Fold Beam is a 2-element (20/17/15/12 / 10m, 6m optionaL)

uma conta · por **ALF007** Seg 8 Set 2014 - 2:58

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The fold Beam is a 2-element directional antenna for five amateur radio bands (20/17/15/12 / 10m, 6m optional). The antenna consists of wire elements which are mounted concentrically on a supporting structure. From the central support tube spreaders are held with the support cables in position, the support tube is simultaneously coaxial feeder for the spotlight. The reflectors and lamps are mounted on fiberglass spreaders.

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Specifications

Impedance 50 Ohm
Connection UHF female (SO-239), on request N female
Profit max. 5-6 dBi in free space (equivalent to approximately 3-4 dB over a dipole)
V / R ratio > 20 dB (band dependent)
SWR <2 over the entire band (20/17/15/12/6 m), 10m-band: from 28 to 29.3 MHz
Load-bearing capacity 1500 Watt
Elements tensile tinned Cu wire 1.0 mm (building 32 x 0.2) with PVC jacket black
Spreader Fiberglass high elastic and UV-fixed 10 mm diameter
Tensioning cables 1.5 mm Dyneema Rope with Polyester cover, UV resistant
Support tube Aluminum weatherproof alloy 30 x 2 mm
Fastening material continuous stainless steel A2
otherwise. plastic parts Injection molding of PBT (polybutylene terephthalate) black, impact modified, UV resistant
Turning radius approximately 3.20 m
Mass 6 kg
effective wind area approximately 0.25 m²
Folded dimensions 1.15 mx 15 cm x 15 cm
Attachment of fiberglass pipe fitting 130 mm long, 25.4 mm diameter, ie fits in telescopic mast with 30 x 2 aluminum tube
Low center of gravity, symmetrical design, low weight and small wind load allow for rotating the antenna using a small and inexpensive TV rotor.

Readings
SWR readings (measured with a calibrated telephoto Post Inc. LP-100 SWR / Wattmeter, TRX Icom IC-7000 power cable 20 feetRG-58U). Due to the cable attenuation are the values directly at the feed point of the antenna slightly higher.

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Manual

Fonte