Marine VHF antenna system and methodTheodore J GordonThomas A Gordon
Scale all frequencies of the final design by dividing the tabulated frequencies impedance scaling ratio, 2: fco = 3.3/2 = 1.65 f20dB = 4.81/2 = 2.405 The inductor values are scaled to 100 Ω by multiplying them by the square of the impedance ratio, where R = 2 and R2 = 4.0: L2,...
An RF input level between 1 to 20 volts is required. The nominal maximum modulation capability is ±1/2 radian of RF phase shift at all modulating frequencies within the above limits. Audio modulating signals should be between -20 dbm and a +10 dbm to satisfactorily modulate the RF signal....
VHF marine fixed mount |M25(1975) The first marine radio. A programming method using a diode matrix was adopted, and up to 25 channels could be programmed. With this radio, crystals were no longer needed for expanding channels, and it drew attention in the US market. ...