ITU
搜尋結果：找到 7840 筆資料
- 【組 織】ITU
- 【文件編號】ITU-R SM.856-1
New Spectrally Efficient Techniques and Systems
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R M.821-1
Optional Expansion of the Digital Selective-Calling System for Use in the Maritime Mobile Service
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R SM.1235
Performance Functions for Digital Modulation Systems in an Interference Environment
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R M.1230
Performance Objectives for Space-to-Earth Links Operating in the Mobile-Satellite Service with Non-Geostationary Satellites in the 137-138 MHz Bands
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R M.1229
Performance Objectives for the Digital Aeronautical Mobile-Satellite Service (AMSS) Channels Operating in the Bands 1 525 to 1 559 MHz and 1 626.5 to 1 660.5 MHz Not Forming Part of the ISDN
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R SA.1273
Power Flux-Density Levels from the Space Research, Space Operation and Earth Exploration-Satellite Services at the Surface of the Earth Required to Protect the Fixed Service in the Bands 2 025-2 110 MHz and 2 200-2 290 MHz
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R QUESTION 221/7
Preferred frequency bands and protection criteria for space research service observations (passive)
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R BS.1285
Pre-Selection Methods for the Subjective Assessment of Small Impairments in Audio Systems
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R QUESTION 202-1/7
Protection criteria and frequency sharing between space very long baseline interferometry and other space research systems
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
- 【組 織】ITU
- 【文件編號】ITU-R F.1334
Protection Criteria for Systems in the Fixed Service Sharing the Same Frequency Bands in the 1 to 3 GHz Range with the Land Mobile Service
- 【日 期】1997/1/1
- 【語 言】English
- 【狀 態】Active
