<s>
The	O
10-meter	B-Algorithm
band	I-Algorithm
is	O
a	O
portion	O
of	O
the	O
shortwave	O
radio	O
spectrum	O
internationally	O
allocated	O
to	O
amateur	O
radio	O
and	O
amateur	O
satellite	O
use	O
on	O
a	O
primary	O
basis	O
.	O
</s>
<s>
The	O
10-meter	B-Algorithm
band	I-Algorithm
was	O
allocated	O
on	O
a	O
worldwide	O
basis	O
by	O
the	O
International	O
Radiotelegraph	O
Conference	O
in	O
Washington	O
,	O
D.C.	O
,	O
on	O
October	O
4	O
,	O
1927	O
.	O
</s>
<s>
In	O
the	O
late	O
1970s	O
,	O
the	O
impending	O
ban	O
by	O
the	O
FCC	O
of	O
the	O
sale	O
of	O
older	O
23-channel	O
CB	B-Application
equipment	O
that	O
did	O
not	O
meet	O
more	O
stringent	O
restrictions	O
on	O
newer	O
,	O
40-channel	O
units	O
,	O
meant	O
that	O
a	O
surplus	O
of	O
23-channel	O
CB	B-Application
gear	O
was	O
on	O
the	O
market	O
.	O
</s>
<s>
This	O
was	O
a	O
windfall	O
for	O
amateur	O
radio	O
enthusiasts	O
,	O
allowing	O
access	O
to	O
fairly	O
inexpensive	O
radios	O
which	O
could	O
easily	O
be	O
modified	O
for	O
use	O
in	O
the	O
10-meter	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
American	O
Novice	O
-	O
and	O
Technician-class	O
licensees	O
were	O
granted	O
CW	O
and	O
SSB	B-Device
segments	O
on	O
the	O
10-meter	B-Algorithm
band	I-Algorithm
as	O
of	O
00:01	O
UTC	O
March	O
21	O
,	O
1987	O
.	O
</s>
<s>
With	O
the	O
elimination	O
of	O
Morse	O
code	O
testing	O
requirements	O
for	O
U.S.	O
amateurs	O
in	O
February	O
2007	O
,	O
Technician-class	O
licensees	O
who	O
have	O
not	O
passed	O
a	O
code	O
test	O
may	O
operate	O
with	O
up	O
to	O
200	O
watts	O
PEP	O
using	O
CW	O
and	O
SSB	B-Device
modes	O
in	O
a	O
portion	O
of	O
the	O
10-meter	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
Being	O
a	O
very	O
wide	O
band	O
in	O
HF	O
terms	O
,	O
many	O
different	O
transmission	O
modes	O
can	O
be	O
found	O
on	O
10	B-Algorithm
meters	I-Algorithm
.	O
</s>
<s>
Morse	O
code	O
and	O
other	O
narrowband	O
modes	O
are	O
found	O
toward	O
the	O
bottom	O
portion	O
of	O
the	O
band	O
,	O
SSB	B-Device
from	O
28.300MHz	O
up	O
,	O
and	O
wideband	O
modes	O
(	O
AM	B-Device
and	O
FM	B-Application
)	O
are	O
found	O
near	O
the	O
upper	O
part	O
of	O
the	O
bottom	O
portion	O
of	O
the	O
band	O
.	O
</s>
<s>
Digital	O
modes	O
,	O
such	O
as	O
PSK-31	B-Device
,	O
are	O
also	O
allowed	O
in	O
the	O
upper	O
portion	O
of	O
the	O
band	O
,	O
with	O
28.120	O
being	O
a	O
popular	O
PSK-31	B-Device
frequency	O
.	O
</s>
<s>
Due	O
to	O
its	O
unique	O
spot	O
in	O
the	O
spectrum	O
,	O
10	B-Algorithm
meters	I-Algorithm
can	O
occasionally	O
be	O
challenging	O
to	O
work	O
.	O
</s>
<s>
At	O
peak	O
times	O
of	O
the	O
solar	O
cycle	O
when	O
many	O
sunspots	B-Application
appear	O
on	O
the	O
Sun	O
's	O
surface	O
,	O
10	B-Algorithm
meters	I-Algorithm
can	O
be	O
alive	O
with	O
extremely	O
long-distance	O
signals	O
,	O
refracting	O
from	O
the	O
F2	O
layer	O
in	O
the	O
ionosphere	O
.	O
</s>
<s>
During	O
periods	O
of	O
increased	O
sunspot	B-Application
activity	O
,	O
band	O
openings	O
may	O
begin	O
well	O
before	O
sunrise	O
and	O
continue	O
into	O
the	O
night	O
.	O
</s>
<s>
Even	O
in	O
times	O
of	O
solar	O
minimum	O
,	O
when	O
F2	O
is	O
rarely	O
available	O
,	O
10	B-Algorithm
meters	I-Algorithm
still	O
has	O
some	O
long	O
distance	O
possibilities	O
.	O
</s>
<s>
Sporadic	O
E	O
on	O
10	B-Algorithm
meters	I-Algorithm
is	O
mainly	O
a	O
seasonal	O
event	O
,	O
with	O
late	O
spring	O
and	O
early	O
summer	O
being	O
prime	O
time	O
for	O
the	O
mode	O
.	O
</s>
<s>
In	O
tropical	O
latitudes	O
10	B-Algorithm
meters	I-Algorithm
is	O
open	O
throughout	O
the	O
sunspot	B-Application
cycle	O
,	O
although	O
propagation	O
is	O
often	O
confined	O
to	O
other	O
areas	O
lying	O
along	O
the	O
