1. ‫‪TEST REPORT‬‬ ‫‪LNB‬‬
‫‪Max Communication LNBF‬‬
‫‪models 801, 802, 804 and 804-s‬‬
‫ﺑﻤﻌﺪﻝ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 3ﺭ0 ﺩﻳﺴﻴﺒﻞ ﺑﻴﻨﻤﺎ ﻛﺎﻥ‬ ‫ﺍﻟﺮﻳﺴﻴﻔﺮ ﻣﻮﺩﻳﻞ ‪ GR-7400CI‬ﻭ ﻟﻘﺪ ﻛﺎﻧﺖ‬ ‫ﻭ ﻟﻘﺪ ﻗﻤﻨﺎ ﺑﻘﻴﺎﺱ ﻗﻮﺓ ﻣﺨﺎﺭﺝ ﺍﻹﺷﺎﺭﺓ ﻣﻦ ﻭﺣﺪﺓ‬
‫ﻫﻨﺎﻙ ﺗﻔﻮﻕ ﻭﺍﺿﺢ ﻋﻠﻰ ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﺘﻰ ﺗﻌﻤﻞ‬ ‫ﺍﻟﻨﺘﺎﺋﺞ ﻣﻘﺎﺭﺑﺔ ﻟﻠﻨﺘﺎﺋﺞ ﺍﻟﺘﻰ ﺣﺼﻠﻨﺎ ﻋﻠﻴﻬﺎ‬ ‫ﺍﻝ ‪ LNBF‬ﻭ ﺍﻟﺘﻰ ﺗﻘﺎﺭﺏ ﻗﺪﺭﺓ ﺍﻟﻜﺴﺐ ﻟﻠﻮﺣﺪﺓ ﻣﻊ‬
‫ﺑﻤﻌﺪﻝ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 8ﺭ0 ﺩﻳﺴﻴﺒﻞ .‬ ‫ﺑﺎﺳﺘﺨﺪﺍﻡ ﻣﻌﺪﺍﺕ ﻗﻴﺎﺱ ﺍﻛﺜﺮ ﺗﻌﻘﻴﺪﺍ ﻭ ﻏﺎﻟﻴﺔ‬ ‫ﺍﺳﺘﺜﻨﺎء ﺍﻹﺷﺎﺭﺓ ﺍﻟﺮﻗﻤﻴﺔ ﻣﻦ ﻗﻨﺎﺓ ) ‪ ( DCP‬ﻓﻘﺪ‬
‫ﺍﻟﺜﻤﻦ .‬ ‫ﻗﻤﻨﺎ ﺑﻘﻴﺎﺱ ﻣﺴﺘﻮﻯ ﻧﻄﺎﻕ ﺍﻹﺷﺎﺭﺓ ﻭ ﻗﺪ ﺣﺼﻠﻨﺎ‬
‫ﻭ ﺃﺛﻨﺎء ﺍﻻﺧﺘﺒﺎﺭ ﻟﻢ ﻧﻼﺣﻆ ﺇﻯ ﻓﺎﺭﻕ ﺑﻴﻦ‬ ‫ﻋﻠﻰ ﺍﻟﻘﻴﻤﺔ ﺑﻤﻘﺪﺍﺭ ‪ dBµV‬ﻭ ﺇﺫﺍ ﺃﺭﺩﺕ ﻗﻴﺎﺳﻬﺎ‬
‫ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﺜﻨﺎﺋﻴﺔ ﺍﻟﻤﺨﺎﺭﺝ ﺃﻭ ﺍﻟﺮﺑﺎﻋﻴﺔ ﺍﻟﻤﺨﺎﺭﺝ‬ ‫ﻣﻨﺎﻗﺸﺔ ﺍﻟﻨﺘﺎﺋﺞ‬ ‫ﺑﻤﻘﺪﺍﺭ ‪ dBm‬ﻗﻢ ﺑﻄﺮﺡ 901 ﺩﺭﺟﺔ ﻣﻦ ﺍﻟﻘﻴﻢ‬
‫ﻓﻜﺎﻧﺖ ﺟﻮﺩﺓ ﻭ ﺷﺪﺓ ﺍﻹﺷﺎﺭﺓ ﺍﻟﻤﺴﺘﻘﺒﻠﺔ ﻣﻄﺎﺑﻘﺔ‬ ‫ﺍﻟﺘﻰ ﺣﺼﻠﺖ ﻋﻠﻴﻬﺎ ) ﻛﻤﺜﺎﻝ ﻗﻴﻤﺔ 07+ ‪dBµV‬‬
‫ﺑﻐﺾ ﺍﻟﻨﻈﺮ ﻋﻦ ﺃﻯ ﻣﺨﺮﺝ ﻛﺎﻥ ﻳﺘﻢ ﺇﺟ ﺮﺍء‬ ‫ﻛﻤﺎ ﻳﻤﻜﻨﻚ ﻣﺸﺎﻫﺪﺓ ﺍﻟﺮﺳﻢ ﺭﻗﻢ 1 ﻓﻴﻮﺟﺪ ﺗﻔﺎﻭﺕ‬ ‫ﺗﺴﺎﻭﻯ 93- ‪ ( dBm‬ﻭ ﺑﺠﺎﻧﺐ ﺍﻟﺤﺼﻮﻝ ﻋﻠﻰ‬
