Not always
To: Repeater-Builder@yahoogroups.com
From: [EMAIL PROTECTED]
Date: Sun, 10 Aug 2008 23:19:52 -0500
Subject: RE: [Repeater-Builder] Height Gain figure
So if the antenna is already at 1000 feet
height and it is moved up another 100 feet to 1100 feet, you are going to
increase the range by 14 miles??
73
Gary K4FMX
From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Sunday, August 10, 2008 3:20
AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder]
Height Gain figure
It is interesting to see the many responses, none of which I have
problems with, but all seem to skirt your question. If you are moving the
site any distance from the present site, then it is very true that these
variables must be considered. If you are moving only a very short
distance from your current site, then, I believe what you are looking
for is a simple formula to givr a close guess of what to expect. I
think you will find that should yout take the square root of the change in
height, in this case, the square root of 100 which is 10, and mulitply that by
the square root of 2, which is 1.414, you will come up with an approximattion
of 14 or so miles improvement. Again, as others have pointed out, many
variables inter into the equasion, but then, the bumble bee can not fly either.
. . ..
Hope this helps.
73 and cheers,
Gene, W4FWG
************
-------------- Original
message from Chuck Kimball <[EMAIL PROTECTED]>: --------------
At one
point I had read a number for figuring out the gain you get by
increasing the height. Of course at the moment I'm unable to locate that.
ie: If I move the same antenna (VHF 2m) up a hill and gain 100' of
elevation, but it costs me the line loss (300'), did I really gain
anything.
I'll figure in the line loss, and adjust the hardline to minimize the
loss, but I'm looking for the number to compare how much gain (in db)
did I get with the increased height.
So... Anyone know what number is for gain as a function of height? or
know a reference I can look up.
Thanks
Chuck
n0nhj
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