TransmitterHunting-RadioDirectionFindingSimplified.pdf

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TRANSMITTER
HUNTING
RADIO DIRECTION
FINDING SIMPLIFIED
IOSEPH D. MOELL, KOOV, AND THOMAS N. CURLEE, WB6UZZ
TAB Books
Division of McGraw-HilL Inc.
New York San
Francisco
Washington,
D.C.
Auckland Bogota
Caracas Lisbon
London
Madrid Mexico City Milan
Montreal New Delhi
San Juan Singapore
Sydney Tokyo
Toronto
© 1987 by
TAB Books.
TAB Books is a division of McGraw-Hili, Inc.
Printed in the United States of America. All rights reserved. The publisher
takes
no
responsibility for the use of any of the materials or methods described in this book,
nor for the products thereof.
pbk
91011 1213141516 FGRlFGR 900987
Library of Congress Cataloging-in-Publication Data
Moell, Joseph D.
Transmitter hunting.
Bibliography: p, 315
Includes
index.
1. Radio direction finders. I. Curlee
,
Thomas N.
II.
Title.
TK6565.D5M64 1987
796.2
86-30140
ISBN 0-8306
-2701-4
(pbk.)
Contents
Preface
Introduction
1 RDF Is Born
The Very Beginni
ng-World
War II-Hams Aid the War Effort-Military RDF Today-Sport Hunting
Takes Off-FM Takes Over
vi
viii
1
2
3
Getting Started
Directive Gain Antennas-Homing DFs-Dopplers-Making the Choice for VHF-Marine DF Units-
Getting Good Maps-The Compleat Hunter
7
VHF Mobile Hunting Techniques
The Importance of High Ground-The Initial Bearing-Magnetic Declination-Getting Bearings Without
a Compass-Ready to Roll-Closing In-Navigating on the Run-Guessing the Distance-The End
Game-Hunting Like a Pro-Hunting as a Team-Coordinating a Cooperative Hunt
13
4
5
VHF Hunting with Directional Antennas
Simple VHF Antennas-Two Meter Loops-Other Instant Hunting Ideas-Aluminum Yagis-Quad
Antennas-Measuring Beam and Quad Performance-Phased Arrays-The ZL Special
26
44
All About S-Meters
VHF ·FM 8-Meter Circuits-External 8-Meters- The Amplified External Meter-Linearity Evaluation-
LED Meters-An Audible Signal Strength Indicator-S-Meters for HF AM/SSB Receivers-The
Bridge Circuit-FM Gain Block ICs
6
7
8
Knocking Down the Signal
External Attenuators-The Magic Antenna Switcher-Internal Attenuators-The Automatic Attenua-
tion Control
55
71
99
Equipping Your Vehicle
Through-the-Window Mounts-Mirror Mounts-Door Mounts-Sun Roofs and Convertibles-The Hole
in the Roof-Window Brackets-Window Coverings-Window Inserts-Direction Indicators
Homing DF Units
The Double-Ducky Direction Finder-Switched Cardioid Pattern Homing Units- The Little L-Per Direc-
tion Finder-The Happy Flyers DF-Determining Bearing Inaccuracies-Side-Step and Baseline Aver-
aging Techniques-The K6BMG SuperDF-Testing Homing DFs
9
Doppler DF Units
How Doppler DFs Work-Doppler DFs for Radio Amateurs->The Roanoke Doppler for VHF-
Modifications and Improvements-Hunting with Doppler DFs-Commerciai Doppler DF$-Other Dop-
pler DF Applications
120
10 Search and Rescue Hunting
ELTs and EPIRBs-The Civil Air Patrol-The US Coast Guard Auxiliary-The Happy Flyers-Amateur
Detection of ELT Alarms-Airborne Hunting-Advanced Interferometer Techniques
142
151
11 Weak Signal Hunting
Why Bother with Weak Signals?-Grabbing the Signal-A Build-It-Yourself Preamp-Using FM
Quieting-A Noise Meter for FM Receivers-Sideband Detectors for AM and FM Hunts-An Add-On
Sideband Detector-Signature Analysis
12 Sniffing Out the Bunny
Homing DF Units-The Body Fade-Sealing Up the Receiver-Primitive Sniffers-The Sniff-Amp-
Antennas for Sniffing-Systematic Sniffing
-Deluxing
Your Sniffer-Listening to the Signal-Other
Sniffer Uses
165
13 Planning For Hunts in Your Community
When and Where-Writing the Rules-Novelty Hunts-Finding Your Batting Average-Getting Greater
Attendance
182
190
14
You're the Fox
Finding the Perfect Spot-Preparing the T-The Tape Recorder-A Simple Transmitter Cycler-Tone
Boxes-Antennas for Hiding-Other Antenna Possibilities-Powering the Transmitter
-Remote
Control-Some Final Thoughts on Hiding
15 The Bunny Box: A Cigar Box Sized Rig for Hiding
Physical Layout-Audio and Timing-The RF Synthesizer-Triplers and Final Amplifier-Power and
Keying-Crystal Control-Other Bands and Variations
219
234
239
16 Hunting Without a Vehicle
Real Radiosport-Championship Rules-Asia, Too-Amateur Radio's Sporting Goods-Radiosport
for Americans
17
Hunting Below 50 MHz
Locating DX Signals-Loops for 15 to 50 MHz-Preamps-Unidirectional Loop Systems-Loops for
2 to 15 MHz-Setting Up for Loop Hunting-Adcocks for Base Stations-An Inexpensive Oscilloscope
Display

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