[TowerTalk] Multi-band antenna projects
gbay
gbay@odi.com
Sat, 29 Aug 1998 12:22:57 -0400
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Many thanks to all who responded to my questions about top band antennas =
and the Gap vertical. Consensus on the Gap is that it's pretty good on =
80 but poor on 160. There's obviously a wealth of info here on the =
reflector and I really appreciate the offers of help. I'm trying to =
rethink and rebuild my antenna farm this fall and need to get my head =
straight now.
It would seem that the more info I get the more questions I have! =
Here's my latest list.=20
1. I've got enough space to make an inverted L by shorting out the =
Gap and running a wire from its top to the peak of my roof which is =
probably about 40 feet high. The total length including the vertical =
would be about 130 feet. (The Gap is about 10 feet down off the side of =
a hill. I suspect that this might make a fairly decent 160 antenna if I =
put in a good radial system. However, I lose the multi-band feature. =
Perhaps an 80 meter trap in the wire? That might get me two bands =
working better than the Gap alone...what do you think?
2. Another scenario is to try to load my tower. It is a TX-472MDP =
motor drive and I keep it retracted most of the time to keep the =
neighbors happy. The shunt feed would have to go up and down with the =
tower so I imagine that SWR repeatability would be a problem. Also, =
there would be no way to bond sections together electrically. Anyone =
ever try this??
3. Where does one get variable and fixed capacitors and inductors =
capable of handling 1.5KW for matching networks?
4. I'm also rethinking my KT-34. It's been great with over 300 =
countries confirmed. However, I now live by the ocean and I have to =
rebuild it frequently because of corrosion. I'd like to get 5 or 6 =
bands. I have a Cushcraft AW3-S with the 103 modification to cover 30 =
M. However, I've never put it up. One scenario would be to get an =
updated triband antenna and put the AW3-S on top. I'm a little concerned =
about all the metal up there as I only have a Ham IV rotator on a =
TX-472MDP tower. Also, potential interaction. Another scenario would =
be to buy a 5 band beam such as the Hy-Gain TH11DX. Do you have any =
thoughts as to which way to go? What do
you think of the Th11? Are there other 5 band beams that you would =
consider? If you were to get just a three band beam, what would you =
consider? BTW, I am limited to about a 22 foot turning radius.
Guess I've got a lot of questions...hope it's not too much to ask.
73, Gerry, W1XY
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<DIV><FONT color=3D#000000>Many thanks to all who responded to my =
questions about=20
top band antennas and the Gap vertical. Consensus on the Gap is =
that it's=20
pretty good on 80 but poor on 160. There's obviously a wealth of =
info here=20
on the reflector and I really appreciate the offers of help. I'm =
trying to=20
rethink and rebuild my antenna farm this fall and need to get my head =
straight=20
now.</FONT></DIV>
<DIV><FONT color=3D#000000></FONT> </DIV>
<DIV><FONT color=3D#000000>It would seem that the more info I get the =
more=20
questions I have! Here's my latest list. </FONT></DIV>
<DIV><FONT color=3D#000000><BR> 1. I've got =
enough space=20
to make an inverted L by shorting out the Gap and running a wire from =
its top to=20
the peak of my roof which is probably about 40 feet high. The =
total length=20
including the vertical would be about 130 feet. (The Gap is about =
10 feet=20
down off the side of a hill. I suspect that this might make a =
fairly=20
decent 160 antenna if I put in a good radial system. However, I =
lose the=20
multi-band feature. Perhaps an 80 meter trap in the wire? =
That might=20
get me two bands working better than the Gap alone...what do you=20
think?<BR><BR>2. Another scenario is to try to load my =
tower. It is=20
a TX-472MDP motor drive and I keep it retracted most of the time to keep =
the=20
neighbors happy. The shunt feed would have to go up and down with =
the=20
tower so I imagine that SWR repeatability would be a problem. =
Also, there=20
would be no way to bond sections together electrically. Anyone =
ever try=20
this??</FONT></DIV>
<DIV><FONT color=3D#000000></FONT> </DIV>
<DIV><FONT color=3D#000000>3. Where does one get variable and fixed =
capacitors and=20
inductors capable of handling 1.5KW for matching =
networks?<BR><BR>4. I'm=20
also rethinking my KT-34. It's been great with over 300 countries=20
confirmed. However, I now live by the ocean and I have to rebuild =
it=20
frequently because of corrosion. I'd like to get 5 or 6 =
bands. I=20
have a Cushcraft AW3-S with the 103 modification to cover 30 M. =
However,=20
I've never put it up. One scenario would be to get an updated =
triband=20
antenna and put the AW3-S on top. I'm a little concerned about all the =
metal up=20
there as I only have a Ham IV rotator on a TX-472MDP tower. Also,=20
potential interaction. Another scenario would be to buy a 5 band =
beam such=20
as the Hy-Gain TH11DX. Do you have any thoughts as to which way to =
go? What do<BR>you think of the Th11? Are there other 5 band =
beams=20
that you would consider? If you were to get just a three band =
beam, what=20
would you consider? BTW, I am limited to about a 22 foot turning=20
radius.<BR><BR>Guess I've got a lot of questions...hope it's not too =
much to=20
ask.<BR><BR>73, Gerry, W1XY<BR></FONT></DIV></BODY></HTML>
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