A multiband antenna that does not require a lot of space, is simple to construct, and is low in cost is the G5RV. Designed in England by Louis Varney (G5RV) some years ago, it has become quite popular in the US. The G5RV design is shown in Fig 8. The antenna may be used from 3.5 through 30 MHz. Although some amateurs claim it may be fed directly with 50-Q coax on several amateur bands with a low SWR, Varney himself recommends the use of an antenna tuner on bands other than 14 MHz (see Bibliography). In fact, an analysis of the G5RV feed-point impedance shows there is no length of balanced line of any characteristic impedance that will transform the terminal impedance to the 50 to 75-Q range on all bands. (Low SWR indication with coax feed and no matching network on bands other than 14 MHz may indicate excessive losses in the coaxial line.)

The antenna system shown in Fig 10 consists of a group of center-fed dipoles, all connected in parallel at the point where the transmission line joins them. The dipole elements are stagger-tuned. That is, they are individually cut to be A/2 at different frequencies. Chapter 9 discusses the stagger tuning of dipole antennas to attain a low SWR across a broad range of frequencies. An extension of the stagger tuning idea is to construct multiwire dipoles cut for different bands.

PETUNJUK PELAKSANAAN CONTEST 80 METER BAND

Pendahuluan.
Cilandak Amatir Radio Festival Contest 2007 diselenggarakan oleh ORARI Lokal Cilandak, maksud dan tujuan kegiatan ini sebagai ajang Keterampilan antara sesama anggota ORARI se Indonesia sekaligus menjalin kekeluargaan danmempererat persaudaraan sesama anggota melalui contest Amatir Radio .

Salam Amatir,

Dalam rangka mempromosikan tentang ORARI pada masyarakat umum, maka telah dilakukan Uji Coba Website ORARI Lokal Kramatjati sebagai sarana informasi semua kegiatan lokal Kramatjati dan sebagai media penyebaran kegiatan ORARI pada umumnya kepada masyarakat luas.

Adapun alamat / link website ORARI Lokal Kramatjati dapat diakses di :

           http://www.orarikrj.org/

Terima kasih,

Andy - YD0MVP