| Presentation | 1997/7/24 A Study on Variable EIRP Transponder for 21GHz-band Broadcasting Satellites Hitoshi NAKAGAWA, Jun MATSUMOTO, Kazuyoshi SHOGEN, Yoji MORISHITA, |
|---|---|
| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We have been studying a variable EIRP transponder system as a method of overcoming rain attenuation for 21GHz-band satellite broadcasting systems. To realize a variable-output transponder output power of which varies from 70 to 430 W, we are considering parallel operation of TWTs. Power loss at the combiner due to phase difference between two TWTs and bandwidth restriction due to the difference of path length have been evaluated. We have compared the output phases and power consumption of the TWT with and without cathode current adjustment at the same output power. The results show that the power consumption of the TWT can be reduced by the cathode current adjustment keeping the TWT at saturation. The output power of two 21GHz-band TWTs has been combined, and the maximum power of more than 430 W has been obtained. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Broadcasting satellite / 21GHz-band / variable EIRP transponder / TWT / parallel operation / rain attenuation |
| Paper # | CQ97-24 |
| Date of Issue |
| Conference Information | |
| Committee | CQ |
|---|---|
| Conference Date | 1997/7/24(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Communication Quality (CQ) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Variable EIRP Transponder for 21GHz-band Broadcasting Satellites |
| Sub Title (in English) | |
| Keyword(1) | Broadcasting satellite |
| Keyword(2) | 21GHz-band |
| Keyword(3) | variable EIRP transponder |
| Keyword(4) | TWT |
| Keyword(5) | parallel operation |
| Keyword(6) | rain attenuation |
| 1st Author's Name | Hitoshi NAKAGAWA |
| 1st Author's Affiliation | NHK Science and Technical Research Laboratories() |
| 2nd Author's Name | Jun MATSUMOTO |
| 2nd Author's Affiliation | NHK Science and Technical Research Laboratories |
| 3rd Author's Name | Kazuyoshi SHOGEN |
| 3rd Author's Affiliation | NHK Science and Technical Research Laboratories |
| 4th Author's Name | Yoji MORISHITA |
| 4th Author's Affiliation | NHK Science and Technical Research Laboratories |
| Date | 1997/7/24 |
| Paper # | CQ97-24 |
| Volume (vol) | vol.97 |
| Number (no) | 189 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |