<s>
Remote	B-Application
Radar	I-Application
Head	I-Application
Portreath	O
or	O
RRH	B-Algorithm
Portreath	I-Algorithm
is	O
an	O
air	O
defence	O
radar	B-Application
station	I-Application
operated	O
by	O
the	O
Royal	O
Air	O
Force	O
.	O
</s>
<s>
Its	O
radar	B-Application
(	O
housed	O
in	O
a	O
fibre	O
glass	O
or	O
golf	O
ball	O
protective	O
dome	O
)	O
provides	O
long-range	O
coverage	O
of	O
the	O
south	O
western	O
approaches	O
to	O
the	O
United	O
Kingdom	O
.	O
</s>
<s>
Previously	O
known	O
as	O
RAF	B-Algorithm
Portreath	I-Algorithm
,	O
the	O
station	O
was	O
built	O
during	O
1940	O
,	O
opened	O
in	O
March	O
1941	O
and	O
had	O
a	O
varied	O
career	O
during	O
the	O
Second	O
World	O
War	O
,	O
initially	O
as	O
a	O
RAF	O
Fighter	O
Command	O
station	O
,	O
from	O
October	O
1941	O
as	O
a	O
ferry	O
stop-over	O
for	O
aircraft	O
bound	O
to/from	O
North	O
Africa	O
and	O
the	O
Middle	O
East	O
,	O
as	O
a	O
temporary	O
stop-over	O
for	O
United	O
States	O
Army	O
Air	O
Forces	O
and	O
Royal	O
Canadian	O
Air	O
Force	O
units	O
,	O
and	O
then	O
as	O
a	O
RAF	O
Coastal	O
Command	O
station	O
.	O
</s>
<s>
Nancekuke	O
became	O
an	O
important	O
factory	O
for	O
stockpiling	O
the	O
UK	O
's	O
Chemical	O
Defences	O
during	O
the	O
Cold	B-Application
War	I-Application
.	O
</s>
<s>
The	O
RAF	O
re-opened	O
parts	O
of	O
the	O
site	O
as	O
a	O
manned	O
radar	B-Application
station	I-Application
in	O
October	O
1980	O
,	O
a	O
Control	O
and	O
Reporting	O
Post	O
(	O
CRP	O
)	O
for	O
UK	O
Air	O
Surveillance	O
.	O
</s>
<s>
New	O
mobile	O
radar	B-Application
systems	I-Application
manufactured	O
by	O
Marconi	O
Electronic	O
Systems	O
,	O
including	O
an	O
S723	O
Martello	O
(	O
RAF	O
Type	O
91	O
)	O
,	O
and	O
telecommunication	O
installations	O
were	O
added	O
during	O
the	O
mid-1980s	O
.	O
</s>
<s>
In	O
the	O
late	O
1990s	O
,	O
the	O
installation	O
became	O
remote	O
operation	O
,	O
and	O
the	O
primary	O
radar	B-Application
was	O
replaced	O
with	O
the	O
British	O
Aerospace	O
(	O
BAe	O
)	O
Type	O
101	O
.	O
</s>
<s>
The	O
radar	B-Application
now	O
in	O
use	O
at	O
Portreath	O
is	O
a	O
Type	O
102	O
Air	O
Defence	O
Radar	B-Application
.	O
</s>
<s>
As	O
part	O
of	O
a	O
major	O
upgrade	O
of	O
RRH	O
sites	O
around	O
the	O
U.K.	O
the	O
MOD	O
began	O
a	O
programme	O
titled	O
HYDRA	O
in	O
2020	O
to	O
install	O
new	O
state	O
of	O
the	O
art	O
communications	O
buildings	O
,	O
radar	B-Application
towers	O
and	O
bespoke	O
perimeter	O
security	O
.	O
</s>
