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faq:freedom-from-feedback [2015/04/21 16:26]
hess [Freedom from Feedback]
faq:freedom-from-feedback [2015/10/14 11:06]
fachet [GSM-R]
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 As a theoretical rule of thumb, a good decoupling requires a distance of 5 to 10 λ.(([λ] Lambda = Wave length = v/f with v∼3×10<​sup>​8</​sup>​ m/s.))\\ As a theoretical rule of thumb, a good decoupling requires a distance of 5 to 10 λ.(([λ] Lambda = Wave length = v/f with v∼3×10<​sup>​8</​sup>​ m/s.))\\
 However, in practive often a distance of 3 λ is sufficient. \\ However, in practive often a distance of 3 λ is sufficient. \\
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 At 2.1 GHz (e.g. UMTS) the formula returns 300'​000'​000/​2'​100'​000'​000 = 300/2100 = 0.14m. At 2.1 GHz (e.g. UMTS) the formula returns 300'​000'​000/​2'​100'​000'​000 = 300/2100 = 0.14m.
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 For GSM-R Deutsche Bahn requires a decoupling of up to -60 dBm. According to a simulation of one of our antenna supplier a distance of 350 cm is sufficant to fulfill this requirements For GSM-R Deutsche Bahn requires a decoupling of up to -60 dBm. According to a simulation of one of our antenna supplier a distance of 350 cm is sufficant to fulfill this requirements
  
-Source: {{:faq:entkopplung_gsm-r_-_v02.pdf|}}+Source: ​{{{{:faq:simulation_report_decoupling_gsm-r_v06.pdf|}} 
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 +Quelle: {{:​faq:​simulation_report_entkopplung_gsm-r_v06.pdf|}}