<s>
MT63	B-Device
is	O
a	O
digital	O
radio	O
modulation	O
mode	O
for	O
transmission	O
in	O
high-noise	O
situations	O
developed	O
by	O
Pawel	O
Jalocha	O
SP9VRC	O
.	O
</s>
<s>
MT63	B-Device
is	O
designed	O
for	O
keyboard-to-keyboard	O
conversation	O
modes	O
,	O
on	O
HF	B-Algorithm
amateur	O
radio	O
bands	O
.	O
</s>
<s>
MT63	B-Device
distributes	O
the	O
encoding	O
of	O
each	O
character	O
over	O
a	O
long	O
time	O
period	O
,	O
and	O
over	O
several	O
tones	O
.	O
</s>
<s>
The	O
MT63	B-Device
mode	O
is	O
very	O
tolerant	O
of	O
mistuning	O
,	O
as	O
most	O
software	O
will	O
handle	O
120	O
Hz	O
tuning	O
offsets	O
under	O
normal	O
conditions	O
.	O
</s>
<s>
One	O
shortcoming	O
of	O
MT63	B-Device
is	O
that	O
robustness	O
is	O
somewhat	O
compromised	O
with	O
the	O
short	O
interleaver	O
.	O
</s>
<s>
MT63	B-Device
is	O
seeing	O
a	O
resurgence	O
in	O
its	O
popularity	O
on	O
shortwave	O
with	O
the	O
VOA	O
Radiogram	O
but	O
the	O
software	O
used	O
to	O
encode	O
the	O
text	O
is	O
not	O
using	O
the	O
Varicode	B-General_Concept
that	O
MT63	B-Device
used	O
in	O
its	O
original	O
design	O
.	O
</s>
<s>
Modern	O
software	O
that	O
codes	O
MT63	B-Device
,	O
such	O
as	O
Fldigi	B-Protocol
,	O
has	O
opted	O
for	O
base128	O
that	O
is	O
essentially	O
ASCII-7	O
.	O
</s>
<s>
MT63	B-Device
has	O
been	O
promoted	O
as	O
a	O
modulation	O
format	O
for	O
Time	O
Signal	O
Stations	O
,	O
but	O
the	O
implied	O
system	O
does	O
not	O
use	O
Varicode	B-General_Concept
.	O
</s>
