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Bulletproof Home

Bulletproof Home Security System

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Propagation

19 Mobile Burglar Alarm System WA4SAM

Beit beeping burgJar baffler,

25 The Burst Box WA7NMO

A real tone-ic for the FMer.

29 Power inverter w/Sine Wave Output , . . W70XD

For people with short extension cords.

33 450 MHz Preamp WB6BIH

1 0 dB gain on the receiver is a Jot easier than on the transmitter.

39 Roof Mounted VHF Whips WB6HYD

Phacts and phaJlacies.

47 LED Readout Crystal Switch WA3AJR

Make everyone green with envy,

53 Voltage Limit Sensor W4UXJ

Car battery warning light.

55 Build a Digital Clock with 19 inexpensive fCs WA6QVQ

Is th$ round clock doomed?

61 Portable Use for the Hfl-2A W2KPE

Judi Repealer approves of this.

63 Fixed and Mobile 2m Antennas WB8HEE

How to make your car look ridiculous.

65 Two Meter FM Transmitter WB6BIH

Roll your own.

71 Mini-Repeater Control System, Part II WA0ZHT

Have you >ead the book yet?

81 Audio Boost for Mobile Transceivers W2EEY

Mobile audio booster IC.

83 6m 5W Amplifier . K1CLL

For the kitchen table builder.

89 Hand Transceiver Madness W2NSD/1

Got yours yet?

93 QFSP on 180 kHz W5SOT

Tried 1 700m yet?

97 Solid State Automobile Burglar Alarm WA1KON

Blows horn or siren.

105 Circuits, Circuits, Circuits WR1AAB

Keep 'em coming.

73 Magazine is published monthly by 73, Inc., Peterborough, New Hampshire 03458, Subscription rates are $7 for one year in North America and ( '.S, Zip Code areas overseas, $8 per year elsewhere. Three years, 114, and $16 overseas. Second class postage paid at Peterborough NH 03458 and at additional mailing offices. Printed at Menashat Wisconsin 54952 U.S.A. Entire contents copyright 1973 by 73 Inc.. Peterborough NH 034581 Phone: 603-924-3873m Microfilm edition of 73 available from University Microfilmst A nn Arbor, Ml 48106m Magnetic tapes available from Science for the Blindr 221 Hock Hilt RdBala Cynwyd PA 19904. The nude cover is still in the works ~ so eat your heart out, if you are that hind of a debased person ~ or live one more month in fear if you are a gay libber or the mere sight of a girl is disgusting to you, as some readers have admitted. This month s cover emphasizes the progress that is being made in 220 gear with four of the 220 rigs and the first 220 repeater. More( much more, is coming — so think 220. FCC action on the possible CB occupancy of the low end of our 220 band is imminent —will it be delaying tactics or will it be the dreaded docket?

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