‫ﺍﻻﺧﺘﺒﺎﺭ ﻋﻠﻴﺔ .‬ ‫ﻓﻰ ﻣﻘﺪﺍﺭ ﻗﻮﺓ ﻣﺨﺎﺭﺝ ﺍﻟﻄﺎﻗﺔ ﻟﻮﺣﺪﺍﺕ ﺍﻝ ‪LNBF‬‬ ‫ﺍﻟﻘﻴﺎﺳﺎﺕ ﺍﻹﻟﻜﺘﺮﻭﻧﻴﺔ ﺃﺭﺩﻧﺎ ﺃﻥ ﻧﻘﻮﻡ ﺑﺎﺧﺘﺒﺎﺭ‬
‫ﻋﻨﺪ ﺍﻻﺧﺘﺒﺎﺭ ﺣﻮﺍﻟﻰ 5 ﺩﻳﺴﻴﺒﻞ ، ﻭ ﺣﻴﺚ ﺃﻥ‬ ‫ﺍﻟﻮﺣﺪﺓ ﺑﻄﺮﻳﻘﺔ ﻓﻌﻠﻴﺔ ﻋﻦ ﻃﺮﻳﻖ ﺍﺳﺘﺨﺪﺍﻡ‬
‫ﻣﻌﺪﻝ ﺍﻟﻜﺴﺐ ﻣﻦ 05 ﺇﻟﻰ 06 ﺩﻳﺴﻴﺒﻞ ﻓﺎﻥ ﻫﺬﺍ‬ ‫ﺭﻳﺴﻴﻔﺮ ﺣﻘﻴﻘﻰ ﻭ ﺍﺳﺘﺨﺪﻣﻨﺎ ﺍﻟﺮﻳﺴﻴﻔﺮ ﻣﻮﺩﻳﻞ‬
‫ﺍﻟﺘﻔﺎﻭﺕ ﻃﺒﻴﻌﻰ ﻭ ﻟﻬﺬﺍ ﻓﺎﻥ ﺍﻟﻨﺘﻴﺠﺔ ﺍﻟﺘﻰ ﻧﺪﻭﻧﻬﺎ‬ ‫‪ SDN GR-7400CI‬ﻭ ﻫﺬﺍ ﺍﻟﺮﻳﺴﻴﻔﺮ ﺍﻟﺬﻯ‬
‫ﻫﻨﺎ ﻫﻮ ﺍﻧﻪ ﻻ ﻳﻮﺟﺪ ﻓﺎﺭﻕ ﺑﻴﻦ ﻭﺣﺪﺍﺕ ﺍﻝ ‪LNBF‬‬ ‫ﻗﺪﻣﻨﺎﻩ ﻓﻰ ﺍﻟﻌﺪﺩ ﺍﻟﺴﺎﺑﻖ ﻣﻦ ﻣﺠﻠﺔ ﺗﻴﻠﻰ ﺳﺘﻼﻳﺖ‬
‫ﺍﻟﺘﻰ ﺗﻨﺘﺠﻬﺎ ﺷﺮﻛﺔ ‪Max Communication‬‬ ‫ﺍﻟﺪﻭﻟﻴﺔ ﺣﻴﺚ ﻳﻄﻬﺮ ﻣﺴﺘﻮﻯ ﻗﻮﺓ ﺍﻹﺷﺎﺭﺓ ﺣﻴﺚ‬
‫ﻭ ﺍﻟﺸﺮﻛﺎﺕ ﺍﻟﻤﻨﺘﺠﺔ ﺍﻷﺧﺮﻯ ، ﻭ ﺍﻟﻨﺘﺎﺋﺞ ﺍﻷﻛﺜﺮ‬ ‫ﻳﻈﻬﺮ ﻗﻴﻢ ‪ Y-axis‬ﻭ ﻓﻰ ﻧﻔﺲ ﺍﻟﻮﻗﺖ ﻗﻴﻢ ‪dBµV‬‬
‫ﺃﻫﻤﻴﺔ ﻣﻮﺿﺤﺔ ﻓﻰ ﺍﻟﺮﺳﻢ ﺭﻗﻢ 2 ﻛﻤﺎ ﺗﺮﻯ ﻓﻬﻨﺎﻙ‬ ‫ﻭ ﺍﻟﻨﺴﺒﺔ ﺍﻟﻤﺌﻮﻳﺔ ﻓﻰ ﻧﻔﺲ ﺍﻟﻮﻗﺖ ﻭ ﺑﺎﻟﻄﺒﻊ ﺇﻥ‬
‫ﺗﻔﺎﻭﺕ ﻛﺒﻴﺮ ﻓﻰ ﺟﻮﺩﺓ ﺍﻹﺷﺎﺭﺓ ﺑﻴﻦ ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﺘﻰ‬ ‫ﺃﻫﻢ ﻣﻘﻴﺎﺱ ﻫﻮ ﻣﻘﻴﺎﺱ ﻗﻴﻢ ‪ C/N‬ﻋﻠﻰ ﺍﻟﺮﻏﻢ ﻣﻦ‬
‫ﺗﻌﻤﻞ ﺑﻤﻌﺪﻝ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 8ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻭ‬ ‫ﺻﻌﻮﺑﺔ ﻗﻴﺎﺳﻪ ﻋﻠﻰ ﺍﻹﺷﺎ ﺭﺍﺕ ﺍﻟﻔﺎﻋﻠﺔ ﺣﻴﺚ ﺃﻥ‬
‫ﺍﻷﺧﺮﻯ ﺍﻟﺘﻰ ﺗﻌﻤﻞ ﺑﻤﻌﺪﻝ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 3ﺭ0‬ ‫ﻃﻴﻒ ﺍﻟﺘﺮﺩﺩ ﻳﺸﻐﻞ ﺑﺎﻟﻜﺎﻣﻞ ﻣﻦ ﻗﺒﻞ ﺍﻟﻨﺎﻗﻞ ﻭ‬
