Žü”g”E‰ñüÝŒv (Frequency, Link Design)
‰^—pŽü”g” Operation Frequency
Œn“ | ’ÊM‚Ì•ûŒü | Žü”g” MHz |
‘—M“d—Í W |
Žü”g”‘шæ kHz |
•Ï’² Œ`Ž® |
•Î”g –Ê |
—p“r |
---|---|---|---|---|---|---|---|
UUC | ’n㨉q¯ | 435.*** | 50 | 10 | F1D | VH | ‰q¯‰^—p |
UUA | ’n㨉q¯ | 435.*** | 50 | 20 | F2D | VH | ’ÊMŽÀŒ±E‰^—pƒoƒbƒNƒAƒbƒv |
UDC | ‰q¯¨’nã | 437.385 | 0.8/0.8/0.1 | 20 /20 /0.5 | F1D /F2D /A1A | VH | ‰q¯‰^—p |
UDA | ‰q¯¨’nã | 437.505 | 0.01 | 0.52 | F2D | VH | ’ÊMŽÀŒ± |
‰ñüÝŒv Link Design
No. | Item | Unit | UDC« | UDA« | Comment | ||
---|---|---|---|---|---|---|---|
Modulation | F1D | F2D | A1A | F1D | |||
Format | TBD | TBD | Morse | WSJT | |||
(1) | Transmission frequency |
MHz | 437.385 | 437.505 | |||
(2) | Transmission power |
dBm | 29.0 | 29.0 | 20.0 | 10 | 0.8W, 0.1W & 0.01W |
(2a) | Bandwidth | kHz | 10.0 | 20.0 | 0.5 | 0.52 | |
(2b) | Maximum power density |
dBW/Hz | -44.0 | -44.0 | -37.0 | -47.2 | =(2)-10log(2a)-30 |
(3) | Transmitter feeder loss |
dB | 0.5 | 0.5 | |||
(4) | Transmitter antenna gain |
dBi | 0.0 | 0.0 | Mono Pole (=0.0dBi) | ||
(5) | EIRP | dBm | 28.5 | 19.5 | 9.5 | =(2)-(3)+(4) | |
(6) | Polarization loss | dB | 3.0 | 3.0 | |||
(7) | Communication distance |
km | 1097 | 2867 | 2867 | 2867 | Sat. Height=613 km |
(8) | Elevation Angle |
deg | 30 | 0 | 0 | 0 | |
(9) | Transmission loss in free space |
dB | 146.0 | 154.4 | 154.4 | 154.4 | =32.4+20log(f[MHz]) +20log(d[km]) |
(10) | Ionospheric absorption loss |
dB | 0.5 | 0.5 | 0.5 | 0.5 | |
(11) | Rainfall loss | dB | 0.1 | 0.1 | 0.1 | 0.1 | |
(12) | Antenna pointing loss |
dB | 0.2 | 0.2 | 0.2 | 0.2 | |
(13) | Receiver antenna gain |
dBi | 22.0 | 22.0 | 0.0 | 0.0 | Yagi Ant.(22dB) and Mono Pole (0dB) |
(14) | Receiver feeder loss |
dB | 1.0 | 1.0 | 1.0 | 1.0 | |
(15) | Receiver input signal power |
dBm | -99.8 | -108.1 | -139.2 | -149.2 | =(5)-(6)-(9)-(10)-(11)-(12) +(13)-(14) |
(16) | Receiver noise power density |
dBm/Hz | -164.8 | -164.8 | -164.8 | -164.8 | -123 dBm(Typ)@3kHz. Note (A) |
(17) | C/N0 (Expected) | dBHz | 56.8 | 48.4 | 33.4 | 23.2 | =(15)-(16)-10*log10(BW/3kHz) |
(18) | Loss in mod/ demod proc. |
dB | 3 | 3 | 3 | -20 | Minus sign shows GAIN |
(19) | Noise bandwidth | dBHz | 39.8 | 30.8 | 10.0 | 12.1 | =10log(Bit Rate) |
(20) | Eb/N0 | dB | 13.3 | 13.3 | 13.3 | 13.3 | FSK, BER=1e-5 |
(21) | S/N0 | dB | 53.1 | 44.1 | 23.3 | 25.4 | =(19)+(20) |
(22) | C/N0 (Required) | dBHz | 56.1 | 47.1 | 26.3 | 5.4 | =(18)+(21) |
(23) | Link margin | dB | 0.6 | 1.3 | 7.1 | 17.9 | =(17)-(22) |
No. | Item | Unit | UUCª | UUAª | Comment |
---|---|---|---|---|---|
Modulation | F1D | F2D | |||
Format | Ori. | Ori. | |||
(1) | Transmission frequency |
MHz | 435.*** | 435.280 | |
(2) | Transmission power |
dBm | 47.0 | 47.0 | 50W |
(2a) | Bandwidth | kHz | 10.0 | 20.0 | |
(2b) | Maximum power density |
dBW/Hz | -23.0 | -26.0 | =(2)-10log(2a)-30 |
(3) | Transmitter feeder loss |
dB | 6.0 | ||
(4) | Transmitter antenna gain |
dBi | 15.0 | Yagi Ant. (15dB) | |
(5) | EIRP | dBm | 56.0 | 56.0 | =(2)-(3)+(4) |
(6) | Polarization loss | dB | 3.0 | ||
(7) | Communication distance |
km | 2867 | 2867 | Sat. Height=600 km |
(8) | Elevation Angle |
deg | 0 | 0 | |
(9) | Transmission loss in free space |
dB | 154.3 | 154.3 | =32.4+20log(f[MHz]) +20log(d[km]) |
(10) | Ionospheric absorption loss |
dB | 0.5 | 0.5 | |
(11) | Rainfall loss | dB | 0.1 | 0.1 | |
(12) | Antenna pointing loss |
dB | 0.2 | 0.2 | |
(13) | Receiver antenna gain |
dBi | 0.0 | 0.0 | Mono Pole (=0.0 dBi) |
(14) | Receiver feeder loss |
dB | 0.5 | 0.5 | |
(15) | Receiver input signal power |
dBm | -102.1 | -102.2 | =(5)-(6)-(9)-(10)-(11)-(12) +(13)-(14) |
(16) | Receiver noise power density |
dBm/Hz | -164.8 | -164.8 | -123 dBm(Typ)@3kHz. Note (A) |
(17) | C/N0 (Expected) | dBHz | 57.4 | 54.4 | =(15)-(16)-10*log10(BW/3kHz) |
(18) | Loss in mod/ demod proc. |
dB | 3 | 3 | |
(19) | Noise bandwidth | dBHz | 30.8 | 30.8 | =10log(Bit Rate) |
(20) | Eb/N0 | dB | 13.3 | 13.3 | FSK, BER=1e-5 |
(21) | S/N0 | dB | 44.1 | 44.1 | =(19)+(20) |
(22) | C/N0 (Required) | dBHz | 47.1 | 47.1 | =(18)+(21) |
(23) | Link margin | dB | 10.3 | 7.3 | =(17)-(22) |