对要发送的序列进行上变频，上变频到21MHz后进行发送。-change the frequence uop to the one that suit for transmission,which here is 21MHz.

用于SDR研究的100M上变频的设计电路及相关资料。Upconverter-100MHz-ADE_Design_Files_Rev2012-09-02-All design files associated with this Upconverter project are hereby deeded into the Public Domain by Opendous Inc.