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EH Antennas for Hams September 2004 by Ted Hart W 5 QJR 6/6/2021 Courtesy of EH Antenna Systems EH ANTENNA SYSTEMS 2

What Is An EH Antenna? It is a revolutionary concept that allows small antennas to outperform large antennas. 6/6/2021 EH ANTENNA SYSTEMS 3

EH Antenna – An Example Located at Eatonton, Georgia 6/6/2021 EH ANTENNA SYSTEMS 4

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size 6/6/2021 EH ANTENNA SYSTEMS 5

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size » + Low Height 6/6/2021 EH ANTENNA SYSTEMS 6

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size » + Low Height » + No Radials Required 6/6/2021 EH ANTENNA SYSTEMS 7

EH ANTENNAS ARE DIPOLES 6/6/2021 EH ANTENNA SYSTEMS 8

A 20 Meter EH Antenna 6/6/2021 EH ANTENNA SYSTEMS 9

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size » + Low Height » + No Radials Required » + Broad Bandwidth 6/6/2021 EH ANTENNA SYSTEMS 10

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size » + Low Height » + No Radials Required » + Broad Bandwidth » + High Efficiency 6/6/2021 EH ANTENNA SYSTEMS 11

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size » + Low Height » + No Radials Required » + Broad Bandwidth » + High Efficiency » + Low EMI 6/6/2021 EH ANTENNA SYSTEMS 12

What Are The Defining Parameters Of An EH Antenna? __________________________________________________ » Small Size » + Low Height » + No Radials Required » + Broad Bandwidth » + High Efficiency » + Low EMI _____________________________________________________ » = A Great Antenna for Hams 6/6/2021 EH ANTENNA SYSTEMS 13

The Number 1 Question, does It Work? * FCC Type tests prove it is a very good AM Broadcast Antenna * Many Hams use home made EH Antennas *Companies in Italy and Japan manufacture EH Antennas for Hams *EH Antennas are in commercial use * EH Antennas will be the preferred choice in the future for most communications applications 6/6/2021 EH ANTENNA SYSTEMS 14

QUESTION #2 – HOW DOES IT WORK? HIGH CURRENT H FIELD E FIELD 6/6/2021 EH ANTENNA SYSTEMS 15

The Evolution Of The EH Antenna L+L NETWORK L 1 Coax Phasing Coil L 2 C 2 6/6/2021 EH ANTENNA SYSTEMS 16

The Evolution Of The EH Antenna L+T NETWORK L 2 L 1 Coax Phasing Coil C 1 6/6/2021 C 2 EH ANTENNA SYSTEMS 17

The Evolution Of The EH Antenna *STAR* EH ANTENNA CYLINDER PHASING COIL CYLINDER TUNING COIL COAX REACTANCE COIL 6/6/2021 EH ANTENNA SYSTEMS 18

EH Antenna Analysis Program 6/6/2021 EH ANTENNA SYSTEMS 19

EH Antenna Analysis Program Measuring 3 d. B Resistance Definition - - - Q=XL/R=F 0/BW Therefore: R = BW*XL/ F 0 Radiation Resistance = 3 d. B Resistance – Loss Resistance 6/6/2021 EH ANTENNA SYSTEMS 20

EH Antenna Analysis Program 6/6/2021 EH ANTENNA SYSTEMS 21

EH Antenna Analysis Program C = 0. 55*L/D*D + 2. 06*D 6/6/2021 EH ANTENNA SYSTEMS 22

EH Antenna Analysis Program 6/6/2021 EH ANTENNA SYSTEMS 23

EH Antenna Analysis Program 6/6/2021 EH ANTENNA SYSTEMS 24

EH *STAR* ANTENNA CYLINDER PHASING COIL CYLINDER TUNING COIL COAX REACTANCE COIL 6/6/2021 EH ANTENNA SYSTEMS 25

ROLL YOUR OWN EH ANTENNA • STEP 1 - OBTAIN TEST EQUIPMENT • SIGNAL GENERATOR – FIELD STRENGTH METER – VSWR BRIDGE – IMPEDANCE BRIDGE (NICE) 6/6/2021 EH ANTENNA SYSTEMS 26

PREFERRED TEST EQUIPMENT 6/6/2021 EH ANTENNA SYSTEMS 27

ROLL YOUR OWN EH ANTENNA • STEP 2 – BUILD COAX CHOKE ABOUT 1/8 WAVELENGTH OF COAX WOUND IN A COIL LOCATE ABOUT 3 FEET BELOW ANTENNA 6/6/2021 EH ANTENNA SYSTEMS THE 28

COAX CHOKE 6/6/2021 EH ANTENNA SYSTEMS 29

ROLL YOUR OWN EH ANTENNA STEP 3 - ASSEMBLE THE ANTENNA DO NOT TRY TO MAKE THE FIRST ONE PRETTY –USE ALUMINUM FOIL OVER PLASTIC PIPE USE 2 TURN FEED TAP – NO SOURCE COIL YET 6/6/2021 EH ANTENNA SYSTEMS 30

75 METER EH ANTENNA 6/6/2021 EH ANTENNA SYSTEMS 31

ROLL YOUR OWN EH ANTENNA STEP 4 A - TUNE THE ANTENNA MEASURE OPERATING FREQUENCY WITH FIELD STRENGTH METER – TAP TOP OF TUNING COIL TO CHANGE FREQUENCY 6/6/2021 EH ANTENNA SYSTEMS 32

75 METER TUNING COIL 6/6/2021 EH ANTENNA SYSTEMS 33

ROLL YOUR OWN EH ANTENNA STEP 4 B - TUNE THE ANTENNA PLOT IMPEDANCE or COMPARE MAX RADIATION AND MINIMUM VSWR FREQUENCIES 6/6/2021 EH ANTENNA SYSTEMS 34

IMPEDANCE WITHOUT REACTANCE COIL 6/6/2021 EH ANTENNA SYSTEMS 35

ROLL YOUR OWN EH ANTENNA STEP 4 - TUNE THE ANTENNA C – INSTALL SOURCE COIL D – ADJUST FEED FOR 50 OHMS E – RECORD IMPEDANCE PLOT 6/6/2021 EH ANTENNA SYSTEMS 36

IMPEDANCE WITH REACTANCE COIL 6/6/2021 EH ANTENNA SYSTEMS • 3 d. B Bandwidth = 269 KHz 37

EH Antenna Analysis Program 6/6/2021 EH ANTENNA SYSTEMS 38

HEIGHT VS. RADIATION ALONG THE GROUND. 6/6/2021 EH ANTENNA SYSTEMS 39

WEB SITE • www/eh-antenna. com 6/6/2021 EH ANTENNA SYSTEMS 40