equator	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
good	O
path	O
from	O
West	O
Africa	O
to	O
the	O
Caribbean	O
exists	O
on	O
10	B-Algorithm
meters	I-Algorithm
even	O
at	O
solar	O
minimum	O
.	O
</s>
<s>
Although	O
10	B-Algorithm
meters	I-Algorithm
has	O
a	O
worldwide	O
amateur	O
radio	O
allocation	O
,	O
in	O
some	O
countries	O
the	O
use	O
of	O
portions	O
of	O
10	B-Algorithm
meters	I-Algorithm
is	O
allocated	O
by	O
the	O
government	O
by	O
license	O
class	O
,	O
by	O
signal	O
mode	O
or	O
signal	O
bandwidth	O
.	O
</s>
<s>
Named	O
for	O
the	O
segment	O
of	O
10	B-Algorithm
meters	I-Algorithm
granted	O
for	O
use	O
to	O
American	O
Novice	O
Class	O
Amateur	O
Radio	O
license	O
holders	O
.	O
</s>
<s>
The	O
Novice	O
sub-bands	O
consist	O
of	O
two	O
frequency	O
ranges	O
;	O
one	O
for	O
CW	O
and	O
Data	O
operation	O
,	O
and	O
the	O
other	O
for	O
SSB	B-Device
phone	O
operation	O
.	O
</s>
<s>
28.000-28.300MHz	O
is	O
a	O
very	O
active	O
part	O
of	O
10	B-Algorithm
meters	I-Algorithm
for	O
CW	O
operation	O
.	O
</s>
<s>
28.300-28.500MHz	O
is	O
probably	O
the	O
most	O
active	O
part	O
of	O
the	O
10-meter	B-Algorithm
band	I-Algorithm
.	O
</s>
<s>
Operation	O
in	O
this	O
segment	O
is	O
almost	O
exclusively	O
SSB	B-Device
worldwide	O
.	O
</s>
<s>
Because	O
the	O
propagation	O
on	O
10	B-Algorithm
meters	I-Algorithm
can	O
vary	O
drastically	O
throughout	O
the	O
day	O
,	O
propagation	O
beacons	O
are	O
very	O
important	O
to	O
gauge	O
the	O
current	O
conditions	O
of	O
the	O
band	O
.	O
</s>
<s>
This	O
has	O
not	O
been	O
the	O
case	O
since	O
the	O
1970s	O
,	O
which	O
saw	O
an	O
influx	O
of	O
surplus	O
23-channel	O
CB	B-Application
equipment	O
modified	O
for	O
use	O
on	O
the	O
10-meter	O
amateur	O
band	O
.	O
</s>
<s>
Users	O
of	O
the	O
surplus	O
equipment	O
also	O
inherited	O
those	O
radios	O
 '	O
odd	O
channel	O
spacing	O
,	O
which	O
on	O
CB	B-Application
skipped	O
channels	O
that	O
were	O
not	O
used	O
there	O
,	O
because	O
they	O
were	O
set	O
aside	O
for	O
remote	O
control	O
operations	O
.	O
</s>
<s>
From	O
29.300	O
to	O
29.510MHz	O
the	O
satellite	O
sub	O
band	O
allows	O
amateur	O
radio	O
operators	O
to	O
communicate	O
with	O
orbiting	O
OSCARs	B-Application
.	O
</s>
<s>
From	O
29.000MHz	O
to	O
29.700	O
,	O
The	O
FM	B-Application
sub-band	O
is	O
usually	O
channelized	O
into	O
repeater	O
and	O
simplex	O
frequencies	O
.	O
</s>
<s>
Japan	O
and	O
others	O
use	O
29.00	O
to	O
29.40	O
FM	B-Application
simplex	O
.	O
</s>
<s>
Since	O
10	B-Algorithm
meters	I-Algorithm
can	O
frequently	O
open	O
up	O
to	O
propagate	O
globally	O
,	O
most	O
10-meter	O
repeaters	O
use	O
a	O
CTCSS	O
sub-audible	O
access	O
tone	O
.	O
</s>
<s>
British	O
hams	O
commonly	O
use	O
the	O
29.400	O
to	O
29.500MHz	O
band	O
for	O
FM	B-Application
as	O
well	O
with	O
29.400	O
,	O
29.450	O
,	O
and	O
29.500MHz	O
being	O
common	O
.	O
</s>
<s>
USA	O
hams	O
can	O
be	O
found	O
on	O
FM	B-Application
anywhere	O
above	O
29.000MHz	O
,	O
commonly	O
on	O
the	O
above	O
frequencies	O
talking	O
to	O
overseas	O
hams	O
.	O
</s>
<s>
29.200	O
to	O
29.300MHz	O
is	O
set	O
aside	O
in	O
some	O
area	O
band	O
plans	O
for	O
FM	B-Application
simplex	O
use	O
.	O
</s>
<s>
Due	O
to	O
its	O
unique	O
nature	O
,	O
10	B-Algorithm
meters	I-Algorithm
has	O
a	O
large	O
following	O
of	O
hobbyists	O
who	O
spend	O
most	O
of	O
their	O
time	O
on	O
this	O
frequency	O
band	O
.	O
</s>
<s>
Analog	B-Application
frequency	I-Application
modulation	I-Application
(	O
FM	B-Application
)	O
radio	O
relay	O
stations	O
(	O
repeaters	O
)	O
are	O
used	O
by	O
radio	O
operators	O
to	O
contact	O
each	O
other	O
around	O
the	O
world	O
,	O
while	O
relaying	O
through	O
an	O
intermediate	O
relay	O
site	O
.	O
</s>
