<s>
The	O
FM	B-Algorithm
broadcast	I-Algorithm
band	I-Algorithm
is	O
a	O
range	O
of	O
radio	O
frequencies	O
used	O
for	O
FM	B-Application
broadcasting	B-Operating_System
by	O
radio	O
stations	O
.	O
</s>
<s>
In	O
Europe	O
and	O
Africa	O
(	O
defined	O
as	O
International	O
Telecommunication	O
Union	O
(	O
ITU	O
)	O
region	O
1	O
)	O
and	O
in	O
Australia	O
and	O
New	O
Zealand	O
,	O
it	O
spans	O
from	O
87.5	O
to	O
108	O
megahertz	O
(	O
MHz	O
)	O
-	O
also	O
known	O
as	O
VHF	B-Algorithm
Band	I-Algorithm
II	O
-	O
while	O
in	O
the	O
Americas	O
(	O
ITU	O
region	O
2	O
)	O
it	O
ranges	O
from	O
88	O
to	O
108MHz	O
.	O
</s>
<s>
The	O
FM	B-Algorithm
broadcast	I-Algorithm
band	I-Algorithm
in	O
Japan	O
uses	O
76	O
to	O
95MHz	O
,	O
and	O
in	O
Brazil	O
,	O
76	O
to	O
108MHz	O
.	O
</s>
<s>
Frequency	B-Application
modulation	I-Application
radio	O
originated	O
in	O
the	O
United	O
States	O
during	O
the	O
1930s	O
;	O
the	O
system	O
was	O
developed	O
by	O
the	O
American	O
electrical	O
engineer	O
Edwin	O
Howard	O
Armstrong	O
.	O
</s>
<s>
However	O
,	O
FM	B-Application
broadcasting	B-Operating_System
did	O
not	O
become	O
widespread	O
,	O
even	O
in	O
North	O
America	O
,	O
until	O
the	O
1960s	O
.	O
</s>
<s>
Frequency-modulated	B-Application
radio	O
waves	O
can	O
be	O
generated	O
at	O
any	O
frequency	O
.	O
</s>
<s>
All	O
the	O
bands	O
mentioned	O
in	O
this	O
article	O
are	O
in	O
the	O
very	B-Algorithm
high	I-Algorithm
frequency	I-Algorithm
(	O
VHF	B-Algorithm
)	O
range	O
,	O
which	O
extends	O
from	O
30	O
to	O
300MHz	O
.	O
</s>
<s>
While	O
all	O
countries	O
use	O
FM	B-Application
channel	O
center	O
frequencies	O
ending	O
in	O
0.1	O
,	O
0.3	O
,	O
0.5	O
,	O
0.7	O
,	O
and	O
0.9MHz	O
,	O
some	O
countries	O
also	O
use	O
center	O
frequencies	O
ending	O
in	O
0.0	O
,	O
0.2	O
,	O
0.4	O
,	O
0.6	O
,	O
and	O
0.8MHz	O
.	O
</s>
<s>
An	O
ITU	O
conference	O
in	O
Geneva	O
,	O
Switzerland	B-Protocol
,	O
on	O
December	O
7	O
,	O
1984	O
,	O
resolved	O
to	O
discontinue	O
the	O
use	O
of	O
50kHz	O
channel	O
spacings	O
throughout	O
Europe	O
.	O
</s>
<s>
Most	O
countries	O
have	O
used	O
100kHz	O
or	O
200kHz	O
channel	O
spacings	O
for	O
FM	B-Application
broadcasting	B-Operating_System
since	O
this	O
ITU	O
conference	O
in	O
1984	O
.	O
</s>
<s>
Some	O
digitally-tuned	O
FM	B-Application
radios	O
are	O
unable	O
to	O
tune	O
using	O
50kHz	O
or	O
even	O
100kHz	O
increments	O
.	O
</s>
<s>
Therefore	O
,	O
when	O
traveling	O
abroad	O
or	O
importing	O
receivers	B-Device
,	O
stations	O
that	O
broadcast	B-Operating_System
on	O
certain	O
frequencies	O
using	O
such	O
increments	O
may	O
not	O
be	O
heard	O
clearly	O
.	O
</s>
<s>
A	O
few	O
countries	O
,	O
such	O
as	O
Italy	O
,	O
which	O
have	O
heavily	O
congested	O
FM	B-Algorithm
bands	I-Algorithm
,	O
still	O
allow	O
a	O
