<s>
The	O
C	B-Algorithm
band	I-Algorithm
is	O
a	O
designation	O
by	O
the	O
Institute	O
of	O
Electrical	O
and	O
Electronics	O
Engineers	O
(	O
IEEE	O
)	O
for	O
a	O
portion	O
of	O
the	O
electromagnetic	O
spectrum	O
in	O
the	O
microwave	O
range	O
of	O
frequencies	O
ranging	O
from	O
4.0to	O
8.0gigahertz	O
(	O
GHz	O
)	O
.	O
</s>
<s>
However	O
,	O
the	O
U.S.	O
Federal	O
Communications	O
Commission	O
C	B-Algorithm
band	I-Algorithm
proceeding	O
and	O
auction	B-Algorithm
,	O
designated	O
3.7	O
–	O
4.2GHz	O
as	O
C	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
The	O
C	B-Algorithm
band	I-Algorithm
is	O
used	O
for	O
many	O
satellite	O
communications	O
transmissions	O
,	O
some	O
Wi-Fi	O
devices	O
,	O
some	O
cordless	O
telephones	O
,	O
as	O
well	O
as	O
some	O
radar	O
and	O
weather	B-Application
radar	I-Application
systems	I-Application
.	O
</s>
<s>
The	O
communications	O
C	B-Algorithm
band	I-Algorithm
was	O
the	O
first	O
frequency	O
band	O
that	O
was	O
allocated	O
for	O
commercial	O
telecommunications	O
via	O
satellites	O
.	O
</s>
<s>
The	O
same	O
frequencies	O
were	O
already	O
in	O
use	O
for	O
terrestrial	O
microwave	B-Application
radio	I-Application
relay	O
chains	O
.	O
</s>
<s>
Nearly	O
all	O
C-band	B-Algorithm
communication	O
satellites	O
use	O
the	O
band	O
of	O
frequencies	O
from	O
3.7	O
to	O
4.2GHz	O
for	O
their	O
downlinks	O
,	O
and	O
the	O
band	O
of	O
frequencies	O
from	O
5.925to	O
6.425GHz	O
for	O
their	O
uplinks	O
.	O
</s>
<s>
Note	O
that	O
by	O
using	O
the	O
band	O
from	O
3.7	O
to	O
4.0GHz	O
,	O
this	O
C	B-Algorithm
band	I-Algorithm
overlaps	O
somewhat	O
with	O
the	O
IEEE	O
S	B-Algorithm
band	I-Algorithm
for	O
radars	O
.	O
</s>
<s>
The	O
C-band	B-Algorithm
communication	O
satellites	O
typically	O
have	O
24	O
radio	O
transponders	O
spaced	O
20MHz	O
apart	O
,	O
but	O
with	O
the	O
adjacent	O
transponders	O
on	O
opposite	O
polarizations	O
such	O
that	O
transponders	O
on	O
the	O
same	O
polarization	O
are	O
always	O
40MHz	O
apart	O
.	O
</s>
<s>
One	O
use	O
of	O
the	O
C	B-Algorithm
band	I-Algorithm
is	O
for	O
satellite	O
communication	O
,	O
whether	O
for	O
full-time	O
satellite	O
television	O
networks	O
or	O
raw	O
satellite	O
feeds	O
,	O
although	O
subscription	O
programming	O
also	O
exists	O
.	O
</s>
<s>
The	O
satellite	O
communications	O
portion	O
of	O
the	O
C	B-Algorithm
band	I-Algorithm
is	O
highly	O
associated	O
with	O
television	O
receive-only	O
satellite	O
reception	O
systems	O
,	O
commonly	O
called	O
"	O
big	O
dish	O
"	O
systems	O
,	O
since	O
small	O
receiving	O
antennas	O
are	O
not	O
optimal	O
for	O
Cband	O
.	O
</s>
<s>
Typical	O
antenna	O
sizes	O
on	O
C-band-capable	O
systems	O
range	O
from	O
6	O
to	O
12feet	O
(	O
1.8	O
to	O
3.5meters	O
)	O
on	O
consumer	O
satellite	O
dishes	O
,	O
although	O
larger	O
ones	O
also	O
can	O
be	O
used	O
.	O
</s>
<s>
The	O
C	B-Algorithm
band	I-Algorithm
also	O
includes	O
the	O
5.8GHz	O
ISM	B-Algorithm
band	I-Algorithm
between	O
5.725	O
and	O
5.875GHz	O
,	O
which	O
is	O
used	O
for	O
medical	O
and	O
industrial	O
heating	O
applications	O
and	O
many	O
unlicensed	O
short-range	O
microwave	B-Application
communication	I-Application
systems	O
,	O
such	O
as	O
cordless	O
phones	O
,	O
baby	O
monitors	O
,	O
and	O
keyless	O
entry	O
systems	O
for	O
vehicles	O
.	O
</s>
<s>
The	O
C-band	B-Algorithm
frequencies	O
of	O
5.4GHz	O
band	O
[	O
5.15	O
to	O
5.35GHz	O
,	O
5.47	O
to	O
5.725GHz	O
,	O
or	O
5.725	O
to	O
5.875GHz	O
,	O
depending	O
on	O
the	O
region	O
of	O
the	O
world ]	O
are	O
used	O
for	O
IEEE	O
802.11a	O
Wi-Fi	O
wireless	O
computer	O
networks	O
.	O
</s>
<s>
The	O
