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FAR_FIELD_TRANSMITTER

2016-04-04 14:17  
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FAR_FIELD_TRANSMITTER
Provides far-field signal source for tuning Yagi and other beam antennas used on amateur radio frequencies.Q1 is Pierce oscillator operating in fundamental mode of 7.06-MHz crystal to permit field-strength measurements at 14.12, 21.18, and 28.24 MHz for 20-, 15-, and 10-meter bands. An-tenna uses two 5-foot lengths of wire con-nected as dipole. T1 is Amidon core 750-2 with 22 tums on primary and 20 tums center-tapped on secondary. T2 is same core with 22-tum pri-mary and 5-tum secondary.-G. Hinkle, Closed Loop Antenna Tuning, 73Magazine, May 1976, p32-33.