	O
Technician	O
(	O
Radar	B-Application
)	O
,	O
or	O
ETR	O
.	O
</s>
<s>
The	O
-43	O
radar	B-Application
system	I-Application
has	O
been	O
replaced	O
by	O
newer	O
systems	O
,	O
such	O
as	O
the	O
AN/SPS	O
-49	O
.	O
</s>
