The author's solution to this problem is to use a tuneable RF preamplifier which also acts as a low pass filter when tuning the low end of the 88-108 MHz band where most of the exotic channels lie.
RF sensitivity tuning, EMI design and improvement for new developed product.
（射频）敏感性定调，EMI设计和改善为新被开发的产品。
3
The RF direct sampling scheme is used in HLS digital TBF system, and simplifies the electronics circuits and saves the cost for tuning and maintaining.