Mohafezat Az Antenhaie Com

‫ﻣﺤﺎ ﻓﻈﺖ ﺁﻧﺘﻦ ﻫﺎﻱ ﻣﺎﻫﻮﺍﺭﻩ ﺍﻱ ﺍﺯ ﺍﺧﺘﻼ ﻻ ﺗﻲ ﻛﻪ ﺍﻣﻮﺍﺝ‬ ‫ﺭﺍﺩﻳﻮﻳﻲ ﻣﺰﺍﺣﻢ )ﭘﺎﺭﺍﺯﻳﺖ ﻫﺎ( ﭘﺪﻳﺪ ﻣﻲ ﺁﻭﺭﻧﺪ‬

‫ﻏﺎﻟﺒﺎ ﺁﻧﺘﻦ ﻫﺎﻱ ﻛﻮﭼﻚ ﻣﻮﺟﻮﺩ ﺩﺭ ﺑﺎﺯﺍﺭ ﺑﺮﺍﯼ ﺩﺭﻳﺎﻓﺖ ﺳﻴﮕﻨﺎﻝ ﺑﺮﻧﺎﻣﻪ ﻫﺎﻱ ﻣﺎﻫﻮﺍﺭﻩ ﺍﻱ‪ ،‬ﺩﺭ ﺍﺛﺮ ﺗﺪﺍﺧﻞ ﺍﻣﻮﺍﺝ ﺭﺍﺩﻳﻮﻳﻲ ﻣﺰﺍﺣﻢ ﺯﻣﻴﻨﯽ‬ ‫‪ Terrestrial Interference‬ﻏﻴﺮﻗﺎﺑﻞ ﺍﺳﺘﻔﺎﺩﻩ ﻣﻲ ﺷﻮﻧﺪ‪ .‬ﺑﺎ ﺭﻭﺵ ﻫﺎﻱ ﺯﻳﺮ ﻣﻲ ﺗﻮﺍﻥ ﺑﺪﻭﻥ ﻧﻴﺎﺯ ﺑﻪ ﺩﺍﻧﺶ ﻓﻨﻲ‪ ،‬ﺗﺠﻬﻴﺰﺍﺕ ﻭ ﻭﺳﺎﻳﻞ‬ ‫ﺍﺿﺎﻓﻲ ﻭ ﺻﺮﻑ ﻫﺰﻳﻨﻪ ﺯﻳﺎﺩ‪ ،‬ﻣﺸﻜﻞ ﺭﺍ ﺑﺮﻃﺮﻑ ﺳﺎﺧﺖ‪ .‬ﺁﻧﺘﻦ ﻣﻮﺭﺩ ﻧﻈﺮ ﺩﺭ ﻣﺜﺎﻝ ﻣﺎ ﺩﺍﺭﺍﻱ ﻗﻄﺮ ﻳﻚ ﻣﺘﺮ ﻭ ﺯﺍﻭﻳﻪ‪ elevation‬ﺩﻩ ﺩﺭﺟﻪ‬ ‫ﺭﻭﻱ ﺍﻓﻖ ﺍﺳﺖ‪ .‬ﺑﺎﻳﺪ ﺗﻮﺟﻪ ﮐﺮﺩ ﮐﻪ ﺍﻳﻦ ﺗﮑﻨﻴﮑﻬﺎ‪ ،‬ﻫﻨﮕﺎﻣﯽ ﻣﻮﺛﺮ ﺍﺳﺖ ﮐﻪ ﺍﺧﺘﻼﻝ ﺩﺭ ﺍﻣﻮﺍﺝ ﻣﺎﻫﻮﺍﺭﻫﺎﯼ ﻣﺤﻠﯽ ﺑﺎﺷﺪ‪ ،‬ﻧﻪ ﻫﻨﮕﺎﻣﯽ ﮐﻪ‬ ‫ﺍﻣﻮﺍﺝ ﻣﺎﻫﻮﺍﺭﻩ ﻫﻨﮕﺎﻡ ‪ uplink‬ﻳﺎ ﺍﺯ ﻣﺒﺪﺍﹰ‪ ،‬ﻫﺪﻑ ﺍﺧﺘﻼﻝ ﻗﺮﺍﺭ ﮔﻴﺮﻧﺪ‪.