station	O
on	O
any	O
multiple	O
of	O
50kHz	O
wherever	O
one	O
can	O
be	O
squeezed	O
in	O
.	O
</s>
<s>
The	O
50kHz	O
channel	O
spacings	O
help	O
prevent	O
co-channel	O
interference	O
,	O
and	O
these	O
take	O
advantage	O
of	O
FM	B-Application
's	O
capture	O
effect	O
and	O
receiver	B-Device
selectivity	O
.	O
</s>
<s>
In	O
Canada	O
,	O
the	O
United	O
States	O
,	O
Mexico	O
,	O
the	O
Bahamas	O
,	O
etc.	O
,	O
there	O
are	O
101	O
FM	B-Algorithm
channels	I-Algorithm
numbered	O
from	O
200	O
(	O
center	O
frequency	O
87.9MHz	B-Algorithm
)	O
to	O
300	O
(	O
center	O
frequency	O
107.9MHz	O
)	O
,	O
though	O
these	O
numbers	O
are	O
rarely	O
used	O
outside	O
the	O
fields	O
of	O
radio	O
engineering	O
and	O
government	O
.	O
</s>
<s>
The	O
center	O
frequencies	O
of	O
the	O
FM	B-Algorithm
channels	I-Algorithm
are	O
spaced	O
in	O
increments	O
of	O
200kHz	O
.	O
</s>
<s>
The	O
frequency	O
of	O
87.9MHz	B-Algorithm
,	O
while	O
technically	O
part	O
of	O
TV	O
channel	O
6	O
(	O
82	O
to	O
88MHz	O
)	O
,	O
is	O
used	O
by	O
just	O
two	O
FM	B-Application
class-D	O
stations	O
in	O
the	O
United	O
States	O
.	O
</s>
<s>
Portable	O
radio	B-Device
tuners	I-Device
often	O
tune	O
down	O
to	O
87.5MHz	O
,	O
so	O
that	O
the	O
same	O
radios	O
can	O
be	O
made	O
and	O
sold	O
worldwide	O
.	O
</s>
<s>
Automobiles	O
usually	O
have	O
FM	B-Application
radios	O
that	O
can	O
tune	O
down	O
to	O
87.7MHz	O
,	O
so	O
that	O
TV	O
channel	O
6	O
's	O
audio	B-Operating_System
at	O
87.75MHz	O
( ±10kHz	O
)	O
could	O
be	O
received	O
,	O
such	O
as	O
in	O
Birmingham	O
,	O
Alabama	O
,	O
and	O
Denver	O
,	O
Colorado	O
.	O
</s>
<s>
With	O
the	O
advent	O
of	O
digital	B-Application
television	I-Application
in	O
the	O
United	O
States	O
,	O
this	O
ability	O
will	O
soon	O
be	O
irrelevant	O
when	O
the	O
remaining	O
analog	O
LPTV	O
stations	O
are	O
required	O
by	O
the	O
FCC	O
to	O
shut	O
down	O
or	O
convert	O
to	O
digital	O
by	O
September	O
2015	O
—	O
but	O
there	O
are	O
still	O
analog	O
television	O
stations	O
in	O
the	O
sparsely-populated	O
regions	O
of	O
northern	O
Canada	O
.	O
</s>
<s>
Originally	O
,	O
the	O
American	O
Federal	O
Communications	O
Commission	O
(	O
FCC	O
)	O
devised	O
a	O
bandplan	B-Algorithm
in	O
which	O
FM	B-Application
radio	O
stations	O
would	O
be	O
assigned	O
at	O
intervals	O
of	O
four	O
channels	O
(	O
800kHz	O
separation	O
)	O
for	O
any	O
one	O
geographic	O
area	O
.	O
</s>
<s>
Certain	O
frequencies	O
were	O
designated	O
for	O
Class	O
A	O
only	O
(	O
see	O
FM	B-Application
broadcasting	B-Operating_System
)	O
,	O
which	O
had	O
a	O
limit	O
of	O
three	O
kilowatts	O
of	O
effective	O
radiated	O
power	O
(	O
ERP	O
)	O
and	O
an	O
antenna	O
height	O
limit	O
for	O
the	O
center	O
of	O
radiation	O
of	O
300	O
feet	O
(	O
91.4	O
m	O
)	O
height	O
above	O
average	O
