The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Michael A. Terrell"
Subject: Re: Antenna question
Date: Mon, 18 Nov 2002 07:41:13 -0500
Organization: Have you seen my bench? No, really! Where is it?
X-Mailer: Mozilla 4.61 [en]C-CCK-MCD (Win95; U)
gert baars wrote:
> What you describe here is 'stacking' antenna's. This means they must be 1/4
> wave apart. Then you need a stacking
> transformer which are hard to make. Combining two equal antenna's will
> provide only 3 dB's of gain.
> Better is to use one antenna with an amplifier that you can buy in a TV shop
> for reasonable price.
> "Dave Fenner" schreef in bericht
> > How are those side by side pair UHF yaggi array TV aerials
> > connected?
> > I have two separate identical TV antennas in my roof, facing
> > different directions. Each has own downlead. Now I would like to
> > re-mount them to increase gain from one direction. How are the
> > commercial pairs connected? Do I change connection at the top or
> > can I do something with the downleads at the bottom end?
> > I can see one way is a 3 coil transformer. Is there a simple trick
> > like the way you can make a balun by looping the inner wire somehow?
> > I just want to end up with a standard 70 ohm single co-ax connection
> > with a bit more signal. TIA.
> > Dave Fenner
No, he already stated they are aimed in different directions, so
there will not be 3 db gain. He needs a simple signal combiner to put
both signals on one 75 ohm coax. The splitter / combiner can be placed
at either end, but if it is indoors you don't have to worry about
waterproofing the case or connections. There are antenna switches
available, as well, to allow you to select a single antenna if there is
a severe ghosting problem.
Michael A. Terrell
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup