73 Amateur Radio Today – March 1978

73 Amateur Radio Today – March 1978

Issue Contents:

The New Improved “Best Keyer Yet”

– updating MINI-mOS …… K4JEM 22

The Powerful Grounded Antenna

– thrives on poor soil …… W0SII 26

How To Cut Costs On Power Supplies

…… W9HDA 28

You Too Can Go Digital

…… K2RB 32

Old Receivers – A Hidden Gold Mine

– updating those ‘405 receivers …… W6GXN 36

Old Rigs Can Live Again!

…… K41PV 40

Novices Paddle Your Way To Happiness

– super deluxe Novice keyer …… W0OGX 44

How Many pF is That Capacitor Really?

…… WA0ZCR 48

Exorcising Power Supply Demons

…… K41PV 52

Meet the Plastic Wonder

…… K0OXB/5 58

Don’t Miss the Excitement of QRP

…… K9SGZ 62

Is Your Repeater Up-to-date?

…… W4VGZ 66

1220 MHz -use It Or Lose It!

…… K1CLL 72

New Protection For Your Car

– simple force field system …… WA4GIM 76

The Great cover-up

…… W4FXE 78

The World Of Tone Control

…… K3JE/2 82

Solve Those Parallel Problems

…… N3IE 88

At Last! An RFI-free Computer!

– the Cromemco Z-2 …… WB6JYK 92

Programming Coil Design

…… K7SBK 98

If You Want To Know Where You Are

…… Burhans 108

Do Biorhythms Really Work?

…… W4KFT 110

From CB To Amateur Radio

…… WB4POH 114

Improve Your HW-2021

…… K1WXK 130

How Much Power Does It Draw?

…… Fowler 131

Surprisingly Low-cost Lab Supply

…… W6GXN 132

Wireless Monitoring For the Bionic Ham

…… W8FX/4 134

Flash Project For Camera Fiends

…… WA6UNK 140

Kerchunk Counter

…… W6NUI 143

The Solar-powered Ham Station

– one hundred Watts yet! …… W5VBO 146

The Cheaper Chip

…… W7JSW 150

The Go Pro HT Mod

…… W8FX/4 152

A 2m Antenna for the Perfectionist

– with considerable details …… WB2AWG 154

Are You Afraid To Build?

…… W4RYO 156

A Brass Horn For X-band

– simple 10.5 GHz antenna …… W1SNN 164

A Cheapskate’s Circuit Board

…… WA1BVD 168

Good Grief Not the 225 Again?

– yes even more flexibility …… WB2LEI 172

Avoid An Overvoltage Catastrophe

…… W7RXV 176

The Amazing Zener Sweeper

– big deal gadget tests zener diodes …… WB4YOD 178

How To Use A Varactor

…… W6JB 182

Can A Diode Replace A Relay?

…… Staff 184

Shock the Car-burglar

…… W1DIS 185

73 Amateur Radio Today – March 1978

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