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14_W_BROADBAND_LINEAR_FOR_7_AND_14MHz

2017-03-11 14:33  
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14_W_BROADBAND_LINEAR_FOR_7_AND_14MHz
Requires about 10-mW driving power. Frequency responseis essentially flat over 7-14 MHzfrequency range Diodes are 1N4003,Q8 is 2N2222A、Q9 is 2N3866, Q10 is 2N2270,and Q11 is 2N4037. RF chokes use 18turns No. 28 enamel on FT-37-43 ferrite toroid core. Primary of T2 is 30 turns of No. 28 enamel on FT-50-43 ferrite toroid core, with 4 turns No. 28 wound over cold end for secondary. T3 has 16 tums of No. 28 enamel for primary and 4 tums for secondary looped through BLN-43-302 ferrite core. Article gives test procedure.-D. DeMaw, Transmitter Design-Emphasis on Anatomy, QST, July 1978, p 23-25.