Quote:
Originally Posted by Tim58hsv
I'm also going to try to hook them together like they do the U8000 so as to avoid using two baluns, two cables, and a combiner. Should get less signal loss if that works. If not then it's two baluns, two cables, and a combiner.
And Thanks Again. You're the bestest  |
The Two-Antenna Trick (outdoor version)
Stacking multiple antennas
If you can make sense of that chart, it hold the answers.
Note at 20 inches you get the first null about 30 degrees at channel 35. Then look at the second lobe, which is off the chart past 60 degrees. Remember the black CH 60 line no longer matters. So Channel 35 is about the middle of the new band. This means there is a one forward lobe and no grating or side lobes at 20 inches. As you get farther apart you start getting side lobes.
Just opening up the gap between the center of the two antennas to 25 inches, will create a significant second lobe 53 degrees either side of the main lobe. This could be good if there is a station there you want or very bad if your worst mulitpath comes in at that angle.
Moreover if all your stations are not in a central location, like my UHF are spread across 53 degrees, you can run on of the antennas out of phase by reversing the wires on the balun and create a 2 strong lobe pattern, without the 3
db loss of just combining two antennas pointed in different directions.
If you have any kind of spread on your stations up to about 60 degrees you could look into running one out of phase.
The Two Antenna Trick (indoor version)
Silver Sensor
Notice here Ken does stack them side by side staggered to kill mulitpath.
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Ken talks about building a phasing harness here. It's non-trivial.
You gain 0.5
db for all that work, if and ONLY if you do it right compared to 2 baluns and a combiner. If you build it right, you will still end up with a 300 ohm feed point and still have a balun. Chances are any design you try will not be worth the work and not be as good as 2 baluns and a combiner.
