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Posted by on May 2, 2009, 9:52 pm
wrote:
>On May 2, 12:46?pm, t...@mucks.net wrote:
>> >Hi,
>> >Yeah! And add to it, height matters too. The higher the better is not
>> >really the case. You gotta hit the sweet spot height wise.
>> Huh? Height gain is real and exist for all frequencies. The only
>> time excess height will work against you is when your feed line losses
>> outweigh you height gain. You'll ?have to go very high for this to
>> happen on TV frequencies. There is no sweet spot unless you
>> are somehow physically obstructed.
>not necessarily true. radio waves (tv waves) are like waves on a pond,
>in places they add to make larger waves......... in other places they
>cancel one another.
>So you can go higher and get worse results
This in ONLy true when the antenna is only a few wavelength from the
ground. At best with a perfectly reflecting ground plane, that doesn't
exist, you may expect a 6db maximum gain at these additive reflection
distances, however this perfect ground planer does not exist and
height can easily give greater gains than 6db.
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Posted by HeyBub on May 2, 2009, 5:58 pm
tnom@mucks.net wrote:
>> Hi,
>> Yeah! And add to it, height matters too. The higher the better is not
>> really the case. You gotta hit the sweet spot height wise.
> Huh? Height gain is real and exist for all frequencies. The only
> time excess height will work against you is when your feed line losses
> outweigh you height gain. You'll have to go very high for this to
> happen on TV frequencies. There is no sweet spot unless you
> are somehow physically obstructed.
Height is not the case with satellite TV. Lower is better.
Up/down has no effect on reception, but having the dish at shoulder height
makes aiming easier and removal of snow, leaves, and bird nests a cinch. For
these reasons, lower is better.
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Posted by aemeijers on May 2, 2009, 1:41 pm
cshenk wrote:
> "HeyBub" wrote
>> Jimw wrote:
>
>>> not recall which end points toward the tv station transmitter.
>
>> Forget theory. Which direction gets the best reception?
>
> LOL! Ya beat me to it! Until I saw folks taking this seriously I was kinda
> thinking it was a joke post. Must be a 'man thing' there ;-)
>
> Real method, put up antenna but don't bolt tight yet. Turn antenna bit bit
> by bit until the best location is determined. Tighten bolts so it stays
> there.
>
>
Around here, I'd need about 3 different antennas, or a rotator. Several
of the neighbors have those 'flying saucer' omni antennas, with built-in
amps, but I'm not sure how well they work, and I'd have to rewire the
coax a tad (move the splitters inside) so as to not put any DC into the
satt receiver, which they do not like. I suppose I should try to catch
one of said neighbors out working in their yard, and ask what stations
they get. The web sites say I'm too far away from the xmitters for an
omni, but they always are conservative in their estimates. To put up a
real fringe antenna with a rotator, I'd either have to kill a tree, or
move the pole to other end of house.
--
aem sends...
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Posted by on May 2, 2009, 2:00 pm
>"HeyBub" wrote
>> Jimw wrote:
>>> not recall which end points toward the tv station transmitter.
>> Forget theory. Which direction gets the best reception?
>LOL! Ya beat me to it! Until I saw folks taking this seriously I was kinda
>thinking it was a joke post. Must be a 'man thing' there ;-)
>Real method, put up antenna but don't bolt tight yet. Turn antenna bit bit
>by bit until the best location is determined. Tighten bolts so it stays
>there.
I tried that once. I put up an antenna and took the tv up on the roof
to see where I got the best reception. For a moment I lost my
footing, and my $3800 sixty inch plasma tv went crashing to the
ground, never to work again. I tried to grab it as it slid down the
shingles, and I too went off the edge of the roof, falling some 30
feet to the concrete pavement below. Besides losing my $3800 tv, I
spent 9 weeks in the hospital, which cost me over $220,000 in medical
bills, and I have been in a wheelchair ever since, watching a $29
portable black and white Walmart closeout tv set, in the basement of a
rented apartment, paid for by uncle Sam, because I had to sell my home
to pay the medical bills.
Fred
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Posted by Bob M. on May 2, 2009, 2:36 pm
> "HeyBub" wrote
>> Jimw wrote:
>>> not recall which end points toward the tv station transmitter.
>> Forget theory. Which direction gets the best reception?
> LOL! Ya beat me to it! Until I saw folks taking this seriously I was
> kinda thinking it was a joke post. Must be a 'man thing' there ;-)
> Real method, put up antenna but don't bolt tight yet. Turn antenna bit
> bit by bit until the best location is determined. Tighten bolts so it
> stays there.
Real method? Hardly. Get an antenna rotator, a small motor that mounts on
the mast. The control is near the TV so you can move the antenna from
inside.
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