terrain	O
(	O
HAAT	O
)	O
.	O
</s>
<s>
In	O
the	O
late	O
1980s	O
,	O
the	O
FCC	O
switched	O
to	O
a	O
bandplan	B-Algorithm
based	O
on	O
a	O
distance	O
separation	O
table	O
using	O
currently	O
operating	O
stations	O
,	O
and	O
subdivided	O
the	O
class	O
table	O
to	O
create	O
extra	O
classes	O
and	O
change	O
antenna	O
height	O
limits	O
to	O
meters	O
.	O
</s>
<s>
In	O
2017	O
,	O
Brazil	O
laid	O
the	O
groundwork	O
to	O
reclaim	O
channels	O
5	O
and	O
6	O
(	O
76.1	O
–	O
87.5MHz	O
)	O
for	O
sound	O
broadcasting	B-Operating_System
use	O
and	O
required	O
new	O
radio	O
receivers	B-Device
to	O
be	O
able	O
to	O
tune	O
into	O
the	O
new	O
extended	O
band	O
(	O
,	O
abbreviated	O
eFM	O
)	O
.	O
</s>
<s>
Five	O
transmitters	O
of	O
public	O
broadcaster	O
Brazil	O
Communication	O
Company	O
were	O
the	O
first	O
extended-band	O
stations	O
to	O
begin	O
broadcasts	B-Operating_System
on	O
May	O
7	O
,	O
2021	O
.	O
</s>
<s>
Normally	O
each	O
channel	O
is	O
200kHz	O
(	O
0.2MHz	O
)	O
wide	O
,	O
and	O
can	O
pass	O
audio	B-Operating_System
and	O
subcarrier	O
frequencies	O
up	O
to	O
100kHz	O
.	O
</s>
<s>
Deviation	B-Device
is	O
typically	O
limited	O
to	O
150kHz	O
total	O
( ±75kHz	O
)	O
in	O
order	O
to	O
prevent	O
adjacent-channel	O
interference	O
on	O
the	O
band	O
.	O
</s>
<s>
Stations	O
in	O
the	O
U.S.	O
may	O
go	O
up	O
to	O
10%	O
over	O
this	O
limit	O
if	O
they	O
use	O
non-stereo	O
subcarriers	O
,	O
increasing	O
total	O
modulation	B-Application
by	O
0.5	O
%	O
for	O
each	O
1%	O
used	O
by	O
the	O
subcarriers	O
.	O
</s>
<s>
The	O
OIRT	O
FM	B-Algorithm
broadcast	I-Algorithm
band	I-Algorithm
covers	O
65.9	O
to	O
74MHz	O
.	O
</s>
<s>
It	O
was	O
used	O
in	O
the	O
Soviet	O
Union	O
and	O
most	O
of	O
the	O
other	O
Warsaw	O
Pact	O
member	O
countries	O
of	O
the	O
International	O
Radio	O
and	O
Television	O
Organisation	O
in	O
Eastern	O
Europe	O
(	O
OIRT	O
)	O
,	O
with	O
the	O
exception	O
of	O
East	O
Germany	O
,	O
which	O
always	O
used	O
the	O
87.5	O
to	O
100	O
(	O
later	O
104	O
)	O
MHz	O
broadcast	B-Operating_System
band	O
—	O
in	O
line	O
with	O
Western	O
Europe	O
.	O
</s>
<s>
The	O
lower	B-Algorithm
portion	I-Algorithm
of	I-Algorithm
the	I-Algorithm
VHF	I-Algorithm
band	I-Algorithm
behaves	O
a	O
bit	O
like	O
shortwave	O
radio	O
in	O
that	O
it	O
has	O
a	O
longer	O
reach	O
than	O
the	O
upper	O
portion	O
of	O
the	O
VHF	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
It	O
was	O
ideally	O
suited	O
for	O
reaching	O
vast	O
and	O
remote	O
areas	O
that	O
would	O
otherwise	O
lack	O
FM	B-Application
radio	O
reception	O
.	O
</s>
<s>
In	O
a	O
way	O
,	O
FM	B-Application
suited	O
this	O
band	O
because	O
the	O
capture	O
effect	O
of	O
FM	B-Application
could	O
mitigate	O
interference	O
from	O
skywaves	O
.	O
</s>
<s>
Many	O
countries	O
have	O
