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faq:freedom-from-feedback [2015/04/21 16:12] – hess | faq:freedom-from-feedback [2015/10/14 11:06] (current) – [GSM-R] fachet | ||
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====== Freedom from Feedback ====== | ====== Freedom from Feedback ====== | ||
- | As a rule of thumb, a good decoupling | + | As a theoretical |
- | In practive, in most cases a distance of 3 λ is sufficient. \\ | + | However, in practive often a distance of 3 λ is sufficient. \\ |
- | \\ | + | |
- | < | + | |
- | & | + | |
- | </ | + | |
+ | At 2.1 GHz (e.g. UMTS) the formula returns 300' | ||
- | For GSM-R Deutsche Bahn requires a decoupling of up to -60 dBm. According to a simulation of one of our antenna supplier a distanec of 350 cm is sufficant to fulfill this requirements | + | Three λ will then be 0.42m i.e. 42cm. |
- | Source: {{:faq:entkopplung_gsm-r_-_v02.pdf|}} | + | ===== GSM-R ===== |
+ | 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: | ||
+ | |||
+ | Quelle: {{: |