Press Scroll Control knob then Func then Scroll Control knob. Press Scroll Control knob to exit. Set the Digital Threshold mode to Manual in Site Options or System Options for a Conventional channel. Press Func then Dept to hold on a Site or Channel to hold on a digital Channel. The first line on the display now shows the digital error rate and the decode threshold setting (0-20). The second line on the display shows the decode threshold levels for the site. Allow the scanner to monitor the site or channel for several minutes. The error rate should drop for each transmission and the threshold levels should automatically adjust to a more optimal setting. Then, once the threshold level settles to a stable setting, make a note of the value. This is the site's or channel's optimum decode threshold. Press Func and rotate the Scroll Control to set the MAN decode threshold start level to a setting that most closely matches the system's optimum decode threshold. Whatever you set at this point will be remembered for this site as the starting point for the auto-tuning function for subsequent transmission on site. See also Digital Threshold Level.

进入数字调整模式：按滚轮 → Func → 再按滚轮（再按滚轮退出）。前提：先把系统/站点选项中的 Digital Threshold Mode 设为 Manual，然后 Func + Dept 保持站点或 Channel 保持数字频道。屏幕上第一行显示数字误码率与当前解码阈值（0–20）；第二行显示该站点的阈值电平。操作建议：让扫描机监听数分钟——误码率应逐次通话下降，阈值自动趋优；待阈值稳定后记下数值，即为该站点/频道的最佳解码阈值。再按 Func 并转动滚轮，把 MAN 起始阈值设为最接近该值；此值会被记住，作为该站点后续自动调谐的起点。

You can find the physical location of antennas using the databases available at Radio Reference or the FCCs Antenna Structure Registration site. Both sites list the latitude, longitude, and height of the antenna and both sites can map the exact location for you. Once the scanner completes the initial GPS review, if you move into or out of an area covered by a Site/Department, the scanner will Avoid and Unavoid Sites and Departments according to Range settings for the scanner and Sites/Departments. If you cycle power, all Sites/Departments are Unavoided until the scanner reacquires the GPS signal and completes the initial GPS review. Note: If you unplug your GPS device or it loses reception to satellites, the scanner will use the last known location as the current location.

天线地理坐标可从 RadioReference 数据库或 FCC 天线结构注册（ASR）网站查到（均提供经纬度、高度与地图定位）。扫描机完成初始 GPS 巡检后，随你移动将按范围设置自动回避/启用站点与部门。若关机重启，所有站点/部门会先全部解除回避，直到重新收到 GPS 信号并完成巡检。注意：拔掉 GPS 或卫星失锁时，扫描机沿用最后已知位置。