‫ﺩﻳﺴﻴﺒﻞ ، ﻭ ﺇﺫﺍ ﻛﺎﻥ ﻣﻌﺪﻝ ﺧﻄﺎء ﺍﻟﻨﺒﻀﺎﺕ‬ ‫ﻫﺬﺍ ﻳﺤﺪﺙ ﻣﺸﻜﻠﺔ ﻓﻰ ﺍﻟﻘﻴﺎﺱ ﻭ ﺇﺫﺍ ﺳﺄﻟﻨﺎ ﻣﺸﻐﻞ‬
‫ﻟﻠﻘﻨﻮﺍﺕ ﻏﻴﺮ ﻛﺎﻓﻰ ﻟﻚ ﺍﻧﻈﺮ ﺇﻟﻰ ﺍﻟﺮﺳﻢ ﺭﻗﻢ 3‬ ‫ﺍﻟﻘﻤﺮ ﺍﻟﺼﻨﺎﻋﻰ ﻓﻰ ﺃﻥ ﻳﺘﻢ ﻗﻔﻞ ﻭ ﻓﺘﺢ ﺇﺷﺎ ﺭﺍﺕ‬
‫ﺍﻟﺬﻯ ﻳﻮﺿﺢ ﺩﺭﺟﺔ ﺟﻮﺩﺓ ﻗ ﺮﺍءﺓ ﺃﺟﻬﺰﺓ ﺍﻟﺮﻳﺴﻴﻔﺮ‬ ‫ﺍﻟﻨﺎﻗﻞ ﻋﻨﺪﻣﺎ ﻧﺮﻳﺪ ﻓﻬﺎﺫ ﺳﻮﻑ ﻳﺴﺎﻋﺪﻧﺎ ﻓﻰ ﺣﻞ‬
‫ﻓﺎﻟﻘ ﺮﺍءﺍﺕ ﺗﺤﺖ %04 ﺗﻌﻨﻰ ﻭﺟﻮﺩ ﺗﺸﻮﻩ ﻛﺒﻴﺮ ﻓﻰ‬ ‫ﻣﺸﻜﻠﺔ ﺍﻟﻘﻴﺎﺱ ﻭ ﻋﻠﻰ ﺃﻯ ﺣﺎﻝ ﻓﻠﻘﺪ ﺷﻜﻜﻨﺎ ﻓﻰ‬
‫ﺍﻻﺳﺘﻘﺒﺎﻝ ﻓﻰ ﺗﻠﻚ ﺍﻷﺟﻬﺰﺓ .‬ ‫ﺇﻣﻜﺎﻧﻴﺔ ﺗﻌﺎﻭﻧﻬﻢ ﻣﻌﻨﺎ ﻓﻰ ﻫﺬﺍ ﺍﻷﻣﺮ ﻓﻜﺎﻥ ﻋﻠﻴﻨﺎ‬
‫ﺃﻥ ﻧﻘﻮﻡ ﺑﻌﻤﻞ ﺍﻟﻘﻴﺎﺱ ﺑﻄﺮﻳﻘﺔ ﻣﺨﺘﻠﻔﺔ ﻓﺒﺪﻻ ﻣﻦ‬
‫ﻭ ﻛﺎﻥ ﻳﻤﻜﻨﻨﺎ ﺃﻥ ﻧﺴﺘﻨﺘﺞ ﺃﻥ ﻭﺣﺪﺍﺕ ﺍﻝ‬ ‫ﺍﻟﺤﺼﻮﻝ ﻋﻠﻰ ﻗﻴﻢ ‪ C/N‬ﻓﻘﺪ ﻗﻤﻨﺎ ﺑﻘﻴﺎﺱ ﻣﻌﺪﻝ‬
‫‪ LNBF‬ﺍﻟﺜﻨﺎﺋﻴﺔ ﺗﻌﻄﻰ ﻧﺘﺎﺋﺞ ﺍﻓﻀﻞ ﻣﻦ ﺍﻟﻮﺣﺪﺍﺕ‬ ‫ﺧﻄﺄ ﻧﺒﻀﺎﺕ ﺇﺭﺳﺎﻝ ﺍﻟﻘﻨﺎﺓ ‪ BER‬ﻭ ﻫﺬﺍ ﻳﻌﻄﻴﻨﺎ‬
‫ﺍﻟﺮﺑﺎﻋﻴﺔ ﺍﻟﻤﺨﺎﺭﺝ ﺃﺛﻨﺎء ﺍﻻﺧﺘﺒﺎﺭ ﻭ ﻟﻜﻦ ﺣﻴﺚ‬ ‫ﻛﻴﻔﻴﺔ ﺣﺪﻭﺙ ﺃﺧﻄﺎء ﻓﻰ ﺍﻟﻨﺒﻀﺎﺕ ) ﻧﺘﻴﺠﺔ‬
‫ﺣﻞ ﻋﻠﻴﻨﺎ ﺍﻟﻠﻴﻞ ﻗﺒﻞ ﺍﻻﻧﺘﻬﺎء ﻣﻦ ﺍﻻﺧﺘﺒﺎﺭ ﻓﻘﺪ‬ ‫ﻟﻠﻀﻮﺿﺎء ﻭ ﺍﻟﺘﺪﺍﺧﻞ ( ﻓﻰ ﺑﻴﺎﻧﺎﺕ ﺍﻹﺭﺳﺎﻝ ،‬
‫ﺃﺭﺩﻧﺎ ﺇﻋﺎﺩﺓ ﺍﻟﻨﺘﺎﺋﺞ ﻣﻊ ﻭﺣﺪﺍﺕ ﺛﻨﺎﺋﻴﺔ ﺍﻟﻤﺨﺎﺭﺝ‬ ‫ﺇﻥ ﺍﻹﺷﺎﺭﺓ ﺍﻟﺘﻰ ﺗﻌﻄﻰ ﻣﻘﻴﺎﺱ ﺧﻄﺎء ﻧﺒﻀﺎﺕ‬
‫ﻭ ﻛﺎﻧﺖ ﺍﻟﻨﺘﻴﺠﺔ ﻫﺬﻩ ﺍﻟﻤﺮﺓ 4-01‪ 90X‬ﻭ ﻛﺎﻧﺖ‬ ‫4-01‪ 1x‬ﺗﻌﺘﺒﺮ ﺟﻴﺪﺓ ﺟﺪﺍ ﻭ ﻫﺬﺍ ﻣﺎ ﻳﺴﻤﻰ ‪QEF‬‬
‫ﺟﻮﺩﺓ ﺍﻹﺷﺎﺭﺓ %07 ﻭ ﻛﺎﻧﺖ ﺍﻟﻨﺘﺎﺋﺞ ﺃﺳﻮء ﻗﻠﻴﻼ‬ ‫ﻓﻰ ﺍﺧﺘﺒﺎﺭﻧﺎ ﻭ ﻣﻌﻨﺎﻩ ) ﻣﻘﻴﺎﺱ ﺧﻠﻮ ﺍﻷﺧﻄﺎء ( ﻭ‬