completely	O
ceased	O
broadcasting	B-Operating_System
on	O
the	O
OIRT	O
FM	B-Algorithm
band	I-Algorithm
,	O
although	O
use	O
continues	O
in	O
others	O
,	O
mainly	O
the	O
former	O
republics	O
of	O
the	O
USSR	O
.	O
</s>
<s>
The	O
future	O
of	O
broadcasting	B-Operating_System
on	O
the	O
OIRT	O
FM	B-Algorithm
band	I-Algorithm
is	O
limited	O
,	O
due	O
to	O
the	O
lack	O
of	O
new	O
consumer	O
receivers	B-Device
for	O
this	O
band	O
outside	O
of	O
Russia	O
.	O
</s>
<s>
The	O
frequency	B-Algorithm
plan	I-Algorithm
was	O
created	O
,	O
which	O
was	O
internationally	O
coordinated	O
at	O
Regional	O
Administrative	O
Conference	O
for	O
FM	B-Application
Sound	O
Broadcasting	B-Operating_System
in	O
the	O
VHF	B-Algorithm
band	I-Algorithm
in	O
Geneva	O
,	O
1984	O
.	O
</s>
<s>
Hungary	O
closed	O
down	O
its	O
remaining	O
broadcast	B-Operating_System
transmitters	O
in	O
2007	O
,	O
and	O
for	O
thirty	O
days	O
in	O
July	O
of	O
that	O
year	O
,	O
several	O
Hungarian	O
amateur	O
radio	O
operators	O
received	O
a	O
temporary	O
experimental	O
permit	O
to	O
perform	O
propagation	O
and	O
interference	O
experiments	O
in	O
the	O
70	O
–	O
70.5MHz	O
band	O
.	O
</s>
<s>
All	O
stations	O
on	O
OIRT	O
in	O
Belarus	O
are	O
a	O
mirror	O
of	O
normal	O
FM	B-Application
broadcasts	B-Operating_System
.	O
</s>
<s>
In	O
2014	O
,	O
Russia	O
began	O
replacing	O
OIRT-banded	O
transmitter	O
with	O
CCIR-banded	O
(	O
the	O
"	O
western	O
"	O
)	O
FM	B-Application
transmitters	O
.	O
</s>
<s>
The	O
main	O
reason	O
for	O
the	O
change	O
to	O
CCIR	O
FM	B-Application
is	O
to	O
reach	O
more	O
listeners	O
.	O
</s>
<s>
Unlike	O
Western	O
practice	O
,	O
OIRT	O
FM	B-Application
frequencies	O
are	O
based	O
on	O
30kHz	O
rather	O
than	O
50	O
,	O
100	O
or	O
200kHz	O
multiples	O
.	O
</s>
<s>
Stereo	O
is	O
generally	O
achieved	O
by	O
sending	O
the	O
stereo	O
difference	O
signal	O
,	O
using	O
a	O
process	O
called	O
polar	B-Protocol
modulation	I-Protocol
.	O
</s>
<s>
Polar	B-Protocol
modulation	I-Protocol
uses	O
a	O
reduced	O
subcarrier	O
on	O
31.25kHz	O
with	O
the	O
audio	B-Operating_System
on	O
both	O
side-bands	O
.	O
</s>
<s>
The	O
4-meter	B-Algorithm
band	I-Algorithm
(	O
70	O
–	O
70.5MHz	O
)	O
amateur	O
radio	O
allocation	O
used	O
in	O
many	O
European	O
countries	O
is	O
entirely	O
within	O
the	O
OIRT	O
FM	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
Operators	O
on	O
this	O
band	O
and	O
the	O
6-meter	B-Algorithm
band	I-Algorithm
(	O
50	O
–	O
54MHz	O
)	O
use	O
the	O
presence	O
of	O
broadcast	B-Operating_System
stations	O
as	O
an	O
indication	O
that	O
there	O
is	O
an	O
"	O
opening	O
"	O
into	O
Eastern	O
Europe	O
or	O
Russia	O
.	O
</s>
<s>
This	O
can	O
be	O
a	O
mixed	O
blessing	O
because	O
the	O
4meter	O
amateur	O
allocation	O
is	O
only	O
0.5MHz	O
or	O
less	O
,	O
