MRF300 2 m power amplifier 144 148 MHz 500W from R3KR 100khz 40mhz 5w rf power amplifier broadband medium wave linear amplifier working voltage 12 15 v. This item is in the category Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers. Input and output impedance 50 euro. Harmonic suppression (typical) 20 db.