Re: QCX mini: RF output BNC or SMA #poll-notice
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RCA connectors are friction-rit, and this is adjustable. They are inexpensive, and are close to 50 ohms.
Impedance doesn really matter much at less than 0.01 wavelength.
Some of the connector decision may be relative to what people can find in surplus markets. Cheap
connectors are desirable unless the cheapness affects reliability.