420_450_MHz_100_W_LINEAR

Published:2009/7/7 4:50:00 Author:May | From:SeekIC

Two Motorola 3-inch lengths and prepare MRF309 transistors in pusffipull require only 16 and W drive to deliver 100 W for transmitter applications. Circuit provides 8 dB of power gain at efficiency greater than 40% when operating from 28-V supply. Harmonic suppression inherent in push-pull operation is enhanced by seven-element low-pass filter at output. Q1and Q2 are bias resistors and must be insulated from heatsink with mica washers. T1 and T2 are transformers constructed from RG58 coax. Use 1/4 inch at each end to give total transformer length of 21h inches.H. Swanson and B. Tekniepe, A 100-Watt PEP420-450 MHz Push-Pull Linear Amplifier, Motorola, Phoenix, AZ, 1978, EB-67.



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