‫ﻣﻦ ﻧﺘﺎﺋﺞ ﻭﺣﺪﺍﺕ ﺍﻝ ‪ LNBF‬ﺍﻟﻤﻔﺮﺩﺓ ﺍﻟﻤﺨﺎﺭﺝ‬ ‫ﻗﻤﻨﺎ ﺑﺎﺳﺘﻘﺒﺎﻝ ﻗﻨﻮﺍﺕ ﺑﻤﻌﺪﻝ ﺧﻄﺎء ﻓﻰ ﺍﻟﻨﺒﻀﺎﺕ‬
‫ﻣﻊ ﺍﻷﺧﺬ ﻓﻰ ﺍﻻﻋﺘﺒﺎﺭ ﺃﻥ ﺟﻤﻴﻊ ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﻤﻘﺪﻣﺔ‬ ‫ﻋﺎﻟﻰ ) ﺍﻹﺷﺎ ﺭﺍﺕ ﺿﻌﻴﻔﺔ ﻭ ﺑﻬﺎ ﺿﻮﺿﺎء ( ﻭ ﻟﻜﻦ‬
‫ﻣﻦ ﺷﺮﻛﺔ ‪ Max Communication‬ﺑﻨﻔﺲ‬ ‫ﻣﺎﺯﻟﻨﺎ ﻧﺤﺼﻞ ﻋﻠﻰ ﺻﻮﺭﺓ ﻭ ﺻﻮﺕ ﺟﻴﺪ ﺑﺪﻭﻥ ﺃﻯ‬
‫ﻣﺴﺘﻮﻯ ﺧﻔﺾ ﺍﻟﺸﻮﺷﺮﺓ 3ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻭ ﻟﻠﺘﺄﻛﺪ‬ ‫ﺗﺸﻮﻩ ﻣﻠﺤﻮﻅ ﻭ ﻫﺬﺍ ﻧﺘﻴﺠﺔ ﺃﻥ ﻛﻞ ﺟﻬﺎﺯ ﺭﻳﺴﻴﻔﺮ‬
‫ﻣﻦ ﺫﻟﻚ ﻗﻤﻨﺎ ﺑﺎﺧﺘﺒﺎﺭ ﻧﻔﺲ ﺍﻹﺷﺎﺭﺓ ﻣﻦ ﺍﻟﻘﻤﺮ‬ ‫ﺭﻗﻤﻰ ﺑﻪ ﻣﺎ ﻳﺴﻤﻰ ﺑﻮﻇﻴﻔﺔ ﺗﺼﺤﻴﺢ ﺍﻷﺧﻄﺎء ﻓﻰ‬
‫‪ Sirius‬ﺑﺎﺳﺘﺨﺪﺍﻡ ﻭﺣﺪﺓ ﺭﺑﺎﻋﻴﺔ ﻭ ﻛﺎﻧﺖ ﺗﻠﻚ‬ ‫ﺍﻹﺭﺳﺎﻝ ﺍﻟﺘﻠﻴﻔﺰﻳﻮﻧﻰ ﺍﻟﺮﻗﻤﻰ .‬
‫ﺍﻟﻮﺣﺪﺓ ﺑﻤﻌﺪﻝ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 4ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻭ‬ ‫ﻭ ﻋﻤﻮﻣﺎ ﺇﺫﺍ ﻛﺎﻧﺖ ﺍﻷﺧﻄﺎء ﻓﻰ ﻧﺒﻀﺎﺕ‬
‫ﻗﻤﻨﺎ ﺑﺘﺮﻛﻴﺒﻬﺎ ﻋﻠﻰ ﻃﺒﻖ ﻳﻘﻄﺮ 09ﺳﻢ ﻭ ﺣﺼﻠﻨﺎ‬ ‫ﺍﻹﺭﺳﺎﻝ ﺍﻟﺮﻗﻤﻰ ﻛﺒﻴﺮﺓ ﺟﺪﺍ ﻓﺎﻥ ﻭﻇﻴﻔﺔ ﺗﺼﺤﻴﺢ‬
‫ﻋﻠﻰ ﻣﻌﺪﻝ ﺧﻄﺎء ﻧﺒﻀﺎﺕ 4-01‪ 70X‬ﻭ ﺟﻮﺩﺓ‬ ‫ﺍﻷﺧﻄﺎء ﻓﻰ ﺟﻬﺎﺯ ﺍﻟﺮﻳﺴﻴﻔﺮ ﻟﻦ ﺗﻤﻜﻨﻪ ﻣﻦ ﺇﻋﺎﺩﺓ‬
‫ﺍﻹﺷﺎﺭﺓ ﺑﻤﻘﺪﺍﺭ %07 ﻭ ﺑﻬﺬﺍ ﻻ ﻳﻜﻮﻥ ﻫﻨﺎﻙ‬ ‫ﺑﻨﺎء ﺍﻟﺼﻮﺭﺓ ﻭ ﺍﻟﺼﻮﺕ ﺑﻄﺮﻳﻘﺔ ﺟﻴﺪﺓ .‬
‫ﻓﺎﺭﻕ ﺣﻘﻴﻘﻰ ﺑﻴﻦ ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﺘﻰ ﺗﻌﻤﻞ ﺑﻤﻘﺪﺍﺭ‬
