Wireman-J-Poles

The Vertical Sloping Dipole

The CE0Y-7-m-Triple-Leg

Vertical 2x7m-Double-Zepp

The Battle-Creek-Special The C-Pole

The CE0Y-7-m-Triple-Leg by DK7ZB

The 15-m-mast of DX-Wire

Transport length is 134 cm

Weight 2,6 kg

www.dx-wire.de

This antenna was used at the DX-peditions by CE0Y/DK7ZB and  CE2/DK7ZB in October 2010 with good results. The supporting structure is a 15-m-glassfibre mast of DX-Wire. The antenna can be used on all bands from 10-40 m. 

You need 4x 7-m-wires.The lower guys are the 7-m-radial-wires of the Triple Leg, the upper guys are insulated ropes made of dyneema. The antenna is fed with a 400-Ohm-Wireman cable. 

Of cause you need an symmetrical antenna tuner for this antenna. In this case the twinlead was 12 m long. See the impedance points in the tables below.

Band

Impedance at Feedpoint

with Wireman 3,20 m 

with Wireman 12 m 

Gain

Elevation angle

10 m

75 + j 395 Ω

41 - j 110 Ω

92 - j 426 Ω

+ 2,3 dB

9

12 m

256  - j 900 Ω

68  + j 314 Ω

60 - j 224 Ω

+1,46 dB

11

15 m

2960 - j 1265 Ω

52 - j 23 Ω

235 + j 900 Ω

0 dB

12

17 m

900 + j 1330 Ω

65 - j 180 Ω

233 + j 246 Ω

-0,5 dB

13

20 m

154 + j 108 Ω

444 + j 445 Ω

434 + j 439 Ω

-1,2 dB

15

30 m

60- j 31 Ω

306 + j 321 Ω

73 - j 166 Ω

-2 dB

18

40 m

28 - j 385 Ω

16 - j 100 Ω

125 + j 970 Ω

-2,4 dB

22

The impedances at the feedpoint show a problem at the 15-m-band (impedance to high, Voltage maximum). Therefore it is recommended to feed with Wireman-cable of 3,20 m or 12 m. With these lengths a tuner has the best conditions for matching. With 3,20 m the box with the tuner is mounted at the mast. From there a coax-cable is leading to the station. If you need a longer feeder, use 12 m to the tuner.

The SG-239 is used with great success for the feeding of the 7-m-Triple-Leg.

The input has a balun (2x5 turns PTFE-coax on FT117-77) and a choke for the 12 Volt input (10 turns wire on FT82-77).

The azimuth diagram on lambda/4 lengths is nearly like a circle (look for 30 m). If the length is greater than lambda/4 the radiation gets a figure like the diagram for 10 m.

If you need four "radials" (better for the supporting structure!) you can use that without any problems. Then you have no "Triple-Leg", it is now a "Quadruple-Leg".

The elevation plots for the band 10 m - 40 m. The tip of the Triple-Leg is 15 m above the ground