<s>
Submillimeter	B-Algorithm
amateur	I-Algorithm
radio	I-Algorithm
refers	O
to	O
Amateur	O
radio	O
activity	O
in	O
the	O
sub-millimeter	B-Architecture
region	O
(	O
275GHz	O
to	O
30THz	O
)	O
of	O
the	O
electromagnetic	O
spectrum	O
.	O
</s>
<s>
While	O
no	O
international	O
frequency	B-Algorithm
allocations	I-Algorithm
exist	O
for	O
amateur	O
radio	O
in	O
the	O
sub-millimeter	B-Architecture
region	O
,	O
a	O
number	O
of	O
administrations	O
permit	O
radio	O
amateurs	O
to	O
experiment	O
on	O
Terahertz	O
frequencies	O
.	O
</s>
<s>
Amateurs	O
who	O
operate	O
in	O
the	O
region	O
must	O
design	O
and	O
construct	O
their	O
own	O
equipment	O
,	O
and	O
those	O
who	O
do	O
,	O
often	O
attempt	O
to	O
set	O
communication	O
distance	O
records	O
on	O
sub-millimeter	B-Architecture
frequencies	O
.	O
</s>
<s>
In	O
the	O
ITU	O
Table	O
of	O
Frequency	B-Algorithm
Allocations	I-Algorithm
,	O
no	O
formal	O
allocation	O
to	O
any	O
radio	O
service	O
is	O
present	O
above	O
275GHz	O
,	O
although	O
the	O
regulations	O
themselves	O
cover	O
up	O
to	O
3000GHz	O
(	O
3	O
THz	O
)	O
.	O
</s>
<s>
The	O
current	O
frequency	B-Algorithm
plan	I-Algorithm
for	O
German	O
amateurs	O
includes	O
that	O
frequency	O
ranges	O
444	O
–	O
453GHz	O
,	O
510	O
–	O
546GHz	O
,	O
711	O
–	O
730GHz	O
,	O
909	O
–	O
926GHz	O
,	O
945	O
–	O
951GHz	O
and	O
frequencies	O
above	O
956GHz	O
can	O
be	O
used	O
by	O
the	O
amateur	O
radio	O
service	O
.	O
</s>
<s>
They	O
achieved	O
a	O
distance	O
of	O
on	O
411GHz	O
,	O
using	O
SSB	B-Device
voice	O
transmissions	O
.	O
</s>
<s>
On	O
March	O
4	O
,	O
2003	O
,	O
US	O
stations	O
WA1ZMS	O
and	O
W4WWQ	O
set	O
a	O
new	O
distance	O
record	O
of	O
on	O
322GHz	O
,	O
using	O
wide-band	O
frequency	B-Application
modulation	I-Application
.	O
</s>
