73 Amateur Radio Today – February 1967

73 Amateur Radio Today – February 1967

Issue Contents:

Getting Acquainted With Integrated Circuits

– Here’s practical information on using inexpensive ICs …… Thorp 6

Using Low-cost FET’s on Six

– Two $1 FETs and a cheap PNP give 2 dB NF and high overload resistance …… W6AJF 11

Low Cross-modulation on Two

– A $ 1 FET makes an excellent mixer on two …… W6AJF 14

The 30P1 Linear Amplifier

– A peasant’s 30L1: Four 811As …… W1DBN 18

An Improved Multiplier for UHF

– Get enough local injection on 1296 MHz …… W6OSA 22

A Broad-band 80 Meter Vertical

– 3.5 to 4 MHz with no adjustments …… VE1TG 26

A Reliable UHF Directional Coupler

– Here’s a UHF bridge you can trust …… WA6SXC 30

A Solid-state Antenna Relay

– Fast low-loss high-power and efficient …… K2IYC 34

Video Camera Tubes

– There are lots of different types …… WB2GYS 38

A Semi-precision Variable Capacitor

– It’s accurate to 1 pF and uses a component that’s in almost every junk box …… W1DTY 42

Down with the Rotator

– A cheap useful scheme for small beams …… W3BTQ 47

Mobile Logs – Personalized

– Save time and trouble in mobile logging …… WB6KFI 48

Add a Crystal Filter to Your Receiver

– For less than $10 …… W1USM 50

A Reactivator for the Semiconductor Activator

– In other words a battery charger …… K6EAW 52

The Ancient Marriner

– An antenna tuner for coax-fed beams …… W6BLZ 54

Climbing the Novice Ladder

– Part 3 …… W7OE 56

Portable Operation Without Tears

– Useful hints for the prospective portableer …… K3LNZ 60

Practical Tips on Transistor Transmitters

– You won’t want to miss this one unless you’re an AO …… K0CJF 64

UHF-microwave Phased-locked Oscillator

– Stable within less than 1 Hz at 6 GHz! …… K3OJK 68

73 Tests the Eicocraft CPO

– Eico’s new line of inexpensive kits looks like fun …… 78

100 Watts on Two With Compactrons

– Uses two 7894s in push-pull …… K1CLL 80

The Poor Man’s Occasional Antenna

– Cheap dirty and effective …… W7CSD 84

Rewinding the Power Transformer

– It’s not hard as this article explains …… WB2PTU 88

The Drake L-4 Linear Amplifier

– Drake’s new linear is very nice …… WlDTY 90

The Carrier Again

– Part 2 of “AM vs. the Carrier” …… W7CSD 94

A Simple Current Controller

– Very simple and cheap …… K5JKX 96

Equalizing AFSK Tones

– Some notes for RTTY’ers …… K8ERV 96

The International Crystal SBX-9 and SBA-50

– SSB exciter on 9 MHz and mixer to six meters …… W1DTY 100

The National 200

– National’s inexpensive new transceiver is attracting much attention …… W1DTY 104

An Universal Code Monitor

– A clever idea for a simple monitor …… K9VXL K9CLH 108

Gus: Part 20

– A crisis in the Indian Ocean! …… W4BPD 110

73 Amateur Radio Today – February 1967

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