<s>
CLOVER	O
is	O
the	O
name	O
of	O
a	O
series	O
or	O
class	O
of	O
modem	O
modulation	O
techniques	O
(	O
“	O
waveforms	O
”	O
)	O
specifically	O
designed	O
for	O
use	O
over	O
high	B-Algorithm
frequency	I-Algorithm
(	O
HF	O
)	O
radio	O
systems	O
.	O
</s>
<s>
In	O
ARQ	B-Error_Name
mode	O
,	O
all	O
CCB	O
's	O
(	O
CLOVER	O
Control	O
Blocks	O
)	O
use	O
BPSK	O
modulation	O
and	O
data	O
blocks	O
may	O
be	O
sent	O
using	O
BPSK	O
,	O
QPSK	O
,	O
8PSK	O
(	O
see	O
phase-shift	B-General_Concept
keying	I-General_Concept
)	O
,	O
8P2A	O
,	O
or	O
16P4A	O
(	O
see	O
QAM	B-Device
)	O
modulation	O
.	O
</s>
<s>
The	O
FEC	B-Error_Name
broadcast	O
mode	O
of	O
CLOVER-2000	O
is	O
usually	O
disabled	O
although	O
special	O
formats	O
are	O
available	O
for	O
specific	O
applications	O
.	O
</s>
<s>
CLOVER	O
is	O
specifically	O
designed	O
for	O
use	O
over	O
HF	B-Algorithm
radio	I-Algorithm
communications	O
links	O
.	O
</s>
<s>
It	O
may	O
be	O
used	O
with	O
virtually	O
any	O
modern	O
HF	O
SSB	B-Device
radio	I-Device
.	O
</s>
