Similarly, user 171 is also experiencing this issue. I'll add my own observation: when using CW, if the transmission speed is too fast, it's likely to cause a "card" (QSL card) emission. Several people in our group have researched this and found that this device uses a very basic circuit-contact type of transmission, rather than the audio-simulated carrier wave method used by most modern radio stations. This can lead to the relay not being able to disconnect quickly enough when transmitting at high speed, resulting in a "card" emission. My own experiments show that if the speed exceeds 20, it will cause a "card" emission. This is not a very fast speed for CW, isn't it?😁
闽ICP备2021006864号-7
闽公网安备35020602002794号