1_W_EXCITER_FOR_7_AND_14_MHz

Published:2009/7/8 4:25:00 Author:May | From:SeekIC

Developedfor use in simple solid-state VFO transmittercovering 40 and 20 meters for low-power operation Adequate drive can be provided by any 7-MHz VFO that develops 0.45 VRMS across 1000-ohm load. Circuit consists of olass A bufferl amplifier Q1 and keying switch Q2. Q3 is class C amplifier on 7 MHz (40m) and frequency doubler on 14 MHz (20m). Q1 is MPS6514. Q2 is 2N3906 or equivalent, Q3 is MPS-U31. All trans-former cores are Amidon T-50-2.—A. Weiss, QRP, CQ Nov. 1971, p 54-58 and 88.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Amplifier_Circuit/1_W_EXCITER_FOR_7_AND_14_MHz.html

Print this Page | Comments | Reading(3)