High frequency amplifier circuit for impedance conversion by emitter follower

Probe high frequency needle 10445 with line high frequency needle with 1 high frequency core can pass 3A

The following figure shows a circuit used by a high-frequency amplifier. The signal is output by a coaxial cable. The characteristic impedance of the cable is generally 50 ohms or 70 ohms. Therefore, impedance conversion is performed by the follower BG2.