‫ﺧﻔﺾ ﺷﻮﺷﺮﺓ 4ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻭ ﺍﻷﺧﺮﻯ ﺍﻟﺘﻰ ﺗﻌﻤﻞ‬ ‫ﻭ ﻟﻘﺪ ﻗﻤﻨﺎ ﺑﺘﺪﻭﻳﻦ ﻗ ﺮﺍءﺍﺕ ﻗﻴﺎﺱ ﺍﻹﺷﺎ ﺭﺍﺕ ﻣﻦ‬
‫‪TELE-satellite International — www.TELE-satellite.com‬‬

2. ‫‪LNB‬‬ ‫‪TEST REPORT‬‬
‫‪Figure 1. Signal strength‬‬ ‫.2 ‪Figure‬‬
‫‪measurements and set-top-box readings‬‬ ‫‪Channel BER measurements‬‬
‫" ﺍﻟﺸﺎﻣﻠﺔ " ﻓﺈﻧﻬﺎ ﺗﺴﺘﻘﺒﻞ ﺟﻤﻴﻊ ﺣﻴﺰ ﺗﺮﺩﺩﺍﺕ‬ ‫ﺧﻔﺾ ﺷﻮﺷﺮﺓ 1 ﺃﻭ ﺣﺘﻰ 2ﺭ1 ﺩﻳﺴﻴﺒﻞ ﻭ ﻛﺎﻥ ﻫﺬﺍ‬
‫‪ Ku-band‬ﺣﻴﺚ ﺇﻥ ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﺸﺎﻣﻠﺔ ﺑﻬﺎ ﻋﺪﺩ‬ ‫ﻳﻌﺘﺒﺮ ﺟﻴﺪﺍ ﻭ ﻟﻜﻦ ﺃﻻﻥ ﺗﻮﻓﺮ ﺍﻟﺸﺮﻛﺎﺕ ﺍﻟﻤﻨﺘﺠﺔ‬
‫2 ﻣﺬﺑﺬﺏ ﻣﺤﻠﻰ ﻣﻦ 057.9 ﺍﻟﻰ 006.01‬ ‫ﺍﻟ ﺮﺍﺋﺪﺓ ﻣﻌﺪﻝ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 3ﺭ0 ﺩﻳﺴﻴﺒﻞ .‬
‫ﺟﻴﺠﺎﻫﻴﺮﺗﺰ ﻭ ﺍﻟﺸﻰء ﺍﻷﻫﻢ ﺃﻥ ﻣﻌﺪﻝ ﺧﻔﺾ‬
‫ﺍﻟﺸﻮﺷﺮﺓ 3ﺭ0 ﺩﻳﺴﻴﺒﻞ .‬ ‫ﻓﺈﺫﺍ ﻛﻨﺖ ﻗﺪ ﻗﻤﺖ ﺑﺘﺮﻛﻴﺐ ﻭﺣﺪﺓ ﺧﻔﺾ ﺷﻮﺷﺮﺓ‬
‫ﻣﻦ ﻧﻮﻉ ‪ Ku-band‬ﻋﻠﻰ ﻃﺒﻖ ﻏﻴﺮ ﻣﻀﺒﻮﻁ‬
‫ﻭ ﻋﻨﺪ ﻓﺘﺢ ﻋﺒﻮﺓ ﺍﻟﻮﺣﺪﺓ ﻟﻢ ﻧﻼﺣﻆ ﺃﻯ ﺍﺧﺘﻼﻑ‬ ‫ﺍﻟﺒﺆﺭﺓ ﻣﻨﺬ 3 ﺃﻭ 4 ﺳﻨﻮﺍﺕ ﻣﻀﺖ ﺑﺎﺳﺘﺨﺪﺍﻡ ﻭﺣﺪﺓ‬
‫ﺑﻴﻨﻪ ﻭ ﺑﻴﻦ ﺍﻷﻧﻮﺍﻉ ﺍﻷﺧﺮﻯ ﺣﻴﺚ ﺃﻥ ﺍﻟﻐﻼﻑ‬ ‫‪ LNBF‬ﺑﻤﻘﺪﺍﺭ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 8ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻓﻬﻞ‬
‫ﺍﻟﺨﺎﺭﺟﻰ ﻟﻠﻮﺣﺪﺓ ﺍﻟﺜﻨﺎﺋﻴﺔ ﺍﻟﻤﺨﺎﺭﺝ ﻫﻮ ﻧﻔﺴﻪ‬ ‫ﻫﻨﺎﻙ ﺩﺍﻋﻰ ﺑﺎﻥ ﺗﺴﺘﺒﺪﻝ ﻫﺬﻩ ﺍﻟﻮﺣﺪﺓ ﺑﺄﺧﺮﻯ ﺗﻌﻤﻞ‬
