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This article provides an overview of Performance Analysis of Round Trip Time (RTT) in Narrowband RF Networks for remote wireless communications using narrow band radios modem &Routers ((RipEX unit) ,as a means of transmission to communicate between the loins broadcast sites TV/FM. RTT delay measurement is influenced by different parameters of Narrowband RF Networks. We illustrate, in this paper, how RTT varies (in remote wireless practical communications application) versus distance, modulation, baud rates, number of hops and throughput, between source and destination. Also, we will see how the Forward Error Correction (FEC) affect, in the same time, the RTT according the factors cited above.