50 Ω impedance matching for the AMNVOLT MiniRadio’s SMA input

[DB9JG]

Since all versions of the AMNVOLT Mini Radio have a high-impedance input well above 50 Ω, I used a transformer circuit to match a 50 Ω coaxial cable fed from an active MiniWhip antenna.
The output impedance Z_{out} is a compromise between impedance matching and the practical number of windings.

This circuit will as well suit to optimize matching of any 50 Ω source to the receiver's input.