and	O
a	O
single	O
broadcast	B-Operating_System
station	O
causes	O
considerable	O
interference	O
to	O
a	O
large	O
part	O
of	O
the	O
band	O
.	O
</s>
<s>
The	O
System	O
D	O
television	O
channels	O
R4	O
and	O
R5	O
lie	O
wholly	O
or	O
partly	O
within	O
the	O
87.5	O
–	O
108MHz	O
FM	B-Application
audio	B-Operating_System
broadcast	B-Operating_System
band	O
.	O
</s>
<s>
Countries	O
which	O
still	O
use	O
System	O
D	O
therefore	O
have	O
to	O
consider	O
the	O
re-organisation	O
of	O
TV	O
broadcasting	B-Operating_System
in	O
order	O
to	O
make	O
full	O
use	O
of	O
this	O
band	O
for	O
audio	B-Operating_System
broadcasting	B-Operating_System
.	O
</s>
<s>
The	O
FM	B-Algorithm
band	I-Algorithm
in	O
Japan	O
is	O
76	O
–	O
95MHz	O
(	O
previously	O
76	O
–	O
90	O
)	O
.	O
</s>
<s>
The	O
90	O
–	O
108MHz	O
section	O
was	O
used	O
for	O
analog	O
VHF	B-Algorithm
TV	O
Channels	O
1	O
,	O
2	O
and	O
3	O
(	O
each	O
NTSC	O
television	O
channel	O
is	O
6MHz	O
wide	O
)	O
.	O
</s>
<s>
The	O
narrowness	O
of	O
the	O
Japanese	O
band	O
(	O
19MHz	O
compared	O
to	O
slightly	O
more	O
than	O
20MHz	O
for	O
the	O
CCIR	O
band	O
)	O
limits	O
the	O
number	O
of	O
FM	B-Application
stations	O
that	O
can	O
be	O
accommodated	O
on	O
the	O
dial	O
with	O
the	O
result	O
that	O
many	O
commercial	O
radio	O
stations	O
are	O
forced	O
to	O
use	O
AM	O
.	O
</s>
<s>
Many	O
Japanese	O
radios	O
are	O
capable	O
of	O
receiving	O
both	O
the	O
Japanese	O
FM	B-Algorithm
band	I-Algorithm
and	O
the	O
CCIR	O
FM	B-Algorithm
band	I-Algorithm
,	O
so	O
that	O
the	O
same	O
model	O
can	O
be	O
sold	O
within	O
Japan	O
or	O
exported	O
.	O
</s>
<s>
If	O
these	O
radios	O
were	O
sold	O
in	O
the	O
US	O
,	O
for	O
example	O
,	O
the	O
76	O
–	O
88	O
section	O
would	O
be	O
marked	O
TV	O
sound	O
for	O
VHF	B-Algorithm
channels	O
5	O
and	O
6	O
(	O
as	O
two	O
6MHz-wide	O
NTSC	O
TV	O
channels	O
)	O
,	O
with	O
the	O
88	O
–	O
108	O
section	O
band	O
as	O
normal	O
FM	B-Application
.	O
</s>
<s>
The	O
compatibility	O
of	O
"	O
TV	O
sound	O
"	O
with	O
conventional	O
FM	B-Application
radio	O
ended	O
with	O
the	O
U.S.	O
digital	B-Application
TV	I-Application
transition	O
in	O
2009	O
,	O
with	O
the	O
exception	O
of	O
the	O
limited	O
number	O
of	O
low-power	O
stations	O
on	O
channel	O
6	O
that	O
still	O
use	O
analog	O
;	O
these	O
low-power	O
stations	O
will	O
switch	O
to	O
digital	O
in	O
2021	O
.	O
</s>
<s>
Second-hand	O
automobiles	O
imported	O
from	O
Japan	O
contain	O
a	O
radio	O
designed	O
for	O
the	O
Japanese	O
FM	B-Algorithm
band	I-Algorithm
,	O
and	O
importers	O
often	O
fit	O
a	O
"	O
converter	O
"	O
to	O
down-convert	O
the	O
87.5	O
to	O
107.9MHz	O
band	O
to	O
the	O
frequencies	O
that	O
the	O
radio	O
can	O
accept	O
.	O
</s>
<s>
In	O
addition	O
to	O
showing	O
an	O
incorrect	O
frequency	O
,	O
there	O
