Dipole vs EH Antenna, Comparative Antenna Testing using WSPR and Two Radios

Model: "WB5WPA Mark II Vert"

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 II Vert" EH Antenna, center line at 25 feet, EH antenna oriented vertically.

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) For WSPR reporting, the low-frequency radio was on the EH antenna, the high-freq radio was on the dipole antenna.


EH_Antenna Mark II Loop Input Coupling

The WB5WPA EH Antenna "Mark II Vert" mounted on 18 ft mast.
Antenna centerline = 25 ft.
Cylinders are 30.5" long each, 2" ID DWV cellular core PVC pipe


Operatonal and Technical parameters

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5-24-2013

PVC Pipe:  2" I.D. "DWV" Cellular-core PVC
Cylinders:  30.5" tall cylinders

Input Coil:  2T Below Tuning coil, position for lowest/best SWR
Tuning Coil: 19-Turns, adjust the windings around to tune for 40m WSPR freq

SWR  Freq       BW
 ----   ------    -------
  3.0    7006
  2.6    7011
  2.0    7019
  1.5    7026
  1.1    7037
   
  1.1    7049
  1.5    7059
  2.0    7066      47 kHz
  2.6    7072
  3.0    7076      70 kHz

 Q = 115

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Close up of the tuning coil and input coupling loop

Tuning coil (red wire) and 2-turn input coupling loop (underneath black PVC tape). Coax feed can be
seen coming up to input coupling loop.


Close up of input coupling loop and tuning coil

Close up of Tuning coil (red wire) and 2-turn input coupling loop (underneath black PVC tape)


Reference Dipole feedpoint

Ref. dipole feedpint at about 30'



The K9AN station is 1086 km at 42 deg AZ from transmitting station WB5WPA




The W4DJV station is 1336 km at 77 deg AZ from transmitting station WB5WPA



The WB2EEE station is 2190 km at 59 deg AZ from transmitting station WB5WPA






The WB2EEE station is 2190 km at 59 deg AZ from transmitting station WB5WPA



The VE6PDQ station is 2632 km at 334 deg AZ from transmitting station WB5WPA



The K7TSW station is 2639 km at 309 deg AZ from transmitting station WB5WPA




The F1VMV station is 8318 km at 47 deg AZ from transmitting station WB5WPA












 KL7OA at 2094 km and 310 deg AZ from transmitting station



WB2EEE at 2190 km and 59 deg AZ from transmitting station




VE6PDQ at 2632 km and 334 deg AZ from transmitting station





   DK6UG at 8225 km and 41 deg AZ from transmitting station