‫ﺍﻟﺬﻯ ﻳﺴﺘﺨﺪﻡ ﻟﻠﻮﺣﺪﺍﺕ ﺍﻟﺮﺑﺎﻋﻴﺔ ﺍﻟﻤﺨﺎﺭﺝ ،‬ ‫ﺑﻤﻘﺪﺍﺭ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 3ﺭ0 ﺩﻳﺴﻴﺒﻞ ؟ ﻓﺈﺫﺍ ﻛﺎﻥ‬
‫.3 ‪Figure‬‬
‫ﻭ ﺟﻤﻴﻊ ﺍﻟﻮﺣﺪﺍﺕ ﺃﺗﺖ ﻣﺰﻭﺩﺓ ﺑﻐﻄﺎء ﻣﻄﺎﻃﻰ‬ ‫ﻟﺪﻳﻚ ﺑﻌﺾ ﺍﻟﺨﻠﻔﻴﺎﺕ ﻋﻦ ﺍﻷﺟﻬﺰﺓ ﺍﻹﻟﻜﺘﺮﻭﻧﻴﺔ‬ ‫‪Signal quality readings on a set-top-box‬‬
‫ﻟﻠﺤﻤﺎﻳﺔ ﻣﻮﺻﻼﺕ ﺍﻟﻜﺎﺑﻞ ﻣﻦ ﺍﻟﻤﻄﺮ ﻭ ﺍﻷﺗﺮﺑﺔ ،‬ ‫ﻓﻤﺜﻼ ﺍﻷﺟﻬﺰﺓ ﺍﻟﺼﻮﺗﻴﺔ ﻓﻴﻤﻜﻨﻚ ﺃﻥ ﺗﺘﻌﺠﺐ ﻣﻦ‬
‫ﻭ ﻟﻢ ﺗﻘﻮﻡ ﺍﻟﺸﺮﻛﺔ ﺍﻟﻤﺼﻨﻌﺔ ﺑﺘﻮﺿﻴﺢ ﺃﻯ ﺑﻴﺎﻧﺎﺕ‬ ‫ﺃﻥ ﻫﻨﺎﻙ ﺑﻌﺾ ﺍﻟﺘﻐﻴﻴ ﺮﺍﺕ ﻓﻰ ﺗﺤﺴﻴﻦ ﻣﺴﺘﻮﻯ‬
‫ﻳﻤﻜﻨﻚ ﺳﻤﺎﻉ‬
‫ﻓﻨﻴﺔ ﻋﻠﻰ ﺍﻟﻌﻠﺒﺔ ﺍﻟﺨﺎﺭﺟﻴﺔ .‬ ‫ﺍﻹﺷﺎﺭﺓ ﺇﻟﻰ ﺍﻟﻀﻮﺿﺎء ﺑﻤﻘﺪﺍﺭ 5ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻭ‬
‫ﻛﺎﻧﺖ ﺍﻟﻨﺘﺎﺋﺞ ﻣﺒﻬﺮﺓ ، ﻭ ﻟﻜﻦ ﻣﺴﺘﻮﻯ ﺍﻟﻀﻮﺿﺎء‬
‫ﺍﻻﺧﺘﺒﺎﺭ‬ ‫ﺑﺎﻟﻨﺴﺒﺔ ﻻﺳﺘﻘﺒﺎﻝ ﺍﻷﻗﻤﺎﺭ ﺍﻟﺼﻨﺎﻋﻴﺔ ﻣﺨﺘﻠﻒ‬
‫ﺃﻭﻻ ﺃﺭﺩﻧﺎ ﻣﻘﺎﺭﻧﺔ ﻭﺣﺪﺍﺕ ﺍﻝ ‪ LNBF‬ﺍﻟﻤﻘﺪﻣﺔ‬
‫ﺣﻴﺚ ﺃﻥ ﺍﻟﻤﺼﺪﺭ ﺍﻟﺤ ﺮﺍﺭﻯ ﻟﻴﺲ ‪ 290K‬ﻛﻤﺎ‬
‫ﻫﻮ ﻓﻰ ﺍﻻﺳﺘﻘﺒﺎﻝ ﺍﻷﺭﺿﻰ ﻭﻟﻜﻨﻪ ﺣﻮﺍﻟﻰ ‪30K‬‬ ‫ﺍﻟﻬﻤﺴﺎﺕ ﻣﻦ‬
‫ﺍﻟﺴﻤﺎء‬
‫ﻣﻦ ﺷﺮﻛﺔ ‪ Max Communication‬ﻣﻊ‬ ‫، ﻭ ﻫﺬﺍ ﻳﻌﻨﻰ ﺃﻥ ﻣﻘﺪﺍﺭ ﺗﺤﺴﻴﻦ ﻣﺴﺘﻮﻯ ﺍﻹﺷﺎﺭﺓ‬
‫ﺍﻟﻮﺣﺪﺍﺕ ﺍﻟﻤﻘﺪﻣﺔ ﻣﻦ ﺷﺮﻛﺎﺕ ﻣﻨﺘﺠﺔ ﺃﺧﺮﻯ ﻭ‬ ‫ﺇﻟﻰ ﺍﻟﻀﻮﺿﺎء ﺳﻮﻑ ﺗﻜﻮﻥ ﺣﻮﺍﻟﻰ 8ﺭ1 ﺩﻳﺴﻴﺒﻞ‬
‫ﻟﻘﺪ ﺍﺳﺘﺨﺪﻣﻨﺎ ﻭﺣﺪﺓ ‪ LNBF‬ﺛﻨﺎﺋﻴﺔ ﺑﻤﻌﺪﻝ ﺧﻔﺾ‬ ‫ﻭ ﺑﻬﺬﺍ ﻓﺎﻥ ﺍﻹﺷﺎ ﺭﺍﺕ ﺍﻟﻤﺴﺘﻘﺒﻠﺔ ﻣﻦ ﺍﻟﻨﻮﺍﻗﻞ‬
