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http://www.ertms.net/
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< 10−2
< 10−2
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< 10−2
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< 10−4
𝑓𝐷𝑜𝑝𝑝𝑙𝑒𝑟 =𝑐. 𝑓
𝑐 + 𝑉
|∆𝑓| = |𝑓𝐷𝑜𝑝𝑝𝑙𝑒𝑟 − 𝑓| = |𝑐
𝑐 + 𝑉− 1| . 𝑓 ≤ 500𝐻𝑧
𝑉 ≤500. 𝑐
𝑓 − 500
→ ,
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𝐿𝑝 = 32.5 + 20 log(𝑓) + 20 log(𝐷)
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OTHER SIGNALLING SYSTEMS OVER TETRA: POSITIVE TRAIN CONTROL (PTC)
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