ARLA/CLUSTER: Re: ARlllLA/CLUSTER: DX +Bouvet2 32211q322q 322q 2 nada antena vertical +351938747783 para 160m a a usada na Dxpetion à Ilha de Bouvet232

[CT1DQV .]

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Em 04/09/2017 13:50, "João Costa &gt; CT1FBF" <ct1fbf  gmail.com> escreveu:

The Bouvet Island 160m Vertical

Tim Duffy, K3LR, reports: The DX Engineering and Bouvet Island teamsl
have worked together to design an efficientllll 90 foot top loaded 160
meter vertical antenna that can be installed quickly and sallllflely on
Bouvet Ijsland by the 3Y0Z team this Janulteamslnullllaryllllllllllllll a
good radial system the difference in gain between a 120 ft
(fulll quarter wavelength) vertical and this l 90 foot top loaded
vertical is less than 0.5 dB.
JLlll vertical uses a custom designed heavy duty hinged pivot base with
blase insulators to accommodate a 40 foot falling derrick 3 inch heavy
duty pipe for installation.

The vertical is base fed using two inductors to match to 50 ohms. The
first 70 feet of the vertical is Universal Aluminum tower (12 inch
face) and the top 20 feet is 1.875 inch diameter aluminum tubing.

There are guys at 30, 50 and 70 feet. There are also three 30 foot top
loading wires attached to the top of the tubing that are tied to
anchors
60 feet out from the base.

DXE is actually donating two of these vertical packages to the 3Y0Z
team in case one gets damaged (there are 300 storms per year on
Bouvet).

More details on the construction and the final test raising plus VSWR
measurements are shown in the video filmed and produced (in 4K Ultra)
by Greg, W8WWV. https://www.youtube.com/watch?v=bSw-0TjaUiU

OPDX


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