dipole coiley?
 

hi

wanted to help a fellow ham set up an antenna on his terrace
it's kinda a best effort attempt naturally the building won't allow
anything 'outside' so he just has the confines of the terrace


the total length of the longest side of theterrace

about 15ft on the longest side so here is my question


i was going to use a sgc 237 as the dipole 'center' and extend the legs
from there

since the total space is short would it be more advantages to make the
leggs a coil like a slinky? will this be of any real benifit?

if so how many ''turns'' and how big dia each ''coil''


my other option was to mount the sgc on the center of the celing extend
the dipole horizontally about 7ft each side then down to the floor
vertically like upside down U



i wondered how a loaded verticle would be or even using a verticle whip
into the sgc because i am not shure how i could make a 'radial'
/counterpoise

i'd like to give him at least 40m to 10 i realize that the sgc
really can 'tune ' anything but if it's too far outa wack (away from
resonance etc) it would just work poorly



he put up a glass metal framed enclousure around the terrace the metal
is isolated but a strange shape for an antenna i could try to load
that perhaps using a wire around his apt as the counterpoise? would
this be effective?


he's up about 20 stories on a high point everything elese is lower far
as eye can see to the horizon


any help is surly appreciated he's an old timer that wants to get back
on the air


ml

dipole coiley?
 

ml wrote:
wanted to help a fellow ham set up an antenna on his terrace

I would be inclined to lay down as large a ground plane as
possible, i.e. floor the terrace with hardware cloth. Then
put up the longest possible center-loaded vertical in the
center of the ground plane. He has many of the same
constraints as a mobile antenna.
--
73, Cecil http://www.w5dxp.com

cloth?: dipole coiley?
 

In article ,
Cecil Moore wrote:

ml wrote:
wanted to help a fellow ham set up an antenna on his terrace

I would be inclined to lay down as large a ground plane as
possible, i.e. floor the terrace with hardware cloth. Then
put up the longest possible center-loaded vertical in the
center of the ground plane. He has many of the same
constraints as a mobile antenna.

thanks for the responce cecil, a little dissapointed more havn't
responded maybe i blame my poor writing skills but i'd really like to
help this guy out

what is hardwire cloth? never heard of it or did mean that just
figuratively

thanks and happy newyear to you and family

cloth?: dipole coiley?
 

ml wrote:
what is hardwire cloth? never heard of it or did mean that just
figuratively

Hardware cloth is a wire matrix where all the wires
are soldered together. The openings are square and
about 1/4"-1/2" on the sides. It is commonly used
for small animal cages. I'm sure you know what it
looks like, just not familiar with its name. It makes
a better ground plane than chicken wire or hog wire.
It also makes a good top/end hat.
--
73, Cecil http://www.w5dxp.com

dipole coiley?
 

ml wrote:
hi

wanted to help a fellow ham set up an antenna on his terrace
it's kinda a best effort attempt naturally the building won't allow
anything 'outside' so he just has the confines of the terrace


the total length of the longest side of theterrace

about 15ft on the longest side so here is my question


i was going to use a sgc 237 as the dipole 'center' and extend the legs
from there

since the total space is short would it be more advantages to make the
leggs a coil like a slinky? will this be of any real benifit?

if so how many ''turns'' and how big dia each ''coil''


my other option was to mount the sgc on the center of the celing extend
the dipole horizontally about 7ft each side then down to the floor
vertically like upside down U



i wondered how a loaded verticle would be or even using a verticle whip
into the sgc because i am not shure how i could make a 'radial'
/counterpoise

i'd like to give him at least 40m to 10 i realize that the sgc
really can 'tune ' anything but if it's too far outa wack (away from
resonance etc) it would just work poorly



he put up a glass metal framed enclousure around the terrace the metal
is isolated but a strange shape for an antenna i could try to load
that perhaps using a wire around his apt as the counterpoise? would
this be effective?


he's up about 20 stories on a high point everything elese is lower far
as eye can see to the horizon


any help is surly appreciated he's an old timer that wants to get back
on the air


ml

Have you considered a horizontal loop fed with the SGC? At 20 stories,
it ought to be quite a performer. I assume the circumference of the
terrace is about 45 feet. The metal frame you mentioned could be a
problem, but it is a fairly costless and quick option to try.