‬‬ ‫ﺭﻭﺵ ﻫﺎﻱ ﻣﻘﺎﺑﻠﻪ ﺑﺎ ﺗﺪﺍﺧﻞ ﺍﻣﻮﺍﺝ ﺭﺍﺩﻳﻮﻳﻲ ﻣﺰﺍﺣﻢ‪:‬‬ ‫ﻳﮏ‪ :‬ﺍﻧﺘﺨﺎﺏ ﺟﺎﻱ ﻣﻨﺎﺳﺐ ﺑﺮﺍﻱ ﺁﻧﺘﻦ‬ ‫ﺍﮔﺮ ﺟﻬﺖ ﺍﻣﻮﺍﺝ ﺭﺍﺩﻳﻮﻳﻲ ﻣﺰﺍﺣﻢ ﻗﺎﺑﻞ ﺗﺸﺨﻴﺺ ﺍﺳﺖ‪ ،‬ﺳﻴﮕﻨﺎﻝ ﻻﺯﻡ ﺭﺍ ﻣﻲ ﺗﻮﺍﻥ ﺑﺎ ﺟﺎﺑﺠﺎ ﻛﺮﺩﻥ ﺁﻧﺘﻦ ﻭﻗﺮﺍﺭ ﺩﺍﺩﻥ ﺁﻥ ﺩﺭ ﭘﻨﺎﻩ ﻣﻮﺍﻧﻌﻲ‬ ‫ﻣﺎﻧﻨﺪ ﺩﻳﻮﺍﺭ‪ ،‬ﺑﻨﺎﻱ ﺑﻠﻨﺪ ﻳﺎ ﻧﺮﺩﻩ ﺩﺭﻳﺎﻓﺖ ﻛﺮﺩ‪ .‬ﺍﻳﻦ ﻣﻮﺍﻧﻊ ﺑﺎﻳﺪ ﺑﻴﻦ ﺁﻧﺘﻦ ﻭ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻗﺮﺍﺭ ﮔﻴﺮﻧﺪ‪ .‬ﺍﺯ ﺁﻧﺠﺎ ﻛﻪ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﺍﺯ ﻃﺮﻳﻖ‬ ‫ﺍﻧﻌﻜﺎﺱ ﺭﻭﻱ ﺳﻄﻮﺣﻲ ﻧﺰﺩﻳﻚ ﺁﻧﺘﻦ ﻫﻢ‪ ،‬ﺩﺭ ﺁﻥ ﺭﺳﻮﺥ ﻣﻲ ﻛﻨﻨﺪ‪ ،‬ﺍﻳﺠﺎﺩ ﻣﺎﻧﻊ ﺑﻴﻦ ﺁﻧﺘﻦ ﻭ ﻣﻨﺒﻊ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻫﻤﻴﺸﻪ ﻣﻮﺛﺮ ﻧﻴﺴﺖ‪.‬‬ ‫ﺑﻬﺘﺮﻳﻦ ﺣﺎﻟﺖ ﺯﻣﺎﻧﻲ ﺍﺳﺖ ﻛﻪ ﺁﻧﺘﻦ ﺩﺭ ﺗﻤﺎﻡ ﺟﻬﺎﺕ ﻛﺎﻣﻼ ﭘﻮﺷﻴﺪﻩ ﺑﺎﺷﺪ‪ ،‬ﺑﺠﺰ ﻳﮏ ﮔﺸﺎﺩﮔﻲ ﺩﺭ ﺟﻬﺖ ﻣﺎﻫﻮﺍﺭﻩ ﻭ ﺑﺎ ﻗﻮﺳﻲ ﻣﻌﺎﺩﻝ‬ ‫ﺑﻌﻼﻭﻩ ﻳﺎ ﻣﻨﻬﺎﻱ ﭘﻨﺞ ﺩﺭﺟﻪ ﭘﻬﻨﺎﻱ ﺑﺎﻧﺪ ﺁﻧﺘﻦ‪ .