WiMo Yagis for 2m and 70cm

On this page you will find:

• WiMo-Yagis DK7ZB design
• 70cm Yagis
• Dualband Yagis

General

Our Yagi antennas are made by WiMo, that means: Immediately available ex works German and english documentation No worries about spare parts Support directly from the manufacturer Special versions possible
WiMo Yagis are superior to other brands. Please compare on your own!	Several similiar antennas can be stacked for higher gain. To use the crossed yagis in all polarisation layers we offer a reange of phasing harnesses, antenna switches etc.
Dipoles
WiMo-Yagis use N-jacks (female), the balun is protected in the connector box!	Some other brand...
The dipoles are true folded dipoles with a Teflon balun mounted in the center feed. This is a non-compromise solution avoiding the known problem of RF travelling along the outer surface of the coax's shield. Similar to the 2-m antennas the connector is an N-type. The center feed box is absolutely weather proof, sealed and additionally filled with Styrofoam. The Teflon balun is embedded into the center feed box. As seen with other antennas there are no balun slopes hanging out of the connection box and no need to affix the slope somehow to the antenna. Consequently, this design has no problems whatsoever with humidity leakages.
Element diameter	Element mounting
WiMo-Yagis use 8mm diameter on elements (below)!	WiMo-Yagis use screw-on elements!
We utilize elements with a diameter of 8mm. This results in an extended bandwidth but same gain compared to thinner elements! The windload increases just a little bit which plays absolutely no role when using today's modern antenna rotors. Material of the elements: A highly conductive aluminum alloy we use to minimize the skin effect; DK7ZB has calculated (based on technical material from K6STI) that the losses due to the skin effect can add up to 0.8 dB for antenna elements made of stainless steel. Of course, the losses are even worse in the 70 cm band.	Fixed is fixed - we are not in favor of clamp-on connectors. The WIMO-Yagis feature elements which are fixed to the boom by means of stainless steel bolts and nuts. This guarantees low-resistance and un-hampered functionality for years to come. Each element is fixed to the boom by means of a 3 mm stainless steel bolt. We assure you we never "lost a boom" because of the additional screw holes in the boom!
Mounting hardware	Crossed yagis without strut!
WiMo-Yagis use stainless steel screws!	WiMo crossed yagis can be mounted diagonalyy or horizontally/vertically!
All nuts, bolts and washers are made of stainless steel with the exception of the mast clamp itself. This guarantees a long antenna life time. The antenna element mounts are made of Polyamide material which is highly resistant to the destructive effects of ultraviolet light. In case of the cross yagis the elements are fixed to the circular boom made of aluminum.	The antenna boom of the cross yagis is made of circular aluminum tubes (only exception is the 2 m 4-element antenna). The well designed and exceptionally manufactured mast clamp allows mounting of the antennas as well in a horizontal/vertical ('+'-Form) as in a diagonal ('X'-Form) shape. Because of the circular boom our cross yagis do not require an additional support strut; consequently the already perfect antenna diagram cannot be affected by the support strut...
Location of Mounting Clamp	German and english instructions
WiMo-Yagis allow balanced mounting of the antenna!	WiMo-Yagis have an excellent manual and description!
All long yagis with twin boom have a separate boom-connector for installation; such the mast clamp may be mounted independent from the boom-connection at the center of gravity.	The detailed English and German manuals contain also tips and tricks for stacking, combining etc.

State-of-the art designed long yagi for DX, EME etc. Optimized for 144.3 MHz, Bandwidth approx. 600 KHz. Optimized current distribution, therefore minimized real losses in the active element, very low additional losses caused by the 8 mm aluminum antenna elements. A 2 x 2 stack results in a gain of 21 dBD!
4x WY214, 4x WY7023, 4x SHF 2367 at DLØWIM	Directional diagram WY-214 long yagi

WiMo-Yagis DK7ZB design
No-Compromise Electrical and Mechanical Technology.

• Maximum possible gain at high bandwidth and good side lobe attenuation as well as good f/b ratio. These antennas offer the ultimate performance for the serious V/UHF ham operator for DX and all transmission modes. The basis for the antennas has been designed with the xxNEC computer simulation programs and have been verified by many real-life trials + tests.
• Design optimized for current:
  The inner electrical signature of the perfect yagi asks for homogenous current distribution from the active element to the tip of the antenna. Our yagis were optimized for an ideal current distribution profile. "Older" concepts display sudden current "jumps" between antenna elements which leads to reduced gain and bad side lobe attenuation and low f/b ratio.
• Minimum number of elements
  Other comparable types of yagis require 2-3 elements more and consequently introduce more losses. Keep in mind: Antenna gain mainly depends on the boom length of the antenna and not so much on the number of antenna elements!
• Broadband elements
  The elements used consist of high conductive aluminum material with a diameter of 8 mm. This represents the best compromise of minimizing losses on one hand and resulting wind loads on the other hand. When using thin antenna elements additional losses are being introduced as well as the significant effect of the skin effect in V/UHF frequency range. Yagi designs of such specifications fall short of 0.5 dB in gain mainly caused by bad conductivity!
• Well defined element mounting
  The element mounting displays long-term stability and durability by the use of ultraviolet-resistant Polyamid clamps. The electrical specifications do not alter nor change within many years of use.
  Would the mechanical construction introduce a direct fix of the antenna elements onto the boom by means of clamps it is very likely that corrosion alters the effective element dimensions (electrically) and consequently a slow process of antenna performance degradation would take place!
• G/T optimized, see also G/T-tables from VE7BQH

WY204 2m 4-Element Order No.	WY207 2m 7-Element Order No.		WY209 2m 9-Element Order No.
WX208 2m Kreuzyagi 2x4-Element Order No.		WX220 2m Kreuzyagi 2x10-Element Order No.

2x WY-209 at M0FGH (© M0FGH)

4x WY-209 at DL0VV (© DL0VV)

Geoff, MW0ATI writes about the WY-209:

From: rb
Sent: Wednesday, April 18, 2007 8:56 AM
To: wimo
Subject: RE: [Web] Other inquiries: update

Hi Volkmar,
I Have the antenna on the tower now,and I am very very pleased with
its performance,its the best beam antenna I have used on 2m so far
73
Geoff mw0ati

OM René writes:

From: René
Sent: Saturday, June 23, 2007 4:18 PM
To: wimo
Subject: RE: Receive confirmation, your WiMo order No xxxx


Volkmar

I'm operating PJ4EME the last 2 weeks.
I'm happy with the 4 x 9 el wimo yagi's
Till now I made 265 EME qso's, a vy good result.

73's René PE1L @ PJ4EME

Crossed yagis for EME

The permanent quest for the last 1/10th of a dB, however with linear polarisation... cross yagis are BETTER! Design according to DK7ZB: optimized current distribution over the antenna system, consequently low real losses. 2x14 elements, boom length 10.2 m, gain 15 dBD. The antenna has a circular boom without additional support strut, so there the pattern is not affected. The antenna has a 'guy tower' made out of rugged fibre glass tubes; the antenna is guyed both vertical and horizontal using UV-proof guy wires. High bandwidth is acheived using 'thick' elements with 8mm diameter. As all our WiMo Yagis this one is delivered with sealed folded dipoles with teflon balun and N-jack as well.

Option: High-Power-Dipole with max. power load 1200 Watt PEP on 2m, 800 Watt PEP on 70cm. This option has to be ordered per dipole, i.e. two times with the crossed yagis!

Hello Volkmar,
In october, finally, I finished the array.
As you can see from the pictures, I mounted the dipoles with the connectors
facing backwards and I built a T-frame for guiding the coax lines.
Additionally I have braced differently the booms, the "guy tower" is mounted
on the GFK masts so the bending forces do not discharge through the boom
mounting.

The system performed very well in the recent ARRL contest, first weekend.
Particularly I was favourably impressed by the lower noise with respect to
the preceding M2 array, evidently the secondary lobes are much smaller.
Cordially, Giorgio IK1UWL






4x WX-214 at IK1ULW

70cm Yagis

WY7010 70cm 10 Element Fore-mast mount Order No.	WY 2023 70 cm 23-Element The long yagis for 2m and 70cm are supplied with an aluminum strut and two mast clamps. Order No.	WX 7020 70cm Kreuzyagi 2x10-Element Fore-mast mount Order No.

Option: High-Power-Dipole with max. power load 1200 Watt PEP on 2m, 800 Watt PEP on 70cm. This option has to be ordered per dipole, i.e. two times with the crossed yagis!

WX-7037 in JW

WX-7037 in JW

WX-7037 in JW

Dual band Yagi for 2m and 70cm

	Type WY3000 Gain 2m 5,5 dBD Gain 70cm 8 dBD SWR <1,6 Max. Power load 2 x 200 Watt Length 1,4 m Width 1,05 m Connectors 2x N female   Weight 1,9 Kg Windload at 160km/h 100 N

No-compromise yagi for 2m and 70cm, consisting of a 3-element yagi for 2m range and a 6-element yagi for 70cm. Separate systems with nearly zero interaction between the two antennas. With separate coax feedlines both bands are useable at the same time! Fore-mast design, but the mast clamp can be installed in the center of gravity as well.

Diamond A-1430 Dualband Yagi 2m/70cm with only one connector

	Typ Diamond A-1430S7 Gain 2m 7.5 dBi Gain 70cm 9.3 dBi F/B ratio 2m > 11.5 dB F/B ratio 70cm > 8 dB SWR <1.5 Max. Power 100 Watt FM Length 1,2 m Width 1,02 m Connector 1x PL female   Weight 0.95 Kg Max. Wind speed 125 km/h Mast diameter 25 - 62 mm Wind surface 0.17 m³

Compact and lightweight dualband yagi antenna for 2m and 70cm, with one common connector. Requires only one cable down to the radio, ideal for dualband radios with integrated diplexer. Consists of a 3-element yagi for 2m and a 5-element yagi for 70cm. With it's little weight the antenna is perfectly well suited for portable operations or a vacation. The antenna is installed in front of the mast, the supplied mast clamp allows horizontal or vertical mounting.