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73 Magazine (April 1963)

73 Magazine April 1963 (#31) Adjustable Regulated Power Supply - Playing around with transistors? Then have: one of these ...... W1ISI 8 Diode Noise Generator - Simple test instrument to tune up converters, receivers and stuff ...... Thomas 15 Selected Circuits - Polar relay test set great for the RTTY group ...... W4WKM 18 Decibles - What they are, how to use 'em, complete with a monograph ...... K1MRK 21 Vector VFO - Simple, stable oscillator for 80 meters. Great for DX-60 and the like ...... W7IDF 24 Wee Birdcage - Restricted space antennas are always of interest ...... K3LNZ 26 Protect You…