Ultrabeam 8 Band Beam UB-50, 3 El. 6-40m

Ultrabeam UB-50, RCU-06, 30m cable
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A special antenna model is the Ultrabeam UB-50, a compact beam which covers 7 to 50MHz. This antenna works as a 3-element fullsize beam on 6 to 20m. From 30m on the two front elements are completely retracted, only the rear element is used as a rotary dipole. To accommodate the required length of the radiator, the CuBe tape is bent by 90° at the end of the tubes and is directed in parallel to the boom. This results in a good SWR and a high efficiency, nearly the same as with a normal dipole radiator. Yet the rotating radius of this antenna is only 5.6m! The element support plates are constructed to support the additional weight of the outer tubes.

The UB-50 can be extended with an optional 6m passive element (1220.63). As 3-element beam (without the 6m option) the UB-50 has a gain of approx. 6dB on 6m, and a front/back ratio of 18dB. With the optional, passive 6m element the UB-50 reaches 8.2dB gain on 6m, at a F/B ratio of approx. 20dB.

The UB-50 is a very special antenna model in the Ultrabeam range, it is a compact beam which covers the amateur radio bands from 6 to 40m. This antenna works as a 3 element fullsize beam on 6 to 20m. When working on 30 and 40m the two elements in front are retracted, the rear element becomes the radiator, a rotary dipole. To accomodate the length of a full size dipole for these frequencies the copper band is turned in parallel to the boom. The result is a good SWR and high efficiency nearly identical to a linear fullsize dipole. With the folded element the rotating radius is only 5.6m! The element holders of the UB-50 are reinforced to carry the added weight on the elements.

The UB-50 was designed - as all Ultrabeam antennas - for operations on shortwave. The antenna also works on 6m but not with very good properties. For 6m the element distance is too small, due to the short boom. Working the occasional QSO will be possible with the use of a tuner. Much better results are achieved with the optional 6m kit. This kit adds two passive elements for 6m, which are mounted on the boom between the existing elements. With these extra elements the UB-50 antenna has a gain of approx. 8.2 dB and 20 dB front/back ratio.

For switching between the configuration as 3 element (6-20m) and as rotary dipole (30 & 40m) a coaxial relay is included, it is automatically engaged by the controller. This relay requires two additional wires in the control cable.

For this antenna we offer an optional truss kit for the elements. This kit contains a support pillar, which is installed vertically on the boom, plus guying ropes with all mechanical hardware required to install the guy wires to the extremities of the boom.

Included in shipment

  • Antenna 12215
  • Touch Screen Controller RCU-06
  • 30m control cable with connectors, ready to use. For other lengths see below.
  • Mast Clamp for 50 mm rotor tube diameter. For other diameters see below.

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Technical Data
Weight [kg] 27.00 kgs
Front/Back Ratio 28 MHz (dB) 30
Front/Back Ratio 21 MHz (dB) 27
Front/Back Ratio 14 MHz (dB) 25
Boom Size 60 x 60
Rotation Radius (m) 6
Mono-/Multiband Multiband
Number of active Elements 14 MHz 3.0000
Number of active Elements 10 MHz 1.0000
Number of active Elements 18 MHz 3.0000
Number of active Elements 21 MHz 3.0000
Number of active Elements 50 MHz 3.0000
Number of active Elements 28 MHz 3.0000
Number of active Elements 24 MHz 3.0000
Number of active Elements 7 MHz 1.0000
Bi-directional mode Yes, on 20, 17, 15, 12, 10m
180° Direction Reversal Yes, on 20, 17, 15, 12, 10m
Gain 10 MHz [dBi] 8.2
Gain 14 MHz [dBi] 8.2
Gain 7 MHz [dBi] 2.1
Max. Power [W] 3500 W
Boom length [cm] 530 cm
Supported Bands 10m, 12m, 15m, 17m, 20m, 40m, 6m
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