WiMo UB-20MX Ultra Beam Dynamic Antenna Systems Instruction Manual

WiMo UB-20MX Ultra Beam Dynamic Antenna Systems

Product Information

Specifications:

• Model: UB-20MX / UB-50 / 2 EL. 6-40
• Revision: 1.3, 2023-10-13
• Manufacturer: WiMo Antennen und Elektronik GmbH
• Website: www.wimo.com
• Email: info@wimo.com.

Product Usage Instructions

Mounting the Elements to the Motor Unit:
Before inserting the GRP elements into the motor unit, ensure the PVC guide tube is fixed. Align the element with the motor during this process. If alignment is challenging, have a second person support the element while inserting the guide tube. Push the glued PVC pipes into the GRP telescope and insert it into the motor unit. Attach the rubber sleeve and tighten the clamps carefully to prevent detachment.

Mounting of Curved Sections and Side Tubes:
After attaching all elements to the motor units, proceed to mount the curved sections and side elements. Use fibreglass tubes with specific diameters for different models. Secure all curved sections and tube joints using thermally sealing jackets with high mechanical strength for strong, durable, and watertight joints.

Frequently Asked Questions (FAQ):

• Q: What should I do if a PVC guide tube detaches during installation?
  A: If a guide tube detaches, it can cause bending of the copper strip and affect the motor functions. Ensure guide tubes are mounted carefully to prevent detachment.

• Q: Are the mounting procedures different for various models?
  A: The procedure for mounting guide tubes is the same for all models with folded elements, including 2 EL. 6-40, UB-20MX, and UB-50.

INTRODUCTION

Some UltraBeam models operate on the 30 and 40-meter bands with folded elements. This allows you to work on these bands with full-size elements in the same dimensions as the 6-20 models.

This technique is applied to 2 and 3-element Yagi models. In these two models, curved sections are attached to the ends of the elements, which are connected by fibreglass tubes. This creates a corridor in which the copper tape can wind up and reach the required length to be resonant up to the 40-meter band. Figures 1 and 2 show in red the path and shape of an inverted “C” in which the folded dipole is operated on 40 meters.

NOTE:
This manual refers only to the assembly of the arcs, side elements, and the other specific parts of the antennas operating on 30m and 40m with folded elements. For all other antenna mounting instructions, see the “Standard” manual.

PVC GUIDE TUBES DRIVER 30-40

All UltraBeam models that operate on 30 and 40 meters with folded elements have internal guide tubes on the left and right elements that are connected to the motor unit. The guide tubes are an important part of the design so that the copper tape can also move inside the curves and the side elements without bending.

The guide tube consists of two sections of PVC pipe 2 x 1500 mm with a total length of 3 meters. “You can’t stick on dirt”: Degrease the ends of the pipe with thinner, spirit or similar and then avoid touching the bonding area. Join the two parts with commercially available electrician insulating tape (not supplied, Figs. 1 – 3). The adhesive layer of the insulating tape should ‘smear’ as little as possible and also be as heat-resistant as possible so that it does not dissolve later in the sun.

MOUNTING THE ELEMENTS TO THE MOTOR UNIT

Before inserting the GRP elements into the motor unit, the PVC guide tube must be fixed. During this process, the element must remain aligned with the motor! If your assembly facility does not allow this, a second person must support the element while inserting the guide tube (Fig.).

When mounting the element to the motor unit, push the previously glued PVC pipes into the GRP telescope, then insert the GRP telescope into the motor unit as far as it will go. This clamps the black funnel.

Then attach the rubber sleeve and tighten the clamps.

Important note
Mount the guide tube very carefully. In case of possible detachment of a tube, the copper strip will inevitably bend and affect the motor functions of the device.

The procedure for mounting the guide tubes is the same for all models with folded elements.

• 2 EL. 6-40
• UB-20MX
• UB-50

MOUNTING OF CURVED SECTIONS AND SIDE TUBES

Only after you have attached all elements to the motor units, you can mount the curved sections and the side elements.

• Fibreglass tubes with a diameter of 20mm are used for the side elements.
• The antenna 6-40 with 2 elements uses a single tube of 800 mm between one arc and the other. The UB-50 uses three tubes of 1,400 mm diameter connected by two glass fibre joints for a total length of 4200 mm.
• In both cases, all curved sections and tube joints are fixed using thermally sealing jackets with high mechanical strength and internal adhesive, which guarantee strong, durable and watertight joints.
• On the UB50, a “T” mechanically connects the end of the centre element to the side elements in such a way that the weight of the entire side element is distributed across all three elements.

2 ELEMENTS YAGI 6-40

• A heat gun (1500 – 2000W) is required to apply a thermo shrinking sleeve.
• The heating time varies depending on the outside temperature, and in any case, the correct temperature is reached when the inner glue comes out, creating a ring around the edges.
• Insert the side tube and the ends of the elements in the curves up to the maximum insertion (Fig. 1). Before heating the sleeves, check that the side tube is parallel to the boom to avoid a typical “candy” shape.
• Push the sleeves exactly into the centre of the bonding area and heat them as described above. (Fig. 2)

NOTE:
Clean the joint surfaces of the pipes and curved segments before applying the sheathing. Avoid any twisting and movement of the joint until it has cooled down completely. The curves have drain holes, please make sure that they face downwards (Fig. 3).

UB-50 Yagi

The work steps for producing the arch transitions are identical to those of the “2-element version”. The difference between the two is the length of the longer side section, which is made up of three segments and also has a T-shaped centre support (Fig. 4).

Before connecting the three elements with joints, you must insert the “T” support. Slide into the T-tube element, which will be placed in the centre. Without fixing it will be aligned with the middle element of the antenna at the end of the assembly.

Join the 1400 mm tubes by placing the 10 cm long tubes exactly in the centre concerning the joint (Fig. 4-5). Slide the heat shrink sleeves over them and heat them to the correct temperature (Fig. 6). Drill a small 2-3 mm hole on the same axis in the centre in both junctions (Fig.7).

NOTE:
It is important to check that the holes are facing down before heating the heat shrink tubing that holds the entire side element to the curves.

FASTENING/ADJUSTING THE “T” SUPPORT

UB-20MX

• Model UB-20MX differs from UB50 in the size of the elements and the boom. In addition, 2 elements operate on the lower frequency.
• Regarding the mounting instructions of the curves and side elements, they are identical to the UB50 described in this manual.
• In these two models, the PVC guide tubes are mounted on both sides of the external antenna.
• The figures show the copper band path that allows the two antennas to operate as a 2-element Moxon configuration at the lowest frequency at which the model operates.

TELESKOPIC ELEMENTS

SIDE TUBES/GUIDE TUBES

NOTE:
The sizes listed in the table apply to one antenna side only.

ANTENNA DIAGRAMS

2 ELEMENTE 6-40

UB-20MX Diagram

• POSIZIONAMENTO MOTOR UNIT SU BOOM
• POSITIONING MOTOR UNIT ON BOOM

UB-50 Diagram

• POSIZIONAMENTO MOTOR UNIT SU BOOM
• POSITIONING MOTOR UNIT ON BOOM

Note:
UB20 – UB50 – are models with dual-driven elements, download the manual “Switch”.

WiMo Antennen und Elektronik GmbH

• Am Gäxwald 14, D-76863 Herxheim
• Tel. (07276) 96680 FAX 9668-11
• http://www.wimo.com.
• e-mail: info@wimo.com.

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