Help: Yaesu 500D frequently changes frequencies on its own.

BA4RAC

八重洲FTM500DR 经常自己跳频率，A频段和B频段都有这个情况，频率模式下比如当前在438.500MHz下，会自己随机跳频率。信道模式下比如当前在信道1，会随机跳到信道5，信道6，信道3。随机性很强，出现概率不一定，有遇到过此问题的ham吗？

（附件好像不支持挂视频？）

BG5BVC

BA4RAC 我的是在信道模式和频率模式间反复跳跃。后面还寄回去返修，结果什么问题也没查出来，说可能是机头的连接线接触不好，换了一根，问题解决了。

BA4RAC

Additionally, sometimes it automatically adjusts the step frequency. When the step frequency is set to 5 kHz in the settings, it may automatically change to 12.5 kHz after frequency hopping.

BG9EQM

The encoder isn't working properly?

BA4RAC

BG9EQM I don't know, sometimes it also fluctuates in volume; a perfectly good volume suddenly jumps to maximum, making the radio sound very loud and startling.

BA4RAC

BG5BVC I contacted the vendor, and they said it was a problem with the cable. They claimed that the cable was too long, so I replaced it with a 4-meter cable two days ago, and it hasn't caused any issues since then. However, further testing is still needed. This device seems to be causing some confusion.

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