Design and Implementation of VHF Hopping Radio Transmission Module
Qun Hou · Communications technology · 2011
In frequency hopping communication,a stationary intermediate-frequency signal could be achieved after frequency mixing when the received frequency hopping carrier sequence is the same with the local frequency hopping pattern,and then it could be received after demodulation.Several frequencies transmit several signals by two-way mode in turn,and each signal uses this frequency by time-sharing mode in turn,thus the effect of anti-noise and usage of spectrum could be improved.A VHF hopping radio is described in this paper.The composition and principle of transmission module are discussed in detail.This module could produce a precise modulated intermediate-frequency signal locked on the main reference frequency 14.5 MHz.