|
-The band 17700 – 19700 MHz is allocated to the Fixed service on a primary basis.
-The band 17700 – 19700 MHz is also allocated to other services as follows:
17700-18400: FIXED –SATELLITE (Earth –to- space) (space – to- Earth), MOBILE
18400-18600: FIXED –SATELLITE (space – to- Earth), MOBILE
18600-18800: FIXED –SATELLITE (space – to- Earth), MOBILE except aeronautical mobile, EARTH EXPLORATION-SATELLITE (passive), Space research (passive)
18800-19300: FIXED –SATELLITE (space – to- Earth), MOBILE
19300-19700: FIXED –SATELLITE (Earth –to- space) (space – to- Earth), MOBILE
The band 17700 - 19700MHz
a/
Note:
·This radio – frequency channel arrangement complies with Recommendation ITU-R F. 595-4, 1997
·Application: digital microwave systems:
W: point-to-point, broadband, transmission capacity 140Mb/s and 155Mb/s
N(P-P): point-to-point, narrow band, transmission capacity 8Mb/s
·Minimum transmission distance: No limit
·The centre frequencies in MHz of individual channels are expressed by the following relationships:
W:
fn = fo - 1000 + 110n fo = 18700MHz
f’n = fo + 10 + 110n n = 1,2,3,4,5,6,7,8
N(P-P):
fn = fo- 130+ 20n fo = 18700MHz
f’n = fo -10+ 20n n = 1,2,3,4,5,6
b/
Note:
·This radio – frequency channel arrangement complies with Recommendation ITU-R F. 595-4, 1997
·Application: digital microwave systems:
N1(P-P): point-to-point, transmission capacity 34 Mb/s
N2(P-P): point-to-point, narrow band, transmission capacity 8 Mb/s
·Minimum transmission distance: No limit
·The centre frequencies in MHz of individual channels are expressed by the following relationships:
N1(P-P):fn = fo - 1000 + 27.5n fo = 18700MHz
f’n = fo + 10 + 27.5nn = 1,2,3,..., 35
The centre of main channels
N2(P-P): fn = fo- 130+ 20n fo = 18700MHz
f’n = fo -10+ 20n n = 1,2,3,4,5,6
|
Rfd.gov.vn is Loading ...
In bài
Gửi mail
Quay lại
Đầu trang