A 50 ohm match can be tricky outside a transmitter to match. One has to deal with ensuring the antenna , coax, and all connectors are all equal or close to the output impedance of the radio.
Let alone the external connections, is impedance matching as tricky when dealing with PCB layout, and internal components?
Does impedance only matter on the final amplifier stage because low power reflections won't make much of a difference in efficiency?
I have found circuits to build simple radio transmitters. If only a schematic is given, and no board layout, or construction notes are provided, how can I ensure the impedances are matched throughout the internal circuitry of the radio, so all the power goes to the external connector?