某位先生暗示问题是蓝牙射频部分引起的，但是对此我极其怀疑。
One gentleman suggested the problem lies with the Bluetooth radio but I strongly doubt this is the case.
该收发信机采用超外差结构，主要包括中频部分的硬件设计以及射频部分的硬件设计。
The system adopts superheterodyne architecture. It consists of intermediate frequency (IF) band and radio frequency (RF) band hardware design.
另外，他还参与数字电缆和卫星电视接收机的射频部分研发并领导电缆电视上行信道工程。
In addition, he was also engaged in the RF front-end development of cable and satellite for digital TV and led the project return channel for cable.
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