‬ﺩﺭ ﻣﻮﺭﺩ ﺁﻧﺘﻦ ﻣﻮﺭﺩ ﻣﺜﺎﻝ ﻣﺎ ﺍﻳﻦ ﻗﻮﺱ ‪ ۱۲‬ﺩﺭﺟﻪ ﺧﻮﺍﻫﺪ ﺑﻮﺩ‪.‬‬ ‫ﺑﺮﺍﻱ ﻳﻚ ﺁﻧﺘﻦ ﻛﻮﭼﻚ ﭼﻨﻴﻦ ﭘﻮﺷﺸﻲ ﻣﻴﺘﻮﺍﻧﺪ ﻳﻚ ﺳﺎﺧﺘﻤﺎﻥ‪ ،‬ﻳﻚ ﮔﻮﺩﻱ ﺑﺰﺭﮒ ﺩﺭ ﺯﻣﻴﻦ )ﻣﺜﻼ ﻳﻚ ﺍﺳﺘﺨﺮ ﻳﺎ ﺣﻮﺽ ﻏﻴﺮﻗﺎﺑﻞ‬ ‫ﺍﺳﺘﻔﺎﺩﻩ( ﻳﺎ ﺷﺒﻴﻪ ﺁﻧﻬﺎ ﺑﺎﺷﺪ‪ .‬ﺍﮔﺮ ﺑﻴﺶ ﺍﺯ ﻳﻚ ﻣﺎﻧﻊ ﺩﺭ ﺁﻥ ﺍﻃﺮﺍﻑ ﻣﺸﺎﻫﺪﻩ ﻣﻲ ﻛﻨﻴﺪ ﺑﻬﺘﺮ ﺍﺳﺖ ﺁﻧﺘﻦ ﺭﺍ ﻧﺰﺩﻳﻚ ﺑﻠﻨﺪﺗﺮﻳﻦ ﻣﺎﻧﻊ ﻗﺮﺍﺭ‬ ‫ﺩﻫﻴﺪ‪.‬‬ ‫ﺷﻜﻞ )‪ (A‬ﻣﻮﺭﺩﻱ ﺭﺍ ﻧﺸﺎﻥ ﻣﻲ ﺩﻫﺪ ﻛﻪ ﺁﻧﺘﻦ ﺑﻴﻦ ﺩﻭ ﺳﺎﺧﺘﻤﺎﻥ ﻧﺼﺐ ﺷﺪﻩ ﺍﺳﺖ‪ .‬ﺗﻮﺟﻪ ﻛﻨﻴﺪ ﮐﻪ ﺁﻧﺘﻦ ﻭﺍﻗﻊ ﺩﺭ ﺳﻤﺖ ﺭﺍﺳﺖ ﻣﻤﻜﻦ‬ ‫ﺍﺳﺖ ﺩﺭ ﻣﻌﺮﺽ ﺗﺪﺍﺧﻞ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻧﺎﺷﻲ ﺍﺯ ﺍﻧﻌﻜﺎﺱ ﺁﻧﻬﺎ ﺭﻭﻱ ﺳﺎﺧﺘﻤﺎﻥ ﺳﻤﺖ ﭼﭗ ﻗﺮﺍﺭ ﮔﻴﺮﺩ‪ .‬ﻣﻨﺎﺳﺐ ﺗﺮﻳﻦ ﺟﺎ ﺑﺮﺍﻱ ﺁﻧﺘﻦ‪،‬‬ ‫ﻧﺰﺩﻳﻚ ﺳﺎﺧﺘﻤﺎﻥ ﺑﻠﻨﺪ ﺍﺳﺖ ﺯﻳﺮﺍ ﻣﺤﻔﻮﻅ ﺗﺮﻳﻦ ﺟﺎﻱ ﻣﻤﻜﻦ ﺍﺳﺖ‪.‬‬

