Re: Doublet use?
Von: Ian Jackson (ianremovethisjackson@g3ohx.demon.co.uk) [Profil]
Datum: 21.06.2009 10:12
Message-ID: <L+biMcOjtePKFwo$@g3ohx.demon.co.uk>
Newsgroup: uk.radio.amateur
Datum: 21.06.2009 10:12
Message-ID: <L+biMcOjtePKFwo$@g3ohx.demon.co.uk>
Newsgroup: uk.radio.amateur
In message <h1ko7r$jk9$1@news.albasani.net>, Vince <vince.buckland@googlemail.com> writes >The doublet used to be a popular HF antenna in the old days but >everyone seems to run G5RVs these days. Why? > >A doublet (fed with a proper ATU) takes some beating for a simple antenna. > The original G5RV was simply a doublet fed with 300 ohm twin feeder, and its main virtue was its radiation diagram on various amateur bands (good UK coverage on 80 and 40m, with a good lobe towards S America on 20m). The other advantage of the 102' G5RV is that you can get a 'reasonable' multiband match by using the combination of 300 and 75/50 ohm feeder. If coax is used, a series choke balun should be used at the transition. However, I general, a G5RV has no real advantage over a 'doublet' of a similar size, and twin feeder. -- Ian[ Auf dieses Posting antworten ]