are	O
two	O
other	O
disadvantages	O
that	O
can	O
result	O
in	O
undesired	O
performance	O
;	O
the	O
converter	O
cannot	O
down-convert	O
in	O
full	O
the	O
regular	O
international	O
FM	B-Algorithm
band	I-Algorithm
(	O
up	O
to	O
20.5MHz	O
wide	O
)	O
to	O
the	O
only	O
14MHz-wide	O
Japanese	O
band	O
(	O
unless	O
the	O
converter	O
incorporates	O
two	O
user-switchable	O
down-convert	O
modes	O
)	O
,	O
and	O
the	O
car	O
's	O
antenna	O
may	O
perform	O
poorly	O
on	O
the	O
higher	O
FM	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
Some	O
converters	O
simply	O
down-convert	O
the	O
FM	B-Algorithm
band	I-Algorithm
by	O
12MHz	O
,	O
leading	O
to	O
logical	O
frequencies	O
(	O
e.g.	O
</s>
<s>
Also	O
the	O
converter	O
may	O
not	O
allow	O
pass-through	O
of	O
the	O
MW	B-Algorithm
band	I-Algorithm
,	O
which	O
is	O
used	O
for	O
AM	O
broadcasting	B-Operating_System
.	O
</s>
<s>
Australia	O
had	O
a	O
similar	O
situation	O
with	O
Australian	O
TV	O
channels	O
3	O
,	O
4	O
and	O
5	O
that	O
are	O
between	O
88	O
and	O
108MHz	O
,	O
and	O
was	O
intending	O
to	O
follow	O
Japan	O
,	O
but	O
in	O
the	O
end	O
opted	O
for	O
the	O
western	O
bandplan	B-Algorithm
,	O
due	O
to	O
CCIR	O
radios	O
that	O
entered	O
the	O
country	O
.	O
</s>
<s>
In	O
the	O
1930s	O
investigations	O
were	O
begun	O
into	O
establishing	O
radio	O
stations	O
transmitting	O
on	O
"	O
Very	B-Algorithm
High	I-Algorithm
Frequency	I-Algorithm
"	O
(	O
VHF	B-Algorithm
)	O
assignments	O
above	O
30MHz	O
.	O
</s>
<s>
Like	O
the	O
existing	O
AM	B-Algorithm
band	I-Algorithm
these	O
stations	O
employed	O
amplitude	O
modulation	B-Application
,	O
however	O
the	O
40kHz	O
spacing	O
between	O
adjacent	O
frequencies	O
was	O
four	O
times	O
as	O
much	O
as	O
the	O
10kHz	O
spacing	O
on	O
the	O
standard	O
AM	O
broadcast	B-Operating_System
band	O
,	O
which	O
reduced	O
adjacent-frequency	O
interference	O
,	O
and	O
provided	O
more	O
bandwidth	O
for	O
high-fidelity	O
programming	O
.	O
</s>
<s>
Also	O
during	O
the	O
1930s	O
Edwin	O
Howard	O
Armstrong	O
developed	O
a	O
competing	O
transmission	O
technology	O
,	O
"	O
wide-band	O
frequency	B-Application
modulation	I-Application
"	O
,	O
which	O
was	O
promoted	O
as	O
being	O
superior	O
to	O
AM	O
transmissions	O
,	O
in	O
particular	O
due	O
to	O
its	O
high-fidelity	O
and	O
near	O
immunity	O
to	O
static	O
interference	O
.	O
</s>
<s>
In	O
May	O
1940	O
,	O
largely	O
as	O
the	O
result	O
of	O
Armstrong	O
's	O
efforts	O
,	O
the	O
FCC	O
decided	O
to	O
eliminate	O
the	O
Apex	O
band	O
,	O
and	O
authorized	O
an	O
FM	B-Algorithm
band	I-Algorithm
effective	O
January	O
1	O
,	O
1941	O
,	O
operating	O
on	O
40	O
channels	O
spanning	O
42	O
–	O
50MHz	O
,	O
with	O
the	O
first	O
five	O
channels	O
reserved	O
for	O
educational	O
stations	O
.	O
</s>
<s>
There	O
was	O