‫ﺩﻭ‪ :‬ﭘﻮﺷﺶ ﺑﺎ ﺗﻮﺭ ﻓﻠﺰﯼ‬ ‫ﺍﮔﺮ ﺩﺭ ﺍﻃﺮﺍﻑ ﺁﻧﺘﻦ ﻣﻮﺍﻧﻊ ﻃﺒﻴﻌﻲ ﻭﺟﻮﺩ ﻧﺪﺍﺭﺩ‪ ،‬ﻣﻲ ﺗﻮﺍﻥ ﺍﺯ ﺷﺒﻜﻪ ﻫﺎﻱ ﺗﻮﺭﻱ ﻓﻠﺰﻱ ﺑﺮﺍﻱ ﺍﻳﺠﺎﺩ ﺣﻔﺎﻅ ﺩﺭ ﺑﺮﺍﺑﺮ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻭ ﺗﺎﺑﺶ‬ ‫ﻫﺎﻱ ﺁﻥ ﺍﺳﺘﻔﺎﺩﻩ ﻛﺮﺩ‪ .‬ﺍﻳﻦ ﺷﺒﻜﻪ ﻫﺎ ﺑﺎﻳﺪ ﺍﺯ ﺗﻮﺭﻱ ﻫﺎﻱ ﺁﻟﻮﻣﻴﻨﻴﻮﻣﻲ ﻳﺎ ﻓﻮﻻﺩﻱ ﺳﺎﺧﺘﻪ ﺷﻮﻧﺪ‪ .‬ﺗﻮﺭ ﻣﺴﻲ ﻋﻠﻴﺮﻏﻢ ﻛﻴﻔﻴﺖ ﺑﻬﺘﺮ‪ ،‬ﮔﺮﺍﻥ ﻭ‬ ‫ﻛﻤﺘﺮ ﻗﺎﺑﻞ ﺩﺳﺘﺮﺱ ﺍﺳﺖ‪ .‬ﻓﺎﺻﻠﻪ ﺑﻴﻦ ﺳﻴﻢ ﻫﺎﻱ ﺷﺒﻜﻪ ﻧﺒﺎﻳﺪ ﺑﻴﺸﺘﺮ ﺍﺯ ﻧﻴﻢ ﺳﺎﻧﺘﻴﻤﺘﺮ ﺑﺎﺷﺪ‪ .‬ﺷﺒﻜﻪ ﻫﺎﻱ ﺗﻮﺭﻱ ﻣﻌﻤﻮﻟﯽ ﮐﻪ ﺑﺮﺍﯼ‬ ‫ﺟﻠﻮﮔﻴﺮﯼ ﺍﺯ ﻭﺭﻭﺩ ﺣﺸﺮﺍﺕ ﺟﻠﻮﯼ ﭘﻨﺠﺮﻩ ﮔﺬﺍﺷﺘﻪ ﻣﯽ ﺷﻮﺩ‪ ،‬ﺑﺎ ﺣﻔﺮﻫﻬﺎﺋﯽ ﺣﺪﻭﺩ ﻳﻚ ﺩﻫﻢ ﺳﺎﻧﺘﻴﻤﺘﺮ ﺑﻬﺘﺮﻳﻦ ﺍﺳﺖ‪ .‬ﺷﺒﻜﻪ ﺗﻮﺭﯼ ﻓﻠﺰﯼ‬ ‫ﻣﺤﺎﻓﻆ ﺑﺎﻳﺪ ﻛﺎﻣﻼ ﺩﻭﺭﺗﺎﺩﻭﺭ ﺁﻧﺘﻦ ﺭﺍ ﺑﮕﻴﺮﺩ ﻭ ﻳﻚ ﻣﺘﺮ ﺍﺯ ﺁﻧﺘﻦ ﺑﻠﻨﺪﺗﺮ ﺑﺎﺷﺪ‪ .‬ﺷﺒﻜﻪ ﻫﺎ ﻧﺒﺎﻳﺪ ﻋﻤﻮﺩﻱ ﺑﺎﺷﻨﺪ ﺑﻠﻜﻪ ﺑﺎﻳﺪ ﺑﺎ ﺷﻴﺐ ‪ ۳۰‬ﺗﺎ ‪۴۵‬‬ ‫ﺩﺭﺟﻪ ﺩﺭ ﺍﻃﺮﺍﻑ ﺁﻧﺘﻦ ﻗﺮﺍﺭ ﮔﻴﺮﻧﺪ‪ .‬ﭘﺎﻳﻪ ﺷﺒﮑﻪ ﺗﻮﺭﻱ ﺑﺎﻳﺪ ﺗﻘﺮﻳﺒـ ﹰﺎ ﻳﮏ ﻣﺘﺮ ﺑﺎ ﭘﺎﻳﻪ ﺁﻧﺘﻦ ﻓﺎﺻﻠﻪ ﺩﺍﺷﺘﻪ ﺑﺎﺷﺪ‪ .