WY-209 Yagi 144 MHz, 9el, 1200W
WY-209 Yagi 144 MHz, 9el, 1200W
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As of 01.07.2021, in B2C distance selling (transactions with end consumers), the previously applicable VAT delivery thresholds in the EU will be abolished and tax amounts will be owed directly in the country of delivery.
The so-called "distance selling regulation" will then apply.
From this point on, cross-border deliveries of goods to non-entrepreneurs will be taxable in the destination member state, and the corresponding amount of VAT will be payable there.
This means, for example, that as of 1.7.21, 20% VAT will be shown on invoices for deliveries to France, and 25% VAT will be shown on invoices for deliveries to Italy. The recipient in Italy therefore no longer benefits from the 19% VAT rate in Germany.
Classic VHF Yagi according to DK7ZB, max. 1200W transmit power.
The WY-2xx antennas from WiMo are proven Yagi antennas for the 2m VHF band, used by many contest and DX stations for many years. The mechanical construction is a good compromise between robustness and low weight.
The 9-element Yagi is the largest of the WiMo VHF Yagis, the model with the highest gain. The 5m long boom still fits on most terraced houses, for additional stabilisation this antenna has a support strut below the boom.
Features of the WiMo Yagis
- Highest possible gain
with high bandwidth and good side lobe and return loss. Thus, the antennas are oriented towards the demands of serious VHF amateurs who need a powerful antenna for long-distance traffic and all operating modes. The design principles of the Yagis were worked out with computer programmes calibrated at NEC and verified by many test setups.
- Current-optimised design
Within a yagi structure, the aim is to achieve uniform element currents from the centre of the exciter to the end of the antenna that do not fall too sharply. The yagis were designed for an optimal current profile. In older designs, there are jumps in the current assignment of the elements, resulting in less than fully utilised gain and poorer side lobe and return loss.
- Minimum number of elements
Other Yagis of comparable length have 2-3 elements more and thus more losses. Note: Antenna gain depends first on the antenna length, not on the number of elements!
- Broadband elements
Only highly conductive aluminium tubes with a diameter of 8 mm are used for the elements. This represents the best compromise between minimum losses and the resulting wind load. Thin steel elements cause considerable additional ohmic losses and the skin effect, which is already very effective with VHF. Yagis with such elements give away more than 0.5 dB gain due to poor conductivity!
- Defined element mounting
Long-term stability with UV-resistant polyamide clips. This means that there is no change in the electrical data even after years. If the elements were fixed directly to the boom by metal clips, oxidation could gradually change the effective element lengths and thus the antenna data over time!
- Encapsulated dipole baluns
The dipoles are real folded dipoles with Teflon baluns in the dipole box. So no forced matching with the well-known cladding wave problems! The 2m antennas are also connected via an N-socket. The dipole boxes are absolutely weatherproof, cold-welded and additionally foamed. The Teflon balun is completely inside the dipole boxes. There is no balun loop that protrudes from the junction boxes into the antenna and is then usually attached to the antenna more or less well with adhesive tape! As a result, there are also no leakage problems at the twice-passage of the balun loop through the dipole box.
- Robust construction
Except for the mast clamp itself, only screws, nuts and washers made of stainless steel (V2A) are used to ensure a long service life of the antennas. The element holders are made of UV-resistant polyamide, in the case of the cross yagis with round tube boom they are made of aluminium.
- German manual
The manual contains all the technical data and also information on staking and interconnecting several identical antennas.
|Frequency Range||144-148 MHz|
|Boom length [cm]||500 cm|
|Gain 144 MHz [dBi]||14.5|
|Max. Power [W]||1200 W|
|Design of antenna||Yagi|
|Antenna Type||Directional Antenna|
|Half Power Beam Width (3dB) Horizontal||34|
|Half Power Beam Width (3dB) Vertical||36|
|Stacking Distance horizontal (cm)||340 cm|
|Front/Back Ratio 145 MHz (dB)||23|
|Stacking Distance vertical (cm)||322 - 328 cm|
|Number of Elements||9|
|Number of connectors||1|
|Antenna mount||Center Mount|
|Weight [kg]||3.40 kgs|