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Howdy, all.
Getting ready to move (retireing) to that sunny, balmy, flatland country =
otherwise known as Vermont. I'm really undecided how to construct the =
"right kind" of antenna system. I want to do it right the first time. =
Here's my questions. 'Scuse the rambling, pls.
I already own about 140 ft. of Rohn 25. That may be part of my problem, =
cuz I sure would like to use it. The problem? I want my antennas to be =
as high as possible, but, up in Vermont, ICE LOADING is a serious =
consideration. And, I've not been able to even get a SWAG on how much =
problem that is for 25G. Any PE's out there in HAM LAND who could tell =
me how to figure this. I'll guy whatever way is the right way. I'm =
inclined to use Phillystrand for at least the top guy set. =20
Now... my first problem is to decide how high to go. I like HF... all =
the bands. I'd like a tower tall enuf to be loaded on 160 or at least =
support a reasonably high inverted L antenna for top band. However, =
this band is my least favorite of the HF bands. =20
I plan on getting a T-10 LPDA from Tennedyne. That's approx. 10 sq ft. =
I'd like to not have to buy another rotator... I own two=20
HAM IV rotators now. I suppose I could, if needed, sell them and get =
one bigger one. =20
My terrain is mountainous. Well, for those of you out west, maybe it's =
just "hilly". My QTH is at 1650 ft. elevation, and there are higher =
"hill" tops within vision. To the northeast, there is a hilltop that is =
900 ft higher, exactly one mile away. To the west, also at one mile =
distance, is a hill that is 630 ft higher than me. To the southwest, a =
rise of 400 ft... at a mile and a quarter. =20
Also, my home there is a log home in the woods... surrounded on the =
north, east and south by red pine trees, approx 75 ft high. To the west =
the property drops rapidly to a small river and is mostly hardwoods.=20
There is one power line which brings electricity to the property line, =
but, it's about 450 ft away from the possible location of the tower. =20
The terrain is rocky, with lots of surface water, and water just below =
the surface. =20
Ok, that's the geography lesson. I calculate a take-off angle of =
approx. 11 degrees will clear the highest mountaintop. So, since my =
antenna is five band, from 20m to 10m, what would be the optimum antenna =
height for all these bands? =20
Then, at that height, would my Rohn 25G suffice, or should I bite the =
bullet and go to 45? I only want to do this once, but, I actually don't =
mind doing two towers. In fact, the thought occurs to me to maybe put =
my Cushcraft A4S at a slightly lower height, say 70 ft, on the 25G, and =
the T10 at about 95 ft, if feasible. I'd put a six meter yagi =
(smallish) on top of whichever antenna is the best place, and side mount =
a two meter yagi (maybe two, one vertical and one horizontal) on the =
tower.=20
So, any suggestions? Any folk out there who've done similar stuff? I'd =
really appreciate your suggestions and help.
Thanks
Tony Bean, W1SVU (was W5SVU up till February)
tonybean@bicnet.net
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<BODY bgColor=3D#ffffff>
<DIV><FONT color=3D#000000 size=3D2>Howdy, all.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Getting ready to move (retireing) to =
that sunny,=20
balmy, flatland country otherwise known as Vermont. I'm really =
undecided=20
how to construct the "right kind" of antenna system. I =
want to=20
do it right the first time. Here's my questions. 'Scuse the=20
rambling, pls.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>I already own about 140 ft. of Rohn =
25. =20
That may be part of my problem, cuz I sure would like to use it. =
The=20
problem? I want my antennas to be as high as possible, but, up in =
Vermont,=20
ICE LOADING is a serious consideration. And, I've not been able to =
even=20
get a SWAG on how much problem that is for 25G. Any PE's out there =
in HAM=20
LAND who could tell me how to figure this. I'll guy whatever way =
is the=20
right way. I'm inclined to use Phillystrand for at least the top =
guy=20
set. </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Now... my first problem is to decide =
how high to=20
go. I like HF... all the bands. I'd like a tower tall enuf =
to be=20
loaded on 160 or at least support a reasonably high inverted L antenna =
for top=20
band. However, this band is my least favorite of the HF =
bands. =20
</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>I plan on getting a T-10 LPDA from=20
Tennedyne. That's approx. 10 sq ft. I'd like to not have to =
buy=20
another rotator... I own two </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>HAM IV rotators now. I suppose =
I could, if=20
needed, sell them and get one bigger one. </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>My terrain is mountainous. =
Well, for those=20
of you out west, maybe it's just "hilly". My QTH is at =
1650 ft.=20
elevation, and there are higher "hill" tops within =
vision. To=20
the northeast, there is a hilltop that is 900 ft higher, exactly one =
mile=20
away. To the west, also at one mile distance, is a hill that is =
630 ft=20
higher than me. To the southwest, a rise of 400 ft... at a mile =
and a=20
quarter. </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Also, my home there is a log home in =
the=20
woods... surrounded on the north, east and south by red pine trees, =
approx 75 ft=20
high. To the west the property drops rapidly to a small river and =
is=20
mostly hardwoods. </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>There is one power line which brings =
electricity=20
to the property line, but, it's about 450 ft away from the possible =
location of=20
the tower. </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>The terrain is rocky, with lots of =
surface=20
water, and water just below the surface. </FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Ok, that's the geography lesson. I calculate a =
take-off=20
angle of approx. 11 degrees will clear the highest mountaintop. =
So, since=20
my antenna is five band, from 20m to 10m, what would be the optimum =
antenna=20
height for all these bands? </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Then, at that height, would my Rohn 25G suffice, or =
should I=20
bite the bullet and go to 45? I only want to do this once, but, I =
actually=20
don't mind doing two towers. In fact, the thought occurs to me to =
maybe=20
put my Cushcraft A4S at a slightly lower height, say 70 ft, on the 25G, =
and the=20
T10 at about 95 ft, if feasible. I'd put a six meter yagi =
(smallish) on=20
top of whichever antenna is the best place, and side mount a two meter =
yagi=20
(maybe two, one vertical and one horizontal) on the tower. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>So, any suggestions? Any folk out there who've =
done=20
similar stuff? I'd really appreciate your suggestions and=20
help.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Thanks</FONT></DIV>
<DIV><FONT size=3D2>Tony Bean, W1SVU (was W5SVU up till =
February)</FONT></DIV>
<DIV><FONT size=3D2>tonybean@bicnet.net</FONT></DIV></BODY></HTML>
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