‬ﺩﺭ ﺻﻮﺭﺕ ﺑﻪ ﻛﺎﺭ ﮔﺮﻓﺘﻦ‬ ‫ﺷﺒﻜﻪ ﺗﻮﺭﻱ‪ ،‬ﺯﺍﻭﻳﻪ ﻣﻴﺎﻥ ﭘﺎﻳﻴﻦ ﺗﺮﻳﻦ ﻧﻘﻄﻪ ﺭﻓﻠﻜﺘﻮﺭ ﺁﻧﺘﻦ ﻭ ﺑﻠﻨﺪﺗﺮﻳﻦ ﻧﻘﻄﻪ ﺷﺒﻜﻪ ﺗﻮﺭﻱ ﺑﺎﻳﺪ ﺗﻘﺮﻳﺒﺎ ‪ ۵‬ﺩﺭﺟﻪ ﻛﻤﺘﺮ ﺍﺯ ﺯﺍﻭﻳﻪ ﻣﺎﻫﻮﺍﺭﻩ ﺑﺎ‬ ‫ﺍﻓﻖ ﺑﺎﺷﺪ‪ .‬ﻣﺜﻼ‪ ،‬ﺍﮔﺮ ﺯﺍﻭﻳﻪ ﻣﺎﻫﻮﺍﺭﻩ ‪ ۱۰‬ﺩﺭﺟﻪ ﺍﺳﺖ‪ ،‬ﺯﺍﻭﻳﻪ ﻣﻴﺎﻥ ﭘﺎﻳﻴﻦ ﺁﻧﺘﻦ ﺗﺎ ﺑﺎﻻﻱ ﺷﺒﻜﻪ ﺗﻮﺭﻱ ﻧﺒﺎﻳﺪ ﺑﻴﺶ ﺍﺯ ‪ ۵‬ﺩﺭﺟﻪ ﺑﺎﺷﺪ‪ .‬ﺩﺭ ﺍﻳﻦ‬ ‫ﻣﺜﺎﻝ ﻓﺎﺻﻠﻪ ﻣﻴﺎﻥ ﭘﺎﻳﻴﻦ ﺷﺒﻜﻪ ﺗﺎ ﺁﻧﺘﻦ ﺑﺎﻳﺪ ‪ ۲‬ﻣﺘﺮ ﺑﺎﺷﺪ‪ .‬ﺷﺒﻜﻪ ﺗﻮﺭﻱ ﺑﺎﻳﺪ ﺑﺎ ﺳﻴﻢ ﻛﺸﻲ ﺑﺮﻕ ﺑﻪ ﺳﻴﻢ ﺯﻣﻴﻦ ﻣﺮﺗﺒﻂ ﺷﻮﺩ‪.‬‬ ‫ﺷﻜﻞ )‪ (B‬ﻳﻚ ﺁﻧﺘﻦ ﺑﺎ ﭘﻮﺷﺶ ﺷﺒﻜﻪ ﻓﻠﺰﻱ ﺭﺍ ﻧﺸﺎﻥ ﻣﻲ ﺩﻫﺪ‪ .‬ﺍﻳﻦ ﺷﺒﮑﻪ ﻫﺎ ﺍﺯ ﭼﺎﺭﭼﻮﺑﯽ ﻓﻠﺰﯼ ﻳﺎ ﭼﻮﺑﯽ ﺳﺎﺧﺘﻪ ﺍﻧﺪ ﮐﻪ ﺗﻮﺭ ﺳﻴﻤﯽ ﺑﻪ‬ ‫ﺁﻥ ﻣﻴﺦ ﺷﺪﻩ ﺍﺳﺖ‪.‬‬

‫ﺳﻪ‪ :‬ﺗﻨﻈﻴﻢ ﺁﻧﺘﻦ‬ ‫ﺗﻨﻈﻴﻤﯽ ﮐﻪ ﺑﺮﺍﯼ ﺟﻬﺖ ﺁﻧﺘﻦ ﺩﺭﻧﺒﻮﺩ ﻣﺰﺍﺣﻢ ﺍﻧﺠﺎﻡ ﻣﯽ ﺷﻮﺩ‪ ،‬ﻣﻤﻜﻦ ﺍﺳﺖ ﭘﺲ ﺍﺯ ﭘﺪﻳﺪ ﺁﻣﺪﻥ ﺍﻣﻮﺍﺝ ﺭﺍﺩﻳﻮﻳﯽ ﻣﺰﺍﺣﻢ ﺑﻬﻢ ﺑﺨﻮﺭﺩ ﺯﻳﺮﺍ‬ ‫ﺍﻳﻨﮕﻮﻧﻪ ﺍﻣﻮﺍﺝ ﺭﺍﺩﻳﻮﻳﯽ ﺍﻳﺠﺎﺩ ﮐﻨﻨﺪﻩ ﺍﺧﺘﻼﻝ‪ ،‬ﺍﺣﺘﻤﺎﻻ ً ﺍﺯﺟﻬﺘﯽ ﻭﺍﺭﺩ ﻣﻴﺸﻮﻧﺪ ﮐﻪ ﺁﻧﺘﻦ ﺩﺍﺭﺍﯼ ﻗﺪﺭﺕ ﺩﺭﻳﺎﻓﺖ ﺑﻴﺸﺘﺮﯼ ﺍﺳﺖ‪ .‬ﺩﺭ ﺍﻳﻨﮕﻮﻧﻪ‬ ‫ﻣﻮﺍﺭﺩ ﻳﻚ ﺗﻐﻴﻴﺮ ﺟﺰﻳﻲ ﺟﻬﺖ ﺁﻧﺘﻦ ﻣﻴﺘﻮﺍﻧﺪ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﺭﺍ ﺑﻲ ﺍﺛﺮ ﮐﻨﺪ‪ ،‬ﺑﺪﻭﻥ ﺁﻧﮑﻪ ﺗﺎﺛﻴﺮ ﻧﺎﻣﻄﻠﻮﺏ ﭼﻨﺪﺍﻧﻲ ﺩﺭ ﻛﻴﻔﻴﺖ ﺳﻴﮕﻨﺎﻝ ﻫﺎﻱ‬ ‫ﻣﺎﻫﻮﺍﺭﻩ ﻣﻮﺭﺩ ﻧﻈﺮ ﺑﮕﺬﺍﺭﺩ‪ .‬ﺍﻳﻦ ﺗﻨﻈﻴﻢ ﻫﺎ ﻏﺎﻟﺒﺎ ﺑﻪ ﻛﻤﻚ ﺳﻤﺖ ‪ Azimuth‬ﻭ ﺯﺍﻭﻳﻪ ‪ Elevation‬ﻗﺎﺑﻞ ﺩﺳﺘﺮﺳﻲ ﺍﺳﺖ‪.‬‬

‫ﭼﻬﺎﺭ‪ :‬ﺗﻠﻔﻴﻖ ﺗﻜﻨﻴﻚ ﻫﺎﻱ ﻣﺨﺘﻠﻒ‬ ‫ﺩﺭ ﺍﻏﻠﺐ ﻣﻮﺍﺭﺩ‪ ،‬ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﻣﺠﻤﻮﻋﻪ ﺗﻜﻨﻴﻚ ﻫﺎﻱ ﻣﺨﺘﻠﻒ‪ ،‬ﺑﺮﺍﻱ ﺍﺯ ﺑﻴﻦ ﺑﺮﺩﻥ ﺗﺪﺍﺧﻞ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻻﺯﻡ ﺍﺳﺖ‪ .