‫ﺿﻮﺿﺎء 8ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻗﺪﻳﻤﺔ ﻛﺎﻧﺖ ﺗﺴﺘﻌﻤﻞ‬ ‫ﺍﻟﻀﻌﻴﻔﺔ ﺳﻮﻑ ﺗﺘﺤﺴﻦ ﺑﺸﻜﻞ ﻛﺒﻴﺮ .‬
‫ﻣﻨﺬ ﺳﻨﻮﺍﺕ ، ﻭ ﻗﻤﻨﺎ ﺑﺎﺳﺘﺨﺪﺍﻡ ﻃﺒﻖ ﺣﻠﻘﻰ ﺑﻘﻄﺮ‬
‫09ﺳﻢ ﻭ ﻗﺪ ﺗﻢ ﺗﺮﻛﻴﺐ ﻭﺣﺪﺍ ﺍﻝ ‪ LNBF‬ﻋﻠﻰ‬ ‫ﺇﻥ ﺷﺮﻛﺔ ‪ Max Communication‬ﻗﺪﻣﺖ‬
‫ﺍﻟﺬ ﺭﺍﻉ ﺍﻟﺤﺎﻣﻞ ﻭﺍﺣﺪﺓ ﺗﻠﻮ ﺍﻷﺧﺮﻯ ﻭ ﺗﻢ ﺗﻮﺟﻴﻪ‬ ‫ﻟﻨﺎ ﻋﺪﺩ 4 ﻭﺣﺪﺍﺕ ﺧﻔﺾ ﺷﻮﺷﺮﺓ ﻣﻦ ﺍﻟﺴﻠﺴﻠﺔ‬ ‫ﺇﻥ ﺍﺧﺘﺼﺎﺭ ‪ LNB‬ﻣﻌﻨﺎﻩ " ﻭﺣﺪﺓ ﺧﻔﺾ‬
‫ﺍﻟﻄﺒﻖ ﻧﺤﻮ ﺍﻟﻘﻤﺮ 3/2 ‪ Sirius‬ﻋﻨﺪ ﺍﻟﻤﻮﻗﻊ 5‬ ‫ﺍﻟﺠﺪﻳﺪﺓ ﻣﻦ ﻣﻨﺘﺠﺎﺗﻬﺎ ﺑﻤﺨﺎﺭﺝ : ﻣﻔﺮﺩﺓ ،‬ ‫ﺍﻟﺸﻮﺷﺮﺓ " ﻭ ﻣﻌﻨﺎﻩ ﺇﻥ ﻣﺴﺘﻮﻯ ﺧﻔﺾ ﺍﻟﺸﻮﺷﺮﺓ‬
‫ﺩﺭﺟﺔ ﺷﺮﻕ ﻟﻼﺧﺘﺒﺎﺭ ﻭ ﻟﻘﺪ ﺍﺧﺘﺮﻧﺎ ﺇﺷﺎﺭﺓ ﺍﺿﻌﻒ‬ ‫ﺛﻨﺎﺋﻴﺔ ، ﻣﺨﺘﺼﺮﺓ ﻭ ﺭﺑﺎﻋﻴﺔ ، ﻭ ﺗﺴﻤﻰ ﻫﺬﻩ‬ ‫ﻫﻮ ﺃﻫﻢ ﺷﻰء ﻟﻬﺬﻩ ﺍﻟﻮﺣﺪﺓ ﻭ ﻛﺎﻥ ﻫﺬﺍ ﺻﺤﻴﺢ ﺃﺛﻨﺎء‬
‫ﻗﻨﺎﺓ ﻭ ﻫﻰ ) ‪ ( Europe BSS‬ﻭ ﻫﻰ ﻓﻰ‬ ‫ﺍﻟﺴﻠﺴﺔ ﺑﺎﻹﺻﺪﺍﺭ ﺍﻟﺒﻼﺗﻴﻨﻰ ﻭ ﻫﻰ ﻣﻮﺩﻳﻼﺕ‬ ‫ﺍﺳﺘﻘﺒﺎﻝ ﺍﻹﺭﺳﺎﻝ ﺍﻟﺘﻤﺎﺛﻠﻰ ﻭ ﻇﻞ ﺃﻳﻀﺎ ﺻﺤﻴﺤﺎ‬
‫ﻣﻨﺘﺼﻒ ﺣﻴﺰ ﺍﻝ ‪ Ku-band‬ﺑﺘﺮﺩﺩ 667.11‬ ‫408,208,108 ﻭ ‪ 804S‬ﺑﺎﻟﺘﺮﺗﻴﺐ ﻭ ﺟﻤﻴﻌﻬﺎ‬ ‫ﺃﺛﻨﺎء ﺍﻻﺳﺘﻘﺒﺎﻝ ﺍﻟﺮﻗﻤﻰ ﻭ ﻟﻜﻦ ﺍﻟﺬﻯ ﺗﻐﻴﺮ ﻣﻊ‬
‫ﺟﻴﺠﺎﻫﻴﺮﺗﺰ ﺑﺎﺳﺘﻘﻄﺎﺏ ﺃﻓﻘﻰ ﻭ ﻣﻌﺪﻝ ﺗﺮﻣﻴﺰ‬ ‫ﻣﺼﻤﻢ ﻟﻠﺘﺮﻛﻴﺐ ﻋﻠﻰ ﺃﻃﺒﺎﻕ ﻏﻴﺮ ﻣﻀﺒﻮﻃﺔ‬ ‫ﻣﺮﻭﺭ ﺍﻟﻮﻗﺖ ﻫﻮ ﺃﺩﺍء ﻭﺣﺪﺓ ﺍﻝ ‪ LNB‬ﻧﻔﺴﻬﺎ‬
‫00572 ﻣﻴﺠﺎﺳﻴﻤﺒﻮﻝ / ﺛﺎﻧﻴﺔ .‬ ‫ﺍﻟﺒﺆﺭﺓ ، ﻭ ﺣﻴﺚ ﺃﻥ ﻫﺬﻩ ﺍﻟﻮﺣﺪﺍﺕ ﺗﺴﻤﻰ ﺍﻟﻮﺣﺪﺍﺕ‬ ‫ﻓﻜﺎﻧﺖ ﻣﻨﺬ ﺳﻨﻮﺍﺕ ﻋﺪﻳﺪﺓ ﻣﺎﺿﻴﺔ ﺗﻌﻤﻞ ﻋﻠﻰ ﻗﺪﺭﺓ‬
‫‪TECHNICAL‬‬
‫‪DATA‬‬ ‫ﺗﻌﻠﻴﻖ ﺍﻟﺨﺒﺮﺍء‬