C-Band	B-Algorithm
Alliance	O
was	O
an	O
industry	O
consortium	O
of	O
four	O
large	O
communications	O
satellite	O
operators	O
in	O
2018	O
–	O
2020	O
.	O
</s>
<s>
services	O
,	O
the	O
C-Band	B-Algorithm
Alliance	O
(	O
CBA	O
)	O
was	O
established	O
in	O
September	O
2018	O
by	O
the	O
four	O
satellite	O
operators	O
—	O
Intelsat	O
,	O
SES	O
,	O
Eutelsat	O
and	O
Telesat	O
—	O
that	O
provide	O
the	O
majority	O
of	O
C-band	B-Algorithm
satellite	I-Algorithm
services	O
in	O
the	O
US	O
,	O
including	O
media	O
distribution	O
reaching	O
100	O
million	O
US	O
households	O
.	O
</s>
<s>
The	O
consortium	O
made	O
a	O
proposal	O
to	O
the	O
FCC	O
to	O
act	O
as	O
a	O
facilitator	O
for	O
the	O
clearing	O
and	O
repurposing	O
of	O
a	O
200MHz	O
portion	O
of	O
C-band	B-Algorithm
spectrum	O
to	O
accelerate	O
the	O
deployment	O
of	O
next	O
generation	O
5G	O
services	O
,	O
while	O
protecting	O
incumbent	O
users	O
and	O
their	O
content	O
distribution	O
and	O
data	O
networks	O
in	O
the	O
US	O
from	O
potential	O
interference	O
.	O
</s>
<s>
The	O
C-Band	B-Algorithm
Alliance	O
lobbied	O
for	O
a	O
private	O
sale	O
,	O
but	O
the	O
FCC	O
and	O
some	O
members	O
of	O
Congress	O
wanted	O
an	O
auction	B-Algorithm
.	O
</s>
<s>
In	O
November	O
2019	O
,	O
the	O
FCC	O
announced	O
that	O
an	O
auction	B-Algorithm
was	O
planned	O
,	O
which	O
took	O
place	O
in	O
December	O
2020	O
.	O
</s>
<s>
By	O
February	O
2020	O
,	O
it	O
became	O
even	O
less	O
of	O
a	O
factor	O
in	O
C-band	B-Algorithm
spectrum	O
reallocation	O
as	O
Intelsat	O
pulled	O
out	O
of	O
the	O
alliance	O
and	O
communicated	O
to	O
the	O
FCC	O
that	O
the	O
C-Band	B-Algorithm
Alliance	O
was	O
dead	O
.	O
</s>
<s>
One	O
of	O
the	O
major	O
members	O
of	O
the	O
C-Band	B-Algorithm
Alliance	O
,	O
Intelsat	O
,	O
filed	O
for	O
bankruptcy	O
on	O
14	O
May	O
2020	O
,	O
just	O
before	O
the	O
new	O
5G	O
spectrum	B-Algorithm
auctions	I-Algorithm
were	O
to	O
take	O
place	O
,	O
with	O
over	O
in	O
total	O
debt	O
.	O
</s>
<s>
Slight	O
variations	O
in	O
the	O
assignments	O
of	O
C-band	B-Algorithm
frequencies	O
have	O
been	O
approved	O
for	O
use	O
in	O
various	O
parts	O
of	O
the	O
world	O
,	O
depending	O
on	O
their	O
locations	O
in	O
the	O
three	O
ITU	O
radio	O
regions	O
.	O
</s>
<s>
This	O
is	O
known	O
as	O
the	O
5-centimeter	B-Algorithm
band	I-Algorithm
by	O
amateurs	O
and	O
the	O
C	B-Algorithm
band	I-Algorithm
by	O
AMSAT	O
.	O
</s>
<s>
Particle	O
accelerators	O
may	O
be	O
powered	O
by	O
C-band	B-Algorithm
RF	O
sources	O
.	O
</s>
<s>
The	O
frequencies	O
are	O
then	O
standardized	O
at	O
5.996GHz	O
(	O
Europe	O
)	O
or	O
5.712GHz	O
(	O
US	O
)	O
,	O
which	O
is	O
the	O
second	O
harmonic	O
of	O
S	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
Several	O
tokamak	B-Application
fusion	O
reactors	O
use	O
high-power	O
C-band	B-Algorithm
RF	O
sources	O
to	O
sustain	O
the	O
toroidal	O
plasma	O
current	O
.	O
</s>
<s>
Common	O
frequencies	O
include	O
3.7GHz	O
(	O
Joint	O
European	O
Torus	O
,	O
WEST	O
(	O
formerly	O
Tore	O
Supra	O
)	O
)	O
,	O
4.6GHz	O
(	O
Alcator	O
C	O
,	O
Alcator	O
C-Mod	O
,	O
EAST	O
,	O
DIII-D	O
)	O
,	O
5GHz	O
(	O
KSTAR	O
,	O
ITER	O
)	O
and	O
8GHz	O
(	O
Frascati	O
Tokamak	B-Application
Upgrade	O
)	O
.	O
</s>
<s>
Verizon	O
,	O
AT&T	O
,	O
and	O
T-Mobile	O
spent	O
approximately	O
$45billion	O
,	O
$23billion	O
,	O
and	O
$9billion	O
respectively	O
during	O
the	O
auction	B-Algorithm
.	O
</s>
<s>
On	O
January	O
18	O
,	O
2022	O
,	O
Verizon	O
and	O
AT&T	O
announced	O
that	O
they	O
would	O
delay	O
their	O
C-band	B-Algorithm
5G	O
rollout	O
near	O
airports	O
in	O
response	O
to	O
those	O
concerns	O
.	O
</s>
