ARLA/CLUSTER: Re: [CT-Com. & Tec.] HF multiband beam "MARÍA MALUCA"

[Filipe Lopes]

Já alguem testou esta antena ?

F. Lopes CT1ILT



2012/12/19 Carlos Fonseca - CT1GFQ <ct1gfqgrupos  gmail.com>

>   *HF multiband beam "MAR�A MALUCA"*
>
> *Published as an article on URE's magazine "Radioaficionados" on January
> 2009*
>
>
>
>     Invented by José Salvador Luiz Victor Marinaro (PY2BBP) in 1957, this
> antenna is more than a dipole, it is a dipole with a passive element which
> works as a director or reflector element so there is a directional gain.
> Works from 20 to 6 meter bands. In 12, 10 and 6 meter the passive element
> works as reflector instead of director, then a 180º rotation is needed to
> work the same direction.
>
>
>
>
>
>
>
>     To build the elements can be used aluminium pipes of several
> diameters, linked and fixed by screws, to get the needed lengths. The
> dipole stands its two parts by a pvc pipe and a methacrylate plate.
>
>
>
>
>
>
>
>     To feed this antenna a 450Ω ladder line is needed and antenna tuner
> too. Also a BALUN is needed which can be 1:1 or 4:1. Mine is a 1:1 current
> BALUN wound on a FT-240-43 core (12 bifilar turns).
>
>
>
>
>
>
>
>     Ladder line length is important because according to the length you
> cut it and frequency, impedance values can be so high than the tuner cannot
> match. Minimum length is about 13.7 meters. Then I added a RG-213 to reach
> my radio room. This length must be also adjusted to be matched by the tuner
> with SWR 1:1. The following diagram shows the instalation.
>
>
>
>
>
>     The ladder line must be insulated from metalic objects about 15 to 20
> cm. Can be replaced by two parallel RG-62 (93Ω) coaxial cables, then feed
> line will be 186Ω.
>
>
>
>
>
>     Map shows contacts I made when testing the antenna "Maria Maluca". In
> black color are 20 meter band QSOs, blue are on 17m. and red are on 15m.
> Mode was BPSK31 in all contacts, power 30-40W. The 80% of QSOs reported RST
> 599.
>
>
>
>
>
>
>
> *Technical data:*
>
> Bands:                        20, 17, 15, 12, 10 y 6 meter
>
> Gain:                         7.26 - 2.25dBi
>
> Front/Back relation (F/B):    6.63 - 0.48dB
>
> Bandwidth @ SWR 2:1:          20m.: 135kHz
>
>     17m.: >100kHz
>
>     15m.: 260kHz
>
>     12m.: >100kHz
>
>     10m.: 390kHz
>
> Max power:                    1000W
>
> Boom length:                  1.46 m.
>
> Longest element:              7.56 m.
>
> Turning radius:               3.9 m.
>
> Windload:                     0.2 m²
>
> Weight:                       3.6 kg
>
> http://perso.orange.es/isaac.dg/antena%20maria%20maluca.htm
>
> 73's de Carlos CT1GFQ
> SKCC#466
> REP#1406
>
> --
> Para mais informações/opções visite o site, e edite a sua conta:
> http://groups.google.com/group/ct-comunicacoes-e-tecnologias?hl=en?hl=pt-PT
>



-- 
Regards,
Filipe Lopes
CT1ILT aka CR6K
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