求翻译：4. 错频技术：同类检测系统中的两套检测天线直线距离≥15米的情况下不需要同步，减少了同步线的费用，为工程实施和安装使用带来方便。是什么意思？

4. Wrong frequency technology: two sets of similar detection system detects the antenna straight-line distance ≥ 15 m in case of no synchronization, reducing the cost of synchronization line for project implementation and installation convenience.

4 * wrong frequency technologies: similar detection system detects antenna in two sets of straight-line distance of ≥ 15 meters need not be synchronous, and reduce the cost of synchronous line for implementation of the project and install using convenience.

4. Wrong frequency technology: In the similar examination system two set of examination antenna straight distance ≥15 rice situation does not need the synchronization, reduced the synchronized line expense, implements for the project and installs the use to bring conveniently.

4. the wrong frequency: two sets of test antenna detection system of its kind case of linear distance ≥ 15 m no synchronization is required, reduce the cost of the synchronous lines, for the implementation of the project and installation convenience.

4. the wrong frequency: two sets of test antenna detection system of its kind case of linear distance ≥ 15 m no synchronization is required, reduce the cost of the synchronous lines, for the implementation of the project and installation convenience.