If your DP-666 radio suddenly loses signal reception and has no radio audio, it may be that the antenna connector is damaged and needs to be repaired or replaced.
You can order adapter accessories from the link below, or you can try to repair the SMA connector yourself.
https://www.aliexpress.com/item/1005006588257759.html
You need to open the case and take out the old IPEX1 to SMA connector. The actual connector is shown in the figure below.
Then, use a flat-blade screwdriver to open the cover of the SMA connector and check whether the internal wire core is soldered properly.
The following figure shows a normal soldering of the wire core. The wire core of the coaxial cable can be reliably soldered to the pin of the SMA connector.
The following picture shows a wire core that has fallen off. This will cause the radio to not receive any signals. You need to manually re-solder it and reinstall the adapter.
