73 Amateur Radio Today – April 1971
Issue Contents:
What’s Really Different About FM?
– A lot a whole lot! …… K6MVH 12
Aftermath: A Noise Blanker That Works
– The author returns to the drawing board …… W8RHR 18
FM Intermodulation on 2m
– Chart for locating interference sources …… W6YAN 20
Hotroddinq Motorola’s Hybrid HTs
– A commercial bid for the 450 market …… W7PUG 28
Stability Without Crystals
– Introducing the Sentry Modcom whatever that is …… Staff 30
Switching Remote Linears
– or local linears …… W0HKF 32
Using Microwave for Repeater Links
– Microwave propagation for any purpose really …… Lenkurt 34
IC Repeater Identifier
– It will also identity any other station …… WB6BFM 49
Testing the National NCX 1000
– And enjoying every minute of it …… W2NSD/1 58
Build Your Own 2M FM
– Build this little hand transceiver …… K1CLL 60
Repeater Directory for 1971
– Every open repeater in North America listed here …… Staff 78
National FM Standards
– FM channels on the VHF and UHF bands …… W6YAN 100
The FM-marketplace
– Buyers’ guide to 2m FM transceivers …… Staff 102
Meter Evaluator
– New and-much better way to measure meter resistance …… Marovitch 116
A Simple Varactor Modulator for Going FM
– Changes AM rig to FM …… WA9TFY 121
FM Fun With a Scanner
– Listening to eight channels at once …… Staff 122
Low Cost Signal Source
– 1.8 to 450 MHz for tuning your receiver …… VE3GFW 124
Even More on Touchtone
– Answers to your questions on Touchtone …… W1IRH 126
A Solid-state Preselector
– Tubes you’re expecting? Read brand C magazine …… W5JJ 128
The Transistor 12 Watter for 10
– Three transistors and a barrel of fun …… W5PAG 131
A Slice of Nippon Culture
– How did an SWL article get into 73? Lordy! …… Staff 135
Ten Tee Receiver Test
– Nice new portable receiver …… WB2MYU 138
Getting Publicity for Ham Radio
– And boy! Can we use it! …… K0YTI 140
73 Amateur Radio Today – April 1971
