Dipole vs EH Antenna,
Comparative Antenna Testing using WSPR and Two Radios
Model: "WB5WPA Mark 3 Horz" EH Antenna
Two radios transmitting simultaneously, one exciting a 'reference'
antenna and another a test antenna using two different freqs to
differentiate the results at the spotting stations.
Ref Ant - A dipole with center at about 30', dipole is horizontal
Test Ant - A "WB5WPA Mark III Horz" EH Antenna, center line at 6
feet, EH antenna oriented horizontally.
Notes:
(1) The EH Antenna is fed via a coupling loop (Link coupled) near the
EH "Tuning coil"
and is not directly connected as normally depicted
on
most websites.
(2) The low frequency radio was on the EH antenna, the higher freq
radio was on the dipole antenna.
Note: To be added - plots of Mark 3 Horz vs ref dipole WSPR SNR
reports
Doc title: 40 Meter EH Antenna BW and Q measurements
Antenna: "WB5WPA Mark 3" EH Antenna, Horizontal
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(1) Performance using 12 gauge THHN PVC jacket wire; note the Q value
below
Coil form: Red HDPE Folgers 10.8 oz coffee jar
Wire: 12 ga. THHN PVC insulated wire
Loop (link coupled) input
Tuning coil: 16 1/2 - Turns wound tight
gap: 3"
6 ft above ground on PVC chair on table
14.3 % the size of a full size dipole
3.0 7009.8
2.6 7013.1
2.0 7018.7
1.5 7023.7
1.1 7031.6
1.1 7044.2
1.5 7051.4
2.0 7056.2 37.5 kHz
2.6 7061.1
3.0 7064.0 54.2 kHz
Q = 146
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(2) Performance using 10 gauge Silver-plated-stranded-copper Teflon
jacket wire;
note the Q value below
6-20-2013
Coil form: Red HDPE Folgers 10.8 oz coffee jar
Wire: 10 ga. Silver-plated-stranded-copper, Teflon
jacket
Loop (link coupled) input
Tuning coil: 18-Turns wound tight
gap: 3"
6 ft above ground on PVC chair on table
14.2 % the size of a full size dipole
3.0 6982.6
2.6 6984.6
2.0 6987.1
1.5 6989.3
1.1 6994.0
1.1 6998.8
1.5 7002.6 13.3 kHz
2.0 7004.8 17.7 kHz
2.6 7007.4
3.0 7008.7 26.1 kHz
Q = 306
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(3) Performance 1 week after no rain; note Q value increased
6-24-2013 No rain for about 1 week
Coil form: Red HDPE Folgers 10.8 oz coffee jar
Wire: 10 ga. Silver-plated-stranded-copper, Teflon
jacket
Loop (link coupled) input
Tuning coil: 18-Turns wound tight
gap: 3"
6 ft above ground on PVC chair on table
14.3 % the size of a full size dipole
3.0 7027.1
2.6 7028.2
2.0 7030.8
1.5 7032.8
1.1 7036.3
1.1 7041.5
1.5 7044.5
2.0 7046.4 15.6 kHz
2.6 7048.8
3.0 7050.1 23.0 kHz
Q = 340
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