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From: "Dave Fenner"
Subject: Re: Antenna question
Date: Tue, 19 Nov 2002 05:45:03 -0000
NNTP-Posting-Date: 19 Nov 2002 05:45:41 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Michael A. Terrell" wrote in message
| 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
| > 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.
| > Cheers,
| > "Dave Fenner" schreef in
| > news:firstname.lastname@example.org...
| > > 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
| > > re-mount them to increase gain from one direction. How are
| > > commercial pairs connected? Do I change connection at the top
| > > 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
| > > like the way you can make a balun by looping the inner wire
| > >
| > > I just want to end up with a standard 70 ohm single co-ax
| > > with a bit more signal. TIA.
| > >
| > > Dave Fenner
| > >
| > >
| No, he already stated they are aimed in different directions,
| there will not be 3 db gain. He needs a simple signal combiner to
| both signals on one 75 ohm coax. The splitter / combiner can be
| 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
| a severe ghosting problem.
| Michael A. Terrell
| Central Florida
Well all that aside, I have done as I intended, pointing both toward
Crystal Palace. They (horizontal polarised) are stacked directly
one above the other, connected in the way Brian Salt instructed. I
did not take any care about distance between, I did not see how this
would be significant.
I have no means to measure result. However 'only' 3db seems a lot
to me, there is a significant improvement, I am getting more
channels and hardly any drop-out now.
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