<s>
ARQ-E	B-Device
is	O
a	O
radio	O
transmission	O
method	O
used	O
to	O
send	O
data	O
over	O
short	O
wave	O
radio	O
.	O
</s>
<s>
ARQ-E	B-Device
is	O
a	O
full	O
duplex	O
synchronous	O
data	O
communications	O
system	O
that	O
requests	O
repeats	O
if	O
data	O
is	O
not	O
received	O
correctly	O
.	O
</s>
<s>
The	O
alphabet	O
used	O
in	O
the	O
ARQ-E	B-Device
protocol	O
is	O
an	O
extension	O
of	O
the	O
CCITT	O
Telegraph	O
Alphabet	O
No	O
.	O
</s>
<s>
The	O
ARQ-M	B-Device
alphabet	O
being	O
synchronous	O
always	O
has	O
to	O
send	O
data	O
and	O
does	O
not	O
have	O
gaps	O
between	O
characters	O
.	O
</s>
<s>
The	O
ARQ-E	B-Device
characters	O
are	O
extended	O
with	O
an	O
identification	O
bit	O
or	O
signal	O
element	O
at	O
the	O
start	O
to	O
indicate	O
whether	O
it	O
is	O
a	O
normal	O
character	O
or	O
a	O
function	O
signal	O
.	O
</s>
<s>
Different	O
variants	O
of	O
ARQ-E	B-Device
include	O
ARQ-E3	O
which	O
uses	O
a	O
different	O
alphabet	O
,	O
ITA3	O
as	O
in	O
ARQ-M	B-Device
.	O
ARQ-E3	O
can	O
also	O
be	O
called	O
CCIR	O
519	O
.	O
</s>
<s>
ITU	O
standard	O
F.519	O
introduces	O
this	O
as	O
a	O
variant	O
of	O
ARQ-M	B-Device
,	O
but	O
with	O
one	O
channel	O
.	O
</s>
<s>
ARQ-N	O
is	O
similar	O
to	O
ARQ-E	B-Device
but	O
there	O
is	O
no	O
marking	O
pattern	O
.	O
</s>
<s>
Software	O
is	O
available	O
for	O
professionals	O
and	O
hobbyists	O
to	O
receive	O
and	O
decode	O
utility	O
transmissions	O
that	O
use	O
ARQ-E	B-Device
.	O
Software	O
includes	O
go2MONIOR	O
which	O
can	O
handle	O
the	O
variants	O
and	O
multipsk	O
,	O
the	O
Rohde	O
&	O
Schwarz	O
GX401DC	O
,	O
the	O
Hoka	O
Code2-32P	O
,	O
and	O
Code200-32	O
,	O
Wavecom	O
,	O
the	O
WiNRADiO	O
Universal	O
FSK	O
Decoder	O
,	O
.	O
</s>