‬ﺑﻌﻨﻮﺍﻥ ﻣﺜﺎﻝ ﺍﮔﺮ‬ ‫ﺳﺎﺧﺘﻤﺎﻥ ﻣﻨﺎﺳﺒﻲ ﺑﺮﺍﻱ ﮔﺬﺍﺷﺘﻦ ﺁﻧﺘﻦ ﺩﺭ ﺩﺍﺧﻞ ﺁﻥ ﻣﻮﺟﻮﺩ ﺑﺎﺷﺪ ﻣﻲ ﺗﻮﺍﻥ ﺑﺎ ﺗﻌﺒﻴﻪ ﺷﺒﻜﻪ ﺗﻮﺭﻱ ﻫﺎﻱ ﻓﻠﺰﻱ ﺩﺭ ﺩﻳﻮﺍﺭﻫﺎ ﺑﻪ ﭘﺴﺰﻧﻲ‬ ‫ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻛﻤﻚ ﻛﺮﺩ‪ .‬ﺩﺭ ﻣﻮﺍﺭﺩﻱ ﻛﻪ ﮔﻮﺩﻱ ﻣﻨﺎﺳﺒﻲ ﺑﺮﺍﻱ ﺁﻧﺘﻦ ﻭﺟﻮﺩ ﺩﺍﺭﺩ‪ ،‬ﺗﻮﺭﻱ ﻫﺎ ﻣﻲ ﺗﻮﺍﻧﻨﺪ ﻛﺎﺭ ﻣﺤﺎﻓﻈﺖ ﺭﺍ ﻋﻤﻴﻖ ﺗﺮ ﻛﻨﻨﺪ‪.‬‬ ‫ﺩﺭ ﺷﻜﻞ )‪ (C‬ﺗﻮﺭﻱ ﻫﺎﻱ ﻓﻠﺰﻱ ﺩﻭﺭ ﺗﺎ ﺩﻭﺭ ﻣﺤﻞ ﻧﺼﺐ ﺁﻧﺘﻦ ﻗﺮﺍﺭ ﮔﺮﻓﺘﻪ ﺍﻧﺪ ﻭ ﺳﺒﺐ ﺗﻘﻮﻳﺖ ﻗﺪﺭﺕ ﻣﺤﺎﻓﻈﺖ ﺍﺯ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﻣﻲ ﺷﻮﻧﺪ‬ ‫ﺍﻣﺎ ﻓﺮﺍﻣﻮﺵ ﻧﻜﻨﻴﺪ ﻛﻪ ﺩﺭ ﺍﻳﻦ ﻣﻮﺭﺩ ﺑﺎﻳﺪ ﻳﻚ ﮔﺸﺎﺩﮔﻲ ﺩﺭ ﺟﻬﺖ ﻣﺎﻫﻮﺍﺭﻩ ﻣﻮﺭﺩ ﻧﻈﺮ ﺍﻳﺠﺎﺩ ﻛﻨﻴﺪ ﺗﺎ ﺑﺘﻮﺍﻧﻴﺪ ﺳﻴﮕﻨﺎﻝ ﻫﺎﻱ ﻣﻄﻠﻮﺏ ﺭﺍ ﺑﻪ‬ ‫ﺭﻭﺷﻨﻲ ﺩﺭﻳﺎﻓﺖ ﺩﺍﺭﻳﺪ‪.‬‬

‫ﻣﻄﺎﻟﺐ ﺑﺎﻻ ﺑﺮﮔﺮﻓﺘﻪ ﺍﺯ ﻣﻘﺎﻟﻪ ﺍﻱ ﺑﻮﺩ ﮐﻪ ﺩﺭ ﺳﺎﻳﺖ ﺭﺍﺩﻳﻮ ﻓﺮﺩﺍ ﺑﺮﺍﻱ ﻣﻘﺎﺑﻠﻪ ﺑﺎ ﺍﻣﻮﺍﺝ ﻣﺰﺍﺣﻢ ﭘﺎﺭﺍﺯﻳﺖ ﮔﻨﺠﺎﻧﺪﻩ ﺷﺪﻩ ﺑﻮﺩ‬

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