‫‪Manufacturer‬‬ ‫,‪Max Communication GmbH‬‬ ‫ﺍﻹﻳﺠﺎﺑﻴﺎﺕ‬
‫,‪Siemensstr. 53, 25462 Rellingen, Germany‬‬ ‫ﺟﻤﻴﻊ ﺍﻟﻤﻮﺩﻳﻼﺕ ﺍﻷﺭﺑﻌﺔ ﻗﺪ ﺃﻋﻄﺖ ﺃﺩﺍء ﻛﺒﻴﺮ ﻓﻰ ﺧﻔﺾ ﻣﺴﺘﻮﻯ‬
‫/‪http://www.maxcommunication.de‬‬
‫ﺍﻟﻀﻮﺿﺎء ﻛﻤﺎ ﻭﻋﺪﺕ ﺍﻟﺸﺮﻛﺔ ﺍﻟﻤﻨﺘﺠﺔ ﻭ ﻟﻢ ﻳﻜﻦ ﻫﻨﺎﻙ ﺗﻔﺎﻭﺕ ﻓﻰ‬
‫‪E-mail‬‬ ‫‪info@max-communication.de‬‬ ‫ﺍﻟﻘﺪﺭﺓ ﻓﻰ ﺃﻯ ﻣﻦ ﺍﻟﻤﺨﺎﺭﺝ ﺍﻟﺜﻨﺎﺋﻴﺔ ﺃﻭ ﺍﻟﺮﺑﺎﻋﻴﺔ ﻋﻦ ﺑﻌﻀﻬﺎ ، ﺇﺫﺍ ﻛﻨﺖ‬
‫‪Phone‬‬ ‫0-0606 / 1014 94+‬ ‫ﺗﺴﺘﺨﺪﻡ ﻭﺣﺪﺍﺕ ﺑﻤﻘﺪﺍﺭ ﺧﻔﺾ ﺷﻮﺷﺮﺓ 8ﺭ0 ﺩﻳﺴﻴﺒﻞ ﻓﻘﻢ ﺑﺘﻐﻴﻴﺮﻫﺎ‬
‫‪Peter Miller‬‬
‫‪Fax‬‬ ‫99 9-0606 / 1014 94+‬
‫ﺑﻮﺣﺪﺍﺕ ﺟﺪﻳﺪﺓ ﻣﻦ ﺷﺮﻛﺔ ‪ Max Communication‬ﻭﺳﻮﻑ‬ ‫‪TELE-satellite‬‬
‫ﺗﺤﺼﻞ ﻋﻠﻰ ﺍﺳﺘﻘﺒﺎﻝ ﺟﻴﺪ ﻟﻺﺷﺎﺭﺍﺕ ﺍﻟﻀﻌﻴﻔﺔ .‬ ‫‪Test Center‬‬
‫‪Poland‬‬
‫‪Models‬‬ ‫,)‪801 (single), 802 (twin‬‬
‫)‪804 (quad) and 804-s (quatro‬‬
‫ﺍﻟﺴﻠﺒﻴﺎﺕ‬
‫‪Description‬‬ ‫‪Universal LNBF’s for Offset Dishes‬‬ ‫ﻻ ﺗﻮﺟﺪ ﺑﻴﺎﻧﺎﺕ ﻓﻨﻴﺔ ﺗﻔﺼﻴﻠﻴﺔ ﻣﺮﻓﻘﺔ ﻣﻊ ﺍﻟﻮﺣﺪﺍﺕ ﻣﺜﻞ ﺛﺒﺎﺕ ﺍﻟﻤﺬﺑﺬﺏ ﺍﻟﻤﺤﻠﻰ ﺃﻭ‬
‫‪Noise Figure‬‬ ‫.‪0.3 dB typ‬‬ ‫ﺩﺭﺟﺔ ﺍﻟﺤﺮﺍﺭﺓ ﺍﻟﺘﺸﻐﻴﻠﻴﺔ ، ﺍﻟﺘﺼﻨﻴﻊ ﺍﻟﺨﺎﺭﺟﻰ ﺍﻟﻌﺎﻡ ﻟﻠﻮﺣﺪﺍﺕ ﻻ ﻳﻌﻄﻰ ﺍﻧﻄﺒﺎﻋﺎ ﺟﻴﺪﺍ‬
‫‪LOF’s‬‬ ‫‪9.750 and 10.600 GHz‬‬ ‫ﻟﻤﻘﺎﻭﻣﺔ ﺗﻠﻚ ﺍﻟﻮﺣﺪﺍﺕ ﻟﻸﺣﻮﺍﻝ ﺍﻟﺠﻮﻳﺔ ﺍﻟﻘﺎﺳﻴﺔ .‬
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