On 8/19/2014 8:21 PM, Dick NY1E wrote:
It works fine, splitter or combiner. Many say they work for both. I
had a pair of the longest UHF Yagis with corner reflectors. However,
you will not get the gain you do with a single antenna. An antenna gets
gain by increasing it in the desired direction and Reducing it in
unwanted directions. It's not just the combiner mismatch. The signals
add vectorially or algebraically so it's rare for the signals of both
to add. It's highly unlikely you will ever get a signal to cancel
because of the differences in gain UNLESS the two antennas are within
30-60 degrees of each other, the signal falls on a minor lobe of both
antennas and the phase difference is 180 degrees. OTOH However, unless
you are working stations right at the threshold, they will be fine.
With one at 90 feet and 160 degrees and one at 95 feet at roughly
300-310 From Midland I could receive most of the Detroit,
Lansing/Jackson as well as Cadillac and Traverse City areas with solid
signals, analog or digital. Roughly 20 stations. I used a combiner into
a preamp where the coax reached the tower from the antennas. The TV
antennas were about 20-25 feet below the 7L C3i 6-meter Yagi and about
30-35 feet below the 144/440 array with no problems either way. EXCEPT
if the 2-meter and 144 antennas ere pointed in roughly the same
direction, 160W on 2 would bother Ch 12 analog. No problems on digital.
Replacing the preamp was a once-a-year ritual, but back then the tower
was taking an average of 3 visually verified direct lightening strikes
per Summer. No verified strikes in the last 5 years. "I think" a near
strike a couple of weeks back took out my router and switch plus the NIC
on my wife's computer. I "assume" it was a near strike as there were no
other problems. Of course the tower took 17 verified hits with no
damage. Before the ground system was finished, I did lose a new
computer and the front end on a 2-meter rig.
73 and good luck,
Roger (K8RI)
Can I use a splitter to combine 2 TV yagis pointed in different directions?
Does making the feedlines from the spilitter the same length matter in this
case?
Dick NY1E
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