73 Amateur Radio Today – March 1970
Issue Contents:
Extra Services From Your Grid Dip Oscillator
– Like checking crystals tuning FM receivers and such …… WA4UZM 18
Reverse-current Charging
– Turns out you really can recharge flashlight batteries! …… K8YUC 20
A Poor Man’s Frequency Meter
– Combines surplus from two services …… W6YAN 24
Professional PCs From Roll-Your-own Negs
– Eliminates drafting camera work and darkroom entirely …… K6MVH 29
How I Read The R.O.’s Handbook & Found Happiness
– Instant profundity …… Johnson 36
A Look At Amateur FM Standards
– Or how do we get out of this mess? …… WB6DJT 38
An Inexpensive RF Wattmeter
– Surplus meter for those too cheap to buy a regular wattmeter …… WB4MYL 43
A Remote Multifrequency Oscillator For Surplus FM Units
– Drive people crazy on lots more FM channels with this …… W2ACM 44
Add Spotting to Your VFO
– If your VFO is unspotted …… K8BYO 49
Towards an Ideal Solid-state I-f For Amateurs
– Closing in on the state of the art with Bill Hoisington …… K1CLL 50
Ham Exchange
– Visiting foreign amateurs makes trips more enjoyable …… WA2ELA 58
Super Sixer
– Heath wouldn’t recognize it …… WA3AQS 60
Bob Bob Bobbin’ Along
– Special April feature article. Well it’s almost April …… K1YSD 62
The Dip Light
– A grid-dip meter with no grid and no meter …… VE3ECU 68
73 Checks Out The Kris Scanning Receiver
– Snazzy …… Staff 70
Two Conversions For The Motorola 41 V – Part 1:
AC Power Supply …… K9PKQ 72
Two Conversions For The Motorola 41 V – Part 2:
6 to 12V Filament Conversion – Here’s the surplus if you want to make an issue out of it …… W6YAN 74
A CW Monitor
– Using a 98 cent audio module you cheapskates …… WB2GQV 76
The Logical Approach To Surplus Buying
– Here’s your key to fun with those surplus logic circuits …… Kyle 80
Converting The Sonobuoy to a 2W FM Rig
– Two meters. Why not have some fun with this one? …… W1BYX 96
Easy Diode Testing
– Checking out those bargain diodes …… K4JK 97
Turning The AN/gRC-9 Into a Novice Rig
– 2-12 MHz transmitter-receiver …… W6JTT 98
Extra Class Study Course Part XIV
– Measurements …… Staff 104
VHF-fM And You
– Part of our Encyclopedia of FM; a good part …… K9STH 118
73 Amateur Radio Today – March 1970
