For SunSDR2 PRO we recommend a pigtail adapter when incoming coax is RG8/213 or larger type.
Mini UHF (male) to SO239 (UHF/PL female) pigtail adapter with 30 cm high quality RG58 coax.
BNC male to SO239 (UHF/PL) female adapter for connecting antenna with UHF connector to Xiegu X5105 or other transceivers with BNC antenna connector.
Headphones attenuation adapter lowers the audio level in headphones when connecting to a speaker output. This makes the volume more comfortable and helps improve signal to noise radio by reducing hiss generated by the speaker amplifier.