significant	O
interest	O
in	O
the	O
new	O
FM	B-Algorithm
band	I-Algorithm
by	O
station	O
owners	O
,	O
however	O
,	O
construction	O
restrictions	O
that	O
went	O
into	O
place	O
during	O
World	O
War	O
II	O
limited	O
the	O
growth	O
of	O
the	O
new	O
service	O
.	O
</s>
<s>
A	O
particularly	O
controversial	O
proposal	O
,	O
spearheaded	O
by	O
the	O
Radio	O
Corporation	O
of	O
America	O
(	O
RCA	O
)	O
,	O
which	O
was	O
headed	O
by	O
David	O
Sarnoff	O
,	O
was	O
that	O
the	O
FM	B-Algorithm
band	I-Algorithm
needed	O
to	O
be	O
shifted	O
to	O
higher	O
frequencies	O
in	O
order	O
to	O
avoid	O
this	O
potential	O
problem	O
.	O
</s>
<s>
Armstrong	O
charged	O
that	O
this	O
reassignment	O
had	O
the	O
covert	O
goal	O
of	O
disrupting	O
FM	B-Application
radio	O
development	O
,	O
however	O
RCA	O
's	O
proposal	O
prevailed	O
,	O
and	O
on	O
June	O
27	O
,	O
1945	O
the	O
FCC	O
announced	O
the	O
reassignment	O
of	O
the	O
FM	B-Algorithm
band	I-Algorithm
to	O
90	O
channels	O
from	O
88	O
–	O
106MHz	O
,	O
which	O
was	O
soon	O
expanded	O
to	O
100	O
channels	O
from	O
88	O
–	O
108MHz	O
,	O
with	O
the	O
first	O
20	O
channels	O
reserved	O
for	O
educational	O
stations	O
.	O
</s>
<s>
A	O
period	O
of	O
allowing	O
existing	O
FM	B-Application
stations	O
to	O
broadcast	B-Operating_System
on	O
both	O
the	O
original	O
"	O
low	O
"	O
and	O
new	O
"	O
high	O
"	O
FM	B-Algorithm
bands	I-Algorithm
followed	O
,	O
which	O
ended	O
at	O
midnight	O
on	O
January	O
8	O
,	O
1949	O
,	O
at	O
which	O
time	O
all	O
low	O
band	O
transmissions	O
had	O
to	O
end	O
.	O
</s>
<s>
In	O
March	O
2008	O
,	O
the	O
FCC	O
requested	O
public	O
comment	O
on	O
turning	O
the	O
bandwidth	O
currently	O
occupied	O
by	O
analog	O
television	O
channels	O
5	O
and	O
6	O
(	O
76	O
–	O
88MHz	O
)	O
over	O
to	O
extending	O
the	O
FM	B-Algorithm
broadcast	I-Algorithm
band	I-Algorithm
when	O
the	O
digital	B-Application
television	I-Application
transition	O
was	O
to	O
be	O
completed	O
in	O
February	O
2009	O
(	O
ultimately	O
delayed	O
to	O
June	O
2009	O
)	O
.	O
</s>
<s>
This	O
proposed	O
allocation	O
would	O
have	O
effectively	O
assigned	O
frequencies	O
corresponding	O
to	O
the	O
existing	O
Japanese	O
FM	B-Application
radio	O
service	O
(	O
which	O
begins	O
at	O
76MHz	O
)	O
for	O
use	O
as	O
an	O
extension	O
to	O
the	O
existing	O
North	O
American	O
FM	B-Algorithm
broadcast	I-Algorithm
band	I-Algorithm
.	O
</s>
<s>
With	O
the	O
gradual	O
adoption	O
of	O
digital	O
radio	O
broadcasting	B-Operating_System
(	O
e.g.	O
</s>
<s>
HD	O
Radio	O
,	O
DAB+	O
)	O
radio	O
,	O
some	O
countries	O
have	O
planned	O
and	O
started	O
an	O
FM	B-Application
radio	O
switch-off	O
.	O
</s>
<s>
Norway	O
,	O
in	O
January	O
2018	O
,	O
was	O
the	O
first	O
country	O
to	O
discontinue	O
FM	B-Application
as	O
a	O
result	O
.	O
</s>