Chuck

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cloth?: dipole coiley?
 

On Sun, 07 Jan 2007 07:35:39 -0600, Cecil Moore
wrote:

ml wrote:
what is hardwire cloth? never heard of it or did mean that just
figuratively

Hardware cloth is a wire matrix where all the wires
are soldered together. The openings are square and
about 1/4"-1/2" on the sides. It is commonly used
for small animal cages. I'm sure you know what it
looks like, just not familiar with its name. It makes
a better ground plane than chicken wire or hog wire.
It also makes a good top/end hat.

Check the link below.
http://www.phoenixwirecloth.com/

cloth?: dipole coiley?
 

helmsman wrote:
Check the link below.
http://www.phoenixwirecloth.com/

That is quite extensive. Here's more what I
had in mind:

http://www.twpinc.com/twp/jsp/product.jsp?type=4

http://www.marcospecialtysteel.com/hardwarecloth.htm
--
73, Cecil http://www.w5dxp.com

cloth?: dipole coiley?
 

Cecil Moore wrote:
helmsman wrote:
Check the link below.
http://www.phoenixwirecloth.com/

That is quite extensive. Here's more what I
had in mind:

http://www.twpinc.com/twp/jsp/product.jsp?type=4

http://www.marcospecialtysteel.com/hardwarecloth.htm

There is also expanded aluminum mesh (don't know if you already gave a
url with it.) A friend gave me a load of this stuff, he works in
demolition of buildings. The stuff was used in stuccoing buildings.
All I had to do was go to his yard and persuade the mesh out of the
stucco with a hammer.

Problems I ran into was soldering it together, soldering aluminum takes
quite a bit more skill than copper!!!

Regards,
JS

dipole coiley?
 

He might try a horizontal loop. Just run a wire around the perimeter as
high as possible, with as large an area as possible. Then feed it with open
wire line, or a short coax into the SGC tuner. At 15 feet per side, it
should be good down to 20 meters, and with some lower effectiveness at 40.


"ml" wrote in message
...
hi

wanted to help a fellow ham set up an antenna on his terrace
it's kinda a best effort attempt naturally the building won't allow
anything 'outside' so he just has the confines of the terrace


the total length of the longest side of theterrace

about 15ft on the longest side so here is my question


i was going to use a sgc 237 as the dipole 'center' and extend the legs
from there

since the total space is short would it be more advantages to make the
leggs a coil like a slinky? will this be of any real benifit?

if so how many ''turns'' and how big dia each ''coil''


my other option was to mount the sgc on the center of the celing extend
the dipole horizontally about 7ft each side then down to the floor
vertically like upside down U



i wondered how a loaded verticle would be or even using a verticle whip
into the sgc because i am not shure how i could make a 'radial'
/counterpoise

i'd like to give him at least 40m to 10 i realize that the sgc
really can 'tune ' anything but if it's too far outa wack (away from
resonance etc) it would just work poorly



he put up a glass metal framed enclousure around the terrace the metal
is isolated but a strange shape for an antenna i could try to load
that perhaps using a wire around his apt as the counterpoise? would
this be effective?


he's up about 20 stories on a high point everything elese is lower far
as eye can see to the horizon


any help is surly appreciated he's an old timer that wants to get back
on the air


ml

cloth?: dipole coiley?
 

John Smith I wrote:
Problems I ran into was soldering it together, soldering aluminum takes
quite a bit more skill than copper!!!

For some reason, the standard galvanized-dipped
stuff is easy to solder.
--
73, Cecil http://www.w5dxp.com